fixed pattern regex, fixed pattern AND operation

Bumps [github.com/hashicorp/hcl/v2](https://github.com/hashicorp/hcl) from 2.22.0 to 2.23.0.
- [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/v2.22.0...v2.23.0)

---
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>

.github/workflows/ci.yaml

@@ -5,7 +5,9 @@ jobs:
     strategy:
       matrix:
         version: ['1.22']
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        # windows-latest removed, see:
+        # https://github.com/rogpeppe/go-internal/issues/284
+        os: [ubuntu-latest, macos-latest]
     name: Build
     runs-on: ${{ matrix.os }}
     steps:

.github/workflows/release.yaml

@@ -0,0 +1,32 @@
+name: build-and-test
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  release:
+    name: Build Release Assets
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set up Go
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.22.11
+
+      - name: Build the executables
+        run: ./mkrel.sh tablizer ${{ github.ref_name}}
+
+      - name: List the executables
+        run: ls -l ./releases
+
+      - name: Upload the binaries
+        uses: svenstaro/upload-release-action@v2
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          tag: ${{ github.ref_name }}
+          file: ./releases/*
+          file_glob: true

.gitignore

@@ -1,2 +1,3 @@
 releases
 tablizer
+*.out

Makefile

@@ -53,8 +53,7 @@ buildlocal:
 	go build -ldflags "-X 'github.com/tlinden/tablizer/cfg.VERSION=$(VERSION)'"
 
 release:
-	./mkrel.sh $(tool) $(version)
+	gh release create $(version) --generate-notes
-	gh release create $(version) --generate-notes releases/*
 
 install: buildlocal
 	install -d -o $(UID) -g $(GID) $(PREFIX)/bin
@@ -66,11 +65,10 @@ clean:
 	rm -rf $(tool) releases coverage.out
 
 test:
-	go test -v ./...
+	go test ./... $(OPTS)
-	bash t/test.sh
 
 singletest:
-	@echo "Call like this: ''make singletest TEST=TestPrepareColumns MOD=lib"
+	@echo "Call like this: 'make singletest TEST=TestPrepareColumns MOD=lib'"
 	go test -run $(TEST) github.com/tlinden/tablizer/$(MOD)
 
 cover-report:

README.md

@@ -8,6 +8,49 @@ Tablizer  can   be  used   to  re-format   tabular  output   of  other
 programs. While you  could do this using standard unix  tools, in some
 cases it's a hard job.
 
