fix #27 : check if parsed headers and columns match

only works on 1.22
fix version quoting
2025-12-18 13:01:11 +01:00 · 2024-11-04 11:13:53 +01:00 · 2024-09-27 11:15:23 +02:00 · 2024-09-27 11:04:32 +02:00 · 2024-09-25 18:55:04 +02:00 · 2024-09-25 18:52:47 +02:00
44 changed files with 2550 additions and 517 deletions
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -0,0 +1,31 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: "[bug-report]"
+labels: bug
+assignees: TLINDEN
+
+---
+
+**Description**
+<!-- Please provide a clear and concise description of the issue: -->
+
+
+**Steps To Reproduce**
+<!-- Please detail the steps to reproduce the behavior: -->
+
+
+**Expected behavior**
+<!-- What do you expected to happen instead? -->
+
+
+**Version information**
+<!--
+Please provide as much version information as possible:
+- if you have just installed a binary, provide the output of: tablizer --version
+- if you installed from source, provide the output of: make show-version
+- provide additional details: operating system and version and shell environment
+-->
+
+
+**Additional informations**
--- a/.github/ISSUE_TEMPLATE/feature_request.md
+++ b/.github/ISSUE_TEMPLATE/feature_request.md
@@ -0,0 +1,23 @@
+---
+name: Feature request
+about: Suggest a feature
+title: "[feature-request]"
+labels: feature-request
+assignees: TLINDEN
+
+---
+
+**Description**
+<!-- Please provide a clear and concise description of the feature you desire: -->
+
+
+
+**Version information**
+<!--
+Just in case the feature is already present, please provide as
+much version information as possible:
+- if you have just installed a binary, provide the output of: tablizer --version
+- if you installed from source, provide the output of: make show-version
+- provide additional details: operating system and version and shell environment
+-->
+
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+        interval: "monthly"
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -4,19 +4,19 @@ jobs:
  build:
    strategy:
      matrix:
-        version: [1.17, 1.18, 1.19]
+        version: ['1.22']
        os: [ubuntu-latest, windows-latest, macos-latest]
    name: Build
    runs-on: ${{ matrix.os }}
    steps:
-    - name: Set up Go 1.18
-      uses: actions/setup-go@v3
+    - name: Set up Go ${{ matrix.version }}
+      uses: actions/setup-go@v5
      with:
-        go-version: ${{ matrix.version }}
+        go-version: '${{ matrix.version }}'
      id: go

    - name: checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4

    - name: build
      run: make
@@ -28,31 +28,11 @@ jobs:
    name: lint
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/setup-go@v3
+      - uses: actions/setup-go@v5
        with:
-          go-version: 1.17
-      - uses: actions/checkout@v3
+          go-version: 1.22
+      - uses: actions/checkout@v4
      - name: golangci-lint
-        uses: golangci/golangci-lint-action@v3
-        #with:
-          # Optional: version of golangci-lint to use in form of v1.2 or v1.2.3 or `latest` to use the latest version
-          # version: v1.29
-
-          # Optional: working directory, useful for monorepos
-          # working-directory: somedir
-
-          # Optional: golangci-lint command line arguments.
-          # args: --issues-exit-code=0
-
-          # Optional: show only new issues if it's a pull request. The default value is `false`.
-          # only-new-issues: true
-
-          # Optional: if set to true then the all caching functionality will be complete disabled,
-          #           takes precedence over all other caching options.
-          # skip-cache: true
-
-          # Optional: if set to true then the action don't cache or restore ~/go/pkg.
-          # skip-pkg-cache: true
-
-          # Optional: if set to true then the action don't cache or restore ~/.cache/go-build.
-          # skip-build-cache: true
+        uses: golangci/golangci-lint-action@v6
+        with:
+          skip-cache: true
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,2 @@
+releases
+tablizer
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,49 @@ All notable changes to this project will be documented in this file.

 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](http://semver.org).

+## [v1.0.14](https://github.com/TLINDEN/tablizer/tree/v1.0.14) - 2023-01-23
+
+[Full Changelog](https://github.com/TLINDEN/tablizer/compare/v1.0.13...v1.0.14)
+
+### Fixed
+
+- The -D parameter could not be used together with -a.
+
+- Fixed invalid argv handling: when the user wanted to read from stdin
+  but gave an argument which was  meant as a pattern, but also existed
+  as a filename, then tablizer opened the file, ignored stdin.
+  
+- Makefile indentation
+
+  
+### Added
+
+- added licens notes about dependencies
+
+- using hard coded uniseq version, see actions#3396457307
+
+- updated dependencies (go module versions)
+
+
+## [v1.0.13](https://github.com/TLINDEN/tablizer/tree/v1.0.13) - 2022-11-03
+
+[Full Changelog](https://github.com/TLINDEN/tablizer/compare/v1.0.12...v1.0.13)
+
+### Added
+
+- Added command line flag to generate shell completion code
+
+- Added an animated demo gif to the README to demonstrate the tool
+
+### Fixed
+
+- The `-A` flag wasn't implemented (default output mode).
+
+- Fixed building from source on systems w/o perls pod tools,
+  which is not requrired anyway since I always commit the latest
+  manpage.
+
+
 ## [v1.0.12](https://github.com/TLINDEN/tablizer/tree/v1.0.12) - 2022-10-25

 [Full Changelog](https://github.com/TLINDEN/tablizer/compare/v1.0.11...v1.0.12)
--- a/50
+++ b/50
@@ -17,24 +17,27 @@

 #
 # no need to modify anything below
-tool    = tablizer
-version = $(shell egrep "= .v" cfg/config.go | cut -d'=' -f2 | cut -d'"' -f 2)
-archs   = android darwin freebsd linux netbsd openbsd windows
-PREFIX  = /usr/local
-UID     = root
-GID     = 0
-BRANCH  = $(shell git branch --show-current)
-COMMIT  = $(shell git rev-parse --short=8 HEAD)
-BUILD   = $(shell date +%Y.%m.%d.%H%M%S) 
-VERSION:= $(if $(filter $(BRANCH), development),$(version)-$(BRANCH)-$(COMMIT)-$(BUILD),$(version))
-
+tool      = tablizer
+version   = $(shell egrep "= .v" cfg/config.go | cut -d'=' -f2 | cut -d'"' -f 2)
+archs     = android darwin freebsd linux netbsd openbsd windows
+PREFIX    = /usr/local
+UID       = root
+GID       = 0
+BRANCH    = $(shell git branch --show-current)
+COMMIT    = $(shell git rev-parse --short=8 HEAD)
+BUILD     = $(shell date +%Y.%m.%d.%H%M%S) 
+VERSION  := $(if $(filter $(BRANCH), development),$(version)-$(BRANCH)-$(COMMIT)-$(BUILD),$(version))
+HAVE_POD := $(shell pod2text -h 2>/dev/null)

 all: $(tool).1 cmd/$(tool).go buildlocal

 %.1: %.pod
+ifdef HAVE_POD
 	pod2man -c "User Commands" -r 1 -s 1 $*.pod > $*.1
+endif

 cmd/%.go: %.pod
+ifdef HAVE_POD
 	echo "package cmd" > cmd/$*.go
 	echo >> cmd/$*.go
 	echo "var manpage = \`" >> cmd/$*.go
@@ -44,6 +47,7 @@ cmd/%.go: %.pod
 	echo "var usage = \`" >> cmd/$*.go
 	awk '/SYNOPS/{f=1;next} /DESCR/{f=0} f' $*.pod  | sed 's/^    //' >> cmd/$*.go
 	echo "\`" >> cmd/$*.go
+endif

 buildlocal:
 	go build -ldflags "-X 'github.com/tlinden/tablizer/cfg.VERSION=$(VERSION)'"
@@ -63,6 +67,7 @@ clean:

 test:
 	go test -v ./...
+	bash t/test.sh

 singletest:
 	@echo "Call like this: ''make singletest TEST=TestPrepareColumns MOD=lib"
@@ -71,3 +76,26 @@ singletest:
 cover-report:
 	go test ./... -cover -coverprofile=coverage.out
 	go tool cover -html=coverage.out
+
+show-versions: buildlocal
+	@echo "### tablizer version:"
+	@./tablizer --version
+
+	@echo
+	@echo "### go module versions:"
+	@go list -m all
+
+	@echo
+	@echo "### go version used for building:"
+	@grep -m 1 go go.mod
+
+goupdate:
+	go get -t -u=patch ./...
+
+lint:
+	golangci-lint run
+
+# keep til ireturn
+lint-full:
+	golangci-lint run --enable-all --exclude-use-default --disable exhaustivestruct,exhaustruct,depguard,interfacer,deadcode,golint,structcheck,scopelint,varcheck,ifshort,maligned,nosnakecase,godot,funlen,gofumpt,cyclop,noctx,gochecknoglobals,paralleltest,forbidigo,gci,godox,goimports,ireturn,stylecheck,testpackage,mirror,nestif,revive,goerr113,gomnd
+	gocritic check -enableAll *.go
--- a/README.md
+++ b/README.md
@@ -70,13 +70,28 @@ NAME(1)                      READY(2) STATUS(3)  RESTARTS(4)    AGE(5)
 repldepl-7bcd8d5b64-q2bf4    1/1      Running    1 (69m ago)    5h26m
 ```

+Sometimes a filter regex is to broad  and you wish to filter only on a
+particular column. This is possible using `-F`:
+```
+% kubectl get pods | tablizer -n -Fname=2
+NAME                            READY   STATUS  RESTARTS        AGE
+repldepl-7bcd8d5b64-q2bf4       1/1     Running 1 (69m ago)     5h26m
+```
+
+Here we filtered  the `NAME` column for `2`, which  would have matched
+otherwise on all rows.
+
 There are more output modes like org-mode (orgtbl) and markdown.

+## Demo
+
+[![asciicast](demo/tablizer-demo.gif)](https://asciinema.org/a/9FKc3HPnlg8D2X8otheleEa9t)
+
 ## Installation

 There are multiple ways to install **tablizer**:

- Go to the [latest release page](https://github.com/muesli/mango/releases/latest),
+- Go to the [latest release page](https://github.com/tlinden/tablizer/releases/latest),
  locate the binary for your operating system and platform.
  
  Download it and put it into some directory within your `$PATH` variable.
--- a/TODO.md
+++ b/TODO.md
@@ -6,4 +6,13 @@

 - add --no-headers option

+### Lisp Plugin Infrastructure using zygo

+Hooks:
+
+| Filter    | Purpose                                                     | Args                | Return |
+|-----------|-------------------------------------------------------------|---------------------|--------|
+| filter    | include or exclude lines                                    | row as hash         | bool   |
+| process   | do calculations with data, store results in global lisp env | whole dataset       | nil    |
+| transpose | modify a cell                                               | headername and cell | cell   |
+| append    | add one or more rows to the dataset (use this to add stats) | nil                 | rows   |
--- a/cfg/config.go
+++ b/cfg/config.go
@@ -1,5 +1,5 @@
 /*
-Copyright © 2022 Thomas von Dein
+Copyright © 2022-2024 Thomas von Dein

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -19,26 +19,50 @@ package cfg
 import (
 	"errors"
 	"fmt"
-	"github.com/gookit/color"
 	"os"
 	"regexp"
+	"strings"
+
+	"github.com/glycerine/zygomys/zygo"
+	"github.com/gookit/color"
+	"github.com/hashicorp/hcl/v2/hclsimple"
 )

 const DefaultSeparator string = `(\s\s+|\t)`
-const Version string = "v1.0.12"
+const Version string = "v1.2.2"
+const MAXPARTS = 2
+
+var DefaultLoadPath = os.Getenv("HOME") + "/.config/tablizer/lisp"
+var DefaultConfigfile = os.Getenv("HOME") + "/.config/tablizer/config"

 var VERSION string // maintained by -x

+// public config, set via config file or using defaults
+type Settings struct {
+	FG             string `hcl:"FG"`
+	BG             string `hcl:"BG"`
+	HighlightFG    string `hcl:"HighlightFG"`
+	HighlightBG    string `hcl:"HighlightBG"`
+	NoHighlightFG  string `hcl:"NoHighlightFG"`
+	NoHighlightBG  string `hcl:"NoHighlightBG"`
+	HighlightHdrFG string `hcl:"HighlightHdrFG"`
+	HighlightHdrBG string `hcl:"HighlightHdrBG"`
+}
+
+// internal config
 type Config struct {
-	Debug       bool
-	NoNumbering bool
-	Columns     string
-	UseColumns  []int
-	Separator   string
-	OutputMode  int
-	InvertMatch bool
-	Pattern     string
-	PatternR    *regexp.Regexp
+	Debug          bool
+	NoNumbering    bool
+	NoHeaders      bool
+	Columns        string
+	UseColumns     []int
+	Separator      string
+	OutputMode     int
+	InvertMatch    bool
+	Pattern        string
+	PatternR       *regexp.Regexp
+	UseFuzzySearch bool
+	UseHighlight   bool

 	SortMode       string
 	SortDescending bool
@@ -48,9 +72,28 @@ type Config struct {
 	 FIXME: make configurable somehow, config file or ENV
 	 see https://github.com/gookit/color.
 	*/
-	ColorStyle color.Style
+	ColorStyle        color.Style
+	HighlightStyle    color.Style
+	NoHighlightStyle  color.Style
+	HighlightHdrStyle color.Style

 	NoColor bool
+
+	// special  case: we use the  config struct to transport  the lisp
+	// env trough the program
+	Lisp *zygo.Zlisp
+
+	// a path containing lisp scripts to be loaded on startup
+	LispLoadPath string
+
+	// config file, optional
+	Configfile string
+
+	Settings Settings
+
+	// used for field filtering
+	Rawfilters []string
+	Filters    map[string]*regexp.Regexp
 }

 // maps outputmode short flags to output mode, ie. -O => -o orgtbl
@@ -72,7 +115,7 @@ const (
 	Shell
 	Yaml
 	CSV
-	Ascii
+	ASCII
 )

 // various sort types
@@ -82,50 +125,108 @@ type Sortmode struct {
 	Age     bool
 }

+// valid lisp hooks
+var ValidHooks []string
+
 // default color schemes
-func Colors() map[color.Level]map[string]color.Color {
-	return map[color.Level]map[string]color.Color{
+func (conf *Config) Colors() map[color.Level]map[string]color.Color {
+	colors := map[color.Level]map[string]color.Color{
 		color.Level16: {
-			"bg": color.BgGreen, "fg": color.FgBlack,
+			"bg": color.BgGreen, "fg": color.FgWhite,
+			"hlbg": color.BgGray, "hlfg": color.FgWhite,
 		},
 		color.Level256: {
-			"bg": color.BgLightGreen, "fg": color.FgBlack,
+			"bg": color.BgLightGreen, "fg": color.FgWhite,
+			"hlbg": color.BgLightBlue, "hlfg": color.FgWhite,
 		},
 		color.LevelRgb: {
-			// FIXME: maybe use something nicer
-			"bg": color.BgLightGreen, "fg": color.FgBlack,
+			"bg": color.BgLightGreen, "fg": color.FgWhite,
+			"hlbg": color.BgHiGreen, "hlfg": color.FgWhite,
+			"nohlbg": color.BgWhite, "nohlfg": color.FgLightGreen,
+			"hdrbg": color.BgBlue, "hdrfg": color.FgWhite,
 		},
 	}
+
+	if len(conf.Settings.BG) > 0 {
+		colors[color.Level16]["bg"] = ColorStringToBGColor(conf.Settings.BG)
+		colors[color.Level256]["bg"] = ColorStringToBGColor(conf.Settings.BG)
+		colors[color.LevelRgb]["bg"] = ColorStringToBGColor(conf.Settings.BG)
+	}
+
+	if len(conf.Settings.FG) > 0 {
+		colors[color.Level16]["fg"] = ColorStringToColor(conf.Settings.FG)
+		colors[color.Level256]["fg"] = ColorStringToColor(conf.Settings.FG)
+		colors[color.LevelRgb]["fg"] = ColorStringToColor(conf.Settings.FG)
+	}
+
+	if len(conf.Settings.HighlightBG) > 0 {
+		colors[color.Level16]["hlbg"] = ColorStringToBGColor(conf.Settings.HighlightBG)
+		colors[color.Level256]["hlbg"] = ColorStringToBGColor(conf.Settings.HighlightBG)
+		colors[color.LevelRgb]["hlbg"] = ColorStringToBGColor(conf.Settings.HighlightBG)
+	}
+
+	if len(conf.Settings.HighlightFG) > 0 {
+		colors[color.Level16]["hlfg"] = ColorStringToColor(conf.Settings.HighlightFG)
+		colors[color.Level256]["hlfg"] = ColorStringToColor(conf.Settings.HighlightFG)
+		colors[color.LevelRgb]["hlfg"] = ColorStringToColor(conf.Settings.HighlightFG)
+	}
+
+	if len(conf.Settings.NoHighlightBG) > 0 {
+		colors[color.Level16]["nohlbg"] = ColorStringToBGColor(conf.Settings.NoHighlightBG)
+		colors[color.Level256]["nohlbg"] = ColorStringToBGColor(conf.Settings.NoHighlightBG)
+		colors[color.LevelRgb]["nohlbg"] = ColorStringToBGColor(conf.Settings.NoHighlightBG)
+	}
+
+	if len(conf.Settings.NoHighlightFG) > 0 {
+		colors[color.Level16]["nohlfg"] = ColorStringToColor(conf.Settings.NoHighlightFG)
+		colors[color.Level256]["nohlfg"] = ColorStringToColor(conf.Settings.NoHighlightFG)
+		colors[color.LevelRgb]["nohlfg"] = ColorStringToColor(conf.Settings.NoHighlightFG)
+	}
+
+	if len(conf.Settings.HighlightHdrBG) > 0 {
+		colors[color.Level16]["hdrbg"] = ColorStringToBGColor(conf.Settings.HighlightHdrBG)
+		colors[color.Level256]["hdrbg"] = ColorStringToBGColor(conf.Settings.HighlightHdrBG)
+		colors[color.LevelRgb]["hdrbg"] = ColorStringToBGColor(conf.Settings.HighlightHdrBG)
+	}
+
+	if len(conf.Settings.HighlightHdrFG) > 0 {
+		colors[color.Level16]["hdrfg"] = ColorStringToColor(conf.Settings.HighlightHdrFG)
+		colors[color.Level256]["hdrfg"] = ColorStringToColor(conf.Settings.HighlightHdrFG)
+		colors[color.LevelRgb]["hdrfg"] = ColorStringToColor(conf.Settings.HighlightHdrFG)
+	}
+
+	return colors
 }

 // find supported color mode, modifies config based on constants
-func (c *Config) DetermineColormode() {
+func (conf *Config) DetermineColormode() {
 	if !isTerminal(os.Stdout) {
 		color.Disable()
 	} else {
 		level := color.TermColorLevel()
-		colors := Colors()
-		c.ColorStyle = color.New(colors[level]["bg"], colors[level]["fg"])
+		colors := conf.Colors()
+
+		conf.ColorStyle = color.New(colors[level]["bg"], colors[level]["fg"])
+		conf.HighlightStyle = color.New(colors[level]["hlbg"], colors[level]["hlfg"])
+		conf.NoHighlightStyle = color.New(colors[level]["nohlbg"], colors[level]["nohlfg"])
+		conf.HighlightHdrStyle = color.New(colors[level]["hdrbg"], colors[level]["hdrfg"])
 	}
 }

 // Return true if current terminal is interactive
 func isTerminal(f *os.File) bool {
 	o, _ := f.Stat()
-	if (o.Mode() & os.ModeCharDevice) == os.ModeCharDevice {
-		return true
-	} else {
-		return false
-	}
+
+	return (o.Mode() & os.ModeCharDevice) == os.ModeCharDevice
 }

+// main program version
+// generated  version string, used  by -v contains  lib.Version on
+//
+//	main branch, and lib.Version-$branch-$lastcommit-$date on
+//
+// development branch
 func Getversion() string {
-	// main program version
-
-	// generated  version string, used  by -v contains  lib.Version on
-	//  main  branch,   and  lib.Version-$branch-$lastcommit-$date  on
-	// development branch
-
 	return fmt.Sprintf("This is tablizer version %s", VERSION)
 }

@@ -157,44 +258,129 @@ func (conf *Config) PrepareModeFlags(flag Modeflag) {
 	case flag.C:
 		conf.OutputMode = CSV
 	default:
-		conf.OutputMode = Ascii
+		conf.OutputMode = ASCII
 	}
 }

-func (c *Config) CheckEnv() {
-	// check for environment vars, command line flags have precedence,
-	// NO_COLOR is being checked by the color module itself.