+Usage:
+```default
+Usage:
+  tablizer [regex] [file, ...] [flags]
+
+Operational Flags:
+  -c, --columns string              Only show the speficied columns (separated by ,)
+  -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
+  -T, --transpose-columns string    Transpose the speficied columns (separated by ,)
+  -R, --regex-transposer /from/to/  Apply /search/replace/ regexp to fields given in -T
+
+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 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
+  -D, --sort-desc                   Sort in descending order (default: ascending)
+  -i, --sort-numeric                sort according to string numerical value
+  -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
+```
+
 Let's take this output:
 ```
 % kubectl get pods -o wide
@@ -83,6 +126,23 @@ otherwise on all rows.
 
 There are more output modes like org-mode (orgtbl) and markdown.
 
+You can also use it to modify certain cells using regular expression
+matching. For example:
+
+```shell
+kubectl get pods | tablizer -n -T4 -R '/ /-/'
+NAME                            READY   STATUS  RESTARTS        AGE
+repldepl-7bcd8d5b64-7zq4l       1/1     Running 1-(69m-ago)     5h26m
+repldepl-7bcd8d5b64-m48n8       1/1     Running 1-(69m-ago)     5h26m
+repldepl-7bcd8d5b64-q2bf4       1/1     Running 1-(69m-ago)     5h26m
+```
+
+Here, we modified the 4th column (`-T4`) by replacing every space with
+a dash. If you need to work with `/` characters, you can also use any
+other separator, for instance: `-R '| |-|'`.
+
+
+
 ## Demo
 
 [![asciicast](demo/tablizer-demo.gif)](https://asciinema.org/a/9FKc3HPnlg8D2X8otheleEa9t)
@@ -138,6 +198,41 @@ In order to report a bug, unexpected behavior, feature requests
 or to submit a patch, please open an issue on github:
 https://github.com/TLINDEN/tablizer/issues.
 
+## Prior Art
+
+When I started with tablizer I was not aware that other tools
+exist. Here is a non-exhausive list of the ones I find especially
+awesome:
+
+### [miller](https://github.com/johnkerl/miller)
+
+This is a really powerful tool to work with tabular data and it also
+allows other inputs as json, csv etc. You can filter, manipulate,
+create pipelines, there's even a programming language builtin to do
+even more amazing things.
+
+### [csvq](https://github.com/mithrandie/csvq)
+
+Csvq allows you to query CSV and TSV data using SQL queries. How nice
+is that? Highly recommended if you have to work with a large (and
+wide) dataset and need to apply a complicated set of rules.
+
+### [goawk](https://github.com/benhoyt/goawk)
+
+Goawk is a 100% POSIX compliant AWK implementation in GO, which also
+supports CSV and TSV data as input (using `-i csv` for example). You
+can apply any kind of awk code to your tabular data, there are no
+limit to your creativity!
+
+### [teip](https://github.com/greymd/teip)
+
+I particularly like teip, it's a real gem. You can use it to drill
+"holes" into your tabular data and modify these "holes" using small
+external unix commands such as grep or sed. The possibilities are
+endless, you can even use teip to modify data inside a hole created by
+teip. Highly recommended.
+
+
 ## Copyright and license
 
 This software is licensed under the GNU GENERAL PUBLIC LICENSE version 3.

TODO.md

@@ -6,13 +6,3 @@
 
 - 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   |

cfg/config.go

@@ -23,16 +23,14 @@ import (
 	"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 = "v1.2.3"
+const Version string = "v1.3.1"
 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
@@ -49,6 +47,17 @@ type Settings struct {
 	HighlightHdrBG string `hcl:"HighlightHdrBG"`
 }
 
+type Transposer struct {
+	Search  regexp.Regexp
+	Replace string
+}
+
+type Pattern struct {
+	Pattern   string
+	PatternRe *regexp.Regexp
+	Negate    bool
+}
+
 // internal config
 type Config struct {
 	Debug          bool
@@ -59,14 +68,19 @@ type Config struct {
 	Separator      string
 	OutputMode     int
 	InvertMatch    bool
-	Pattern        string
+	Patterns       []*Pattern
-	PatternR       *regexp.Regexp
 	UseFuzzySearch bool
 	UseHighlight   bool
 
-	SortMode       string
+	SortMode        string
-	SortDescending bool
+	SortDescending  bool
-	SortByColumn   int
+	SortByColumn    string // 1,2
+	UseSortByColumn []int  // []int{1,2}
+
+	TransposeColumns    string       // 1,2
+	UseTransposeColumns []int        // []int{1,2}
+	Transposers         []string     // []string{"/ /-/", "/foo/bar/"}
+	UseTransposers      []Transposer // {Search: re, Replace: string}
 
 	/*
 	 FIXME: make configurable somehow, config file or ENV
@@ -79,13 +93,6 @@ type Config struct {
 
 	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
 
@@ -94,6 +101,9 @@ type Config struct {
 	// used for field filtering
 	Rawfilters []string
 	Filters    map[string]*regexp.Regexp
+
+	// -r <file>
+	InputFile string
 }
 
 // maps outputmode short flags to output mode, ie. -O => -o orgtbl
@@ -125,9 +135,6 @@ type Sortmode struct {
 	Age     bool
 }
 
-// valid lisp hooks
-var ValidHooks []string
-
 // default color schemes
 func (conf *Config) Colors() map[color.Level]map[string]color.Color {
 	colors := map[color.Level]map[string]color.Color{
@@ -277,7 +284,30 @@ func (conf *Config) PrepareFilters() error {
 				parts[0], err)
 		}
 
-		conf.Filters[strings.ToLower(parts[0])] = reg
+		conf.Filters[strings.ToLower(strings.ToLower(parts[0]))] = reg
+	}
+
+	return nil
+}
+
+// check if transposers match transposer columns and prepare transposer structs
+func (conf *Config) PrepareTransposers() error {
+	if len(conf.Transposers) != len(conf.UseTransposeColumns) {
+		return fmt.Errorf("the number of transposers needs to correspond to the number of transpose columns: %d != %d",
+			len(conf.Transposers), len(conf.UseTransposeColumns))
+	}
+
+	for _, transposer := range conf.Transposers {
+		parts := strings.Split(transposer, string(transposer[0]))
+		if len(parts) != 4 {
+			return fmt.Errorf("transposer function must have the format /regexp/replace-string/")
+		}
+
+		conf.UseTransposers = append(conf.UseTransposers,
+			Transposer{
+				Search:  *regexp.MustCompile(parts[1]),
+				Replace: parts[2]},
+		)
 	}
 
 	return nil
@@ -306,19 +336,39 @@ func (conf *Config) ApplyDefaults() {
 	if conf.OutputMode == Yaml || conf.OutputMode == CSV {
 		conf.NoNumbering = true
 	}
-
-	ValidHooks = []string{"filter", "process", "transpose", "append"}
 }
 
-func (conf *Config) PreparePattern(pattern string) error {
+func (conf *Config) PreparePattern(patterns []*Pattern) error {
-	PatternR, err := regexp.Compile(pattern)
+	// regex checks if a pattern looks like /$pattern/[i!]
+	flagre := regexp.MustCompile(`^/(.*)/([i!]*)$`)
 
-	if err != nil {
+	for _, pattern := range patterns {
-		return fmt.Errorf("regexp pattern %s is invalid: %w", conf.Pattern, err)
+		matches := flagre.FindAllStringSubmatch(pattern.Pattern, -1)
+
+		// we have a regex with flags
+		for _, match := range matches {
+			pattern.Pattern = match[1] // the inner part is our actual pattern
+			flags := match[2]          // the flags
+
+			for _, flag := range flags {
+				switch flag {
+				case 'i':
+					pattern.Pattern = `(?i)` + pattern.Pattern
+				case '!':
+					pattern.Negate = true
+				}
+			}
+		}
+
+		PatternRe, err := regexp.Compile(pattern.Pattern)
+		if err != nil {
+			return fmt.Errorf("regexp pattern %s is invalid: %w", pattern.Pattern, err)
+		}
+
+		pattern.PatternRe = PatternRe
 	}
 
-	conf.PatternR = PatternR
+	conf.Patterns = patterns
-	conf.Pattern = pattern
 
 	return nil
 }

cfg/config_test.go

@@ -79,20 +79,55 @@ func TestPrepareSortFlags(t *testing.T) {
 
 func TestPreparePattern(t *testing.T) {
 	var tests = []struct {
-		pattern string
+		patterns  []*Pattern
-		wanterr bool
+		name      string
+		wanterr   bool
+		wanticase bool
+		wantneg   bool
 	}{
-		{"[A-Z]+", false},
+		{
-		{"[a-z", true},
+			[]*Pattern{{Pattern: "[A-Z]+"}},
+			"simple",
+			false,
+			false,
+			false,
+		},
+		{
+			[]*Pattern{{Pattern: "[a-z"}},
+			"regfail",
+			true,
+			false,
+			false,
+		},
+		{
+			[]*Pattern{{Pattern: "/[A-Z]+/i"}},
+			"icase",
+			false,
+			true,
+			false,
+		},
+		{
+			[]*Pattern{{Pattern: "/[A-Z]+/!"}},
+			"negate",
+			false,
+			false,
+			true,
+		},
+		{
+			[]*Pattern{{Pattern: "/[A-Z]+/!i"}},
+			"negicase",
+			false,
+			true,
+			true,
+		},
 	}
 
 	for _, testdata := range tests {
-		testname := fmt.Sprintf("PreparePattern-pattern-%s-wanterr-%t",
+		testname := fmt.Sprintf("PreparePattern-pattern-%s-wanterr-%t", testdata.name, testdata.wanterr)
-			testdata.pattern, testdata.wanterr)
 		t.Run(testname, func(t *testing.T) {
 			conf := Config{}
 
-			err := conf.PreparePattern(testdata.pattern)
+			err := conf.PreparePattern(testdata.patterns)
 
 			if err != nil {
 				if !testdata.wanterr {

cmd/root.go

@@ -117,9 +117,6 @@ func Execute() {
 			conf.DetermineColormode()
 			conf.ApplyDefaults()
 
-			// setup lisp env, load plugins etc
-			wrapE(lib.SetupLisp(&conf))
-
 			// actual execution starts here
 			wrapE(lib.ProcessFiles(&conf, args))
 		},
@@ -150,9 +147,11 @@ func Execute() {
 		"Custom field separator")
 	rootCmd.PersistentFlags().StringVarP(&conf.Columns, "columns", "c", "",
 		"Only show the speficied columns (separated by ,)")
+	rootCmd.PersistentFlags().StringVarP(&conf.TransposeColumns, "transpose-columns", "T", "",
+		"Transpose the speficied columns (separated by ,)")
 
 	// sort options
-	rootCmd.PersistentFlags().IntVarP(&conf.SortByColumn, "sort-by", "k", 0,
+	rootCmd.PersistentFlags().StringVarP(&conf.SortByColumn, "sort-by", "k", "",
 		"Sort by column (default: 1)")
 
 	// sort mode, only 1 allowed
@@ -185,16 +184,19 @@ func Execute() {
 	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.PersistentFlags().StringArrayVarP(&conf.Rawfilters,
+		"filter", "F", nil, "Filter by field (field=regexp)")
+	rootCmd.PersistentFlags().StringArrayVarP(&conf.Transposers,
+		"regex-transposer", "R", nil, "apply /search/replace/ regexp to fields given in -T")
+
+	// input
+	rootCmd.PersistentFlags().StringVarP(&conf.InputFile, "read-file", "r", "",
+		"Read input data from file")
 
 	rootCmd.SetUsageTemplate(strings.TrimSpace(usage) + "\n")
 

cmd/tablizer.go

@@ -6,42 +6,44 @@ NAME
 
 SYNOPSIS
         Usage:
-          tablizer [regex] [file, ...] [flags]
+          tablizer [regex,...] [file, ...] [flags]
     
         Operational Flags:
-          -c, --columns string     Only show the speficied columns (separated by ,)
+          -c, --columns string              Only show the speficied columns (separated by ,)
-          -v, --invert-match       select non-matching rows
+          -v, --invert-match                select non-matching rows
-          -n, --no-numbering       Disable header numbering
+          -n, --no-numbering                Disable header numbering
-          -N, --no-color           Disable pattern highlighting
+          -N, --no-color                    Disable pattern highlighting
-          -H, --no-headers         Disable headers display
+          -H, --no-headers                  Disable headers display
-          -s, --separator string   Custom field separator
+          -s, --separator string            Custom field separator
-          -k, --sort-by int        Sort by column (default: 1)
+          -k, --sort-by int|name            Sort by column (default: 1)
-          -z, --fuzzy              Use fuzzy search [experimental]
+          -z, --fuzzy                       Use fuzzy search [experimental]
-          -F, --filter field=reg   Filter given field with regex, can be used multiple times
+          -F, --filter field=reg            Filter given field with regex, can be used multiple times
+          -T, --transpose-columns string    Transpose the speficied columns (separated by ,)
+          -R, --regex-transposer /from/to/  Apply /search/replace/ regexp to fields given in -T
 
         Output Flags (mutually exclusive):
-          -X, --extended           Enable extended output
+          -X, --extended                    Enable extended output
-          -M, --markdown           Enable markdown table output
+          -M, --markdown                    Enable markdown table output
-          -O, --orgtbl             Enable org-mode table output
+          -O, --orgtbl                      Enable org-mode table output
-          -S, --shell              Enable shell evaluable output
+          -S, --shell                       Enable shell evaluable output
-          -Y, --yaml               Enable yaml output
+          -Y, --yaml                        Enable yaml output
-          -C, --csv                Enable CSV output
+          -C, --csv                         Enable CSV output
-          -A, --ascii              Default output mode, ascii tabular
+          -A, --ascii                       Default output mode, ascii tabular
-          -L, --hightlight-lines   Use alternating background colors for tables
+          -L, --hightlight-lines            Use alternating background colors for tables
 
         Sort Mode Flags (mutually exclusive):
-          -a, --sort-age           sort according to age (duration) string
+          -a, --sort-age                    sort according to age (duration) string
-          -D, --sort-desc          Sort in descending order (default: ascending)
+          -D, --sort-desc                   Sort in descending order (default: ascending)
-          -i, --sort-numeric       sort according to string numerical value
+          -i, --sort-numeric                sort according to string numerical value
-          -t, --sort-time          sort according to time string
+          -t, --sort-time                   sort according to time string
 
         Other Flags:
-              --completion <shell> Generate the autocompletion script for <shell>
+              --completion <shell>         Generate the autocompletion script for <shell>
-          -f, --config <file>      Configuration file (default: ~/.config/tablizer/config)
+          -f, --config <file>              Configuration file (default: ~/.config/tablizer/config)
-          -d, --debug              Enable debugging
+          -d, --debug                      Enable debugging
-          -h, --help               help for tablizer
+          -h, --help                       help for tablizer
-          -m, --man                Display manual page
+          -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
@@ -101,10 +103,19 @@ DESCRIPTION
     highlighted. You can disable this behavior with the -N option.
 
     Use the -k option to specify by which column to sort the tabular data
-    (as in GNU sort(1)). The default sort column is the first one. To
+    (as in GNU sort(1)). The default sort column is the first one. You can
-    disable sorting at all, supply 0 (Zero) to -k. The default sort order is
+    specify column numbers or names. Column numbers start with 1, names are
-    ascending. You can change this to descending order using the option -D.
+    case insensitive. You can specify multiple columns separated by comma to
-    The default sort order is by string, but there are other sort modes:
+    sort, but the type must be the same. For example if you want to sort
+    numerically, all columns must be numbers. If you use column numbers,
+    then be aware, that these are the numbers before column extraction. For
+    example if you have a table with 4 columns and specify "-c4", then only
+    1 column (the fourth) will be printed, however if you want to sort by
+    this column, you'll have to specify "-k4".
+
+    The default sort order is ascending. You can change this to descending
+    order using the option -D. The default sort order is by alphanumeric
+    string, but there are other sort modes:
 
     -a --sort-age
         Sorts duration strings like "1d4h32m51s".
@@ -119,30 +130,43 @@ DESCRIPTION
     for the developer.
 
   PATTERNS AND FILTERING
-    You can reduce the rows being displayed by using a regular expression
+    You can reduce the rows being displayed by using one or more regular
-    pattern. The regexp is PCRE compatible, refer to the syntax cheat sheet
+    expression patterns. The regexp language being used is the one of
-    here: <https://github.com/google/re2/wiki/Syntax>. If you want to read a
+    GOLANG, refer to the syntax cheat sheet here:
-    more comprehensive documentation about the topic and have perl installed
+    <https://pkg.go.dev/regexp/syntax>.
-    you can read it with:
+
+    If you want to read a more comprehensive documentation about the topic
+    and have perl installed you can read it with:
 
         perldoc perlre
 
-    Or read it online: <https://perldoc.perl.org/perlre>.
+    Or read it online: <https://perldoc.perl.org/perlre>. But please note
+    that the GO regexp engine does NOT support all perl regex terms,
+    especially look-ahead and look-behind.
 
-    A note on modifiers: the regexp engine used in tablizer uses another
+    If you want to supply flags to a regex, then surround it with slashes
-    modifier syntax:
+    and append the flag. The following flags are supported:
 
-        (?MODIFIER)
+        i => case insensitive
-
+        ! => negative match
-    The most important modifiers are:
-
-    "i" ignore case "m" multiline mode "s" single line mode
 
     Example for a case insensitive search:
 
-        kubectl get pods -A | tablizer "(?i)account"
+        kubectl get pods -A | tablizer "/account/i"
 
-    You can use the experimental fuzzy search feature by providing the
+    If you use the "!" flag, then the regex match will be negated, that is,
+    if a line in the input matches the given regex, but "!" is supplied,
+    tablizer will NOT include it in the output.
+
+    For example, here we want to get all lines matching "foo" but not "bar":
+
+        cat table | tablizer foo '/bar/!'
+
+    This would match a line "foo zorro" but not "foo bar".
+
+    The flags can also be combined.
+
+    You can also 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.
 
@@ -185,6 +209,44 @@ DESCRIPTION
 
     where "C" is our regexp which matches CMD.
 
+    If a column specifier doesn't look like a regular expression, matching
+    against header fields will be case insensitive. So, if you have a field
+    with the name "ID" then these will all match: "-c id", "-c Id". The same
+    rule applies to the options "-T" and "-F".
+
+  TRANSPOSE FIELDS USING REGEXPS
+    You can manipulate field contents using regular expressions. You have to
+    tell tablizer which field[s] to operate on using the option "-T" and the
+    search/replace pattern using "-R". The number of columns and patterns
+    must match.
+
+    A search/replace pattern consists of the following elements:
+
+        /search-regexp/replace-string/
+
+    The separator can be any valid character. Especially if you want to use
+    a regexp containing the "/" character, eg:
+
+        |search-regexp|replace-string|
+
+    Example:
+
+        cat t/testtable2
+        NAME  DURATION
+        x     10
+        a     100
+        z     0
+        u     4
+        k     6
+    
+        cat t/testtable2 | tablizer -T2 -R '/^\d/4/' -n
+        NAME    DURATION 
+        x       40      
+        a       400     
+        z       4       
+        u       4       
+        k       4
+
   OUTPUT MODES
     There might be cases when the tabular output of a program is way too
     large for your current terminal but you still need to see every column.
@@ -343,42 +405,44 @@ AUTHORS
 var usage = `
 
 Usage:
-  tablizer [regex] [file, ...] [flags]
+  tablizer [regex,...] [file, ...] [flags]
 
 Operational Flags:
-  -c, --columns string     Only show the speficied columns (separated by ,)
+  -c, --columns string              Only show the speficied columns (separated by ,)
-  -v, --invert-match       select non-matching rows
+  -v, --invert-match                select non-matching rows