-	if !c.NoNumbering {
-		_, set := os.LookupEnv("T_NO_HEADER_NUMBERING")
-		if set {
-			c.NoNumbering = true
+func (conf *Config) PrepareFilters() error {
+	conf.Filters = make(map[string]*regexp.Regexp, len(conf.Rawfilters))
+
+	for _, filter := range conf.Rawfilters {
+		parts := strings.Split(filter, "=")
+		if len(parts) != MAXPARTS {
+			return errors.New("filter field and value must be separated by =")
 		}
-	}

-	if len(c.Columns) == 0 {
-		cols := os.Getenv("T_COLUMNS")
-		if len(cols) > 1 {
-			c.Columns = cols
+		reg, err := regexp.Compile(parts[1])
+		if err != nil {
+			return fmt.Errorf("failed to compile filter regex for field %s: %w",
+				parts[0], err)
 		}
+
+		conf.Filters[strings.ToLower(parts[0])] = reg
 	}
-}
-
-func (c *Config) ApplyDefaults() {
-	// mode specific defaults
-	if c.OutputMode == Yaml || c.OutputMode == CSV {
-		c.NoNumbering = true
-	}
-}
-
-func (c *Config) PreparePattern(pattern string) error {
-	PatternR, err := regexp.Compile(pattern)
-
-	if err != nil {
-		return errors.Unwrap(fmt.Errorf("Regexp pattern %s is invalid: %w", c.Pattern, err))
-	}
-
-	c.PatternR = PatternR
-	c.Pattern = pattern

 	return nil
 }
+
+func (conf *Config) CheckEnv() {
+	// check for environment vars, command line flags have precedence,
+	// NO_COLOR is being checked by the color module itself.
+	if !conf.NoNumbering {
+		_, set := os.LookupEnv("T_NO_HEADER_NUMBERING")
+		if set {
+			conf.NoNumbering = true
+		}
+	}
+
+	if len(conf.Columns) == 0 {
+		cols := os.Getenv("T_COLUMNS")
+		if len(cols) > 1 {
+			conf.Columns = cols
+		}
+	}
+}
+
+func (conf *Config) ApplyDefaults() {
+	// mode specific defaults
+	if conf.OutputMode == Yaml || conf.OutputMode == CSV {
+		conf.NoNumbering = true
+	}
+
+	ValidHooks = []string{"filter", "process", "transpose", "append"}
+}
+
+func (conf *Config) PreparePattern(pattern string) error {
+	PatternR, err := regexp.Compile(pattern)
+
+	if err != nil {
+		return fmt.Errorf("regexp pattern %s is invalid: %w", conf.Pattern, err)
+	}
+
+	conf.PatternR = PatternR
+	conf.Pattern = pattern
+
+	return nil
+}
+
+// Parse config file.  Ignore if the file doesn't exist  but return an
+// error if it exists but fails to read or parse
+func (conf *Config) ParseConfigfile() error {
+	path, err := os.Stat(conf.Configfile)
+
+	if os.IsNotExist(err) || path.IsDir() {
+		// ignore non-existent or dirs
+		return nil
+	}
+
+	configstring, err := os.ReadFile(path.Name())
+	if err != nil {
+		return fmt.Errorf("failed to read config file %s: %w", path.Name(), err)
+	}
+
+	err = hclsimple.Decode(
+		path.Name(),
+		configstring,
+		nil,
+		&conf.Settings)
+	if err != nil {
+		return fmt.Errorf("failed to load configuration file %s: %w",
+			path.Name(), err)
+	}
+
+	return nil
+}
+
+// translate color string to internal color value
+func ColorStringToColor(colorname string) color.Color {
+	for name, color := range color.FgColors {
+		if name == colorname {
+			return color
+		}
+	}
+
+	for name, color := range color.ExFgColors {
+		if name == colorname {
+			return color
+		}
+	}
+
+	return color.Normal
+}
+
+// same, for background colors
+func ColorStringToBGColor(colorname string) color.Color {
+	for name, color := range color.BgColors {
+		if name == colorname {
+			return color
+		}
+	}
+
+	for name, color := range color.ExBgColors {
+		if name == colorname {
+			return color
+		}
+	}
+
+	return color.Normal
+}
--- a/cfg/config_test.go
+++ b/cfg/config_test.go
@@ -34,18 +34,18 @@ func TestPrepareModeFlags(t *testing.T) {
 		{Modeflag{O: true}, Orgtbl},
 		{Modeflag{Y: true}, Yaml},
 		{Modeflag{M: true}, Markdown},
-		{Modeflag{}, Ascii},
+		{Modeflag{}, ASCII},
 	}

 	// FIXME: use a map for easier printing
-	for _, tt := range tests {
-		testname := fmt.Sprintf("PrepareModeFlags-expect-%d", tt.expect)
+	for _, testdata := range tests {
+		testname := fmt.Sprintf("PrepareModeFlags-expect-%d", testdata.expect)
 		t.Run(testname, func(t *testing.T) {
-			c := Config{}
+			conf := Config{}

-			c.PrepareModeFlags(tt.flag)
-			if c.OutputMode != tt.expect {
-				t.Errorf("got: %d, expect: %d", c.OutputMode, tt.expect)
+			conf.PrepareModeFlags(testdata.flag)
+			if conf.OutputMode != testdata.expect {
+				t.Errorf("got: %d, expect: %d", conf.OutputMode, testdata.expect)
 			}
 		})
 	}
@@ -63,15 +63,15 @@ func TestPrepareSortFlags(t *testing.T) {
 		{Sortmode{}, "string"},
 	}

-	for _, tt := range tests {
-		testname := fmt.Sprintf("PrepareSortFlags-expect-%s", tt.expect)
+	for _, testdata := range tests {
+		testname := fmt.Sprintf("PrepareSortFlags-expect-%s", testdata.expect)
 		t.Run(testname, func(t *testing.T) {
-			c := Config{}
+			conf := Config{}

-			c.PrepareSortFlags(tt.flag)
+			conf.PrepareSortFlags(testdata.flag)

-			if c.SortMode != tt.expect {
-				t.Errorf("got: %s, expect: %s", c.SortMode, tt.expect)
+			if conf.SortMode != testdata.expect {
+				t.Errorf("got: %s, expect: %s", conf.SortMode, testdata.expect)
 			}
 		})
 	}
@@ -86,15 +86,16 @@ func TestPreparePattern(t *testing.T) {
 		{"[a-z", true},
 	}

-	for _, tt := range tests {
-		testname := fmt.Sprintf("PreparePattern-pattern-%s-wanterr-%t", tt.pattern, tt.wanterr)
+	for _, testdata := range tests {
+		testname := fmt.Sprintf("PreparePattern-pattern-%s-wanterr-%t",
+			testdata.pattern, testdata.wanterr)
 		t.Run(testname, func(t *testing.T) {
-			c := Config{}
+			conf := Config{}

-			err := c.PreparePattern(tt.pattern)
+			err := conf.PreparePattern(testdata.pattern)

 			if err != nil {
-				if !tt.wanterr {
+				if !testdata.wanterr {
 					t.Errorf("PreparePattern returned error: %s", err)
 				}
 			}
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -1,5 +1,5 @@
 /*
-Copyright © 2022 Thomas von Dein
+Copyright © 2022-2024 Thomas von Dein

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -18,24 +18,27 @@ package cmd

 import (
 	"bytes"
+	"errors"
 	"fmt"
-	"github.com/spf13/cobra"
-	"github.com/tlinden/tablizer/cfg"
-	"github.com/tlinden/tablizer/lib"
 	"log"
 	"os"
 	"os/exec"
 	"strings"
+
+	"github.com/spf13/cobra"
+	"github.com/tlinden/tablizer/cfg"
+	"github.com/tlinden/tablizer/lib"
 )

 func man() {
 	man := exec.Command("less", "-")

-	var b bytes.Buffer
-	b.Write([]byte(manpage))
+	var buffer bytes.Buffer
+
+	buffer.Write([]byte(manpage))

 	man.Stdout = os.Stdout
-	man.Stdin = &b
+	man.Stdin = &buffer
 	man.Stderr = os.Stderr

 	err := man.Run()
@@ -45,70 +48,153 @@ func man() {
 	}
 }

+func completion(cmd *cobra.Command, mode string) error {
+	switch mode {
+	case "bash":
+		return cmd.Root().GenBashCompletion(os.Stdout)
+	case "zsh":
+		return cmd.Root().GenZshCompletion(os.Stdout)
+	case "fish":
+		return cmd.Root().GenFishCompletion(os.Stdout, true)
+	case "powershell":
+		return cmd.Root().GenPowerShellCompletionWithDesc(os.Stdout)
+	default:
+		return errors.New("invalid shell parameter! Valid ones: bash|zsh|fish|powershell")
+	}
+}
+
+// we die with exit 1 if there's an error
+func wrapE(err error) {
+	if err != nil {
+		fmt.Println(err.Error())
+		os.Exit(1)
+	}
+}
+
 func Execute() {
 	var (
-		conf        cfg.Config
-		ShowManual  bool
-		ShowVersion bool
-		modeflag    cfg.Modeflag
-		sortmode    cfg.Sortmode
+		conf           cfg.Config
+		ShowManual     bool
+		ShowVersion    bool
+		ShowCompletion string
+		modeflag       cfg.Modeflag
+		sortmode       cfg.Sortmode
 	)

 	var rootCmd = &cobra.Command{
 		Use:   "tablizer [regex] [file, ...]",
 		Short: "[Re-]tabularize tabular data",
 		Long:  `Manipulate tabular output of other programs`,
-		RunE: func(cmd *cobra.Command, args []string) error {
+
+		Run: func(cmd *cobra.Command, args []string) {
 			if ShowVersion {
 				fmt.Println(cfg.Getversion())
-				return nil
+
+				return
 			}

 			if ShowManual {
 				man()
-				return nil
+
+				return
+			}
+
+			if len(ShowCompletion) > 0 {
+				wrapE(completion(cmd, ShowCompletion))
+
+				return
 			}

 			// Setup
+			wrapE(conf.ParseConfigfile())
+
 			conf.CheckEnv()
 			conf.PrepareModeFlags(modeflag)
 			conf.PrepareSortFlags(sortmode)
+
+			wrapE(conf.PrepareFilters())
+
 			conf.DetermineColormode()
 			conf.ApplyDefaults()

+			// setup lisp env, load plugins etc
+			wrapE(lib.SetupLisp(&conf))
+
 			// actual execution starts here
-			return lib.ProcessFiles(&conf, args)
+			wrapE(lib.ProcessFiles(&conf, args))
 		},
 	}

 	// options
-	rootCmd.PersistentFlags().BoolVarP(&conf.Debug, "debug", "d", false, "Enable debugging")
-	rootCmd.PersistentFlags().BoolVarP(&conf.NoNumbering, "no-numbering", "n", false, "Disable header numbering")
-	rootCmd.PersistentFlags().BoolVarP(&conf.NoColor, "no-color", "N", false, "Disable pattern highlighting")
-	rootCmd.PersistentFlags().BoolVarP(&ShowVersion, "version", "V", false, "Print program version")
-	rootCmd.PersistentFlags().BoolVarP(&conf.InvertMatch, "invert-match", "v", false, "select non-matching rows")
-	rootCmd.PersistentFlags().BoolVarP(&ShowManual, "man", "m", false, "Display manual page")
-	rootCmd.PersistentFlags().StringVarP(&conf.Separator, "separator", "s", cfg.DefaultSeparator, "Custom field separator")
-	rootCmd.PersistentFlags().StringVarP(&conf.Columns, "columns", "c", "", "Only show the speficied columns (separated by ,)")
+	rootCmd.PersistentFlags().BoolVarP(&conf.Debug, "debug", "d", false,
+		"Enable debugging")
+	rootCmd.PersistentFlags().BoolVarP(&conf.NoNumbering, "no-numbering", "n", false,
+		"Disable header numbering")
+	rootCmd.PersistentFlags().BoolVarP(&conf.NoHeaders, "no-headers", "H", false,
+		"Disable header display")
+	rootCmd.PersistentFlags().BoolVarP(&conf.NoColor, "no-color", "N", false,
+		"Disable pattern highlighting")
+	rootCmd.PersistentFlags().BoolVarP(&ShowVersion, "version", "V", false,
+		"Print program version")
+	rootCmd.PersistentFlags().BoolVarP(&conf.InvertMatch, "invert-match", "v", false,
+		"select non-matching rows")
+	rootCmd.PersistentFlags().BoolVarP(&ShowManual, "man", "m", false,
+		"Display manual page")
+	rootCmd.PersistentFlags().BoolVarP(&conf.UseFuzzySearch, "fuzzy", "z", false,
+		"Use fuzzy searching")
+	rootCmd.PersistentFlags().BoolVarP(&conf.UseHighlight, "highlight-lines", "L", false,
+		"Use alternating background colors")
+	rootCmd.PersistentFlags().StringVarP(&ShowCompletion, "completion", "", "",
+		"Display completion code")
+	rootCmd.PersistentFlags().StringVarP(&conf.Separator, "separator", "s", cfg.DefaultSeparator,
+		"Custom field separator")
+	rootCmd.PersistentFlags().StringVarP(&conf.Columns, "columns", "c", "",
+		"Only show the speficied columns (separated by ,)")

 	// sort options
-	rootCmd.PersistentFlags().IntVarP(&conf.SortByColumn, "sort-by", "k", 0, "Sort by column (default: 1)")
+	rootCmd.PersistentFlags().IntVarP(&conf.SortByColumn, "sort-by", "k", 0,
+		"Sort by column (default: 1)")

 	// sort mode, only 1 allowed
-	rootCmd.PersistentFlags().BoolVarP(&conf.SortDescending, "sort-desc", "D", false, "Sort in descending order (default: ascending)")
-	rootCmd.PersistentFlags().BoolVarP(&sortmode.Numeric, "sort-numeric", "i", false, "sort according to string numerical value")
-	rootCmd.PersistentFlags().BoolVarP(&sortmode.Time, "sort-time", "t", false, "sort according to time string")
-	rootCmd.PersistentFlags().BoolVarP(&sortmode.Age, "sort-age", "a", false, "sort according to age (duration) string")
-	rootCmd.MarkFlagsMutuallyExclusive("sort-desc", "sort-numeric", "sort-time", "sort-age")
+	rootCmd.PersistentFlags().BoolVarP(&conf.SortDescending, "sort-desc", "D", false,
+		"Sort in descending order (default: ascending)")
+	rootCmd.PersistentFlags().BoolVarP(&sortmode.Numeric, "sort-numeric", "i", false,
+		"sort according to string numerical value")
+	rootCmd.PersistentFlags().BoolVarP(&sortmode.Time, "sort-time", "t", false,
+		"sort according to time string")
+	rootCmd.PersistentFlags().BoolVarP(&sortmode.Age, "sort-age", "a", false,
+		"sort according to age (duration) string")
+	rootCmd.MarkFlagsMutuallyExclusive("sort-numeric", "sort-time",
+		"sort-age")

 	// output flags, only 1 allowed
-	rootCmd.PersistentFlags().BoolVarP(&modeflag.X, "extended", "X", false, "Enable extended output")
-	rootCmd.PersistentFlags().BoolVarP(&modeflag.M, "markdown", "M", false, "Enable markdown table output")
-	rootCmd.PersistentFlags().BoolVarP(&modeflag.O, "orgtbl", "O", false, "Enable org-mode table output")
-	rootCmd.PersistentFlags().BoolVarP(&modeflag.S, "shell", "S", false, "Enable shell mode output")
-	rootCmd.PersistentFlags().BoolVarP(&modeflag.Y, "yaml", "Y", false, "Enable yaml output")
-	rootCmd.PersistentFlags().BoolVarP(&modeflag.C, "csv", "C", false, "Enable CSV output")
-	rootCmd.MarkFlagsMutuallyExclusive("extended", "markdown", "orgtbl", "shell", "yaml", "csv")
+	rootCmd.PersistentFlags().BoolVarP(&modeflag.X, "extended", "X", false,
+		"Enable extended output")
+	rootCmd.PersistentFlags().BoolVarP(&modeflag.M, "markdown", "M", false,
+		"Enable markdown table output")
+	rootCmd.PersistentFlags().BoolVarP(&modeflag.O, "orgtbl", "O", false,
+		"Enable org-mode table output")
+	rootCmd.PersistentFlags().BoolVarP(&modeflag.S, "shell", "S", false,
+		"Enable shell mode output")
+	rootCmd.PersistentFlags().BoolVarP(&modeflag.Y, "yaml", "Y", false,
+		"Enable yaml output")
+	rootCmd.PersistentFlags().BoolVarP(&modeflag.C, "csv", "C", false,
+		"Enable CSV output")
+	rootCmd.PersistentFlags().BoolVarP(&modeflag.A, "ascii", "A", false,
+		"Enable ASCII output (default)")
+	rootCmd.MarkFlagsMutuallyExclusive("extended", "markdown", "orgtbl",
+		"shell", "yaml", "csv")
+
+	// lisp options
+	rootCmd.PersistentFlags().StringVarP(&conf.LispLoadPath, "load-path", "l", cfg.DefaultLoadPath,
+		"Load path for lisp plugins (expects *.zy files)")
+
+	// config file
+	rootCmd.PersistentFlags().StringVarP(&conf.Configfile, "config", "f", cfg.DefaultConfigfile,
+		"config file (default: ~/.config/tablizer/config)")
+
+	// filters
+	rootCmd.PersistentFlags().StringArrayVarP(&conf.Rawfilters, "filter", "F", nil, "Filter by field (field=regexp)")

 	rootCmd.SetUsageTemplate(strings.TrimSpace(usage) + "\n")

--- a/cmd/tablizer.go
+++ b/cmd/tablizer.go
@@ -13,17 +13,21 @@ SYNOPSIS
          -v, --invert-match       select non-matching rows
          -n, --no-numbering       Disable header numbering
          -N, --no-color           Disable pattern highlighting
+          -H, --no-headers         Disable headers display
          -s, --separator string   Custom field separator
          -k, --sort-by int        Sort by column (default: 1)
+          -z, --fuzzy              Use fuzzy search [experimental]
+          -F, --filter field=reg   Filter given field with regex, can be used multiple times

        Output Flags (mutually exclusive):
          -X, --extended           Enable extended output
          -M, --markdown           Enable markdown table output
          -O, --orgtbl             Enable org-mode table output
-          -S, --shell              Enable shell evaluable ouput
+          -S, --shell              Enable shell evaluable output
          -Y, --yaml               Enable yaml output
          -C, --csv                Enable CSV output
          -A, --ascii              Default output mode, ascii tabular
+          -L, --hightlight-lines   Use alternating background colors for tables

        Sort Mode Flags (mutually exclusive):
          -a, --sort-age           sort according to age (duration) string
@@ -32,10 +36,12 @@ SYNOPSIS
          -t, --sort-time          sort according to time string

        Other Flags:
+              --completion <shell> Generate the autocompletion script for <shell>
+          -f, --config <file>      Configuration file (default: ~/.config/tablizer/config)
          -d, --debug              Enable debugging
          -h, --help               help for tablizer
          -m, --man                Display manual page
-          -v, --version            Print program version
+          -V, --version            Print program version

 DESCRIPTION
    Many programs generate tabular output. But sometimes you need to
@@ -86,6 +92,11 @@ DESCRIPTION

    The numbering can be suppressed by using the -n option.

+    By default tablizer shows a header containing the names of each column.
+    This can be disabled using the -H option. Be aware that this only
+    affects tabular output modes. Shell, Extended, Yaml and CSV output modes
+    always use the column names.
+
    By default, if a pattern has been speficied, matches will be
    highlighted. You can disable this behavior with the -N option.

@@ -107,7 +118,7 @@ DESCRIPTION
    Finally the -d option enables debugging output which is mostly useful
    for the developer.

-  PATTERNS
+  PATTERNS AND FILTERING
    You can reduce the rows being displayed by using a regular expression
    pattern. The regexp is PCRE compatible, refer to the syntax cheat sheet
    here: <https://github.com/google/re2/wiki/Syntax>. If you want to read a
@@ -131,6 +142,23 @@ DESCRIPTION

        kubectl get pods -A | tablizer "(?i)account"

+    You can use the experimental fuzzy search feature by providing the
+    option -z, in which case the pattern is regarded as a fuzzy search term,
+    not a regexp.
+
+    Sometimes you want to filter by one or more columns. You can do that
+    using the -F option. The option can be specified multiple times and has
+    the following format:
+
+        fieldname=regexp
+
+    Fieldnames (== columns headers) are case insensitive.
+
+    If you specify more than one filter, both filters have to match (AND
+    operation).
+
+    If the option -v is specified, the filtering is inverted.