-  -n, --no-numbering       Disable header numbering
+  -n, --no-numbering                Disable header numbering
-  -N, --no-color           Disable pattern highlighting
+  -N, --no-color                    Disable pattern highlighting
-  -H, --no-headers         Disable headers display
+  -H, --no-headers                  Disable headers display
-  -s, --separator string   Custom field separator
+  -s, --separator string            Custom field separator
-  -k, --sort-by int        Sort by column (default: 1)
+  -k, --sort-by int|name            Sort by column (default: 1)
-  -z, --fuzzy              Use fuzzy search [experimental]
+  -z, --fuzzy                       Use fuzzy search [experimental]
-  -F, --filter field=reg   Filter given field with regex, can be used multiple times
+  -F, --filter field=reg            Filter given field with regex, can be used multiple times
+  -T, --transpose-columns string    Transpose the speficied columns (separated by ,)
+  -R, --regex-transposer /from/to/  Apply /search/replace/ regexp to fields given in -T
 
 Output Flags (mutually exclusive):
-  -X, --extended           Enable extended output
+  -X, --extended                    Enable extended output
-  -M, --markdown           Enable markdown table output
+  -M, --markdown                    Enable markdown table output
-  -O, --orgtbl             Enable org-mode table output
+  -O, --orgtbl                      Enable org-mode table output
-  -S, --shell              Enable shell evaluable output
+  -S, --shell                       Enable shell evaluable output
-  -Y, --yaml               Enable yaml output
+  -Y, --yaml                        Enable yaml output
-  -C, --csv                Enable CSV output
+  -C, --csv                         Enable CSV output
-  -A, --ascii              Default output mode, ascii tabular
+  -A, --ascii                       Default output mode, ascii tabular
-  -L, --hightlight-lines   Use alternating background colors for tables
+  -L, --hightlight-lines            Use alternating background colors for tables
 
 Sort Mode Flags (mutually exclusive):
-  -a, --sort-age           sort according to age (duration) string
+  -a, --sort-age                    sort according to age (duration) string
-  -D, --sort-desc          Sort in descending order (default: ascending)
+  -D, --sort-desc                   Sort in descending order (default: ascending)
-  -i, --sort-numeric       sort according to string numerical value
+  -i, --sort-numeric                sort according to string numerical value
-  -t, --sort-time          sort according to time string
+  -t, --sort-time                   sort according to time string
 
 Other Flags:
-      --completion <shell> Generate the autocompletion script for <shell>
+      --completion <shell>         Generate the autocompletion script for <shell>
-  -f, --config <file>      Configuration file (default: ~/.config/tablizer/config)
+  -f, --config <file>              Configuration file (default: ~/.config/tablizer/config)
-  -d, --debug              Enable debugging
+  -d, --debug                      Enable debugging
-  -h, --help               help for tablizer
+  -h, --help                       help for tablizer
-  -m, --man                Display manual page
+  -m, --man                        Display manual page
-  -V, --version            Print program version
+  -V, --version                    Print program version
 
 
 `

go.mod

@@ -5,11 +5,11 @@ go 1.22
 require (
 	github.com/alecthomas/repr v0.4.0
 	github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de
-	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/hashicorp/hcl/v2 v2.23.0
 	github.com/lithammer/fuzzysearch v1.1.8
 	github.com/olekukonko/tablewriter v0.0.5
+	github.com/rogpeppe/go-internal v1.13.1
 	github.com/spf13/cobra v1.8.1
 	gopkg.in/yaml.v3 v3.0.1
 )
@@ -18,27 +18,17 @@ require (
 	github.com/agext/levenshtein v1.2.3 // 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 v0.0.16 // indirect
 	github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7 // indirect
-	github.com/philhofer/fwd v1.1.2 // indirect
 	github.com/rivo/uniseg v0.2.0 // indirect
-	github.com/shurcooL/go v0.0.0-20230706063926-5fe729b41b3a // 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 v1.2.12 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
 	github.com/zclconf/go-cty v1.13.3 // indirect
-	golang.org/x/mod v0.13.0 // indirect
+	golang.org/x/mod v0.18.0 // indirect
-	golang.org/x/sys v0.13.0 // indirect
+	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/sys v0.21.0 // indirect
 	golang.org/x/text v0.11.0 // indirect
-	golang.org/x/tools v0.14.0 // indirect
+	golang.org/x/tools v0.22.0 // indirect
 )

go.sum

@@ -1,5 +1,3 @@
-github.com/agext/levenshtein v1.2.1 h1:QmvMAjj2aEICytGiWzmxoE0x2KZvE0fvmqMOfy2tjT8=
-github.com/agext/levenshtein v1.2.1/go.mod h1:JEDfjyjHDjOF/1e4FlBE/PkbqA9OfWu2ki2W0IB5558=
 github.com/agext/levenshtein v1.2.3 h1:YB2fHEn0UJagG8T1rrWknE3ZQzWM06O8AMAatNn7lmo=
 github.com/agext/levenshtein v1.2.3/go.mod h1:JEDfjyjHDjOF/1e4FlBE/PkbqA9OfWu2ki2W0IB5558=
 github.com/alecthomas/repr v0.4.0 h1:GhI2A8MACjfegCPVq9f1FLvIBS+DrQ2KQBFZP1iFzXc=
@@ -13,33 +11,20 @@ github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de/go.mod h1:DCaWoU
 github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/glycerine/blake2b v0.0.0-20151022103502-3c8c640cd7be h1:XBJdPGgA3qqhW+p9CANCAVdF7ZIXdu3pZAkypMkKAjE=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/glycerine/blake2b v0.0.0-20151022103502-3c8c640cd7be/go.mod h1:OSCrScrFAjcBObrulk6BEQlytA462OkG1UGB5NYj9kE=
-github.com/glycerine/goconvey v0.0.0-20190410193231-58a59202ab31 h1:gclg6gY70GLy3PbkQ1AERPfmLMMagS60DKF78eWwLn8=
-github.com/glycerine/goconvey v0.0.0-20190410193231-58a59202ab31/go.mod h1:Ogl1Tioa0aV7gstGFO7KhffUsb9M4ydbEbbxpcEDc24=
-github.com/glycerine/greenpack v5.1.1+incompatible h1:fDr9i6MkSGZmAy4VXPfJhW+SyK2/LNnzIp5nHyDiaIM=
-github.com/glycerine/greenpack v5.1.1+incompatible/go.mod h1:us0jVISAESGjsEuLlAfCd5nkZm6W6WQF18HPuOecIg4=
-github.com/glycerine/liner v0.0.0-20160121172638-72909af234e0 h1:4ZegphJXBTc4uFQ08UVoWYmQXorGa+ipXetUj83sMBc=
-github.com/glycerine/liner v0.0.0-20160121172638-72909af234e0/go.mod h1:AqJLs6UeoC65dnHxyCQ6MO31P5STpjcmgaANAU+No8Q=
-github.com/glycerine/zygomys v5.1.2+incompatible h1:jmcdmA3XPxgfOunAXFpipE9LQoUL6eX6d2mhYyjV4GE=
-github.com/glycerine/zygomys v5.1.2+incompatible/go.mod h1:i3SPKZpmy9dwF/3iWrXJ/ZLyzZucegwypwOmqRkUUaQ=
 github.com/go-test/deep v1.0.3 h1:ZrJSEWsXzPOxaZnFteGEfooLba+ju3FYIbOrS+rQd68=
+github.com/go-test/deep v1.0.3/go.mod h1:wGDj63lr65AM2AQyKZd/NYHGb0R+1RLqB8NKt3aSFNA=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/gookit/color v1.5.4 h1:FZmqs7XOyGgCAxmWyPslpiok1k05wmY3SJTytgvYFs0=
 github.com/gookit/color v1.5.4/go.mod h1:pZJOeOS8DM43rXbp4AZo1n9zCU2qjpcRko0b6/QJi9w=
-github.com/gopherjs/gopherjs v1.17.2 h1:fQnZVsXk8uxXIStYb0N4bGk7jeyTalG/wsZjQ25dO0g=
+github.com/hashicorp/hcl/v2 v2.23.0 h1:Fphj1/gCylPxHutVSEOf2fBOh1VE4AuLV7+kbJf3qos=
-github.com/gopherjs/gopherjs v1.17.2/go.mod h1:pRRIvn/QzFLrKfvEz3qUuEhtE/zLCWfreZ6J5gM2i+k=
+github.com/hashicorp/hcl/v2 v2.23.0/go.mod h1:62ZYHrXgPoX8xBnzl8QzbWq4dyDsDtfCRgIq1rbJEvA=
-github.com/hashicorp/hcl/v2 v2.22.0 h1:hkZ3nCtqeJsDhPRFz5EA9iwcG1hNWGePOTw6oyul12M=
-github.com/hashicorp/hcl/v2 v2.22.0/go.mod h1:62ZYHrXgPoX8xBnzl8QzbWq4dyDsDtfCRgIq1rbJEvA=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
-github.com/jtolds/gls v4.20.0+incompatible h1:xdiiI2gbIgH/gLH7ADydsJ1uDOEzR8yvV7C0MuV77Wo=
-github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
 github.com/lithammer/fuzzysearch v1.1.8 h1:/HIuJnjHuXS8bKaiTMeeDlW2/AyIWk2brx1V8LFgLN4=
 github.com/lithammer/fuzzysearch v1.1.8/go.mod h1:IdqeyBClc3FFqSzYq/MXESsS4S0FsZ5ajtkr5xPLts4=
 github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
-github.com/mattn/go-runewidth v0.0.10 h1:CoZ3S2P7pvtP45xOtBw+/mDL2z0RKI576gSkzRRpdGg=
 github.com/mattn/go-runewidth v0.0.10/go.mod h1:RAqKPSqVFrSLVXbA8x7dzmKdmGzieGRCM46jaSJTDAk=
 github.com/mattn/go-runewidth v0.0.16 h1:E5ScNMtiwvlvB5paMFdw9p4kSQzbXFikJ5SQO6TULQc=
 github.com/mattn/go-runewidth v0.0.16/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
@@ -47,22 +32,15 @@ github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7 h1:DpOJ2HYzC
 github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7/go.mod h1:ZXFpozHsX6DPmq2I0TCekCxypsnAUbP2oI0UX1GXzOo=
 github.com/olekukonko/tablewriter v0.0.5 h1:P2Ga83D34wi1o9J6Wh1mRuqd4mF/x/lgBS7N7AbDhec=
 github.com/olekukonko/tablewriter v0.0.5/go.mod h1:hPp6KlRPjbx+hW8ykQs1w3UBbZlj6HuIJcUGPhkA7kY=
-github.com/philhofer/fwd v1.1.2 h1:bnDivRJ1EWPjUIRXV5KfORO897HTbpFAQddBdE8t7Gw=
-github.com/philhofer/fwd v1.1.2/go.mod h1:qkPdfjR2SIEbspLqpe1tO4n5yICnr2DY7mqEx2tUTP0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/rivo/uniseg v0.1.0 h1:+2KBaVoUmb9XzDsrx/Ct0W/EYOSFf/nWTauy++DprtY=
 github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+github.com/rogpeppe/go-internal v1.13.1 h1:KvO1DLK/DRN07sQ1LQKScxyZJuNnedQ5/wKSR38lUII=
+github.com/rogpeppe/go-internal v1.13.1/go.mod h1:uMEvuHeurkdAXX61udpOXGD/AzZDWNMNyH2VO9fmH0o=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/scylladb/termtables v0.0.0-20191203121021-c4c0b6d42ff4/go.mod h1:C1a7PQSMz9NShzorzCiG2fk9+xuCgLkPeCvMHYR2OWg=
-github.com/shurcooL/go v0.0.0-20200502201357-93f07166e636 h1:aSISeOcal5irEhJd1M+IrApc0PdcN7e7Aj4yuEnOrfQ=
-github.com/shurcooL/go v0.0.0-20200502201357-93f07166e636/go.mod h1:TDJrrUr11Vxrven61rcy3hJMUqaf/CLWYhHNPmT14Lk=
-github.com/shurcooL/go v0.0.0-20230706063926-5fe729b41b3a h1:ZHfoO7ZJhws9NU1kzZhStUnnVQiPtDe1PzpUnc6HirU=
-github.com/shurcooL/go v0.0.0-20230706063926-5fe729b41b3a/go.mod h1:DNrlr0AR9NsHD/aoc2pPeu4uSBZ/71yCHkR42yrzW3M=
-github.com/shurcooL/go-goon v1.0.0 h1:BCQPvxGkHHJ4WpBO4m/9FXbITVIsvAm/T66cCcCGI7E=
-github.com/shurcooL/go-goon v1.0.0/go.mod h1:2wTHMsGo7qnpmqA8ADYZtP4I1DD94JpXGQ3Dxq2YQ5w=
 github.com/spf13/cobra v1.8.1 h1:e5/vxKd/rZsfSJMUX1agtjeTDf+qv1/JdBF8gg5k9ZM=
 github.com/spf13/cobra v1.8.1/go.mod h1:wHxEcudfqmLYa8iTfL+OuZPbBZkmvliBWKIezN3kD9Y=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
@@ -70,28 +48,22 @@ github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
-github.com/tinylib/msgp v1.1.9 h1:SHf3yoO2sGA0veCJeCBYLHuttAVFHGm2RHgNodW7wQU=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
-github.com/tinylib/msgp v1.1.9/go.mod h1:BCXGB54lDD8qUEPmiG0cQQUANC4IUQyB2ItS2UDlO/k=
-github.com/ugorji/go/codec v1.2.11 h1:BMaWp1Bb6fHwEtbplGBGJ498wD+LKlNSl25MjdZY4dU=
-github.com/ugorji/go/codec v1.2.11/go.mod h1:UNopzCgEMSXjBc6AOMqYvWC1ktqTAfzJZUZgYf6w6lg=
-github.com/ugorji/go/codec v1.2.12 h1:9LC83zGrHhuUA9l16C9AHXAqEV/2wBQ4nkvumAE65EE=
-github.com/ugorji/go/codec v1.2.12/go.mod h1:UNopzCgEMSXjBc6AOMqYvWC1ktqTAfzJZUZgYf6w6lg=
-github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778 h1:QldyIu/L63oPpyvQmHgvgickp1Yw510KJOqX7H24mg8=
-github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778/go.mod h1:2MuV+tbUrU1zIOPMxZ5EncGwgmMJsa+9ucAQZXxsObs=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e h1:JVG44RsyaB9T2KIHavMF/ppJZNG9ZpyihvCd0w101no=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e/go.mod h1:RbqR21r5mrJuqunuUZ/Dhy/avygyECGrLceyNeo4LiM=
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
-github.com/zclconf/go-cty v1.13.0 h1:It5dfKTTZHe9aeppbNOda3mN7Ag7sg6QkBNm6TkyFa0=
-github.com/zclconf/go-cty v1.13.0/go.mod h1:YKQzy/7pZ7iq2jNFzy5go57xdxdWoLLpaEp4u238AE0=
 github.com/zclconf/go-cty v1.13.3 h1:m+b9q3YDbg6Bec5rr+KGy1MzEVzY/jC2X+YX4yqKtHI=
 github.com/zclconf/go-cty v1.13.3/go.mod h1:YKQzy/7pZ7iq2jNFzy5go57xdxdWoLLpaEp4u238AE0=
 github.com/zclconf/go-cty-debug v0.0.0-20240509010212-0d6042c53940 h1:4r45xpDWB6ZMSMNJFMOjqrGHynW3DIBuR2H9j0ug+Mo=
+github.com/zclconf/go-cty-debug v0.0.0-20240509010212-0d6042c53940/go.mod h1:CmBdvvj3nqzfzJ6nTCIwDTPZ56aVGvDrmztiO5g3qrM=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/exp v0.0.0-20220909182711-5c715a9e8561 h1:MDc5xs78ZrZr3HMQugiXOAkSZtfTpbJLDr/lwfgO53E=
+golang.org/x/exp v0.0.0-20220909182711-5c715a9e8561/go.mod h1:cyybsKvd6eL0RnXn6p/Grxp8F5bW7iYuBgsNCOHpMYE=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
-golang.org/x/mod v0.13.0 h1:I/DsJXRlw/8l/0c24sM9yb0T4z9liZTduXvdAWYiysY=
+golang.org/x/mod v0.18.0 h1:5+9lSbEzPSdWkH32vYPBwEpX8KwDbM52Ud9xBUvNlb0=
-golang.org/x/mod v0.13.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/mod v0.18.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
@@ -99,15 +71,16 @@ golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.4.0 h1:zxkM55ReGkDlKSM+Fu41A+zmbZuaPVbGMzvvdUPznYQ=
+golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
+golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
+golang.org/x/sys v0.21.0 h1:rF+pYz3DAGSQAxAu1CbC7catZg4ebC4UIeIhKxBZvws=
-golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
@@ -122,8 +95,8 @@ golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGm
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
-golang.org/x/tools v0.14.0 h1:jvNa2pY0M4r62jkRQ6RwEZZyPcymeL9XZMLBbV7U2nc=
+golang.org/x/tools v0.22.0 h1:gqSGLZqv+AI9lIQzniJ0nZDRG5GBPsSi+DRNHWNz6yA=
-golang.org/x/tools v0.14.0/go.mod h1:uYBEerGOWcJyEORxN+Ek8+TT266gXkNlHdJBwexUsBg=
+golang.org/x/tools v0.22.0/go.mod h1:aCwcsjqvq7Yqt6TNyX7QMU2enbQ/Gt0bo6krSeEri+c=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

lib/filter.go

@@ -19,7 +19,6 @@ package lib
 
 import (
 	"bufio"
-	"fmt"
 	"io"
 	"strings"
 
@@ -28,15 +27,46 @@ import (
 )
 
 /*
- * [!]Match a  line, use fuzzy  search for normal pattern  strings and
+* [!]Match a  line, use fuzzy  search for normal pattern  strings and
- * regexp otherwise.
+* regexp otherwise.
- */
+
+		'foo bar'  foo, /bar/!  => false => line contains foo and not (not bar)
+	    'foo nix'  foo, /bar/!  => ture  => line contains foo and (not bar)
+		'foo bar'  foo, /bar/   => true  => line contains both foo and bar
+		'foo nix'  foo, /bar/   => false => line does not contain bar
+		'foo bar'  foo, /nix/   => false => line does not contain nix
+*/
 func matchPattern(conf cfg.Config, line string) bool {
-	if conf.UseFuzzySearch {
+	if len(conf.Patterns) == 0 {
-		return fuzzy.MatchFold(conf.Pattern, line)
+		// any line always matches ""
+		return true
 	}
 
-	return conf.PatternR.MatchString(line)
+	if conf.UseFuzzySearch {
+		// fuzzy search only considers the 1st pattern
+		return fuzzy.MatchFold(conf.Patterns[0].Pattern, line)
+	}
+
+	var match int
+
+	//fmt.Printf("<%s>\n", line)
+	for _, re := range conf.Patterns {
+		patmatch := re.PatternRe.MatchString(line)
+		if re.Negate {
+			// toggle the meaning of match
+			patmatch = !patmatch
+		}
+
+		if patmatch {
+			match++
+		}
+
+		//fmt.Printf("patmatch: %t, match: %d, pattern: %s, negate: %t\n", patmatch, match, re.Pattern, re.Negate)
+	}
+
+	// fmt.Printf("result: %t\n", match == len(conf.Patterns))
+	//fmt.Println()
+	return match == len(conf.Patterns)
 }
 
 /*
@@ -44,10 +74,10 @@ func matchPattern(conf cfg.Config, line string) bool {
  * 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) {
+func FilterByFields(conf cfg.Config, data *Tabdata) (*Tabdata, bool, error) {
 	if len(conf.Filters) == 0 {
 		// no filters, no checking
-		return Tabdata{}, false, nil
+		return nil, false, nil
 	}
 
 	newdata := data.CloneEmpty()
@@ -75,7 +105,44 @@ func FilterByFields(conf cfg.Config, data Tabdata) (Tabdata, bool, error) {
 		}
 	}
 
-	return newdata, true, nil
+	return &newdata, true, nil
+}
+
+/*
+ * Transpose fields using search/replace regexp.
+ */
+func TransposeFields(conf cfg.Config, data *Tabdata) (*Tabdata, bool, error) {
+	if len(conf.UseTransposers) == 0 {
+		// nothing to be done
+		return nil, false, nil
+	}
+
+	newdata := data.CloneEmpty()
+	transposed := false
+
+	for _, row := range data.entries {
+		transposedrow := false
+
+		for idx := range data.headers {
+			transposeidx, hasone := findindex(conf.UseTransposeColumns, idx+1)
+			if hasone {
+				row[idx] =
+					conf.UseTransposers[transposeidx].Search.ReplaceAllString(
+						row[idx],
+						conf.UseTransposers[transposeidx].Replace,
+					)
+				transposedrow = true
+			}
+		}
+
+		if transposedrow {
+			// also apply -v
+			newdata.entries = append(newdata.entries, row)
+			transposed = true
+		}
+	}
+
+	return &newdata, transposed, nil
 }
 
 /* generic map.Exists(key) */
@@ -87,8 +154,11 @@ func Exists[K comparable, V any](m map[K]V, v K) bool {
 	return false
 }
 
+/*
+ * Filters the whole input lines, returns filtered lines
+ */
 func FilterByPattern(conf cfg.Config, input io.Reader) (io.Reader, error) {
-	if conf.Pattern == "" {
+	if len(conf.Patterns) == 0 {
 		return input, nil
 	}
 
@@ -100,25 +170,13 @@ func FilterByPattern(conf cfg.Config, input io.Reader) (io.Reader, error) {
 		line := strings.TrimSpace(scanner.Text())
 		if hadFirst {
 			// don't match 1st line, it's the header
-			if conf.Pattern != "" && matchPattern(conf, line) == conf.InvertMatch {
+			if 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)

lib/filter_test.go

@@ -27,21 +27,21 @@ import (
 
 func TestMatchPattern(t *testing.T) {
 	var input = []struct {
-		name    string
+		name     string
-		fuzzy   bool
+		fuzzy    bool
-		pattern string
+		patterns []*cfg.Pattern
-		line    string
+		line     string
 	}{
 		{
-			name:    "normal",
+			name:     "normal",
-			pattern: "haus",
+			patterns: []*cfg.Pattern{{Pattern: "haus"}},
-			line:    "hausparty",
+			line:     "hausparty",
 		},
 		{
-			name:    "fuzzy",
+			name:     "fuzzy",
-			pattern: "hpt",
+			patterns: []*cfg.Pattern{{Pattern: "hpt"}},
-			line:    "haus-party-termin",
+			line:     "haus-party-termin",
-			fuzzy:   true,
+			fuzzy:    true,
 		},
 	}
 
@@ -55,7 +55,7 @@ func TestMatchPattern(t *testing.T) {
 				conf.UseFuzzySearch = true
 			}
 
-			err := conf.PreparePattern(inputdata.pattern)
+			err := conf.PreparePattern(inputdata.patterns)
 			if err != nil {
 				t.Errorf("PreparePattern returned error: %s", err)
 			}
@@ -153,8 +153,8 @@ func TestFilterByFields(t *testing.T) {
 				t.Errorf("PrepareFilters returned error: %s", err)
 			}
 
-			data, _, _ := FilterByFields(conf, data)
+			data, _, _ := FilterByFields(conf, &data)
-			if !reflect.DeepEqual(data, inputdata.expect) {
+			if !reflect.DeepEqual(*data, inputdata.expect) {
 				t.Errorf("Filtered data does not match expected data:\ngot: %+v\nexp: %+v", data, inputdata.expect)
 			}
 		})

lib/helpers.go

@@ -40,6 +40,16 @@ func contains(s []int, e int) bool {
 	return false
 }
 
+func findindex(s []int, e int) (int, bool) {
+	for i, a := range s {
+		if a == e {
+			return i, true
+		}
+	}
+
+	return 0, false
+}
+
 // validate the consitency of parsed data
 func ValidateConsistency(data *Tabdata) error {
 	expectedfields := len(data.headers)
@@ -55,31 +65,94 @@ func ValidateConsistency(data *Tabdata) error {
 }
 
 // parse columns list given  with -c, modifies config.UseColumns based
-// on eventually given regex
+// on eventually given regex.
+// This is an output filter, because -cN,N,... is being applied AFTER
+// processing of the input data.
 func PrepareColumns(conf *cfg.Config, data *Tabdata) error {
-	if conf.Columns == "" {
+	// -c columns
-		return nil
+	usecolumns, err := PrepareColumnVars(conf.Columns, data)
+	if err != nil {
+		return err
 	}
 
-	for _, use := range strings.Split(conf.Columns, ",") {
+	conf.UseColumns = usecolumns
-		if len(use) == 0 {
+
-			return fmt.Errorf("could not parse columns list %s: empty column", conf.Columns)
+	return nil
+}
+
+// Same thing as above but for -T option, which is an input option,
+// because transposers are being applied before output.
+func PrepareTransposerColumns(conf *cfg.Config, data *Tabdata) error {
+	// -T columns
+	usetransposecolumns, err := PrepareColumnVars(conf.TransposeColumns, data)
+	if err != nil {
+		return err
+	}
+
+	conf.UseTransposeColumns = usetransposecolumns
+
+	// verify that columns and transposers match and prepare transposer structs