+
  COLUMNS
    The parameter -c can be used to specify, which columns to display. By
    default tablizer numerizes the header names and these numbers can be
@@ -199,6 +227,82 @@ DESCRIPTION
    <T_COLUMNS> - comma separated list of columns to output, like -c
    <NO_COLORS> - disable colorization of matches, like -N

+  COMPLETION
+    Shell completion for command line options can be enabled by using the
+    --completion flag. The required parameter is the name of your shell.
+    Currently supported are: bash, zsh, fish and powershell.
+
+    Detailed instructions:
+
+    Bash:
+           source <(tablizer --completion bash)
+
+        To load completions for each session, execute once:
+
+          # Linux:
+          $ tablizer --completion bash > /etc/bash_completion.d/tablizer
+
+          # macOS:
+          $ tablizer --completion bash > $(brew --prefix)/etc/bash_completion.d/tablizer
+
+    Zsh:
+        If shell completion is not already enabled in your environment, you
+        will need to enable it. You can execute the following once:
+
+          echo "autoload -U compinit; compinit" >> ~/.zshrc
+
+        To load completions for each session, execute once:
+
+          $ tablizer --completion zsh > "${fpath[1]}/_tablizer"
+
+        You will need to start a new shell for this setup to take effect.
+
+    fish:
+           tablizer --completion fish | source
+
+        To load completions for each session, execute once:
+
+           tablizer --completion fish > ~/.config/fish/completions/tablizer.fish
+
+    PowerShell:
+           tablizer --completion powershell | Out-String | Invoke-Expression
+
+        To load completions for every new session, run:
+
+           tablizer --completion powershell > tablizer.ps1
+
+        and source this file from your PowerShell profile.
+
+CONFIGURATION AND COLORS
+    YOu can put certain configuration values into a configuration file in
+    HCL format. By default tablizer looks for
+    "$HOME/.config/tablizer/config", but you can provide one using the
+    parameter "-f".
+
+    In the configuration the following variables can be defined:
+
+        BG             = "lightGreen"
+        FG             = "white"
+        HighlightBG    = "lightGreen"
+        HighlightFG    = "white"
+        NoHighlightBG  = "white"
+        NoHighlightFG  = "lightGreen"
+        HighlightHdrBG = "red"
+        HighlightHdrFG = "white"
+
+    The following color definitions are available:
+
+    black, blue, cyan, darkGray, default, green, lightBlue, lightCyan,
+    lightGreen, lightMagenta, lightRed, lightWhite, lightYellow, magenta,
+    red, white, yellow
+
+    The Variables FG and BG are being used to highlight matches. The other
+    *FG and *BG variables are for colored table output (enabled with the
+    "-L" parameter).
+
+    Colorization can be turned off completely either by setting the
+    parameter "-N" or the environment variable NO_COLOR to a true value.
+
 BUGS
    In order to report a bug, unexpected behavior, feature requests or to
    submit a patch, please open an issue on github:
@@ -208,9 +312,9 @@ LICENSE
    This software is licensed under the GNU GENERAL PUBLIC LICENSE version
    3.

-    Copyright (c) 2022 by Thomas von Dein
+    Copyright (c) 2022-2024 by Thomas von Dein

-    This software uses the following GO libraries:
+    This software uses the following GO modules:

    repr (https://github.com/alecthomas/repr)
        Released under the MIT License, Copyright (c) 2016 Alec Thomas
@@ -219,6 +323,19 @@ LICENSE
        Released under the Apache 2.0 license, Copyright 2013-2022 The Cobra
        Authors

+    dateparse (github.com/araddon/dateparse)
+        Released under the MIT License, Copyright (c) 2015-2017 Aaron Raddon
+
+    color (github.com/gookit/color)
+        Released under the MIT License, Copyright (c) 2016 inhere
+
+    tablewriter (github.com/olekukonko/tablewriter)
+        Released under the MIT License, Copyright (c) 201 by Oleku Konko
+
+    yaml (gopkg.in/yaml.v3)
+        Released under the MIT License, Copyright (c) 2006-2011 Kirill
+        Simonov
+
 AUTHORS
    Thomas von Dein tom AT vondein DOT org

@@ -233,17 +350,21 @@ Operational Flags:
  -v, --invert-match       select non-matching rows
  -n, --no-numbering       Disable header numbering
  -N, --no-color           Disable pattern highlighting
+  -H, --no-headers         Disable headers display
  -s, --separator string   Custom field separator
  -k, --sort-by int        Sort by column (default: 1)
+  -z, --fuzzy              Use fuzzy search [experimental]
+  -F, --filter field=reg   Filter given field with regex, can be used multiple times

 Output Flags (mutually exclusive):
  -X, --extended           Enable extended output
  -M, --markdown           Enable markdown table output
  -O, --orgtbl             Enable org-mode table output
-  -S, --shell              Enable shell evaluable ouput
+  -S, --shell              Enable shell evaluable output
  -Y, --yaml               Enable yaml output
  -C, --csv                Enable CSV output
  -A, --ascii              Default output mode, ascii tabular
+  -L, --hightlight-lines   Use alternating background colors for tables

 Sort Mode Flags (mutually exclusive):
  -a, --sort-age           sort according to age (duration) string
@@ -252,10 +373,12 @@ Sort Mode Flags (mutually exclusive):
  -t, --sort-time          sort according to time string

 Other Flags:
+      --completion <shell> Generate the autocompletion script for <shell>
+  -f, --config <file>      Configuration file (default: ~/.config/tablizer/config)
  -d, --debug              Enable debugging
  -h, --help               help for tablizer
  -m, --man                Display manual page
-  -v, --version            Print program version
+  -V, --version            Print program version


 `
--- a/config.hcl
+++ b/config.hcl
@@ -0,0 +1,12 @@
+# supported  colors:
+# black, blue,  cyan, darkGray, default, green,  lightBlue, lightCyan,
+# lightGreen,   lightMagenta,   lightRed,   lightWhite,   lightYellow,
+# magenta, red, white, yellow
+BG             = "lightGreen"
+FG             = "white"
+HighlightBG    = "lightGreen"
+HighlightFG    = "white"
+NoHighlightBG  = "white"
+NoHighlightFG  = "lightGreen"
+HighlightHdrBG = "red"
+HighlightHdrFG = "white"
--- a/demo/Makefile
+++ b/demo/Makefile
@@ -0,0 +1,3 @@
+all:
+	LC_ALL=en_US.UTF-8 asciinema rec --cols 50 --row 30 -c ./demo.sh --overwrite tmp.cast
+	agg tmp.cast tmp.gif
--- a/demo/demo.sh
+++ b/demo/demo.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+
+prompt() {
+    if test -n "$1"; then
+        echo
+        echo -n "% $*"
+        sleep 1
+        echo
+        $*
+        echo
+        echo -n "% "
+    else
+        echo -n "% "
+    fi
+}
+
+PATH=..:$PATH
+clear
+while IFS=$'\t' read -r flags table msg source _; do
+    echo "#"
+    echo "#   source tabular data:"
+    cat $table
+    echo
+    echo "#"
+    echo "#   $msg:"
+    prompt "tablizer $flags $table"
+  
+    sleep 4
+    clear
+done < <(yq -r tables.yaml \
+         | yq -r '.tables[] | [.flags, .table, .msg, .source] | @tsv')
--- a/demo/table.demo1
+++ b/demo/table.demo1
@@ -0,0 +1,4 @@
+NAME   DURATION   COUNT  WHEN
+beta   1d10h5m1s  33     3/1/2014
+alpha  4h35m      170    2013-Feb-03
+ceta   33d12h     9      06/Jan/2008 15:04:05 -0700
--- a/demo/table.demo2
+++ b/demo/table.demo2
@@ -0,0 +1,3 @@
+    PID TTY          TIME CMD
+  30912 pts/0    00:00:00 bash
+  49526 pts/0    00:00:00 ps
--- a/demo/tables.yaml
+++ b/demo/tables.yaml
@@ -0,0 +1,54 @@
+tables:
+# OUTPUTS
+  - flags: -A
+    table: table.demo1
+    msg: default output mode
+  - flags: -O
+    table: table.demo1
+    msg: orgmode output mode
+  - flags: -M
+    table: table.demo1
+    msg: markdown output mode
+  - flags: -S
+    table: table.demo1
+    msg: shell output mode
+  - flags: -X
+    table: table.demo1
+    msg: extended output mode
+  - flags: -Y
+    table: table.demo1
+    msg: yaml output mode
+  - flags: -C
+    table: table.demo1
+    msg: CSV output mode
+
+  # SORTS
+  - flags: -A -k 3
+    table: table.demo1
+    msg: sort by column 3
+  - flags: -A -k 4 -t
+    table: table.demo1
+    msg: sort by column 4 and sort type time
+  - flags: -A -k 2 -a
+    table: table.demo1
+    msg: sort by column 2 and sort type duration
+
+  # REDUCE
+  - flags: -A -c 1,3
+    table: table.demo1
+    msg: only display column 1 and 3
+  - flags: -A -c AM,RA
+    table: table.demo1
+    msg: only display columns matching /(RA|AM)/
+  - flags: -X -c 1,3
+    table: table.demo1
+    msg: only display column 1 and 3 in extended mode
+
+  # SEARCH
+  - flags: /20 -A
+    table: table.demo1
+    msg: only show rows matching /20
+  - flags: /20 -A -v
+    table: table.demo1
+    msg: only show rows NOT matching /20
+
--- a/demo/tablizer-demo.cast
+++ b/demo/tablizer-demo.cast
@@ -0,0 +1,119 @@
+{"version": 2, "width": 80, "height": 25, "timestamp": 1666890777, "env": {"SHELL": "/bin/bash", "TERM": "xterm-256color"}}
+[0.004618, "o", "\u001b[H\u001b[2J\u001b[3J"]
+[0.010297, "o", "#\r\n#   source tabular data:\r\n"]
+[0.010898, "o", "NAME   DURATION   COUNT  WHEN\r\nbeta   1d10h5m1s  33     3/1/2014\r\nalpha  4h35m      170    2013-Feb-03\r\nceta   33d12h     9      06/Jan/2008 15:04:05 -0700\r\n"]
+[0.011125, "o", "\r\n#\r\n"]
+[0.011177, "o", "#   default output mode:\r\n"]
+[0.011219, "o", "\r\n% tablizer -A table.demo1"]
+[1.011851, "o", "\r\n"]
+[1.013635, "o", "NAME(1)\tDURATION(2)\tCOUNT(3)\tWHEN(4)                    \r\nbeta   \t1d10h5m1s  \t33      \t3/1/2014                  \t\r\nalpha  \t4h35m      \t170     \t2013-Feb-03               \t\r\nceta   \t33d12h     \t9       \t06/Jan/2008 15:04:05 -0700\t\r\n"]
+[1.014021, "o", "\r\n% "]
+[5.015241, "o", "\u001b[H\u001b[2J\u001b[3J"]
+[5.015339, "o", "#\r\n#   source tabular data:\r\n"]
+[5.015688, "o", "NAME   DURATION   COUNT  WHEN\r\nbeta   1d10h5m1s  33     3/1/2014\r\nalpha  4h35m      170    2013-Feb-03\r\nceta   33d12h     9      06/Jan/2008 15:04:05 -0700\r\n"]
+[5.015776, "o", "\r\n#\r\n#   orgmode output mode:\r\n\r\n% tablizer -O table.demo1"]
+[6.016322, "o", "\r\n"]
+[6.01823, "o", "+---------+-------------+----------+----------------------------+\r\n| NAME(1) | DURATION(2) | COUNT(3) |          WHEN(4)           |\r\n+---------+-------------+----------+----------------------------+\r\n| beta    | 1d10h5m1s   |       33 | 3/1/2014                   |\r\n| alpha   | 4h35m       |      170 | 2013-Feb-03                |\r\n| ceta    | 33d12h      |        9 | 06/Jan/2008 15:04:05 -0700 |\r\n+---------+-------------+----------+----------------------------+\r\n"]
+[6.018497, "o", "\r\n% "]
+[10.020014, "o", "\u001b[H\u001b[2J\u001b[3J"]
+[10.020112, "o", "#\r\n#   source tabular data:\r\n"]
+[10.020573, "o", "NAME   DURATION   COUNT  WHEN\r\nbeta   1d10h5m1s  33     3/1/2014\r\nalpha  4h35m      170    2013-Feb-03\r\nceta   33d12h     9      06/Jan/2008 15:04:05 -0700\r\n"]
+[10.020643, "o", "\r\n#\r\n"]
+[10.02068, "o", "#   markdown output mode:\r\n\r\n% tablizer -M table.demo1"]
+[11.021559, "o", "\r\n"]
+[11.023551, "o", "| NAME(1) | DURATION(2) | COUNT(3) |          WHEN(4)           |\r\n|---------|-------------|----------|----------------------------|\r\n| beta    | 1d10h5m1s   |       33 | 3/1/2014                   |\r\n| alpha   | 4h35m       |      170 | 2013-Feb-03                |\r\n| ceta    | 33d12h      |        9 | 06/Jan/2008 15:04:05 -0700 |\r\n"]
+[11.023838, "o", "\r\n% "]
+[15.025244, "o", "\u001b[H\u001b[2J\u001b[3J"]
+[15.025345, "o", "#\r\n#   source tabular data:\r\n"]
+[15.025829, "o", "NAME   DURATION   COUNT  WHEN\r\nbeta   1d10h5m1s  33     3/1/2014\r\nalpha  4h35m      170    2013-Feb-03\r\nceta   33d12h     9      06/Jan/2008 15:04:05 -0700\r\n"]
+[15.025915, "o", "\r\n#\r\n#   shell output mode:\r\n"]
+[15.025931, "o", "\r\n"]
+[15.025948, "o", "% tablizer -S table.demo1"]
+[16.026714, "o", "\r\n"]
+[16.028606, "o", "NAME(1)=\"beta\" DURATION(2)=\"1d10h5m1s\" COUNT(3)=\"33\" WHEN(4)=\"3/1/2014\"\r\nNAME(1)=\"alpha\" DURATION(2)=\"4h35m\" COUNT(3)=\"170\" WHEN(4)=\"2013-Feb-03\"\r\nNAME(1)=\"ceta\" DURATION(2)=\"33d12h\" COUNT(3)=\"9\" WHEN(4)=\"06/Jan/2008 15:04:05 -0700\"\r\n"]
+[16.029144, "o", "\r\n% "]
+[20.030593, "o", "\u001b[H\u001b[2J\u001b[3J"]
+[20.030706, "o", "#\r\n#   source tabular data:\r\n"]
+[20.03121, "o", "NAME   DURATION   COUNT  WHEN\r\nbeta   1d10h5m1s  33     3/1/2014\r\nalpha  4h35m      170    2013-Feb-03\r\nceta   33d12h     9      06/Jan/2008 15:04:05 -0700\r\n"]
+[20.031277, "o", "\r\n#\r\n#   extended output mode:\r\n"]
+[20.031327, "o", "\r\n% tablizer -X table.demo1"]
+[21.032053, "o", "\r\n"]
+[21.033787, "o", "    NAME(1): beta\r\nDURATION(2): 1d10h5m1s\r\n   COUNT(3): 33\r\n    WHEN(4): 3/1/2014\r\n\r\n    NAME(1): alpha\r\nDURATION(2): 4h35m\r\n   COUNT(3): 170\r\n    WHEN(4): 2013-Feb-03\r\n\r\n    NAME(1): ceta\r\nDURATION(2): 33d12h\r\n   COUNT(3): 9\r\n    WHEN(4): 06/Jan/2008 15:04:05 -0700\r\n\r\n"]
+[21.034132, "o", "\r\n% "]
+[25.035531, "o", "\u001b[H\u001b[2J\u001b[3J"]
+[25.035585, "o", "#\r\n"]
+[25.035681, "o", "#   source tabular data:\r\n"]
+[25.036179, "o", "NAME   DURATION   COUNT  WHEN\r\nbeta   1d10h5m1s  33     3/1/2014\r\nalpha  4h35m      170    2013-Feb-03\r\nceta   33d12h     9      06/Jan/2008 15:04:05 -0700\r\n"]
+[25.036232, "o", "\r\n#\r\n"]
+[25.036274, "o", "#   yaml output mode:\r\n\r\n% tablizer -Y table.demo1"]
+[26.036928, "o", "\r\n"]
+[26.038674, "o", "entries:\r\n    - count: 33\r\n      duration: \"1d10h5m1s\"\r\n      name: \"beta\"\r\n      when: \"3/1/2014\"\r\n    - count: 170\r\n      duration: \"4h35m\"\r\n      name: \"alpha\"\r\n      when: \"2013-Feb-03\"\r\n    - count: 9\r\n      duration: \"33d12h\"\r\n      name: \"ceta\"\r\n      when: \"06/Jan/2008 15:04:05 -0700\"\r\n"]
+[26.038975, "o", "\r\n% "]
+[30.040539, "o", "\u001b[H\u001b[2J\u001b[3J"]
+[30.040659, "o", "#\r\n#   source tabular data:\r\n"]
+[30.041167, "o", "NAME   DURATION   COUNT  WHEN\r\nbeta   1d10h5m1s  33     3/1/2014\r\nalpha  4h35m      170    2013-Feb-03\r\nceta   33d12h     9      06/Jan/2008 15:04:05 -0700\r\n"]
+[30.041246, "o", "\r\n#\r\n#   CSV output mode:\r\n\r\n% tablizer -C table.demo1"]
+[31.042088, "o", "\r\n"]
+[31.043721, "o", "NAME,DURATION,COUNT,WHEN\r\nbeta,1d10h5m1s,33,3/1/2014\r\nalpha,4h35m,170,2013-Feb-03\r\nceta,33d12h,9,06/Jan/2008 15:04:05 -0700\r\n"]
+[31.043997, "o", "\r\n% "]
+[35.045523, "o", "\u001b[H\u001b[2J\u001b[3J"]
+[35.04563, "o", "#\r\n#   source tabular data:\r\n"]
+[35.046209, "o", "NAME   DURATION   COUNT  WHEN\r\nbeta   1d10h5m1s  33     3/1/2014\r\nalpha  4h35m      170    2013-Feb-03\r\nceta   33d12h     9      06/Jan/2008 15:04:05 -0700\r\n"]
+[35.046275, "o", "\r\n#\r\n#   sort by column 3:\r\n\r\n% tablizer -A -k 3 table.demo1"]
+[36.047083, "o", "\r\n"]
+[36.048793, "o", "NAME(1)\tDURATION(2)\tCOUNT(3)\tWHEN(4)                    \r\nalpha  \t4h35m      \t170     \t2013-Feb-03               \t\r\nbeta   \t1d10h5m1s  \t33      \t3/1/2014                  \t\r\nceta   \t33d12h     \t9       \t06/Jan/2008 15:04:05 -0700\t\r\n"]
+[36.049077, "o", "\r\n% "]
+[40.050739, "o", "\u001b[H\u001b[2J\u001b[3J"]
+[40.050925, "o", "#\r\n#   source tabular data:\r\n"]
+[40.051481, "o", "NAME   DURATION   COUNT  WHEN\r\nbeta   1d10h5m1s  33     3/1/2014\r\nalpha  4h35m      170    2013-Feb-03\r\nceta   33d12h     9      06/Jan/2008 15:04:05 -0700\r\n"]
+[40.051671, "o", "\r\n#\r\n#   sort by column 4 and sort type time:\r\n\r\n% tablizer -A -k 4 -t table.demo1"]
+[41.052486, "o", "\r\n"]
+[41.05454, "o", "NAME(1)\tDURATION(2)\tCOUNT(3)\tWHEN(4)                    \r\nceta   \t33d12h     \t9       \t06/Jan/2008 15:04:05 -0700\t\r\nalpha  \t4h35m      \t170     \t2013-Feb-03               \t\r\nbeta   \t1d10h5m1s  \t33      \t3/1/2014                  \t\r\n"]
+[41.054864, "o", "\r\n% "]
+[45.056297, "o", "\u001b[H\u001b[2J\u001b[3J"]
+[45.056405, "o", "#\r\n#   source tabular data:\r\n"]
+[45.056895, "o", "NAME   DURATION   COUNT  WHEN\r\nbeta   1d10h5m1s  33     3/1/2014\r\nalpha  4h35m      170    2013-Feb-03\r\nceta   33d12h     9      06/Jan/2008 15:04:05 -0700\r\n"]
+[45.056978, "o", "\r\n#\r\n"]
+[45.057023, "o", "#   sort by column 2 and sort type duration:\r\n"]
+[45.057073, "o", "\r\n% tablizer -A -k 2 -a table.demo1"]
+[46.057895, "o", "\r\n"]
+[46.059684, "o", "NAME(1)\tDURATION(2)\tCOUNT(3)\tWHEN(4)                    \r\nalpha  \t4h35m      \t170     \t2013-Feb-03               \t\r\nbeta   \t1d10h5m1s  \t33      \t3/1/2014                  \t\r\nceta   \t33d12h     \t9       \t06/Jan/2008 15:04:05 -0700\t\r\n"]
+[46.059988, "o", "\r\n% "]
+[50.061514, "o", "\u001b[H\u001b[2J\u001b[3J"]
+[50.061622, "o", "#\r\n#   source tabular data:\r\n"]
+[50.062091, "o", "NAME   DURATION   COUNT  WHEN\r\nbeta   1d10h5m1s  33     3/1/2014\r\nalpha  4h35m      170    2013-Feb-03\r\nceta   33d12h     9      06/Jan/2008 15:04:05 -0700\r\n"]
+[50.062188, "o", "\r\n#\r\n#   only display column 1 and 3:\r\n\r\n% tablizer -A -c 1,3 table.demo1"]
+[51.062985, "o", "\r\n"]
+[51.066293, "o", "NAME(1)\tCOUNT(3) \r\nbeta   \t33      \t\r\nalpha  \t170     \t\r\nceta   \t9       \t\r\n"]
+[51.066843, "o", "\r\n% "]
+[55.070781, "o", "\u001b[H\u001b[2J\u001b[3J"]
+[55.071327, "o", "#\r\n#   source tabular data:\r\n"]
+[55.073499, "o", "NAME   DURATION   COUNT  WHEN\r\nbeta   1d10h5m1s  33     3/1/2014\r\nalpha  4h35m      170    2013-Feb-03\r\nceta   33d12h     9      06/Jan/2008 15:04:05 -0700\r\n"]
+[55.073822, "o", "\r\n#\r\n#   only display columns matching /(RA|AM)/:\r\n"]
+[55.074188, "o", "\r\n% tablizer -A -c AM,RA table.demo1"]
+[56.07636, "o", "\r\n"]
+[56.078603, "o", "NAME(1)\tDURATION(2) \r\nbeta   \t1d10h5m1s  \t\r\nalpha  \t4h35m      \t\r\nceta   \t33d12h     \t\r\n"]
+[56.078957, "o", "\r\n% "]
+[60.080574, "o", "\u001b[H\u001b[2J\u001b[3J"]
+[60.080734, "o", "#\r\n#   source tabular data:\r\n"]
+[60.081286, "o", "NAME   DURATION   COUNT  WHEN\r\nbeta   1d10h5m1s  33     3/1/2014\r\nalpha  4h35m      170    2013-Feb-03\r\nceta   33d12h     9      06/Jan/2008 15:04:05 -0700\r\n"]
+[60.081418, "o", "\r\n#\r\n#   only display column 1 and 3 in extended mode:\r\n\r\n% tablizer -X -c 1,3 table.demo1"]
+[61.082844, "o", "\r\n"]
+[61.089822, "o", " NAME(1): beta\r\nCOUNT(3): 33\r\n\r\n NAME(1): alpha\r\nCOUNT(3): 170\r\n\r\n NAME(1): ceta\r\nCOUNT(3): 9\r\n\r\n"]
+[61.090969, "o", "\r\n% "]
+[65.096092, "o", "\u001b[H\u001b[2J\u001b[3J"]
+[65.096571, "o", "#\r\n#   source tabular data:\r\n"]
+[65.098736, "o", "NAME   DURATION   COUNT  WHEN\r\nbeta   1d10h5m1s  33     3/1/2014\r\nalpha  4h35m      170    2013-Feb-03\r\nceta   33d12h     9      06/Jan/2008 15:04:05 -0700\r\n"]
+[65.099085, "o", "\r\n#\r\n#   only show rows matching /20:\r\n"]
+[65.099283, "o", "\r\n% tablizer /20 -A table.demo1"]
+[66.101537, "o", "\r\n"]
+[66.109112, "o", "NAME(1)\tDURATION(2)\tCOUNT(3)\tWHEN(4)                    \r\nbeta   \t1d10h5m1s  \t33      \t3/1\u001b[102;30m/20\u001b[0m14                  \t\r\nceta   \t33d12h     \t9       \t06/Jan\u001b[102;30m/20\u001b[0m08 15:04:05 -0700\t\r\n"]
+[66.109405, "o", "\r\n% "]
+[70.11076, "o", "\u001b[H\u001b[2J\u001b[3J"]
+[70.110873, "o", "#\r\n#   source tabular data:\r\n"]
+[70.111365, "o", "NAME   DURATION   COUNT  WHEN\r\nbeta   1d10h5m1s  33     3/1/2014\r\nalpha  4h35m      170    2013-Feb-03\r\nceta   33d12h     9      06/Jan/2008 15:04:05 -0700\r\n"]
+[70.111469, "o", "\r\n#\r\n#   only show rows NOT matching /20:\r\n\r\n% tablizer /20 -A -v table.demo1"]
+[71.112738, "o", "\r\n"]
+[71.120032, "o", "NAME(1)\tDURATION(2)\tCOUNT(3)\tWHEN(4)     \r\nalpha  \t4h35m      \t170     \t2013-Feb-03\t\r\n"]
+[71.121127, "o", "\r\n% "]
+[75.126199, "o", "\u001b[H\u001b[2J\u001b[3J"]
--- a/demo/tablizer-demo.gif
+++ b/demo/tablizer-demo.gif
--- a/go.mod
+++ b/go.mod
@@ -1,21 +1,44 @@
 module github.com/tlinden/tablizer

-go 1.18
+go 1.22

 require (
-	github.com/alecthomas/repr v0.0.0-20180818092828-117648cd9897
+	github.com/alecthomas/repr v0.4.0
 	github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de
-	github.com/gookit/color v1.5.2
+	github.com/glycerine/zygomys v5.1.2+incompatible
+	github.com/gookit/color v1.5.4
+	github.com/hashicorp/hcl/v2 v2.22.0
+	github.com/lithammer/fuzzysearch v1.1.8
 	github.com/olekukonko/tablewriter v0.0.5
-	github.com/spf13/cobra v1.5.0
+	github.com/spf13/cobra v1.8.1
 	gopkg.in/yaml.v3 v3.0.1
 )

 require (
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/agext/levenshtein v1.2.1 // indirect
+	github.com/apparentlymart/go-textseg/v13 v13.0.0 // indirect
+	github.com/apparentlymart/go-textseg/v15 v15.0.0 // indirect
+	github.com/glycerine/blake2b v0.0.0-20151022103502-3c8c640cd7be // indirect
+	github.com/glycerine/goconvey v0.0.0-20190410193231-58a59202ab31 // indirect
+	github.com/glycerine/greenpack v5.1.1+incompatible // indirect
+	github.com/glycerine/liner v0.0.0-20160121172638-72909af234e0 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/gopherjs/gopherjs v1.17.2 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/jtolds/gls v4.20.0+incompatible // indirect
 	github.com/mattn/go-runewidth v0.0.10 // indirect
+	github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7 // indirect
+	github.com/philhofer/fwd v1.1.2 // indirect
 	github.com/rivo/uniseg v0.1.0 // indirect
+	github.com/shurcooL/go v0.0.0-20200502201357-93f07166e636 // indirect
+	github.com/shurcooL/go-goon v1.0.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/tinylib/msgp v1.1.9 // indirect
+	github.com/ugorji/go/codec v1.2.11 // indirect
 	github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778 // indirect
-	golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44 // indirect
+	github.com/zclconf/go-cty v1.13.0 // indirect
+	golang.org/x/mod v0.13.0 // indirect
+	golang.org/x/sys v0.13.0 // indirect
+	golang.org/x/text v0.11.0 // indirect
+	golang.org/x/tools v0.14.0 // indirect
 )
--- a/go.sum
+++ b/go.sum
@@ -1,43 +1,118 @@
-github.com/alecthomas/repr v0.0.0-20180818092828-117648cd9897 h1:p9Sln00KOTlrYkxI1zYWl1QLnEqAqEARBEYa8FQnQcY=
-github.com/alecthomas/repr v0.0.0-20180818092828-117648cd9897/go.mod h1:xTS7Pm1pD1mvyM075QCDSRqH6qRLXylzS24ZTpRiSzQ=
+github.com/agext/levenshtein v1.2.1 h1:QmvMAjj2aEICytGiWzmxoE0x2KZvE0fvmqMOfy2tjT8=
+github.com/agext/levenshtein v1.2.1/go.mod h1:JEDfjyjHDjOF/1e4FlBE/PkbqA9OfWu2ki2W0IB5558=
+github.com/alecthomas/repr v0.4.0 h1:GhI2A8MACjfegCPVq9f1FLvIBS+DrQ2KQBFZP1iFzXc=
+github.com/alecthomas/repr v0.4.0/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
+github.com/apparentlymart/go-textseg/v13 v13.0.0 h1:Y+KvPE1NYz0xl601PVImeQfFyEy6iT90AvPUL1NNfNw=
+github.com/apparentlymart/go-textseg/v13 v13.0.0/go.mod h1:ZK2fH7c4NqDTLtiYLvIkEghdlcqw7yxLeM89kiTRPUo=
+github.com/apparentlymart/go-textseg/v15 v15.0.0 h1:uYvfpb3DyLSCGWnctWKGj857c6ew1u1fNQOlOtuGxQY=
+github.com/apparentlymart/go-textseg/v15 v15.0.0/go.mod h1:K8XmNZdhEBkdlyDdvbmmsvpAG721bKi0joRfFdHIWJ4=
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--- a/lib/common.go
+++ b/lib/common.go
@@ -1,5 +1,5 @@
 /*
-Copyright © 2022 Thomas von Dein
+Copyright © 2022-2024 Thomas von Dein

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -24,3 +24,13 @@ type Tabdata struct {
 	headers        []string // [ "ID", "NAME", ...]
 	entries        [][]string
 }
+
+func (data *Tabdata) CloneEmpty() Tabdata {
+	newdata := Tabdata{
+		maxwidthHeader: data.maxwidthHeader,
+		columns:        data.columns,
+		headers:        data.headers,
+	}
+
+	return newdata
+}
--- a/lib/filter.go
+++ b/lib/filter.go
@@ -0,0 +1,130 @@
+/*
+Copyright © 2022-2024 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package lib
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"strings"
+
+	"github.com/lithammer/fuzzysearch/fuzzy"
+	"github.com/tlinden/tablizer/cfg"
+)
+
+/*
+ * [!]Match a  line, use fuzzy  search for normal pattern  strings and
+ * regexp otherwise.
+ */
+func matchPattern(conf cfg.Config, line string) bool {
+	if conf.UseFuzzySearch {
+		return fuzzy.MatchFold(conf.Pattern, line)
+	}
+
+	return conf.PatternR.MatchString(line)
+}
+
+/*
+ * Filter parsed data by fields. The  filter is positive, so if one or
+ * more filters match on a row, it  will be kept, otherwise it will be
+ * excluded.
+ */
+func FilterByFields(conf cfg.Config, data Tabdata) (Tabdata, bool, error) {
+	if len(conf.Filters) == 0 {
+		// no filters, no checking
+		return Tabdata{}, false, nil
+	}
+
+	newdata := data.CloneEmpty()
+
+	for _, row := range data.entries {
+		keep := true
+
+		for idx, header := range data.headers {
+			if !Exists(conf.Filters, strings.ToLower(header)) {
+				// do not filter by unspecified field
+				continue
+			}
+
+			if !conf.Filters[strings.ToLower(header)].MatchString(row[idx]) {
+				// there IS a filter, but it doesn't match
+				keep = false
+
+				break
+			}
+		}
+
+		if keep == !conf.InvertMatch {
+			// also apply -v
+			newdata.entries = append(newdata.entries, row)
+		}
+	}
+
+	return newdata, true, nil
+}
+
+/* generic map.Exists(key) */
+func Exists[K comparable, V any](m map[K]V, v K) bool {
+	if _, ok := m[v]; ok {
+		return true
+	}
+
+	return false
+}
+
+func FilterByPattern(conf cfg.Config, input io.Reader) (io.Reader, error) {
+	if conf.Pattern == "" {
+		return input, nil
+	}
+
+	scanner := bufio.NewScanner(input)
+	lines := []string{}
+	hadFirst := false
+
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if hadFirst {
+			// don't match 1st line, it's the header
+			if conf.Pattern != "" && matchPattern(conf, line) == conf.InvertMatch {
+				// by default  -v is false, so if a  line does NOT
+				// match the pattern, we will ignore it. However,
+				// if the user specified -v, the matching is inverted,
+				// so we ignore all lines, which DO match.
+				continue
+			}
+
+			// apply user defined lisp filters, if any
+			accept, err := RunFilterHooks(conf, line)
+			if err != nil {
+				return input, fmt.Errorf("failed to apply filter hook: %w", err)
+			}
+
+			if !accept {
+				//  IF there  are filter  hook[s] and  IF one  of them
+				// returns false on the current line, reject it
+				continue
+			}
+		}
+
+		lines = append(lines, line)
+
+		hadFirst = true
+	}
+
+	return strings.NewReader(strings.Join(lines, "\n")), nil
+}
--- a/lib/filter_test.go
+++ b/lib/filter_test.go
@@ -0,0 +1,162 @@
+/*
+Copyright © 2024 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package lib
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+
+	"github.com/tlinden/tablizer/cfg"
+)
+
+func TestMatchPattern(t *testing.T) {
+	var input = []struct {
+		name    string
+		fuzzy   bool
+		pattern string
+		line    string
+	}{
+		{
+			name:    "normal",
+			pattern: "haus",
+			line:    "hausparty",
+		},
+		{
+			name:    "fuzzy",
+			pattern: "hpt",
+			line:    "haus-party-termin",
+			fuzzy:   true,
+		},
+	}
+
+	for _, inputdata := range input {
+		testname := fmt.Sprintf("match-pattern-%s", inputdata.name)
+
+		t.Run(testname, func(t *testing.T) {
+			conf := cfg.Config{}
+
+			if inputdata.fuzzy {
+				conf.UseFuzzySearch = true
+			}
+
+			err := conf.PreparePattern(inputdata.pattern)
+			if err != nil {
+				t.Errorf("PreparePattern returned error: %s", err)
+			}
+
+			if !matchPattern(conf, inputdata.line) {
+				t.Errorf("matchPattern() did not match\nExp: true\nGot: false\n")
+			}
+		})
+	}
+}
+
+func TestFilterByFields(t *testing.T) {
+	data := Tabdata{
+		headers: []string{
+			"ONE", "TWO", "THREE",
+		},
+		entries: [][]string{
+			{"asd", "igig", "cxxxncnc"},
+			{"19191", "EDD 1", "x"},
+			{"8d8", "AN 1", "y"},
+		},
+	}
+
+	var input = []struct {
+		name   string
+		filter []string
+		expect Tabdata
+		invert bool
+	}{
+		{
+			name:   "one-field",
+			filter: []string{"one=19"},
+			expect: Tabdata{
+				headers: []string{
+					"ONE", "TWO", "THREE",
+				},
+				entries: [][]string{
+					{"19191", "EDD 1", "x"},
+				},
+			},
+		},
+
+		{
+			name:   "one-field-inverted",
+			filter: []string{"one=19"},
+			invert: true,
+			expect: Tabdata{
+				headers: []string{
+					"ONE", "TWO", "THREE",
+				},
+				entries: [][]string{
+					{"asd", "igig", "cxxxncnc"},
+					{"8d8", "AN 1", "y"},
+				},
+			},
+		},
+
+		{
+			name:   "many-fields",
+			filter: []string{"one=19", "two=DD"},
+			expect: Tabdata{
+				headers: []string{
+					"ONE", "TWO", "THREE",
+				},
+				entries: [][]string{
+					{"19191", "EDD 1", "x"},
+				},
+			},
+		},
+
+		{
+			name:   "many-fields-inverted",
+			filter: []string{"one=19", "two=DD"},
+			invert: true,
+			expect: Tabdata{
+				headers: []string{
+					"ONE", "TWO", "THREE",
+				},
+				entries: [][]string{
+					{"asd", "igig", "cxxxncnc"},
+					{"8d8", "AN 1", "y"},
+				},
+			},
+		},
+	}
+
+	for _, inputdata := range input {
+		testname := fmt.Sprintf("filter-by-fields-%s", inputdata.name)
+
+		t.Run(testname, func(t *testing.T) {
+			conf := cfg.Config{Rawfilters: inputdata.filter, InvertMatch: inputdata.invert}
+
+			err := conf.PrepareFilters()
+			if err != nil {
+				t.Errorf("PrepareFilters returned error: %s", err)
+			}
+
+			data, _, _ := FilterByFields(conf, data)
+			if !reflect.DeepEqual(data, inputdata.expect) {
+				t.Errorf("Filtered data does not match expected data:\ngot: %+v\nexp: %+v", data, inputdata.expect)
+			}
+		})
+	}
+}
--- a/lib/helpers.go
+++ b/lib/helpers.go
@@ -20,13 +20,14 @@ package lib
 import (
 	"errors"
 	"fmt"
-	"github.com/gookit/color"
-	"github.com/tlinden/tablizer/cfg"
 	"os"
 	"regexp"
 	"sort"
 	"strconv"
 	"strings"
+
+	"github.com/gookit/color"
+	"github.com/tlinden/tablizer/cfg"
 )

 func contains(s []int, e int) bool {
@@ -35,79 +36,101 @@ func contains(s []int, e int) bool {
 			return true
 		}
 	}
+
 	return false
 }

+// validate the consitency of parsed data
+func ValidateConsistency(data *Tabdata) error {
+	expectedfields := len(data.headers)
+
+	for idx, row := range data.entries {
+		if len(row) != expectedfields {
+			return fmt.Errorf("row %d does not contain expected %d elements, but %d",
+				idx, expectedfields, len(row))
+		}
+	}
+
+	return nil
+}
+
 // parse columns list given  with -c, modifies config.UseColumns based
 // on eventually given regex
-func PrepareColumns(c *cfg.Config, data *Tabdata) error {
-	if len(c.Columns) > 0 {
-		for _, use := range strings.Split(c.Columns, ",") {
-			if len(use) == 0 {
-				msg := fmt.Sprintf("Could not parse columns list %s: empty column", c.Columns)
+func PrepareColumns(conf *cfg.Config, data *Tabdata) error {
+	if conf.Columns == "" {
+		return nil
+	}
+
+	for _, use := range strings.Split(conf.Columns, ",") {
+		if len(use) == 0 {
+			return fmt.Errorf("could not parse columns list %s: empty column", conf.Columns)
+		}
+
+		usenum, err := strconv.Atoi(use)
+		if err != nil {
+			// might be a regexp
+			colPattern, err := regexp.Compile(use)
+			if err != nil {
+				msg := fmt.Sprintf("Could not parse columns list %s: %v", conf.Columns, err)
+
 				return errors.New(msg)
 			}

-			usenum, err := strconv.Atoi(use)
-			if err != nil {
-				// might be a regexp
-				colPattern, err := regexp.Compile(use)
-				if err != nil {
-					msg := fmt.Sprintf("Could not parse columns list %s: %v", c.Columns, err)
-					return errors.New(msg)
+			// find matching header fields
+			for i, head := range data.headers {
+				if colPattern.MatchString(head) {
+					conf.UseColumns = append(conf.UseColumns, i+1)
 				}
-
-				// find matching header fields
-				for i, head := range data.headers {
-					if colPattern.MatchString(head) {
-						c.UseColumns = append(c.UseColumns, i+1)
-					}
-
-				}
-			} else {
-				// we digress from go  best practises here, because if
-				// a colum spec is not a number, we process them above
-				// inside the err handler  for atoi(). so only add the
-				// number, if it's really just a number.
-				c.UseColumns = append(c.UseColumns, usenum)
 			}
+		} else {
+			// we digress from go  best practises here, because if
+			// a colum spec is not a number, we process them above
+			// inside the err handler  for atoi(). so only add the
+			// number, if it's really just a number.