+	if err := conf.PrepareTransposers(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// output option, prepare -k1,2 sort fields
+func PrepareSortColumns(conf *cfg.Config, data *Tabdata) error {
+	// -c columns
+	usecolumns, err := PrepareColumnVars(conf.SortByColumn, data)
+	if err != nil {
+		return err
+	}
+
+	conf.UseSortByColumn = usecolumns
+
+	return nil
+}
+
+func PrepareColumnVars(columns string, data *Tabdata) ([]int, error) {
+	if columns == "" {
+		return nil, nil
+	}
+
+	usecolumns := []int{}
+
+	isregex := regexp.MustCompile(`\W`)
+
+	for _, columnpattern := range strings.Split(columns, ",") {
+		if len(columnpattern) == 0 {
+			return nil, fmt.Errorf("could not parse columns list %s: empty column", columns)
 		}
 
-		usenum, err := strconv.Atoi(use)
+		usenum, err := strconv.Atoi(columnpattern)
 		if err != nil {
-			// might be a regexp
+			// not a number
-			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)
+			if !isregex.MatchString(columnpattern) {
-			}
+				// is not a regexp (contains no non-word chars)
+				// lc() it so that word searches are case insensitive
+				columnpattern = strings.ToLower(columnpattern)
 
-			// find matching header fields
+				for i, head := range data.headers {
-			for i, head := range data.headers {
+					if columnpattern == strings.ToLower(head) {
-				if colPattern.MatchString(head) {
+						usecolumns = append(usecolumns, i+1)
-					conf.UseColumns = append(conf.UseColumns, i+1)
+					}
+				}
+			} else {
+				colPattern, err := regexp.Compile("(?i)" + columnpattern)
+				if err != nil {
+					msg := fmt.Sprintf("Could not parse columns list %s: %v", columns, err)
+
+					return nil, errors.New(msg)
+				}
+
+				// find matching header fields, ignoring case
+				for i, head := range data.headers {
+					if colPattern.MatchString(strings.ToLower(head)) {
+						usecolumns = append(usecolumns, i+1)
+					}
 				}
 			}
 		} else {
@@ -87,27 +160,28 @@ func PrepareColumns(conf *cfg.Config, data *Tabdata) error {
 			// 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)
+			usecolumns = append(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(conf.UseColumns))
+	imap := make(map[int]int, len(usecolumns))
-	for _, i := range conf.UseColumns {
+	for _, i := range usecolumns {
 		imap[i] = 0
 	}
 
-	conf.UseColumns = nil
+	// fill with deduplicated columns
+	usecolumns = nil
 
 	for k := range imap {
-		conf.UseColumns = append(conf.UseColumns, k)
+		usecolumns = append(usecolumns, k)
 	}
 
-	sort.Ints(conf.UseColumns)
+	sort.Ints(usecolumns)
 
-	return nil
+	return usecolumns, nil
 }
 
 // prepare headers: add numbers to headers
@@ -219,12 +293,20 @@ func colorizeData(conf cfg.Config, output string) string {
 
 		return colorized
 
-	case len(conf.Pattern) > 0 && !conf.NoColor && color.IsConsole(os.Stdout):
+	case len(conf.Patterns) > 0 && !conf.NoColor && color.IsConsole(os.Stdout):
-		r := regexp.MustCompile("(" + conf.Pattern + ")")
+		out := output
 
-		return r.ReplaceAllStringFunc(output, func(in string) string {
+		for _, re := range conf.Patterns {
-			return conf.ColorStyle.Sprint(in)
+			if !re.Negate {
-		})
+				r := regexp.MustCompile("(" + re.Pattern + ")")
+
+				out = r.ReplaceAllStringFunc(out, func(in string) string {
+					return conf.ColorStyle.Sprint(in)
+				})
+			}
+		}
+
+		return out
 
 	default:
 		return output

lib/helpers_test.go

@@ -67,8 +67,8 @@ func TestPrepareColumns(t *testing.T) {
 	}{
 		{"1,2,3", []int{1, 2, 3}, false},
 		{"1,2,", []int{}, true},
-		{"T", []int{2, 3}, false},
+		{"T.", []int{2, 3}, false},
-		{"T,2,3", []int{2, 3}, false},
+		{"T.,2,3", []int{2, 3}, false},
 		{"[a-z,4,5", []int{4, 5}, true}, // invalid regexp
 	}
 
@@ -90,6 +90,86 @@ func TestPrepareColumns(t *testing.T) {
 	}
 }
 
+func TestPrepareTransposerColumns(t *testing.T) {
+	data := Tabdata{
+		maxwidthHeader: 5,
+		columns:        3,
+		headers: []string{
+			"ONE", "TWO", "THREE",
+		},
+		entries: [][]string{
+			{
+				"2", "3", "4",
+			},
+		},
+	}
+
+	var tests = []struct {
+		input     string
+		transp    []string
+		exp       int
+		wanterror bool // expect error
+	}{
+		{
+			"1",
+			[]string{`/\d/x/`},
+			1,
+			false,
+		},
+		{
+			"T.", // will match [T]WO and [T]HREE
+			[]string{`/\d/x/`, `/.//`},
+			2,
+			false,
+		},
+		{
+			"TH.,2",
+			[]string{`/\d/x/`, `/.//`},
+			2,
+			false,
+		},
+		{
+			"1",
+			[]string{},
+			1,
+			true,
+		},
+		{
+			"",
+			[]string{`|.|N|`},
+			0,
+			true,
+		},
+		{
+			"1",
+			[]string{`|.|N|`},
+			1,
+			false,
+		},
+	}
+
+	for _, testdata := range tests {
+		testname := fmt.Sprintf("PrepareTransposerColumns-%s-%t", testdata.input, testdata.wanterror)
+		t.Run(testname, func(t *testing.T) {
+			conf := cfg.Config{TransposeColumns: testdata.input, Transposers: testdata.transp}
+			err := PrepareTransposerColumns(&conf, &data)
+			if err != nil {
+				if !testdata.wanterror {
+					t.Errorf("got error: %v", err)
+				}
+			} else {
+				if len(conf.UseTransposeColumns) != testdata.exp {
+					t.Errorf("got %d, want %d", conf.UseTransposeColumns, testdata.exp)
+				}
+
+				if len(conf.Transposers) != len(conf.UseTransposeColumns) {
+					t.Errorf("got %d, want %d", conf.UseTransposeColumns, testdata.exp)
+				}
+			}
+		})
+	}
+}
+
 func TestReduceColumns(t *testing.T) {
 	var tests = []struct {
 		expect  [][]string

lib/io.go

@@ -29,90 +29,79 @@ import (
 const RWRR = 0755
 
 func ProcessFiles(conf *cfg.Config, args []string) error {
-	fds, pattern, err := determineIO(conf, args)
+	fd, patterns, err := determineIO(conf, args)
 
 	if err != nil {
 		return err
 	}
 
-	if err := conf.PreparePattern(pattern); err != nil {
+	if err := conf.PreparePattern(patterns); err != nil {
 		return err
 	}
 
-	for _, fd := range fds {
+	data, err := Parse(*conf, fd)
-		data, err := Parse(*conf, fd)
+	if err != nil {
-		if err != nil {
+		return err
-			return err
-		}
-
-		if err = ValidateConsistency(&data); err != nil {
-			return err
-		}
-
-		err = PrepareColumns(conf, &data)
-		if err != nil {
-			return err
-		}
-
-		printData(os.Stdout, *conf, &data)
 	}
 
+	if err = ValidateConsistency(&data); err != nil {
+		return err
+	}
+
+	err = PrepareSortColumns(conf, &data)
+	if err != nil {
+		return err
+	}
+
+	err = PrepareColumns(conf, &data)
+	if err != nil {
+		return err
+	}
+
+	printData(os.Stdout, *conf, &data)
+
 	return nil
 }
 
-func determineIO(conf *cfg.Config, args []string) ([]io.Reader, string, error) {
+func determineIO(conf *cfg.Config, args []string) (io.Reader, []*cfg.Pattern, error) {
-	var filehandles []io.Reader
+	var filehandle io.Reader
-
+	var patterns []*cfg.Pattern
-	var pattern string
-
 	var haveio bool
 
-	stat, _ := os.Stdin.Stat()
+	switch {
-	if (stat.Mode() & os.ModeCharDevice) == 0 {
+	case conf.InputFile == "-":
-		// we're reading from STDIN, which takes precedence over file args
+		filehandle = os.Stdin
-		filehandles = append(filehandles, os.Stdin)
+		haveio = true
+	case conf.InputFile != "":
+		fd, err := os.OpenFile(conf.InputFile, os.O_RDONLY, RWRR)
 
-		if len(args) > 0 {
+		if err != nil {
-			// ignore any args > 1
+			return nil, nil, fmt.Errorf("failed to read input file %s: %w", conf.InputFile, err)
-			pattern = args[0]
-			conf.Pattern = args[0] // used for colorization by printData()
 		}
 
+		filehandle = fd
 		haveio = true
-	} else if len(args) > 0 {
+	}
-		// threre were args left, take a look
+
-		if args[0] == "-" {
+	if !haveio {
-			// in traditional unix programs a dash denotes STDIN (forced)
+		stat, _ := os.Stdin.Stat()
-			filehandles = append(filehandles, os.Stdin)
+		if (stat.Mode() & os.ModeCharDevice) == 0 {
+			// we're reading from STDIN, which takes precedence over file args
+			filehandle = os.Stdin
 			haveio = true
-		} else {
+		}
-			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 {
+	if len(args) > 0 {
-				// consider any other args as files
+		patterns = make([]*cfg.Pattern, len(args))
-				for _, file := range args {
+		for i, arg := range args {
-					filehandle, err := os.OpenFile(file, os.O_RDONLY, RWRR)
+			patterns[i] = &cfg.Pattern{Pattern: arg}
-
-					if err != nil {
-						return nil, "", fmt.Errorf("failed to read input file %s: %w", file, err)
-					}
-
-					filehandles = append(filehandles, filehandle)
-					haveio = true
-				}
-			}
 		}
 	}
 
 	if !haveio {
-		return nil, "", errors.New("no file specified and nothing to read on stdin")
+		return nil, nil, errors.New("no file specified and nothing to read on stdin")
 	}
 
-	return filehandles, pattern, nil
+	return filehandle, patterns, nil
 }

lib/lisp.go

@@ -1,319 +0,0 @@
-/*
-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 err != nil {
-		if os.IsNotExist(err) {
-			// ignore non-existent files
-			return nil
-		}
-
-		return fmt.Errorf("failed to stat path: %w", err)
-	}
-
-	// 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
-}

lib/lisplib.go

@@ -1,88 +0,0 @@
-/*
-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)
-}

lib/parser.go

@@ -33,11 +33,31 @@ import (
 Parser switch
 */
 func Parse(conf cfg.Config, input io.Reader) (Tabdata, error) {
+	var data Tabdata
+	var err error
+
+	// first step, parse the data
 	if len(conf.Separator) == 1 {
-		return parseCSV(conf, input)
+		data, err = parseCSV(conf, input)
+	} else {
+		data, err = parseTabular(conf, input)
 	}
 
-	return parseTabular(conf, input)
+	if err != nil {
+		return data, err
+	}
+
+	// 2nd step, apply filters, code or transposers, if any
+	postdata, changed, err := PostProcess(conf, &data)
+	if err != nil {
+		return data, err
+	}
+
+	if changed {
+		return *postdata, nil
+	}
+
+	return data, err
 }
 
 /*
@@ -77,16 +97,6 @@ func parseCSV(conf 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
 }
 
@@ -110,9 +120,6 @@ func parseTabular(conf cfg.Config, input io.Reader) (Tabdata, error) {
 		if !hadFirst {
 			// header processing
 			data.columns = len(parts)
-			// if Debug {
-			// 	fmt.Println(parts)
-			// }
 
 			// process all header fields
 			for _, part := range parts {
@@ -130,7 +137,7 @@ func parseTabular(conf cfg.Config, input io.Reader) (Tabdata, error) {
 			}
 		} else {
 			// data processing
-			if conf.Pattern != "" && matchPattern(conf, line) == conf.InvertMatch {
+			if 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,
@@ -138,18 +145,6 @@ func parseTabular(conf cfg.Config, input io.Reader) (Tabdata, error) {
 				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
 			values := []string{}
 			for _, part := range parts {
@@ -174,29 +169,42 @@ func parseTabular(conf cfg.Config, input io.Reader) (Tabdata, error) {
 		return data, fmt.Errorf("failed to read from io.Reader: %w", scanner.Err())
 	}
 
+	return data, nil
+}
+
+func PostProcess(conf cfg.Config, data *Tabdata) (*Tabdata, bool, error) {
+	var modified bool
+
 	// 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)
+		return data, false, fmt.Errorf("failed to filter fields: %w", err)
 	}
 
 	if changed {
 		data = filtereddata
+		modified = true
 	}
 
-	// apply user defined lisp process hooks, if any
+	// check if transposers are valid and turn into Transposer structs
-	userdata, changed, err := RunProcessHooks(conf, data)
+	if err := PrepareTransposerColumns(&conf, data); err != nil {
+		return data, false, err
+	}
+
+	// transpose if demanded
+	modifieddata, changed, err := TransposeFields(conf, data)
 	if err != nil {
-		return data, fmt.Errorf("failed to apply filter hook: %w", err)
+		return data, false, fmt.Errorf("failed to transpose fields: %w", err)
 	}
 
 	if changed {
-		data = userdata
+		data = modifieddata
+		modified = true
 	}
 
 	if conf.Debug {
 		repr.Print(data)
 	}
 
-	return data, nil
+	return data, modified, nil
 }

lib/parser_test.go

@@ -83,36 +83,42 @@ func TestParser(t *testing.T) {
 
 func TestParserPatternmatching(t *testing.T) {
 	var tests = []struct {
-		entries [][]string
+		name     string
-		pattern string
+		entries  [][]string
-		invert  bool
+		patterns []*cfg.Pattern
-		want    bool
+		invert   bool
+		want     bool
 	}{
 		{
+			name: "match",
 			entries: [][]string{
 				{"asd", "igig", "cxxxncnc"},
 			},
-			pattern: "ig",
+			patterns: []*cfg.Pattern{{Pattern: "ig"}},
-			invert:  false,
+			invert:   false,
 		},
 		{
+			name: "invert",
 			entries: [][]string{
 				{"19191", "EDD 1", "X"},
 			},
-			pattern: "ig",
+			patterns: []*cfg.Pattern{{Pattern: "ig"}},
-			invert:  true,
+			invert:   true,
 		},
 	}
 
 	for _, inputdata := range input {
 		for _, testdata := range tests {
 			testname := fmt.Sprintf("parse-%s-with-pattern-%s-inverted-%t",
-				inputdata.name, testdata.pattern, testdata.invert)
+				inputdata.name, testdata.name, testdata.invert)
 			t.Run(testname, func(t *testing.T) {
-				conf := cfg.Config{InvertMatch: testdata.invert, Pattern: testdata.pattern,
+				conf := cfg.Config{
-					Separator: inputdata.separator}
+					InvertMatch: testdata.invert,
+					Patterns:    testdata.patterns,
+					Separator:   inputdata.separator,
+				}
 
-				_ = conf.PreparePattern(testdata.pattern)
+				_ = conf.PreparePattern(testdata.patterns)
 
 				readFd := strings.NewReader(strings.TrimSpace(inputdata.text))
 				gotdata, err := Parse(conf, readFd)
@@ -125,7 +131,7 @@ func TestParserPatternmatching(t *testing.T) {
 				} else {
 					if !reflect.DeepEqual(testdata.entries, gotdata.entries) {
 						t.Errorf("Parser returned invalid data (pattern: %s, invert: %t)\nExp: %+v\nGot: %+v\n",
-							testdata.pattern, testdata.invert, testdata.entries, gotdata.entries)
+							testdata.name, testdata.invert, testdata.entries, gotdata.entries)
 					}
 				}
 			})

lib/printer.go

@@ -33,15 +33,17 @@ import (
 )
 
 func printData(writer io.Writer, conf cfg.Config, data *Tabdata) {
-	// add numbers to headers and remove this we're not interested in
+	//  Sort   the  data  first,  before   headers+entries  are  being
+	// reduced. That way the user can specify any valid column to sort
+	// by, independently if it's being used for display or not.
+	sortTable(conf, data)
+
+	// add numbers to headers and remove those we're not interested in
 	numberizeAndReduceHeaders(conf, data)
 
 	// remove unwanted columns, if any
 	reduceColumns(conf, data)
 
-	// sort the data
-	sortTable(conf, data)
-
 	switch conf.OutputMode {
 	case cfg.Extended:
 		printExtendedData(writer, conf, data)

lib/printer_test.go

@@ -63,7 +63,7 @@ var tests = []struct {
 	name string // so we can identify which one fails, can be the same
 	// for multiple tests, because flags will be appended to the name
 	sortby    string // empty == default
-	column    int    // sort by this column, 0 == default first or NO Sort
+	column    int    // sort by this column (numbers start by 1)
 	desc      bool   // sort in descending order, default == ascending
 	nonum     bool   // hide numbering
 	mode      int    // shell, orgtbl, etc. empty == default: ascii
@@ -162,7 +162,7 @@ DURATION(2): 33d12h
 
 	//------------------------ SORT TESTS
 	{
-		name:   "sortbycolumn",
+		name:   "sortbycolumn3",
 		column: 3,
 		sortby: "numeric",
 		desc:   false,
@@ -173,7 +173,7 @@ beta   	1d10h5m1s  	33      	3/1/2014
 alpha  	4h35m      	170     	2013-Feb-03`,
 	},
 	{
-		name:   "sortbycolumn",
+		name:   "sortbycolumn4",
 		column: 4,
 		sortby: "time",
 		desc:   false,
@@ -184,7 +184,7 @@ alpha  	4h35m      	170     	2013-Feb-03
 beta   	1d10h5m1s  	33      	3/1/2014`,
 	},
 	{
-		name:   "sortbycolumn",
+		name:   "sortbycolumn2",
 		column: 2,
 		sortby: "duration",
 		desc:   false,
@@ -251,15 +251,14 @@ DURATION(2)	WHEN(4)
 
 func TestPrinter(t *testing.T) {
 	for _, testdata := range tests {
-		testname := fmt.Sprintf("print-sortcol-%d-desc-%t-sortby-%s-mode-%d-usecolumns-%s",
+		testname := fmt.Sprintf("print-%s-%d-desc-%t-sortby-%s-mode-%d-usecolumns-%s",
-			testdata.column, testdata.desc, testdata.sortby, testdata.mode, testdata.usecolstr)
+			testdata.name, 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 writer bytes.Buffer
 
 			// cmd flags
 			conf := cfg.Config{
-				SortByColumn:   testdata.column,
 				SortDescending: testdata.desc,
 				SortMode:       testdata.sortby,
 				OutputMode:     testdata.mode,
@@ -268,6 +267,10 @@ func TestPrinter(t *testing.T) {
 				NoColor:        true,
 			}
 
+			if testdata.column > 0 {
+				conf.UseSortByColumn = []int{testdata.column}
+			}
+
 			conf.ApplyDefaults()
 
 			// the test checks the len!

lib/sort.go

@@ -18,6 +18,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 package lib
 
 import (
+	"cmp"
 	"regexp"
 	"sort"
 	"strconv"
@@ -27,34 +28,41 @@ import (
 )
 
 func sortTable(conf cfg.Config, data *Tabdata) {
-	if conf.SortByColumn <= 0 {
+	if len(conf.UseSortByColumn) == 0 {
 		// no sorting wanted
 		return
 	}
 
-	// slightly modified here to match internal array indicies
-	col := conf.SortByColumn
-
-	col-- // ui starts counting by 1, but use 0 internally
-
 	// sanity checks
 	if len(data.entries) == 0 {
 		return
 	}
 
-	if col >= len(data.headers) {
-		// fall back to default column
-		col = 0
-	}
-
 	// actual sorting
 	sort.SliceStable(data.entries, func(i, j int) bool {
-		return compare(&conf, data.entries[i][col], data.entries[j][col])
+		// holds the result of a sort of one column
+		comparators := []int{}
+
+		// iterate over all columns to be sorted, conf.SortMode must be identical!
+		for _, column := range conf.UseSortByColumn {
+			comparators = append(comparators, compare(&conf, data.entries[i][column-1], data.entries[j][column-1]))
+		}
+
+		// return the combined result
+		res := cmp.Or(comparators...)
+
+		switch res {
+		case 0:
+			return true
+		default:
+			return false
+		}
+
 	})
 }
 
 // config is not modified here, but it would be inefficient to copy it every loop
-func compare(conf *cfg.Config, left string, right string) bool {
+func compare(conf *cfg.Config, left string, right string) int {
 	var comp bool
 
 	switch conf.SortMode {
@@ -88,7 +96,12 @@ func compare(conf *cfg.Config, left string, right string) bool {
 		comp = !comp
 	}
 
-	return comp
+	switch comp {
+	case true:
+		return 0
+	default:
+		return 1
+	}
 }
 
 /*

lib/sort_test.go

@@ -53,18 +53,18 @@ func TestCompare(t *testing.T) {
 		mode string
 		a    string
 		b    string
-		want bool
+		want int
 		desc bool
 	}{
 		// ascending
-		{"numeric", "10", "20", true, false},
+		{"numeric", "10", "20", 0, false},
-		{"duration", "2d4h5m", "45m", false, false},
+		{"duration", "2d4h5m", "45m", 1, false},
-		{"time", "12/24/2022", "1/1/1970", false, false},
+		{"time", "12/24/2022", "1/1/1970", 1, false},
 
 		// descending
-		{"numeric", "10", "20", false, true},
+		{"numeric", "10", "20", 1, true},
-		{"duration", "2d4h5m", "45m", true, true},
+		{"duration", "2d4h5m", "45m", 0, true},
-		{"time", "12/24/2022", "1/1/1970", true, true},
+		{"time", "12/24/2022", "1/1/1970", 0, true},
 	}
 
 	for _, testdata := range tests {
@@ -75,7 +75,7 @@ func TestCompare(t *testing.T) {
 			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)
+				t.Errorf("got %d, want %d", got, testdata.want)
 			}
 		})
 	}

main.go

@@ -18,9 +18,17 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 package main
 
 import (
+	"os"
+
 	"github.com/tlinden/tablizer/cmd"
 )
 
 func main() {
-	cmd.Execute()
+	os.Exit(Main())
+}
+
+func Main() int {
+	cmd.Execute()
+
+	return 0 // cmd takes care of exit 1 itself
 }

main_test.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"os"
+	"testing"
+
+	"github.com/rogpeppe/go-internal/testscript"
+)
+
+func TestMain(m *testing.M) {
+	os.Exit(testscript.RunMain(m, map[string]func() int{
+		"tablizer": Main,
+	}))
+}
+
+func TestTablizer(t *testing.T) {
+	testscript.Run(t, testscript.Params{
+		Dir: "t",
+	})
+}

t/test-basics.txtar

@@ -0,0 +1,43 @@
+# usage
+exec tablizer -h
+stdout Usage
+
+# version
+exec tablizer -V
+stdout version
+
+# manpage
+exec tablizer -m
+stdout SYNOPSIS
+
+# completion
+exec tablizer --completion bash
+stdout __tablizer_init_completion
+
+# use config (configures  colors, but these are not  being used, since