+			conf.UseColumns = append(conf.UseColumns, usenum)
 		}
-
-		// deduplicate: put all values into a map (value gets map key)
-		// thereby  removing duplicates,  extract keys into  new slice
-		// and sort it
-		imap := make(map[int]int, len(c.UseColumns))
-		for _, i := range c.UseColumns {
-			imap[i] = 0
-		}
-		c.UseColumns = nil
-		for k := range imap {
-			c.UseColumns = append(c.UseColumns, k)
-		}
-		sort.Ints(c.UseColumns)
 	}
+
+	// deduplicate: put all values into a map (value gets map key)
+	// thereby  removing duplicates,  extract keys into  new slice
+	// and sort it
+	imap := make(map[int]int, len(conf.UseColumns))
+	for _, i := range conf.UseColumns {
+		imap[i] = 0
+	}
+
+	conf.UseColumns = nil
+
+	for k := range imap {
+		conf.UseColumns = append(conf.UseColumns, k)
+	}
+
+	sort.Ints(conf.UseColumns)
+
 	return nil
 }

 // prepare headers: add numbers to headers
-func numberizeAndReduceHeaders(c cfg.Config, data *Tabdata) {
+func numberizeAndReduceHeaders(conf cfg.Config, data *Tabdata) {
 	numberedHeaders := []string{}
 	maxwidth := 0 // start from scratch, so we only look at displayed column widths

-	for i, head := range data.headers {
-		headlen := 0
-		if len(c.Columns) > 0 {
+	for idx, head := range data.headers {
+		var headlen int
+
+		if len(conf.Columns) > 0 {
 			// -c specified
-			if !contains(c.UseColumns, i+1) {
+			if !contains(conf.UseColumns, idx+1) {
 				// ignore this one
 				continue
 			}
 		}
-		if c.NoNumbering {
+
+		if conf.NoNumbering {
 			numberedHeaders = append(numberedHeaders, head)
 			headlen = len(head)
 		} else {
-			numhead := fmt.Sprintf("%s(%d)", head, i+1)
+			numhead := fmt.Sprintf("%s(%d)", head, idx+1)
 			headlen = len(numhead)
 			numberedHeaders = append(numberedHeaders, numhead)
 		}
@@ -116,49 +139,94 @@ func numberizeAndReduceHeaders(c cfg.Config, data *Tabdata) {
 			maxwidth = headlen
 		}
 	}
+
 	data.headers = numberedHeaders
+
 	if data.maxwidthHeader != maxwidth && maxwidth > 0 {
 		data.maxwidthHeader = maxwidth
 	}
 }

 // exclude columns, if any
-func reduceColumns(c cfg.Config, data *Tabdata) {
-	if len(c.Columns) > 0 {
+func reduceColumns(conf cfg.Config, data *Tabdata) {
+	if len(conf.Columns) > 0 {
 		reducedEntries := [][]string{}
+
 		var reducedEntry []string
+
 		for _, entry := range data.entries {
 			reducedEntry = nil
+
 			for i, value := range entry {
-				if !contains(c.UseColumns, i+1) {
+				if !contains(conf.UseColumns, i+1) {
 					continue
 				}

 				reducedEntry = append(reducedEntry, value)
 			}
+
 			reducedEntries = append(reducedEntries, reducedEntry)
 		}
+
 		data.entries = reducedEntries
 	}
 }

+// FIXME: remove this when we only use Tablewriter and strip in ParseFile()!
 func trimRow(row []string) []string {
-	// FIXME: remove this when we only use Tablewriter and strip in ParseFile()!
-	var fixedrow []string
-	for _, cell := range row {
-		fixedrow = append(fixedrow, strings.TrimSpace(cell))
+	var fixedrow = make([]string, len(row))
+
+	for idx, cell := range row {
+		fixedrow[idx] = strings.TrimSpace(cell)
 	}

 	return fixedrow
 }

-func colorizeData(c cfg.Config, output string) string {
-	if len(c.Pattern) > 0 && !c.NoColor && color.IsConsole(os.Stdout) {
-		r := regexp.MustCompile("(" + c.Pattern + ")")
+// FIXME: refactor this beast!
+func colorizeData(conf cfg.Config, output string) string {
+	switch {
+	case conf.UseHighlight && color.IsConsole(os.Stdout):
+		highlight := true
+		colorized := ""
+		first := true
+
+		for _, line := range strings.Split(output, "\n") {
+			if highlight {
+				if first {
+					// we  need to add  two spaces to the  header line
+					//  because tablewriter omits them for some reason
+					//  in pprint mode. This doesn't matter as long as
+					//  we don't use colorization. But with colors the
+					// missing spaces can be seen.
+					if conf.OutputMode == cfg.ASCII {
+						line += "  "
+					}
+
+					line = conf.HighlightHdrStyle.Sprint(line)
+					first = false
+				} else {
+					line = conf.HighlightStyle.Sprint(line)
+				}
+			} else {
+				line = conf.NoHighlightStyle.Sprint(line)
+			}
+
+			highlight = !highlight
+
+			colorized += line + "\n"
+		}
+
+		return colorized
+
+	case len(conf.Pattern) > 0 && !conf.NoColor && color.IsConsole(os.Stdout):
+		r := regexp.MustCompile("(" + conf.Pattern + ")")
+
 		return r.ReplaceAllStringFunc(output, func(in string) string {
-			return c.ColorStyle.Sprint(in)
+			return conf.ColorStyle.Sprint(in)
 		})
-	} else {
+
+	default:
 		return output
 	}
 }
--- a/lib/helpers_test.go
+++ b/lib/helpers_test.go
@@ -19,9 +19,10 @@ package lib

 import (
 	"fmt"
-	"github.com/tlinden/tablizer/cfg"
 	"reflect"
 	"testing"
+
+	"github.com/tlinden/tablizer/cfg"
 )

 func TestContains(t *testing.T) {
@@ -71,18 +72,18 @@ func TestPrepareColumns(t *testing.T) {
 		{"[a-z,4,5", []int{4, 5}, true}, // invalid regexp
 	}

-	for _, tt := range tests {
-		testname := fmt.Sprintf("PrepareColumns-%s-%t", tt.input, tt.wanterror)
+	for _, testdata := range tests {
+		testname := fmt.Sprintf("PrepareColumns-%s-%t", testdata.input, testdata.wanterror)
 		t.Run(testname, func(t *testing.T) {
-			c := cfg.Config{Columns: tt.input}
-			err := PrepareColumns(&c, &data)
+			conf := cfg.Config{Columns: testdata.input}
+			err := PrepareColumns(&conf, &data)
 			if err != nil {
-				if !tt.wanterror {
+				if !testdata.wanterror {
 					t.Errorf("got error: %v", err)
 				}
 			} else {
-				if !reflect.DeepEqual(c.UseColumns, tt.exp) {
-					t.Errorf("got: %v, expected: %v", c.UseColumns, tt.exp)
+				if !reflect.DeepEqual(conf.UseColumns, testdata.exp) {
+					t.Errorf("got: %v, expected: %v", conf.UseColumns, testdata.exp)
 				}
 			}
 		})
@@ -114,14 +115,16 @@ func TestReduceColumns(t *testing.T) {

 	input := [][]string{{"a", "b", "c"}}

-	for _, tt := range tests {
-		testname := fmt.Sprintf("reduce-columns-by-%+v", tt.columns)
+	for _, testdata := range tests {
+		testname := fmt.Sprintf("reduce-columns-by-%+v", testdata.columns)
+
 		t.Run(testname, func(t *testing.T) {
-			c := cfg.Config{Columns: "x", UseColumns: tt.columns}
+			c := cfg.Config{Columns: "x", UseColumns: testdata.columns}
 			data := Tabdata{entries: input}
 			reduceColumns(c, &data)
-			if !reflect.DeepEqual(data.entries, tt.expect) {
-				t.Errorf("reduceColumns returned invalid data:\ngot: %+v\nexp: %+v", data.entries, tt.expect)
+			if !reflect.DeepEqual(data.entries, testdata.expect) {
+				t.Errorf("reduceColumns returned invalid data:\ngot: %+v\nexp: %+v",
+					data.entries, testdata.expect)
 			}
 		})
 	}
@@ -142,15 +145,17 @@ func TestNumberizeHeaders(t *testing.T) {
 		{[]string{"ONE", "TWO"}, []int{1, 2}, true},
 	}

-	for _, tt := range tests {
-		testname := fmt.Sprintf("numberize-headers-columns-%+v-nonum-%t", tt.columns, tt.nonum)
+	for _, testdata := range tests {
+		testname := fmt.Sprintf("numberize-headers-columns-%+v-nonum-%t",
+			testdata.columns, testdata.nonum)
+
 		t.Run(testname, func(t *testing.T) {
-			c := cfg.Config{Columns: "x", UseColumns: tt.columns, NoNumbering: tt.nonum}
+			conf := cfg.Config{Columns: "x", UseColumns: testdata.columns, NoNumbering: testdata.nonum}
 			usedata := data
-			numberizeAndReduceHeaders(c, &usedata)
-			if !reflect.DeepEqual(usedata.headers, tt.expect) {
+			numberizeAndReduceHeaders(conf, &usedata)
+			if !reflect.DeepEqual(usedata.headers, testdata.expect) {
 				t.Errorf("numberizeAndReduceHeaders returned invalid data:\ngot: %+v\nexp: %+v",
-					usedata.headers, tt.expect)
+					usedata.headers, testdata.expect)
 			}
 		})
 	}
--- a/lib/io.go
+++ b/lib/io.go
@@ -19,77 +19,100 @@ package lib

 import (
 	"errors"
-	"github.com/tlinden/tablizer/cfg"
+	"fmt"
 	"io"
 	"os"
+
+	"github.com/tlinden/tablizer/cfg"
 )

-func ProcessFiles(c *cfg.Config, args []string) error {
-	fds, pattern, err := determineIO(c, args)
+const RWRR = 0755
+
+func ProcessFiles(conf *cfg.Config, args []string) error {
+	fds, pattern, err := determineIO(conf, args)

 	if err != nil {
 		return err
 	}

-	if err := c.PreparePattern(pattern); err != nil {
+	if err := conf.PreparePattern(pattern); err != nil {
 		return err
 	}

 	for _, fd := range fds {
-		data, err := Parse(*c, fd)
+		data, err := Parse(*conf, fd)
 		if err != nil {
 			return err
 		}

-		err = PrepareColumns(c, &data)
+		if err = ValidateConsistency(&data); err != nil {
+			return err
+		}
+
+		err = PrepareColumns(conf, &data)
 		if err != nil {
 			return err
 		}

-		printData(os.Stdout, *c, &data)
+		printData(os.Stdout, *conf, &data)
 	}

 	return nil
 }

-func determineIO(c *cfg.Config, args []string) ([]io.Reader, string, error) {
-	var pattern string
-	var fds []io.Reader
-	var havefiles bool
+func determineIO(conf *cfg.Config, args []string) ([]io.Reader, string, error) {
+	var filehandles []io.Reader

-	if len(args) > 0 {
-		// threre were args left, take a look
-		if _, err := os.Stat(args[0]); err != nil {
-			// first  one is  not a  file, consider  it as  regexp and
-			// shift arg list
-			pattern = args[0]
-			c.Pattern = args[0] // used for colorization by printData()
-			args = args[1:]
-		}
+	var pattern string
+
+	var haveio bool
+
+	stat, _ := os.Stdin.Stat()
+	if (stat.Mode() & os.ModeCharDevice) == 0 {
+		// we're reading from STDIN, which takes precedence over file args
+		filehandles = append(filehandles, os.Stdin)

 		if len(args) > 0 {
-			// only files
-			for _, file := range args {
-				fd, err := os.OpenFile(file, os.O_RDONLY, 0755)
-
-				if err != nil {
-					return nil, "", err
-				}
-
-				fds = append(fds, fd)
-			}
-			havefiles = true
+			// ignore any args > 1
+			pattern = args[0]
+			conf.Pattern = args[0] // used for colorization by printData()
 		}
-	}

-	if !havefiles {
-		stat, _ := os.Stdin.Stat()
-		if (stat.Mode() & os.ModeCharDevice) == 0 {
-			fds = append(fds, os.Stdin)
+		haveio = true
+	} else if len(args) > 0 {
+		// threre were args left, take a look
+		if args[0] == "-" {
+			// in traditional unix programs a dash denotes STDIN (forced)
+			filehandles = append(filehandles, os.Stdin)
+			haveio = true
 		} else {
-			return nil, "", errors.New("No file specified and nothing to read on stdin!")
+			if _, err := os.Stat(args[0]); err != nil {
+				// first  one is  not a  file, consider  it as  regexp and
+				// shift arg list
+				pattern = args[0]
+				conf.Pattern = args[0] // used for colorization by printData()
+				args = args[1:]
+			}
+
+			if len(args) > 0 {
+				// consider any other args as files
+				for _, file := range args {
+					filehandle, err := os.OpenFile(file, os.O_RDONLY, RWRR)
+
+					if err != nil {
+						return nil, "", fmt.Errorf("failed to read input file %s: %w", file, err)
+					}
+
+					filehandles = append(filehandles, filehandle)
+					haveio = true
+				}
+			}
 		}
 	}

-	return fds, pattern, nil
+	if !haveio {
+		return nil, "", errors.New("no file specified and nothing to read on stdin")
+	}
+
+	return filehandles, pattern, nil
 }
--- a/lib/lisp.go
+++ b/lib/lisp.go
@@ -0,0 +1,313 @@
+/*
+Copyright © 2023 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package lib
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+
+	"github.com/glycerine/zygomys/zygo"
+	"github.com/tlinden/tablizer/cfg"
+)
+
+/*
+needs to be global because we can't feed an cfg object to AddHook()
+which is being called from user lisp code
+*/
+var Hooks map[string][]*zygo.SexpSymbol
+
+/*
+AddHook() (called addhook from lisp code)  can be used by the user to
+add a function to one of the available hooks provided by tablizer.
+*/
+func AddHook(env *zygo.Zlisp, name string, args []zygo.Sexp) (zygo.Sexp, error) {
+	var hookname string
+
+	if len(args) < 2 {
+		return zygo.SexpNull, errors.New("argument of %add-hook should be: %hook-name %your-function")
+	}
+
+	switch sexptype := args[0].(type) {
+	case *zygo.SexpSymbol:
+		if !HookExists(sexptype.Name()) {
+			return zygo.SexpNull, errors.New("Unknown hook " + sexptype.Name())
+		}
+
+		hookname = sexptype.Name()
+
+	default:
+		return zygo.SexpNull, errors.New("hook name must be a symbol ")
+	}
+
+	switch sexptype := args[1].(type) {
+	case *zygo.SexpSymbol:
+		_, exists := Hooks[hookname]
+		if !exists {
+			Hooks[hookname] = []*zygo.SexpSymbol{sexptype}
+		} else {
+			Hooks[hookname] = append(Hooks[hookname], sexptype)
+		}
+
+	default:
+		return zygo.SexpNull, errors.New("hook function must be a symbol ")
+	}
+
+	return zygo.SexpNull, nil
+}
+
+/*
+Check if a hook exists
+*/
+func HookExists(key string) bool {
+	for _, hook := range cfg.ValidHooks {
+		if hook == key {
+			return true
+		}
+	}
+
+	return false
+}
+
+/*
+ * Basic sanity checks and load lisp file
+ */
+func LoadAndEvalFile(env *zygo.Zlisp, path string) error {
+	if strings.HasSuffix(path, `.zy`) {
+		code, err := os.ReadFile(path)
+		if err != nil {
+			return fmt.Errorf("failed to read lisp file %s: %w", path, err)
+		}
+
+		// FIXME: check what res (_ here) could be and mean
+		_, err = env.EvalString(string(code))
+		if err != nil {
+			log.Fatal(env.GetStackTrace(err))
+		}
+	}
+
+	return nil
+}
+
+/*
+ * Setup lisp interpreter environment
+ */
+func SetupLisp(conf *cfg.Config) error {
+	// iterate over load-path and evaluate all *.zy files there, if any
+	// we ignore if load-path does not exist, which is the default anyway
+	path, err := os.Stat(conf.LispLoadPath)
+	if os.IsNotExist(err) {
+		return nil
+	}
+
+	// init global hooks
+	Hooks = make(map[string][]*zygo.SexpSymbol)
+
+	// init sandbox
+	env := zygo.NewZlispSandbox()
+	env.AddFunction("addhook", AddHook)
+
+	if !path.IsDir() {
+		// load single lisp file
+		err = LoadAndEvalFile(env, conf.LispLoadPath)
+		if err != nil {
+			return err
+		}
+	} else {
+		// load all lisp file in load dir
+		dir, err := os.ReadDir(conf.LispLoadPath)
+		if err != nil {
+			return fmt.Errorf("failed to read lisp dir %s: %w",
+				conf.LispLoadPath, err)
+		}
+
+		for _, entry := range dir {
+			if !entry.IsDir() {
+				err := LoadAndEvalFile(env, conf.LispLoadPath+"/"+entry.Name())
+				if err != nil {
+					return err
+				}
+			}
+		}
+	}
+
+	RegisterLib(env)
+
+	conf.Lisp = env
+
+	return nil
+}
+
+/*
+Execute every user lisp function registered as filter hook.
+
+Each function is given the current line as argument and is expected to
+return a boolean.   True indicates to keep the line,  false to skip
+it.
+
+If there  are multiple such  functions registered, then the  first one
+returning false wins,  that is if each function returns  true the line
+will  be kept,  if at  least one  of them  returns false,  it will  be
+skipped.
+*/
+func RunFilterHooks(conf cfg.Config, line string) (bool, error) {
+	for _, hook := range Hooks["filter"] {
+		var result bool
+
+		conf.Lisp.Clear()
+
+		res, err := conf.Lisp.EvalString(fmt.Sprintf("(%s `%s`)", hook.Name(), line))
+		if err != nil {
+			return false, fmt.Errorf("failed to evaluate hook loader: %w", err)
+		}
+
+		switch sexptype := res.(type) {
+		case *zygo.SexpBool:
+			result = sexptype.Val
+		default:
+			return false, fmt.Errorf("filter hook shall return bool")
+		}
+
+		if !result {
+			// the first hook which returns false leads to complete false
+			return result, nil
+		}
+	}
+
+	// if no hook returned false, we succeed and accept the given line
+	return true, nil
+}
+
+/*
+These hooks get the data (Tabdata) readily processed by tablizer as
+argument. They are expected to  return a SexpPair containing a boolean
+denoting  if  the data  has  been  modified  and the  actual  modified
+data. Columns must  be the same, rows may differ.  Cells may also have
+been modified.
+
+Replaces the  internal data structure  Tabdata with the  user supplied
+version.
+
+Only one process hook function is supported.
+
+The somewhat complicated code is being  caused by the fact, that we
+need to convert our internal structure  to a lisp variable and vice
+versa afterwards.
+*/
+func RunProcessHooks(conf cfg.Config, data Tabdata) (Tabdata, bool, error) {
+	var userdata Tabdata
+
+	lisplist := []zygo.Sexp{}
+
+	if len(Hooks["process"]) == 0 {
+		return userdata, false, nil
+	}
+
+	if len(Hooks["process"]) > 1 {
+		fmt.Println("Warning: only one process hook is allowed!")
+	}
+
+	// there are hook[s] installed, convert the go data structure 'data to lisp
+	for _, row := range data.entries {
+		var entry zygo.SexpHash
+
+		for idx, cell := range row {
+			err := entry.HashSet(&zygo.SexpStr{S: data.headers[idx]}, &zygo.SexpStr{S: cell})
+			if err != nil {
+				return userdata, false, fmt.Errorf("failed to convert to lisp data: %w", err)
+			}
+		}
+
+		lisplist = append(lisplist, &entry)
+	}
+
+	// we need to add it to the env so that the function can use the struct directly
+	conf.Lisp.AddGlobal("data", &zygo.SexpArray{Val: lisplist, Env: conf.Lisp})
+
+	// execute the actual hook
+	hook := Hooks["process"][0]
+
+	conf.Lisp.Clear()
+
+	var result bool
+
+	res, err := conf.Lisp.EvalString(fmt.Sprintf("(%s data)", hook.Name()))
+	if err != nil {
+		return userdata, false, fmt.Errorf("failed to eval lisp loader: %w", err)
+	}
+
+	// we expect (bool, array(hash)) as return from the function
+	switch sexptype := res.(type) {
+	case *zygo.SexpPair:
+		switch th := sexptype.Head.(type) {
+		case *zygo.SexpBool:
+			result = th.Val
+		default:
+			return userdata, false, errors.New("xpect (bool, array(hash)) as return value")
+		}
+
+		switch sexptailtype := sexptype.Tail.(type) {
+		case *zygo.SexpArray:
+			lisplist = sexptailtype.Val
+		default:
+			return userdata, false, errors.New("expect (bool, array(hash)) as return value ")
+		}
+	default:
+		return userdata, false, errors.New("filter hook shall return array of hashes ")
+	}
+
+	if !result {
+		// no further processing required
+		return userdata, result, nil
+	}
+
+	// finally convert lispdata back to Tabdata
+	for _, item := range lisplist {
+		row := []string{}
+
+		switch hash := item.(type) {
+		case *zygo.SexpHash:
+			for _, header := range data.headers {
+				entry, err := hash.HashGetDefault(
+					conf.Lisp,
+					&zygo.SexpStr{S: header},
+					&zygo.SexpStr{S: ""})
+				if err != nil {
+					return userdata, false, fmt.Errorf("failed to get lisp hash entry: %w", err)
+				}
+
+				switch sexptype := entry.(type) {
+				case *zygo.SexpStr:
+					row = append(row, sexptype.S)
+				default:
+					return userdata, false, errors.New("hsh values should be string ")
+				}
+			}
+		default:
+			return userdata, false, errors.New("rturned array should contain hashes ")
+		}
+
+		userdata.entries = append(userdata.entries, row)
+	}
+
+	userdata.headers = data.headers
+
+	return userdata, result, nil
+}
--- a/lib/lisplib.go
+++ b/lib/lisplib.go
@@ -0,0 +1,88 @@
+/*
+Copyright © 2023 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package lib
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strconv"
+
+	"github.com/glycerine/zygomys/zygo"
+)
+
+func Splice2SexpList(list []string) zygo.Sexp {
+	slist := []zygo.Sexp{}
+
+	for _, item := range list {
+		slist = append(slist, &zygo.SexpStr{S: item})
+	}
+
+	return zygo.MakeList(slist)
+}
+
+func StringReSplit(env *zygo.Zlisp, name string, args []zygo.Sexp) (zygo.Sexp, error) {
+	if len(args) < 2 {
+		return zygo.SexpNull, errors.New("expecting 2 arguments")
+	}
+
+	var separator, input string
+
+	switch t := args[0].(type) {
+	case *zygo.SexpStr:
+		input = t.S
+	default:
+		return zygo.SexpNull, errors.New("second argument must be a string")
+	}
+
+	switch t := args[1].(type) {
+	case *zygo.SexpStr:
+		separator = t.S
+	default:
+		return zygo.SexpNull, errors.New("first argument must be a string")
+	}
+
+	sep := regexp.MustCompile(separator)
+
+	return Splice2SexpList(sep.Split(input, -1)), nil
+}
+
+func String2Int(env *zygo.Zlisp, name string, args []zygo.Sexp) (zygo.Sexp, error) {
+	var number int
+
+	switch t := args[0].(type) {
+	case *zygo.SexpStr:
+		num, err := strconv.Atoi(t.S)
+
+		if err != nil {
+			return zygo.SexpNull, fmt.Errorf("failed to convert string to number: %w", err)
+		}
+
+		number = num
+
+	default:
+		return zygo.SexpNull, errors.New("argument must be a string")
+	}
+
+	return &zygo.SexpInt{Val: int64(number)}, nil
+}
+
+func RegisterLib(env *zygo.Zlisp) {
+	env.AddFunction("resplit", StringReSplit)
+	env.AddFunction("atoi", String2Int)
+}
--- a/lib/parser.go
+++ b/lib/parser.go
@@ -1,5 +1,5 @@
 /*
-Copyright © 2022 Thomas von Dein
+Copyright © 2022-2024 Thomas von Dein

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -20,61 +20,44 @@ package lib
 import (
 	"bufio"
 	"encoding/csv"
-	"errors"
 	"fmt"
-	"github.com/alecthomas/repr"
-	"github.com/tlinden/tablizer/cfg"
 	"io"
 	"regexp"
 	"strings"
+
+	"github.com/alecthomas/repr"
+	"github.com/tlinden/tablizer/cfg"
 )

 /*
-   Parser switch
+Parser switch
 */
-func Parse(c cfg.Config, input io.Reader) (Tabdata, error) {
-	if len(c.Separator) == 1 {
-		return parseCSV(c, input)
+func Parse(conf cfg.Config, input io.Reader) (Tabdata, error) {
+	if len(conf.Separator) == 1 {
+		return parseCSV(conf, input)
 	}

-	return parseTabular(c, input)
+	return parseTabular(conf, input)
 }

 /*
-   Parse CSV input.
+Parse CSV input.
 */
-func parseCSV(c cfg.Config, input io.Reader) (Tabdata, error) {
-	var content io.Reader = input
+func parseCSV(conf cfg.Config, input io.Reader) (Tabdata, error) {
 	data := Tabdata{}

-	if len(c.Pattern) > 0 {
-		scanner := bufio.NewScanner(input)
-		lines := []string{}
-		hadFirst := false
-		for scanner.Scan() {
-			line := strings.TrimSpace(scanner.Text())
-			if hadFirst {
-				// don't match 1st line, it's the header
-				if c.PatternR.MatchString(line) == c.InvertMatch {
-					// by default  -v is false, so if a  line does NOT
-					// match the pattern, we will ignore it. However,
-					// if the user specified -v, the matching is inverted,
-					// so we ignore all lines, which DO match.
-					continue
-				}
-			}
-			lines = append(lines, line)
-			hadFirst = true
-		}
-		content = strings.NewReader(strings.Join(lines, "\n"))
+	// apply pattern, if any
+	content, err := FilterByPattern(conf, input)
+	if err != nil {
+		return data, err
 	}

 	csvreader := csv.NewReader(content)
-	csvreader.Comma = rune(c.Separator[0])
+	csvreader.Comma = rune(conf.Separator[0])

 	records, err := csvreader.ReadAll()
 	if err != nil {
-		return data, errors.Unwrap(fmt.Errorf("Could not parse CSV input: %w", err))
+		return data, fmt.Errorf("could not parse CSV input: %w", err)
 	}

 	if len(records) >= 1 {
@@ -94,19 +77,29 @@ func parseCSV(c cfg.Config, input io.Reader) (Tabdata, error) {
 		}
 	}

+	// apply user defined lisp process hooks, if any
+	userdata, changed, err := RunProcessHooks(conf, data)
+	if err != nil {
+		return data, fmt.Errorf("failed to apply filter hook: %w", err)
+	}
+
+	if changed {
+		data = userdata
+	}
+
 	return data, nil
 }

 /*
-   Parse tabular input.
+Parse tabular input.
 */
-func parseTabular(c cfg.Config, input io.Reader) (Tabdata, error) {
+func parseTabular(conf cfg.Config, input io.Reader) (Tabdata, error) {
 	data := Tabdata{}

 	var scanner *bufio.Scanner

 	hadFirst := false
-	separate := regexp.MustCompile(c.Separator)
+	separate := regexp.MustCompile(conf.Separator)

 	scanner = bufio.NewScanner(input)

@@ -123,10 +116,6 @@ func parseTabular(c cfg.Config, input io.Reader) (Tabdata, error) {

 			// process all header fields
 			for _, part := range parts {
-				// if Debug {
-				// 	fmt.Printf("Part: <%s>\n", string(line[beg:part[0]]))
-				//}
-
 				// register widest header field
 				headerlen := len(part)
 				if headerlen > data.maxwidthHeader {
@@ -141,14 +130,24 @@ func parseTabular(c cfg.Config, input io.Reader) (Tabdata, error) {
 			}
 		} else {
 			// data processing
-			if len(c.Pattern) > 0 {
-				if c.PatternR.MatchString(line) == c.InvertMatch {
-					// by default  -v is false, so if a  line does NOT
-					// match the pattern, we will ignore it. However,
-					// if the user specified -v, the matching is inverted,
-					// so we ignore all lines, which DO match.
-					continue
-				}
+			if conf.Pattern != "" && matchPattern(conf, line) == conf.InvertMatch {
+				// by default  -v is false, so if a  line does NOT
+				// match the pattern, we will ignore it. However,
+				// if the user specified -v, the matching is inverted,
+				// so we ignore all lines, which DO match.
+				continue
+			}
+
+			// apply user defined lisp filters, if any
+			accept, err := RunFilterHooks(conf, line)
+			if err != nil {
+				return data, fmt.Errorf("failed to apply filter hook: %w", err)
+			}
+
+			if !accept {
+				//  IF there  are filter  hook[s] and  IF one  of them
+				// returns false on the current line, reject it
+				continue
 			}

 			idx := 0 // we cannot use the header index, because we could exclude columns
@@ -172,10 +171,30 @@ func parseTabular(c cfg.Config, input io.Reader) (Tabdata, error) {
 	}

 	if scanner.Err() != nil {
-		return data, errors.Unwrap(fmt.Errorf("Failed to read from io.Reader: %w", scanner.Err()))
+		return data, fmt.Errorf("failed to read from io.Reader: %w", scanner.Err())
 	}

-	if c.Debug {
+	// filter by field filters, if any
+	filtereddata, changed, err := FilterByFields(conf, data)
+	if err != nil {
+		return data, fmt.Errorf("failed to filter fields: %w", err)
+	}
+
+	if changed {
+		data = filtereddata
+	}
+
+	// apply user defined lisp process hooks, if any
+	userdata, changed, err := RunProcessHooks(conf, data)
+	if err != nil {
+		return data, fmt.Errorf("failed to apply filter hook: %w", err)
+	}
+
+	if changed {
+		data = userdata
+	}
+
+	if conf.Debug {
 		repr.Print(data)
 	}

--- a/lib/parser_test.go
+++ b/lib/parser_test.go
@@ -19,10 +19,11 @@ package lib

 import (
 	"fmt"
-	"github.com/tlinden/tablizer/cfg"
 	"reflect"
 	"strings"
 	"testing"
+
+	"github.com/tlinden/tablizer/cfg"
 )

 var input = []struct {
@@ -61,12 +62,12 @@ func TestParser(t *testing.T) {
 		},
 	}

-	for _, in := range input {
-		testname := fmt.Sprintf("parse-%s", in.name)
+	for _, testdata := range input {
+		testname := fmt.Sprintf("parse-%s", testdata.name)
 		t.Run(testname, func(t *testing.T) {
-			readFd := strings.NewReader(strings.TrimSpace(in.text))
-			c := cfg.Config{Separator: in.separator}
-			gotdata, err := Parse(c, readFd)
+			readFd := strings.NewReader(strings.TrimSpace(testdata.text))
+			conf := cfg.Config{Separator: testdata.separator}
+			gotdata, err := Parse(conf, readFd)

 			if err != nil {
 				t.Errorf("Parser returned error: %s\nData processed so far: %+v", err, gotdata)
@@ -103,28 +104,28 @@ func TestParserPatternmatching(t *testing.T) {
 		},
 	}

-	for _, in := range input {
-		for _, tt := range tests {
+	for _, inputdata := range input {
+		for _, testdata := range tests {
 			testname := fmt.Sprintf("parse-%s-with-pattern-%s-inverted-%t",
-				in.name, tt.pattern, tt.invert)
+				inputdata.name, testdata.pattern, testdata.invert)
 			t.Run(testname, func(t *testing.T) {
-				c := cfg.Config{InvertMatch: tt.invert, Pattern: tt.pattern,
-					Separator: in.separator}
+				conf := cfg.Config{InvertMatch: testdata.invert, Pattern: testdata.pattern,
+					Separator: inputdata.separator}

-				_ = c.PreparePattern(tt.pattern)
+				_ = conf.PreparePattern(testdata.pattern)

-				readFd := strings.NewReader(strings.TrimSpace(in.text))
-				gotdata, err := Parse(c, readFd)
+				readFd := strings.NewReader(strings.TrimSpace(inputdata.text))
+				gotdata, err := Parse(conf, readFd)

 				if err != nil {
-					if !tt.want {
+					if !testdata.want {
 						t.Errorf("Parser returned error: %s\nData processed so far: %+v",
 							err, gotdata)
 					}
 				} else {
-					if !reflect.DeepEqual(tt.entries, gotdata.entries) {
+					if !reflect.DeepEqual(testdata.entries, gotdata.entries) {
 						t.Errorf("Parser returned invalid data (pattern: %s, invert: %t)\nExp: %+v\nGot: %+v\n",
-							tt.pattern, tt.invert, tt.entries, gotdata.entries)
+							testdata.pattern, testdata.invert, testdata.entries, gotdata.entries)
 					}
 				}
 			})
@@ -151,8 +152,8 @@ asd    igig
 19191  EDD 1  X`

 	readFd := strings.NewReader(strings.TrimSpace(table))
-	c := cfg.Config{Separator: cfg.DefaultSeparator}
-	gotdata, err := Parse(c, readFd)
+	conf := cfg.Config{Separator: cfg.DefaultSeparator}
+	gotdata, err := Parse(conf, readFd)

 	if err != nil {
 		t.Errorf("Parser returned error: %s\nData processed so far: %+v", err, gotdata)
@@ -160,6 +161,6 @@ asd    igig

 	if !reflect.DeepEqual(data, gotdata) {
 		t.Errorf("Parser returned invalid data, Regex: %s\nExp: %+v\nGot: %+v\n",
-			c.Separator, data, gotdata)
+			conf.Separator, data, gotdata)
 	}
 }
--- a/lib/printer.go
+++ b/lib/printer.go
@@ -20,62 +20,62 @@ package lib
 import (
 	"encoding/csv"
 	"fmt"
-	"github.com/gookit/color"
-	"github.com/olekukonko/tablewriter"
-	"github.com/tlinden/tablizer/cfg"
-	"gopkg.in/yaml.v3"
 	"io"
 	"log"
 	"regexp"
 	"strconv"
 	"strings"
+
+	"github.com/gookit/color"
+	"github.com/olekukonko/tablewriter"
+	"github.com/tlinden/tablizer/cfg"
+	"gopkg.in/yaml.v3"
 )

-func printData(w io.Writer, c cfg.Config, data *Tabdata) {
-	// some output preparations:
-
+func printData(writer io.Writer, conf cfg.Config, data *Tabdata) {
 	// add numbers to headers and remove this we're not interested in
-	numberizeAndReduceHeaders(c, data)
+	numberizeAndReduceHeaders(conf, data)

 	// remove unwanted columns, if any
-	reduceColumns(c, data)
+	reduceColumns(conf, data)

 	// sort the data
-	sortTable(c, data)
+	sortTable(conf, data)

-	switch c.OutputMode {
+	switch conf.OutputMode {
 	case cfg.Extended:
-		printExtendedData(w, c, data)
-	case cfg.Ascii:
-		printAsciiData(w, c, data)
+		printExtendedData(writer, conf, data)
+	case cfg.ASCII:
+		printASCIIData(writer, conf, data)
 	case cfg.Orgtbl:
-		printOrgmodeData(w, c, data)
+		printOrgmodeData(writer, conf, data)
 	case cfg.Markdown:
-		printMarkdownData(w, c, data)
+		printMarkdownData(writer, conf, data)
 	case cfg.Shell:
-		printShellData(w, c, data)
+		printShellData(writer, data)
 	case cfg.Yaml:
-		printYamlData(w, c, data)
+		printYamlData(writer, data)
 	case cfg.CSV:
-		printCSVData(w, c, data)
+		printCSVData(writer, data)
 	default:
-		printAsciiData(w, c, data)
+		printASCIIData(writer, conf, data)
 	}
-
 }

-func output(w io.Writer, str string) {
-	fmt.Fprint(w, str)
+func output(writer io.Writer, str string) {
+	fmt.Fprint(writer, str)
 }

 /*
-   Emacs org-mode compatible table (also orgtbl-mode)
+Emacs org-mode compatible table (also orgtbl-mode)
 */
-func printOrgmodeData(w io.Writer, c cfg.Config, data *Tabdata) {
+func printOrgmodeData(writer io.Writer, conf cfg.Config, data *Tabdata) {
 	tableString := &strings.Builder{}
 	table := tablewriter.NewWriter(tableString)

-	table.SetHeader(data.headers)
+	if !conf.NoHeaders {
+		table.SetHeader(data.headers)
+	}

 	for _, row := range data.entries {
 		table.Append(trimRow(row))
@@ -97,20 +97,22 @@ func printOrgmodeData(w io.Writer, c cfg.Config, data *Tabdata) {
 	leftR := regexp.MustCompile(`(?m)^\\+`)
 	rightR := regexp.MustCompile(`\\+(?m)$`)

-	output(w, color.Sprint(
-		colorizeData(c,
+	output(writer, color.Sprint(
+		colorizeData(conf,
 			rightR.ReplaceAllString(
 				leftR.ReplaceAllString(tableString.String(), "|"), "|"))))
 }

 /*
-   Markdown table
+Markdown table
 */
-func printMarkdownData(w io.Writer, c cfg.Config, data *Tabdata) {
+func printMarkdownData(writer io.Writer, conf cfg.Config, data *Tabdata) {
 	tableString := &strings.Builder{}
 	table := tablewriter.NewWriter(tableString)

-	table.SetHeader(data.headers)
+	if !conf.NoHeaders {
+		table.SetHeader(data.headers)
+	}

 	for _, row := range data.entries {
 		table.Append(trimRow(row))
@@ -120,22 +122,21 @@ func printMarkdownData(w io.Writer, c cfg.Config, data *Tabdata) {
 	table.SetCenterSeparator("|")

 	table.Render()
-	output(w, color.Sprint(colorizeData(c, tableString.String())))
+	output(writer, color.Sprint(colorizeData(conf, tableString.String())))
 }

 /*
-   Simple ASCII table without any borders etc, just like the input we expect
+Simple ASCII table without any borders etc, just like the input we expect
 */
-func printAsciiData(w io.Writer, c cfg.Config, data *Tabdata) {
+func printASCIIData(writer io.Writer, conf cfg.Config, data *Tabdata) {
 	tableString := &strings.Builder{}
 	table := tablewriter.NewWriter(tableString)

-	table.SetHeader(data.headers)
-	table.AppendBulk(data.entries)
+	if !conf.NoHeaders {
+		table.SetHeader(data.headers)
+	}

-	// for _, row := range data.entries {
-	// 	table.Append(trimRow(row))
-	// }
+	table.AppendBulk(data.entries)

 	table.SetAutoWrapText(false)
 	table.SetAutoFormatHeaders(true)
@@ -146,20 +147,27 @@ func printAsciiData(w io.Writer, c cfg.Config, data *Tabdata) {
 	table.SetRowSeparator("")
 	table.SetHeaderLine(false)
 	table.SetBorder(false)
-	table.SetTablePadding("\t") // pad with tabs
 	table.SetNoWhiteSpace(true)

+	if !conf.UseHighlight {
+		// the tabs destroy the highlighting
+		table.SetTablePadding("\t") // pad with tabs
+	} else {
+		table.SetTablePadding("   ")
+	}
+
 	table.Render()
-	output(w, color.Sprint(colorizeData(c, tableString.String())))
+	output(writer, color.Sprint(colorizeData(conf, tableString.String())))
 }

 /*
-   We simulate the \x command of psql (the PostgreSQL client)
+We simulate the \x command of psql (the PostgreSQL client)
 */
-func printExtendedData(w io.Writer, c cfg.Config, data *Tabdata) {
+func printExtendedData(writer io.Writer, conf cfg.Config, data *Tabdata) {
 	// needed for data output
 	format := fmt.Sprintf("%%%ds: %%s\n", data.maxwidthHeader)
 	out := ""
+
 	if len(data.entries) > 0 {
 		for _, entry := range data.entries {
 			for i, value := range entry {
@@ -170,67 +178,71 @@ func printExtendedData(w io.Writer, c cfg.Config, data *Tabdata) {
 		}
 	}

-	output(w, colorizeData(c, out))
+	output(writer, colorizeData(conf, out))
 }

 /*
-   Shell output, ready to be eval'd. Just like FreeBSD stat(1)
+Shell output, ready to be eval'd. Just like FreeBSD stat(1)
 */
-func printShellData(w io.Writer, c cfg.Config, data *Tabdata) {
+func printShellData(writer io.Writer, data *Tabdata) {
 	out := ""
+
 	if len(data.entries) > 0 {
 		for _, entry := range data.entries {
 			shentries := []string{}
-			for i, value := range entry {
+
+			for idx, value := range entry {
 				shentries = append(shentries, fmt.Sprintf("%s=\"%s\"",
-					data.headers[i], value))
+					data.headers[idx], value))
 			}
-			out += fmt.Sprint(strings.Join(shentries, " ")) + "\n"
+
+			out += strings.Join(shentries, " ") + "\n"
 		}
 	}

 	// no colorization here
-	output(w, out)
+	output(writer, out)
 }

-func printYamlData(w io.Writer, c cfg.Config, data *Tabdata) {
-	type D struct {
+func printYamlData(writer io.Writer, data *Tabdata) {
+	type Data struct {
 		Entries []map[string]interface{} `yaml:"entries"`
 	}

-	d := D{}
+	yamlout := Data{}

 	for _, entry := range data.entries {
-		ml := map[string]interface{}{}
+		yamldata := map[string]interface{}{}

-		for i, entry := range entry {
+		for idx, entry := range entry {
 			style := yaml.TaggedStyle
+
 			_, err := strconv.Atoi(entry)
 			if err != nil {
 				style = yaml.DoubleQuotedStyle
 			}

-			ml[strings.ToLower(data.headers[i])] =
+			yamldata[strings.ToLower(data.headers[idx])] =
 				&yaml.Node{
 					Kind:  yaml.ScalarNode,
 					Style: style,
 					Value: entry}
 		}

-		d.Entries = append(d.Entries, ml)
+		yamlout.Entries = append(yamlout.Entries, yamldata)
 	}

-	yamlstr, err := yaml.Marshal(&d)
+	yamlstr, err := yaml.Marshal(&yamlout)

 	if err != nil {
 		log.Fatal(err)
 	}

-	output(w, string(yamlstr))
+	output(writer, string(yamlstr))
 }

-func printCSVData(w io.Writer, c cfg.Config, data *Tabdata) {
-	csvout := csv.NewWriter(w)
+func printCSVData(writer io.Writer, data *Tabdata) {
+	csvout := csv.NewWriter(writer)

 	if err := csvout.Write(data.headers); err != nil {
 		log.Fatalln("error writing record to csv:", err)
--- a/lib/printer_test.go
+++ b/lib/printer_test.go
@@ -20,10 +20,10 @@ package lib
 import (
 	"bytes"
 	"fmt"
-	//"github.com/alecthomas/repr"
-	"github.com/tlinden/tablizer/cfg"
 	"strings"
 	"testing"
+
+	"github.com/tlinden/tablizer/cfg"
 )

 func newData() Tabdata {
@@ -73,7 +73,7 @@ var tests = []struct {
 }{
 	// --------------------- Default settings mode tests ``
 	{
-		mode: cfg.Ascii,
+		mode: cfg.ASCII,
 		name: "default",
 		expect: `
 NAME(1)	DURATION(2)	COUNT(3)	WHEN(4)                    
@@ -250,39 +250,39 @@ DURATION(2)	WHEN(4)
 }

 func TestPrinter(t *testing.T) {
-	for _, tt := range tests {
+	for _, testdata := range tests {
 		testname := fmt.Sprintf("print-sortcol-%d-desc-%t-sortby-%s-mode-%d-usecolumns-%s",
-			tt.column, tt.desc, tt.sortby, tt.mode, tt.usecolstr)
+			testdata.column, testdata.desc, testdata.sortby, testdata.mode, testdata.usecolstr)
 		t.Run(testname, func(t *testing.T) {
 			// replaces os.Stdout, but we ignore it
-			var w bytes.Buffer
+			var writer bytes.Buffer

 			// cmd flags
-			c := cfg.Config{
-				SortByColumn:   tt.column,
-				SortDescending: tt.desc,
-				SortMode:       tt.sortby,
-				OutputMode:     tt.mode,
-				NoNumbering:    tt.nonum,
-				UseColumns:     tt.usecol,
+			conf := cfg.Config{
+				SortByColumn:   testdata.column,
+				SortDescending: testdata.desc,
+				SortMode:       testdata.sortby,
+				OutputMode:     testdata.mode,
+				NoNumbering:    testdata.nonum,
+				UseColumns:     testdata.usecol,
 				NoColor:        true,
 			}

-			c.ApplyDefaults()
+			conf.ApplyDefaults()

 			// the test checks the len!
-			if len(tt.usecol) > 0 {
-				c.Columns = "yes"
+			if len(testdata.usecol) > 0 {
+				conf.Columns = "yes"
 			} else {
-				c.Columns = ""
+				conf.Columns = ""
 			}

-			testdata := newData()
-			exp := strings.TrimSpace(tt.expect)
+			data := newData()
+			exp := strings.TrimSpace(testdata.expect)

-			printData(&w, c, &testdata)
+			printData(&writer, conf, &data)

-			got := strings.TrimSpace(w.String())
+			got := strings.TrimSpace(writer.String())

 			if got != exp {
 				t.Errorf("not rendered correctly:\n+++ got:\n%s\n+++ want:\n%s",
--- a/lib/sort.go
+++ b/lib/sort.go
@@ -18,21 +18,22 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 package lib

 import (
-	"github.com/araddon/dateparse"
-	"github.com/tlinden/tablizer/cfg"
 	"regexp"
 	"sort"
 	"strconv"
+
+	"github.com/araddon/dateparse"
+	"github.com/tlinden/tablizer/cfg"
 )

-func sortTable(c cfg.Config, data *Tabdata) {
-	if c.SortByColumn <= 0 {
+func sortTable(conf cfg.Config, data *Tabdata) {
+	if conf.SortByColumn <= 0 {
 		// no sorting wanted
 		return
 	}

 	// slightly modified here to match internal array indicies
-	col := c.SortByColumn
+	col := conf.SortByColumn

 	col-- // ui starts counting by 1, but use 0 internally

@@ -48,38 +49,42 @@ func sortTable(c cfg.Config, data *Tabdata) {

 	// actual sorting
 	sort.SliceStable(data.entries, func(i, j int) bool {
-		return compare(&c, data.entries[i][col], data.entries[j][col])
+		return compare(&conf, data.entries[i][col], data.entries[j][col])
 	})
 }

 // config is not modified here, but it would be inefficient to copy it every loop
-func compare(c *cfg.Config, a string, b string) bool {
+func compare(conf *cfg.Config, left string, right string) bool {
 	var comp bool

-	switch c.SortMode {
+	switch conf.SortMode {
 	case "numeric":
-		left, err := strconv.Atoi(a)
+		left, err := strconv.Atoi(left)
 		if err != nil {
 			left = 0
 		}
-		right, err := strconv.Atoi(b)
+
+		right, err := strconv.Atoi(right)
 		if err != nil {
 			right = 0
 		}
+
 		comp = left < right
 	case "duration":
-		left := duration2int(a)
-		right := duration2int(b)
+		left := duration2int(left)
+		right := duration2int(right)
+
 		comp = left < right
 	case "time":
-		left, _ := dateparse.ParseAny(a)
-		right, _ := dateparse.ParseAny(b)
+		left, _ := dateparse.ParseAny(left)
+		right, _ := dateparse.ParseAny(right)
+
 		comp = left.Unix() < right.Unix()
 	default:
-		comp = a < b
+		comp = left < right
 	}

-	if c.SortDescending {
+	if conf.SortDescending {
 		comp = !comp
 	}

@@ -87,15 +92,15 @@ func compare(c *cfg.Config, a string, b string) bool {
 }

 /*
-   We could use time.ParseDuration(), but this doesn't support days.
+We could use time.ParseDuration(), but this doesn't support days.

-   We  could also  use github.com/xhit/go-str2duration/v2,  which does
-   the job,  but it's  just another dependency,  just for  this little
-   gem. And  we don't need a  time.Time value. And int  is good enough
-   for duration comparision.
+We  could also  use github.com/xhit/go-str2duration/v2,  which does
+the job,  but it's  just another dependency,  just for  this little
+gem. And  we don't need a  time.Time value. And int  is good enough
+for duration comparison.

-   Convert a  durartion into  an integer.  Valid  time units  are "s",
-   "m", "h" and "d".
+Convert a  duration into  an integer.  Valid  time units  are "s",
+"m", "h" and "d".
 */
 func duration2int(duration string) int {
 	re := regexp.MustCompile(`(\d+)([dhms])`)
@@ -103,16 +108,17 @@ func duration2int(duration string) int {

 	for _, match := range re.FindAllStringSubmatch(duration, -1) {
 		if len(match) == 3 {
-			v, _ := strconv.Atoi(match[1])
+			durationvalue, _ := strconv.Atoi(match[1])
+
 			switch match[2][0] {
 			case 'd':
-				seconds += v * 86400
+				seconds += durationvalue * 86400
 			case 'h':
-				seconds += v * 3600
+				seconds += durationvalue * 3600
 			case 'm':
-				seconds += v * 60
+				seconds += durationvalue * 60
 			case 's':
-				seconds += v
+				seconds += durationvalue
 			}
 		}
 	}
--- a/lib/sort_test.go
+++ b/lib/sort_test.go
@@ -19,8 +19,9 @@ package lib

 import (
 	"fmt"
-	"github.com/tlinden/tablizer/cfg"
 	"testing"
+
+	"github.com/tlinden/tablizer/cfg"
 )

 func TestDuration2Seconds(t *testing.T) {
@@ -36,12 +37,12 @@ func TestDuration2Seconds(t *testing.T) {
 		{"19t77X what?4s", 4},
 	}

-	for _, tt := range tests {
-		testname := fmt.Sprintf("duration-%s", tt.dur)
+	for _, testdata := range tests {
+		testname := fmt.Sprintf("duration-%s", testdata.dur)
 		t.Run(testname, func(t *testing.T) {
-			seconds := duration2int(tt.dur)
-			if seconds != tt.expect {
-				t.Errorf("got %d, want %d", seconds, tt.expect)
+			seconds := duration2int(testdata.dur)
+			if seconds != testdata.expect {
+				t.Errorf("got %d, want %d", seconds, testdata.expect)
 			}
 		})
 	}
@@ -66,13 +67,15 @@ func TestCompare(t *testing.T) {
 		{"time", "12/24/2022", "1/1/1970", true, true},
 	}

-	for _, tt := range tests {
-		testname := fmt.Sprintf("compare-mode-%s-a-%s-b-%s-desc-%t", tt.mode, tt.a, tt.b, tt.desc)
+	for _, testdata := range tests {
+		testname := fmt.Sprintf("compare-mode-%s-a-%s-b-%s-desc-%t",
+			testdata.mode, testdata.a, testdata.b, testdata.desc)
+
 		t.Run(testname, func(t *testing.T) {
-			c := cfg.Config{SortMode: tt.mode, SortDescending: tt.desc}
-			got := compare(&c, tt.a, tt.b)
-			if got != tt.want {
-				t.Errorf("got %t, want %t", got, tt.want)
+			c := cfg.Config{SortMode: testdata.mode, SortDescending: testdata.desc}
+			got := compare(&c, testdata.a, testdata.b)
+			if got != testdata.want {
+				t.Errorf("got %t, want %t", got, testdata.want)
 			}
 		})
 	}
--- a/mkrel.sh
+++ b/mkrel.sh
@@ -43,7 +43,7 @@ for D in $DIST; do
    tardir="${tool}-${os}-${arch}-${version}"
    tarfile="releases/${tool}-${os}-${arch}-${version}.tar.gz"
    set -x
-    GOOS=${os} GOARCH=${arch} go build -o ${binfile} -ldflags "-X 'github.com/tlinden/tablizer/lib.VERSION=${version}'"
+    GOOS=${os} GOARCH=${arch} go build -o ${binfile} -ldflags "-X 'github.com/tlinden/tablizer/cfg.VERSION=${version}'"
    mkdir -p ${tardir}
    cp ${binfile} README.md LICENSE ${tardir}/
    echo 'tool = tablizer
--- a/t/plugintest.zy
+++ b/t/plugintest.zy
@@ -0,0 +1,10 @@
+/*
+Simple filter hook function. Splits the argument by whitespace,
+fetches the 2nd element, converts it to an int and returns true
+if it s larger than 5, false otherwise.
+*/
+(defn uselarge [line]
+  (cond (> (atoi (second (resplit line `\s+`))) 5) true false))
+
+/* Register the filter hook */
+(addhook %filter %uselarge)
--- a/t/test.sh
+++ b/t/test.sh
@@ -0,0 +1,45 @@
+#!/bin/sh
+
+# simple commandline unit test script
+
+t="../tablizer"
+fail=0
+
+ex() {
+    # execute a test, report+exit on error, stay silent otherwise
+    log="/tmp/test-tablizer.$$.log"
+    name=$1
+    shift
+
+    echo -n "TEST $name "
+
+    $* > $log 2>&1
+
+    if test $? -ne 0; then
+        echo "failed, see $log"
+        fail=1
+    else
+        echo "ok"
+        rm -f $log
+    fi
+}
+
+# only use files in test dir
+cd $(dirname $0)
+
+echo "Executing commandline tests ..."
+
+# io pattern tests
+ex io-pattern-and-file $t bk7 testtable
+cat testtable | ex io-pattern-and-stdin $t bk7
+cat testtable | ex io-pattern-and-stdin-dash $t bk7 -
+
+# same w/o pattern
+ex io-just-file $t testtable
+cat testtable | ex io-just-stdin $t
+cat testtable | ex io-just-stdin-dash $t -
+
+if test $fail -ne 0; then
+    echo "!!! Some tests failed !!!"
+    exit 1
+fi
--- a/t/testtable
+++ b/t/testtable
@@ -0,0 +1,6 @@
+NAME                                                 READY   STATUS    RESTARTS       AGE
+alertmanager-kube-prometheus-alertmanager-0          2/2     Running   35 (45m ago)   11d
+grafana-fcc54cbc9-bk7s8                              1/1     Running   17 (45m ago)   1d
+kube-prometheus-blackbox-exporter-5d85b5d8f4-tskh7   1/1     Running   17 (45m ago)   1h44m
+kube-prometheus-kube-state-metrics-b4cd9487-75p7f    1/1     Running   20 (45m ago)   45m
+kube-prometheus-node-exporter-bfzpl                  1/1     Running   17 (45m ago)   54s
--- a/t/testtable2
+++ b/t/testtable2
@@ -0,0 +1,6 @@
+NAME  DURATION
+x     10
+a     100
+z     0
+u     4
+k     6
--- a/tablizer.1
+++ b/tablizer.1
@@ -133,7 +133,7 @@
 .\" ========================================================================
 .\"
 .IX Title "TABLIZER 1"
-.TH TABLIZER 1 "2022-10-23" "1" "User Commands"
+.TH TABLIZER 1 "2024-05-07" "1" "User Commands"
 .\" For nroff, turn off justification.  Always turn off hyphenation; it makes
 .\" way too many mistakes in technical documents.
 .if n .ad l
@@ -151,17 +151,21 @@ tablizer \- Manipulate tabular output of other programs
 \&      \-v, \-\-invert\-match       select non\-matching rows
 \&      \-n, \-\-no\-numbering       Disable header numbering
 \&      \-N, \-\-no\-color           Disable pattern highlighting
+\&      \-H, \-\-no\-headers         Disable headers display
 \&      \-s, \-\-separator string   Custom field separator
 \&      \-k, \-\-sort\-by int        Sort by column (default: 1)
+\&      \-z, \-\-fuzzy              Use fuzzy search [experimental]
+\&      \-F, \-\-filter field=reg   Filter given field with regex, can be used multiple times
 \&
 \&    Output Flags (mutually exclusive):
 \&      \-X, \-\-extended           Enable extended output
 \&      \-M, \-\-markdown           Enable markdown table output
 \&      \-O, \-\-orgtbl             Enable org\-mode table output
-\&      \-S, \-\-shell              Enable shell evaluable ouput
+\&      \-S, \-\-shell              Enable shell evaluable output
 \&      \-Y, \-\-yaml               Enable yaml output
 \&      \-C, \-\-csv                Enable CSV output
 \&      \-A, \-\-ascii              Default output mode, ascii tabular
+\&      \-L, \-\-hightlight\-lines   Use alternating background colors for tables
 \&
 \&    Sort Mode Flags (mutually exclusive):
 \&      \-a, \-\-sort\-age           sort according to age (duration) string
@@ -170,10 +174,12 @@ tablizer \- Manipulate tabular output of other programs
 \&      \-t, \-\-sort\-time          sort according to time string
 \&
 \&    Other Flags:
+\&          \-\-completion <shell> Generate the autocompletion script for <shell>
+\&      \-f, \-\-config <file>      Configuration file (default: ~/.config/tablizer/config)
 \&      \-d, \-\-debug              Enable debugging
 \&      \-h, \-\-help               help for tablizer
 \&      \-m, \-\-man                Display manual page
-\&      \-v, \-\-version            Print program version
+\&      \-V, \-\-version            Print program version
 .Ve
 .SH "DESCRIPTION"
 .IX Header "DESCRIPTION"
@@ -233,6 +239,11 @@ the original order.
 .PP
 The numbering can be suppressed by using the \fB\-n\fR option.
 .PP
+By  default tablizer  shows  a  header containing  the  names of  each
+column.  This can  be disabled using the \fB\-H\fR option.   Be aware that
+this only affects tabular output modes.  Shell, Extended, Yaml and \s-1CSV\s0
+output modes always use the column names.
+.PP
 By  default, if  a  \fBpattern\fR  has been  speficied,  matches will  be
 highlighted. You can disable this behavior with the \fB\-N\fR option.
 .PP
@@ -254,8 +265,8 @@ Sorts timestamps.
 .PP
 Finally the  \fB\-d\fR option  enables debugging  output which  is mostly
 useful for the developer.
-.SS "\s-1PATTERNS\s0"
-.IX Subsection "PATTERNS"
+.SS "\s-1PATTERNS AND FILTERING\s0"
+.IX Subsection "PATTERNS AND FILTERING"
 You can reduce the rows being  displayed by using a regular expression
 pattern.  The  regexp is  \s-1PCRE\s0 compatible, refer  to the  syntax cheat
 sheet here: <https://github.com/google/re2/wiki/Syntax>.  If you want
@@ -286,6 +297,25 @@ Example for a case insensitive search:
 .Vb 1
 \&    kubectl get pods \-A | tablizer "(?i)account"
 .Ve
+.PP
+You  can use  the experimental  fuzzy search  feature by  providing the
+option \fB\-z\fR, in which case the  pattern is regarded as a fuzzy search
+term, not a regexp.
+.PP
+Sometimes you want to  filter by one or more columns.  You can do that
+using the \fB\-F\fR option. The option can be specified multiple times and
+has the following format:
+.PP
+.Vb 1
+\&    fieldname=regexp
+.Ve
+.PP
+Fieldnames (== columns headers) are case insensitive.
+.PP
+If you specify more than one filter, both filters have to match (\s-1AND\s0
+operation).
+.PP
+If the option \fB\-v\fR is specified, the filtering is inverted.
 .SS "\s-1COLUMNS\s0"
 .IX Subsection "COLUMNS"
 The  parameter  \fB\-c\fR  can  be  used  to  specify,  which  columns  to
@@ -370,6 +400,100 @@ precedence over environment variables.
 .IP "<\s-1NO_COLORS\s0> \- disable colorization of matches, like \fB\-N\fR" 4
 .IX Item "<NO_COLORS> - disable colorization of matches, like -N"
 .PD
+.SS "\s-1COMPLETION\s0"
+.IX Subsection "COMPLETION"
+Shell completion for command line options  can be enabled by using the
+\&\fB\-\-completion\fR  flag. The  required  parameter is  the  name of  your
+shell. Currently supported are: bash, zsh, fish and powershell.
+.PP
+Detailed instructions:
+.IP "Bash:" 4
+.IX Item "Bash:"
+.Vb 1
+\&   source <(tablizer \-\-completion bash)
+.Ve
+.Sp
+To load completions for each session, execute once:
+.Sp
+.Vb 2
+\&  # Linux:
+\&  $ tablizer \-\-completion bash > /etc/bash_completion.d/tablizer
+\&
+\&  # macOS:
+\&  $ tablizer \-\-completion bash > $(brew \-\-prefix)/etc/bash_completion.d/tablizer
+.Ve
+.IP "Zsh:" 4
+.IX Item "Zsh:"
+If shell completion is not already enabled in your environment,
+you will need to enable it.  You can execute the following once:
+.Sp
+.Vb 1
+\&  echo "autoload \-U compinit; compinit" >> ~/.zshrc
+.Ve
+.Sp
+To load completions for each session, execute once:
+.Sp
+.Vb 1
+\&  $ tablizer \-\-completion zsh > "${fpath[1]}/_tablizer"
+.Ve
+.Sp
+You will need to start a new shell for this setup to take effect.
+.IP "fish:" 4
+.IX Item "fish:"
+.Vb 1
+\&   tablizer \-\-completion fish | source
+.Ve
+.Sp
+To load completions for each session, execute once:
+.Sp
+.Vb 1
+\&   tablizer \-\-completion fish > ~/.config/fish/completions/tablizer.fish
+.Ve
+.IP "PowerShell:" 4
+.IX Item "PowerShell:"
+.Vb 1
+\&   tablizer \-\-completion powershell | Out\-String | Invoke\-Expression
+.Ve
+.Sp
+To load completions for every new session, run:
+.Sp
+.Vb 1
+\&   tablizer \-\-completion powershell > tablizer.ps1
+.Ve
+.Sp
+and source this file from your PowerShell profile.
+.SH "CONFIGURATION AND COLORS"
+.IX Header "CONFIGURATION AND COLORS"
+YOu can put certain configuration values into a configuration file in
+\&\s-1HCL\s0 format. By default tablizer looks for
+\&\f(CW\*(C`$HOME/.config/tablizer/config\*(C'\fR, but you can provide one using the
+parameter \f(CW\*(C`\-f\*(C'\fR.
+.PP
+In the configuration the following variables can be defined:
+.PP
+.Vb 8
+\&    BG             = "lightGreen"
+\&    FG             = "white"
+\&    HighlightBG    = "lightGreen"
+\&    HighlightFG    = "white"
+\&    NoHighlightBG  = "white"
+\&    NoHighlightFG  = "lightGreen"
+\&    HighlightHdrBG = "red"
+\&    HighlightHdrFG = "white"
+.Ve
+.PP
+The following color definitions are available:
+.PP
+black, blue,  cyan, darkGray, default, green,  lightBlue, lightCyan,
+lightGreen,   lightMagenta,   lightRed,   lightWhite,   lightYellow,
+magenta, red, white, yellow
+.PP
+The Variables \fB\s-1FG\s0\fR and \fB\s-1BG\s0\fR are being used to highlight matches. The
+other *FG and *BG variables are for colored table output (enabled with
+the \f(CW\*(C`\-L\*(C'\fR parameter).
+.PP
+Colorization can be turned off completely either by setting the
+parameter \f(CW\*(C`\-N\*(C'\fR or the environment variable \fB\s-1NO_COLOR\s0\fR to a true value.
 .SH "BUGS"
 .IX Header "BUGS"
 In order to report a bug, unexpected behavior, feature requests
@@ -379,15 +503,27 @@ or to submit a patch, please open an issue on github:
 .IX Header "LICENSE"
 This software is licensed under the \s-1GNU GENERAL PUBLIC LICENSE\s0 version 3.
 .PP
-Copyright (c) 2022 by Thomas von Dein
+Copyright (c) 2022\-2024 by Thomas von Dein
 .PP
-This software uses the following \s-1GO\s0 libraries:
+This software uses the following \s-1GO\s0 modules:
 .IP "repr (https://github.com/alecthomas/repr)" 4
 .IX Item "repr (https://github.com/alecthomas/repr)"
 Released under the \s-1MIT\s0 License, Copyright (c) 2016 Alec Thomas
 .IP "cobra (https://github.com/spf13/cobra)" 4
 .IX Item "cobra (https://github.com/spf13/cobra)"
 Released under the Apache 2.0 license, Copyright 2013\-2022 The Cobra Authors
+.IP "dateparse (github.com/araddon/dateparse)" 4
+.IX Item "dateparse (github.com/araddon/dateparse)"
+Released under the \s-1MIT\s0 License, Copyright (c) 2015\-2017 Aaron Raddon
+.IP "color (github.com/gookit/color)" 4
+.IX Item "color (github.com/gookit/color)"
+Released under the \s-1MIT\s0 License, Copyright (c) 2016 inhere
+.IP "tablewriter (github.com/olekukonko/tablewriter)" 4
+.IX Item "tablewriter (github.com/olekukonko/tablewriter)"
+Released under the \s-1MIT\s0 License, Copyright (c) 201 by Oleku Konko
+.IP "yaml (gopkg.in/yaml.v3)" 4
+.IX Item "yaml (gopkg.in/yaml.v3)"
+Released under the \s-1MIT\s0 License, Copyright (c) 2006\-2011 Kirill Simonov
 .SH "AUTHORS"
 .IX Header "AUTHORS"
 Thomas von Dein \fBtom \s-1AT\s0 vondein \s-1DOT\s0 org\fR
--- a/tablizer.pod
+++ b/tablizer.pod
@@ -12,17 +12,21 @@ tablizer - Manipulate tabular output of other programs
      -v, --invert-match       select non-matching rows
      -n, --no-numbering       Disable header numbering
      -N, --no-color           Disable pattern highlighting
+      -H, --no-headers         Disable headers display
      -s, --separator string   Custom field separator
      -k, --sort-by int        Sort by column (default: 1)
+      -z, --fuzzy              Use fuzzy search [experimental]
+      -F, --filter field=reg   Filter given field with regex, can be used multiple times

    Output Flags (mutually exclusive):
      -X, --extended           Enable extended output
      -M, --markdown           Enable markdown table output
      -O, --orgtbl             Enable org-mode table output
-      -S, --shell              Enable shell evaluable ouput
+      -S, --shell              Enable shell evaluable output
      -Y, --yaml               Enable yaml output
      -C, --csv                Enable CSV output
      -A, --ascii              Default output mode, ascii tabular
+      -L, --hightlight-lines   Use alternating background colors for tables

    Sort Mode Flags (mutually exclusive):
      -a, --sort-age           sort according to age (duration) string
@@ -31,10 +35,12 @@ tablizer - Manipulate tabular output of other programs
      -t, --sort-time          sort according to time string

    Other Flags:
+          --completion <shell> Generate the autocompletion script for <shell>
+      -f, --config <file>      Configuration file (default: ~/.config/tablizer/config)
      -d, --debug              Enable debugging
      -h, --help               help for tablizer
      -m, --man                Display manual page
-      -v, --version            Print program version
+      -V, --version            Print program version


 =head1 DESCRIPTION
@@ -89,6 +95,11 @@ the original order.

 The numbering can be suppressed by using the B<-n> option.

+By  default tablizer  shows  a  header containing  the  names of  each
+column.  This can  be disabled using the B<-H> option.   Be aware that
+this only affects tabular output modes.  Shell, Extended, Yaml and CSV
+output modes always use the column names.
+
 By  default, if  a  B<pattern>  has been  speficied,  matches will  be
 highlighted. You can disable this behavior with the B<-N> option.

@@ -118,7 +129,7 @@ Sorts timestamps.
 Finally the  B<-d> option  enables debugging  output which  is mostly
 useful for the developer.

-=head2 PATTERNS
+=head2 PATTERNS AND FILTERING

 You can reduce the rows being  displayed by using a regular expression
 pattern.  The  regexp is  PCRE compatible, refer  to the  syntax cheat
@@ -145,6 +156,23 @@ Example for a case insensitive search:

    kubectl get pods -A | tablizer "(?i)account"

+You  can use  the experimental  fuzzy search  feature by  providing the
+option B<-z>, in which case the  pattern is regarded as a fuzzy search
+term, not a regexp.
+
+Sometimes you want to  filter by one or more columns.  You can do that
+using the B<-F> option. The option can be specified multiple times and
+has the following format:
+
+    fieldname=regexp
+
+Fieldnames (== columns headers) are case insensitive.
+
+If you specify more than one filter, both filters have to match (AND
+operation).
+
+If the option B<-v> is specified, the filtering is inverted.
+

 =head2 COLUMNS

@@ -227,6 +255,91 @@ precedence over environment variables.

 =back

+=head2 COMPLETION
+
+Shell completion for command line options  can be enabled by using the
+B<--completion>  flag. The  required  parameter is  the  name of  your
+shell. Currently supported are: bash, zsh, fish and powershell.
+
+Detailed instructions:
+
+=over
+
+=item Bash:
+
+   source <(tablizer --completion bash)
+
+To load completions for each session, execute once:
+
+  # Linux:
+  $ tablizer --completion bash > /etc/bash_completion.d/tablizer
+
+  # macOS:
+  $ tablizer --completion bash > $(brew --prefix)/etc/bash_completion.d/tablizer
+
+=item Zsh:
+
+If shell completion is not already enabled in your environment,
+you will need to enable it.  You can execute the following once:
+
+  echo "autoload -U compinit; compinit" >> ~/.zshrc
+
+To load completions for each session, execute once:
+
+  $ tablizer --completion zsh > "${fpath[1]}/_tablizer"
+
+You will need to start a new shell for this setup to take effect.
+
+=item fish:
+
+   tablizer --completion fish | source
+
+To load completions for each session, execute once:
+
+   tablizer --completion fish > ~/.config/fish/completions/tablizer.fish
+
+=item PowerShell:
+
+   tablizer --completion powershell | Out-String | Invoke-Expression
+
+To load completions for every new session, run:
+
+   tablizer --completion powershell > tablizer.ps1
+
+and source this file from your PowerShell profile.
+
+=back
+
+=head1 CONFIGURATION AND COLORS
+
+YOu can put certain configuration values into a configuration file in
+HCL format. By default tablizer looks for
+C<$HOME/.config/tablizer/config>, but you can provide one using the
+parameter C<-f>.
+
+In the configuration the following variables can be defined:
+
+    BG             = "lightGreen"
+    FG             = "white"
+    HighlightBG    = "lightGreen"
+    HighlightFG    = "white"
+    NoHighlightBG  = "white"
+    NoHighlightFG  = "lightGreen"
+    HighlightHdrBG = "red"
+    HighlightHdrFG = "white"
+
+The following color definitions are available:
+
+black, blue,  cyan, darkGray, default, green,  lightBlue, lightCyan,
+lightGreen,   lightMagenta,   lightRed,   lightWhite,   lightYellow,
+magenta, red, white, yellow
+
+The Variables B<FG> and B<BG> are being used to highlight matches. The
+other *FG and *BG variables are for colored table output (enabled with
+the C<-L> parameter).
+
+Colorization can be turned off completely either by setting the
+parameter C<-N> or the environment variable B<NO_COLOR> to a true value.

 =head1 BUGS

@@ -238,9 +351,9 @@ L<https://github.com/TLINDEN/tablizer/issues>.

 This software is licensed under the GNU GENERAL PUBLIC LICENSE version 3.

-Copyright (c) 2022 by Thomas von Dein
+Copyright (c) 2022-2024 by Thomas von Dein

-This software uses the following GO libraries:
+This software uses the following GO modules:

 =over 4

@@ -252,6 +365,22 @@ Released under the MIT License, Copyright (c) 2016 Alec Thomas

 Released under the Apache 2.0 license, Copyright 2013-2022 The Cobra Authors

+=item dateparse (github.com/araddon/dateparse)
+
+Released under the MIT License, Copyright (c) 2015-2017 Aaron Raddon
+
+=item color (github.com/gookit/color)
+
+Released under the MIT License, Copyright (c) 2016 inhere
+
+=item tablewriter (github.com/olekukonko/tablewriter)
+
+Released under the MIT License, Copyright (c) 201 by Oleku Konko
+
+=item yaml (gopkg.in/yaml.v3)
+
+Released under the MIT License, Copyright (c) 2006-2011 Kirill Simonov
+
 =back

 =head1 AUTHORS
Author	SHA1	Message	Date
Thomas von Dein	4dc87ac22e	fix #27 : check if parsed headers and columns match	2024-11-04 11:13:53 +01:00
Thomas von Dein	ef5211e45f	only works on 1.22	2024-09-27 11:15:23 +02:00
Thomas von Dein	1a80e72737	fix version quoting	2024-09-27 11:04:32 +02:00
Thomas von Dein	8e765b167f	ok, only test with 1.22.1	2024-09-25 18:55:04 +02:00
Thomas von Dein	30f4b67538	bump version and add current go versions for testing	2024-09-25 18:52:47 +02:00
Thomas von Dein	383b5db47e	try 1.22.1	2024-09-25 18:40:13 +02:00
Thomas von Dein	f7d812b372	try to quote go version	2024-09-25 18:38:06 +02:00
Thomas von Dein	480f5f617d	only try 1.20	2024-09-25 18:33:46 +02:00
Thomas von Dein	586e36c181	update to go 1.22	2024-09-25 18:24:35 +02:00
dependabot[bot]	13c789b800	Bump github.com/alecthomas/repr from 0.1.1 to 0.4.0 Bumps [github.com/alecthomas/repr](https://github.com/alecthomas/repr) from 0.1.1 to 0.4.0. - [Commits](https://github.com/alecthomas/repr/compare/v0.1.1...v0.4.0) --- updated-dependencies: - dependency-name: github.com/alecthomas/repr dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 18:22:10 +02:00
dependabot[bot]	81e1394fd2	Bump github.com/gookit/color from 1.5.2 to 1.5.4 Bumps [github.com/gookit/color](https://github.com/gookit/color) from 1.5.2 to 1.5.4. - [Release notes](https://github.com/gookit/color/releases) - [Commits](https://github.com/gookit/color/compare/v1.5.2...v1.5.4) --- updated-dependencies: - dependency-name: github.com/gookit/color dependency-type: direct:production update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 18:22:00 +02:00
dependabot[bot]	b8099fe389	Bump github.com/spf13/cobra from 1.6.1 to 1.8.1 Bumps [github.com/spf13/cobra](https://github.com/spf13/cobra) from 1.6.1 to 1.8.1. - [Release notes](https://github.com/spf13/cobra/releases) - [Commits](https://github.com/spf13/cobra/compare/v1.6.1...v1.8.1) --- updated-dependencies: - dependency-name: github.com/spf13/cobra dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 18:21:46 +02:00
dependabot[bot]	1dc072aa67	Bump github.com/lithammer/fuzzysearch from 1.1.7 to 1.1.8 Bumps [github.com/lithammer/fuzzysearch](https://github.com/lithammer/fuzzysearch) from 1.1.7 to 1.1.8. - [Release notes](https://github.com/lithammer/fuzzysearch/releases) - [Commits](https://github.com/lithammer/fuzzysearch/compare/v1.1.7...v1.1.8) --- updated-dependencies: - dependency-name: github.com/lithammer/fuzzysearch dependency-type: direct:production update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 18:21:23 +02:00
dependabot[bot]	d92f63ca30	Bump github.com/hashicorp/hcl/v2 from 2.19.1 to 2.22.0 Bumps [github.com/hashicorp/hcl/v2](https://github.com/hashicorp/hcl) from 2.19.1 to 2.22.0. - [Release notes](https://github.com/hashicorp/hcl/releases) - [Changelog](https://github.com/hashicorp/hcl/blob/main/CHANGELOG.md) - [Commits](https://github.com/hashicorp/hcl/compare/v2.19.1...v2.22.0) --- updated-dependencies: - dependency-name: github.com/hashicorp/hcl/v2 dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 18:13:50 +02:00
Thomas von Dein	78ccb8f54b	use non format logger	2024-09-25 18:06:00 +02:00
Thomas von Dein	a29104aeab	fix typos in issue templates	2024-09-25 18:06:00 +02:00
dependabot[bot]	45d9e219a5	Bump golangci/golangci-lint-action from 3 to 6 Bumps [golangci/golangci-lint-action](https://github.com/golangci/golangci-lint-action) from 3 to 6. - [Release notes](https://github.com/golangci/golangci-lint-action/releases) - [Commits](https://github.com/golangci/golangci-lint-action/compare/v3...v6) --- updated-dependencies: - dependency-name: golangci/golangci-lint-action dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 16:40:10 +02:00
dependabot[bot]	3eda59beeb	Bump actions/checkout from 3 to 4 Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4. - [Release notes](https://github.com/actions/checkout/releases) - [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md) - [Commits](https://github.com/actions/checkout/compare/v3...v4) --- updated-dependencies: - dependency-name: actions/checkout dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 16:39:58 +02:00
dependabot[bot]	7ada75c1d6	Bump actions/setup-go from 3 to 5 Bumps [actions/setup-go](https://github.com/actions/setup-go) from 3 to 5. - [Release notes](https://github.com/actions/setup-go/releases) - [Commits](https://github.com/actions/setup-go/compare/v3...v5) --- updated-dependencies: - dependency-name: actions/setup-go dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 16:39:36 +02:00
Thomas von Dein	83d5628430	add dependabot config	2024-09-25 16:33:54 +02:00
Thomas von Dein	a9bb79b01c	merge corrections	2024-05-07 18:39:38 +02:00
Thomas von Dein	a718fa388d	Merge remote-tracking branch 'origin/development'	2024-05-07 18:29:01 +02:00
Thomas von Dein	473feff451	refactored and un-go-criticed	2024-05-07 18:01:12 +02:00
Thomas von Dein	9e2e45715e	added -F docs	2024-05-07 18:00:57 +02:00
Thomas von Dein	39609425e5	refactoring and gouncritic, 1st part	2024-05-07 15:19:54 +02:00
Thomas von Dein	ba2a2e8460	add -F filter by column flag (closes #13 )	2024-05-07 13:30:07 +02:00
Thomas von Dein	96f7881c16	fix #12 : only consider -v if there's a pattern, ignore it otherwise	2024-05-07 13:29:41 +02:00
T.v.Dein	6fccd1287b	Feature additions (#11 ) * add color table support (using alternating colorization of rows) using new flag `-L` * add config file support (HCL format) using `~/.config/tablizer/config` or `-f <file>` so the user can customize colors * removed golang 1.17 support	2023-11-22 14:16:43 +01:00
Thomas von Dein	0f22457961	remove go 1.17 support	2023-11-22 14:09:49 +01:00
Thomas von Dein	ddfbecaa35	+docs, try linter v1.18	2023-11-22 14:08:36 +01:00
Thomas von Dein	3632de10d7	try to fix linter	2023-11-22 13:57:57 +01:00
Thomas von Dein	76b98fb8ad	upd mods	2023-11-22 13:48:32 +01:00
Thomas von Dein	f045adf441	added config file support to set custom colors	2023-11-22 13:33:26 +01:00
Thomas von Dein	811173ddb4	fixed alternating highlighting, now looks reasonable	2023-11-22 10:30:40 +01:00
Thomas von Dein	3c910ca08f	works but is ugly :(	2023-11-21 17:41:04 +01:00
Thomas von Dein	a8c9ede77e	added -L flag to highligh lines in alternating bg color	2023-11-21 11:40:55 +01:00
T.v.Dein	9eadb941da	Release v1.0.17 (#9 ) * add shortcut -H to --no-headers, it's too cumbersome to type * added fuzzy search support * Added basic lisp plugin facilities * Lisp plugin Addidions: - added process hook facilities - added working example lisp plugin for filter hook - load-path can now be a file as well - added a couple of lisp helper functions (atoi, split), more may follow, see lisplib.go * linting fixes	2023-10-02 18:15:41 +02:00
T.v.Dein	93800f81c1	release v1.0.16 (#8 ) * add shortcut -H to --no-headers, it's too cumbersome to type * bump version * add -H to usage * re-generated --------- Co-authored-by: Thomas von Dein <tom@vondein.org>	2023-05-03 18:31:28 +02:00
T.v.Dein	a94a4fd5b0	Merge pull request #7 from TLINDEN/development added --no-headers flag to disable header display in tabular modes	2023-04-21 10:01:19 +02:00
Thomas von Dein	1acbdbc674	added --no-headers flag to disable header display in tabular modes	2023-04-21 09:52:05 +02:00
Thomas von Dein	195f685584	fix release maker	2023-01-23 13:40:50 +01:00
Thomas von Dein	b72a99748f	upd Changelog, bump version	2023-01-23 12:38:59 +01:00
Thomas von Dein	3cf9310ef7	-D could not be used together with -a	2023-01-20 13:37:06 +01:00
Thomas von Dein	ceae80c91c	fix invalid arg handling (io, stdin) and add tests for this	2023-01-09 12:54:45 +01:00
Thomas von Dein	54add2c801	only upd patch version if any	2022-11-04 20:27:22 +01:00
Thomas von Dein	2d157bf2c0	force uniseg release version, see actions#3396457307/	2022-11-04 20:22:51 +01:00
Thomas von Dein	6f71a028f0	added licenses	2022-11-04 20:22:40 +01:00
Thomas von Dein	dfc7c2e03e	upd dep licenses, upd go modules	2022-11-04 20:10:54 +01:00
Thomas von Dein	c443914222	fix spacing mess	2022-11-03 20:17:02 +01:00
Thomas von Dein	eddd4e4180	add feature request template	2022-11-03 20:12:26 +01:00
Thomas von Dein	0d05505493	Merge branch 'main' into development	2022-11-03 20:09:10 +01:00
T.v.Dein	a461dba10d	Merge pull request #6 from TLINDEN/issue-template Update issue templates	2022-11-03 20:08:42 +01:00
T.v.Dein	ca71f8a572	Update issue templates	2022-11-03 19:59:19 +01:00
Thomas von Dein	60230eb1f6	added show-version target	2022-11-03 19:51:42 +01:00
Thomas von Dein	315e8d5363	fix changelog	2022-11-03 19:30:55 +01:00
Thomas von Dein	88d078a535	fix to be able to run 'make' on systems w/o perl	2022-11-03 19:26:57 +01:00
Thomas von Dein	74ab3a1804	version bump	2022-11-03 13:16:02 +01:00
Thomas von Dein	2d8614fa0f	demo gif	2022-11-03 13:11:09 +01:00
Thomas von Dein	c8bad4df1a	check completion errors	2022-11-02 14:33:48 +01:00
Thomas von Dein	335b2665f2	turned completion subcommand into option	2022-11-01 11:40:36 +01:00
Thomas von Dein	8552270a68	added completion support	2022-10-31 16:19:12 +01:00
Thomas von Dein	6f49b76607	added demo generator	2022-10-27 19:24:22 +02:00
Thomas von Dein	4653eaca09	added demo generator	2022-10-27 19:23:48 +02:00
Thomas von Dein	722eea7e7b	add asciicast demo	2022-10-27 19:22:36 +02:00
Thomas von Dein	304f2182ac	js doesnt work, try image	2022-10-27 19:18:09 +02:00
Thomas von Dein	73908b1661	added ascii cast	2022-10-27 19:16:41 +02:00
Thomas von Dein	105ba96757	-A was not implemented, oops!	2022-10-27 18:38:46 +02:00
Thomas von Dein	0681f67bc6	fix release link	2022-10-26 12:38:08 +02:00