+# this  env doesn't  support it,  but at  least it  should succeed.
+exec tablizer -f config.hcl -r testtable.txt Runn
+stdout Runn
+
+
+
+# will be automatically created in work dir
+-- testtable.txt --
+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
+
+
+-- config.hcl --
+BG             = "lightGreen"
+FG             = "white"
+HighlightBG    = "lightGreen"
+HighlightFG    = "white"
+NoHighlightBG  = "white"
+NoHighlightFG  = "lightGreen"
+HighlightHdrBG = "red"
+HighlightHdrFG = "white"
+

t/test-csv.txtar

@@ -0,0 +1,26 @@
+# reading from file and matching with lowercase words
+exec tablizer -c name,status -r testtable.csv -s,
+stdout grafana.*Runn
+
+# matching mixed case
+exec tablizer -c NAME,staTUS -r testtable.csv -s,
+stdout grafana.*Runn
+
+# matching using numbers
+exec tablizer -c 1,3 -r testtable.csv -s,
+stdout grafana.*Runn
+
+# matching using regex
+exec tablizer -c 'na.*,stat.' -r testtable.csv -s,
+stdout grafana.*Runn
+
+
+# will be automatically created in work dir
+-- testtable.csv --
+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
+

t/test-filtering.txtar

@@ -0,0 +1,21 @@
+# filtering
+exec tablizer -r testtable.txt -F name=grafana
+stdout grafana.*Runn
+
+# filtering two columns
+exec tablizer -r testtable.txt -F name=prometh -F age=1h
+stdout blackbox.*Runn
+
+# filtering two same columns
+exec tablizer -r testtable.txt -F name=prometh -F name=alert
+stdout prometheus-alertmanager.*Runn
+
+
+# will be automatically created in work dir
+-- testtable.txt --
+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

t/test-headermatching.txtar

@@ -0,0 +1,25 @@
+# reading from file and matching with lowercase words
+exec tablizer -c name,status -r testtable.txt
+stdout grafana.*Runn
+
+# matching mixed case
+exec tablizer -c NAME,staTUS -r testtable.txt
+stdout grafana.*Runn
+
+# matching using numbers
+exec tablizer -c 1,3 -r testtable.txt
+stdout grafana.*Runn
+
+# matching using regex
+exec tablizer -c 'na.*,stat.' -r testtable.txt
+stdout grafana.*Runn
+
+
+# will be automatically created in work dir
+-- testtable.txt --
+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

t/test-multipatterns.txtar

@@ -0,0 +1,46 @@
+# filtering
+
+# a AND b
+exec tablizer -r testtable.txt -H -cspecies invasive imperium
+stdout 'namak'
+! stdout human
+
+# a AND !b
+exec tablizer -r testtable.txt -H -cspecies invasive '/imperium/!'
+stdout 'human'
+! stdout namak
+
+# a AND !b AND c
+exec tablizer -r testtable.txt -H -cspecies peaceful '/imperium/!' planetary
+stdout 'kenaha'
+! stdout 'namak|heduu|riedl'
+
+# case insensitive
+exec tablizer -r testtable.txt -H -cspecies '/REGIONAL/i'
+stdout namak
+! stdout 'human|riedl|heduu|kenaa'
+
+# case insensitive negated
+exec tablizer -r testtable.txt -H -cspecies '/REGIONAL/!i'
+stdout 'human|riedl|heduu|kenaa'
+! stdout namak
+
+# !a AND !b
+exec tablizer -r testtable.txt -H -cspecies '/galactic/!' '/planetary/!'
+stdout namak
+! stdout 'human|riedl|heduu|kenaa'
+
+# same case insensitive
+exec tablizer -r testtable.txt -H -cspecies '/GALACTIC/i!' '/PLANETARY/!i'
+stdout namak
+! stdout 'human|riedl|heduu|kenaa'
+
+# will be automatically created in work dir
+-- testtable.txt --
+SPECIES   TYPE         HOME     STAGE             SPREAD
+human     invasive     earth    brink             planetary
+riedl     peaceful     keauna   civilized         pangalactic
+namak     invasive     namak    imperium          regional
+heduu     peaceful     iu       imperium          galactic
+kenaha    peaceful     kohi     hunter-gatherer   planetary
+

t/test-sort.txtar

@@ -0,0 +1,49 @@
+# sort by name
+exec tablizer -r testtable.txt -k 1
+stdout '^alert.*\n^grafana.*\n^kube'
+
+# sort by name reversed
+exec tablizer -r testtable.txt -k 1 -D
+stdout 'kube.*\n^grafana.*\n^alert'
+
+# sort by starts numerically
+exec tablizer -r testtable.txt -k 4 -i -c4
+stdout '17\s*\n^20\s*\n^35'
+
+# sort by starts numerically reversed
+exec tablizer -r testtable.txt -k 4 -i -c4 -D
+stdout '35\s*\n^20\s*\n^17'
+
+# sort by age
+exec tablizer -r testtable.txt -k 5 -a
+stdout '45m\s*\n.*1h44m'
+
+# sort by age reverse
+exec tablizer -r testtable.txt -k 5 -a -D
+stdout '1h44m\s*\n.*45m'
+
+# sort by time
+exec tablizer -r timetable.txt -k 2 -t
+stdout '^sel.*\n^foo.*\nbar'
+
+# sort by time reverse
+exec tablizer -r timetable.txt -k 2 -t -D
+stdout '^bar.*\n^foo.*\nsel'
+
+
+# will be automatically created in work dir
+-- testtable.txt --
+NAME                                                 READY   STATUS    STARTS      AGE
+alertmanager-kube-prometheus-alertmanager-0          2/2     Running   35          11d
+kube-prometheus-blackbox-exporter-5d85b5d8f4-tskh7   1/1     Running   17          1h44m
+grafana-fcc54cbc9-bk7s8                              1/1     Running   17          1d
+kube-prometheus-kube-state-metrics-b4cd9487-75p7f    1/1     Running   20          45m
+kube-prometheus-node-exporter-bfzpl                  1/1     Running   17          54s
+
+
+
+-- timetable.txt --
+NAME  TIME
+foo   2024-11-18T12:00:00+01:00
+bar   2024-11-18T12:45:00+01:00
+sel   2024-07-18T12:00:00+01:00

t/test-stdin.txtar

@@ -0,0 +1,18 @@
+# reading from stdin and matching with lowercase words
+stdin testtable.txt
+exec tablizer -c name,status
+stdout grafana.*Runn
+
+# reading from -r stdin and matching with lowercase words
+stdin testtable.txt
+exec tablizer -c name,status -r -
+stdout grafana.*Runn
+
+# will be automatically created in work dir
+-- testtable.txt --
+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

t/test-transpose.txtar

@@ -0,0 +1,21 @@
+# transpose one field
+exec tablizer -r testtable.txt -T status -R '/Running/OK/'
+stdout grafana.*OK
+
+# transpose two fields
+exec tablizer -r testtable.txt -T name,status -R '/alertmanager-//' -R '/Running/OK/' 
+stdout prometheus-0.*OK
+
+# transpose one field and show one column
+exec tablizer -r testtable.txt -T status -R '/Running/OK/' -c name
+! stdout grafana.*OK
+
+
+# will be automatically created in work dir
+-- testtable.txt --
+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

t/test.sh

@@ -1,45 +0,0 @@
-#!/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

t/testtable.csv

@@ -0,0 +1,6 @@
+NAME,DURATION
+x,10
+a,100
+z,0
+u,4
+k,6

t/testtable3

@@ -0,0 +1,6 @@
+NAME                                                 READY   STATUS    STARTS      AGE
+alertmanager-kube-prometheus-alertmanager-0          2/2     Running   35          11d
+kube-prometheus-blackbox-exporter-5d85b5d8f4-tskh7   1/1     Running   17          1h44m
+grafana-fcc54cbc9-bk7s8                              1/1     Running   17          1d
+kube-prometheus-kube-state-metrics-b4cd9487-75p7f    1/1     Running   20          45m
+kube-prometheus-node-exporter-bfzpl                  1/1     Running   17          54s

t/testtable4

@@ -0,0 +1,4 @@
+ONE  TWO
+1    4
+3    1
+5    2

t/testtable5

@@ -0,0 +1,6 @@
+SPECIES   TYPE         HOME     STAGE
+human     invasive     earth    brink
+riedl     peaceful     keauna   civilized
+namak     invasive     namak    imperium
+heduu     peaceful     iu       imperium
+kenaha    peaceful     kohi     hunter-gatherer

tablizer.1

@@ -133,7 +133,7 @@
 .\" ========================================================================
 .\"
 .IX Title "TABLIZER 1"
-.TH TABLIZER 1 "2024-05-07" "1" "User Commands"
+.TH TABLIZER 1 "2025-01-22" "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
@@ -144,42 +144,44 @@ tablizer \- Manipulate tabular output of other programs
 .IX Header "SYNOPSIS"
 .Vb 2
 \&    Usage:
-\&      tablizer [regex] [file, ...] [flags]
+\&      tablizer [regex,...] [file, ...] [flags]
 \&    
 \&    Operational Flags:
-\&      \-c, \-\-columns string     Only show the speficied columns (separated by ,)
+\&      \-c, \-\-columns string              Only show the speficied columns (separated by ,)
-\&      \-v, \-\-invert\-match       select non\-matching rows
+\&      \-v, \-\-invert\-match                select non\-matching rows
-\&      \-n, \-\-no\-numbering       Disable header numbering
+\&      \-n, \-\-no\-numbering                Disable header numbering
-\&      \-N, \-\-no\-color           Disable pattern highlighting
+\&      \-N, \-\-no\-color                    Disable pattern highlighting
-\&      \-H, \-\-no\-headers         Disable headers display
+\&      \-H, \-\-no\-headers                  Disable headers display
-\&      \-s, \-\-separator string   Custom field separator
+\&      \-s, \-\-separator string            Custom field separator
-\&      \-k, \-\-sort\-by int        Sort by column (default: 1)
+\&      \-k, \-\-sort\-by int|name            Sort by column (default: 1)
-\&      \-z, \-\-fuzzy              Use fuzzy search [experimental]
+\&      \-z, \-\-fuzzy                       Use fuzzy search [experimental]
-\&      \-F, \-\-filter field=reg   Filter given field with regex, can be used multiple times
+\&      \-F, \-\-filter field=reg            Filter given field with regex, can be used multiple times
+\&      \-T, \-\-transpose\-columns string    Transpose the speficied columns (separated by ,)
+\&      \-R, \-\-regex\-transposer /from/to/  Apply /search/replace/ regexp to fields given in \-T
 \&
 \&    Output Flags (mutually exclusive):
-\&      \-X, \-\-extended           Enable extended output
+\&      \-X, \-\-extended                    Enable extended output
-\&      \-M, \-\-markdown           Enable markdown table output
+\&      \-M, \-\-markdown                    Enable markdown table output
-\&      \-O, \-\-orgtbl             Enable org\-mode table output
+\&      \-O, \-\-orgtbl                      Enable org\-mode table output
-\&      \-S, \-\-shell              Enable shell evaluable output
+\&      \-S, \-\-shell                       Enable shell evaluable output
-\&      \-Y, \-\-yaml               Enable yaml output
+\&      \-Y, \-\-yaml                        Enable yaml output
-\&      \-C, \-\-csv                Enable CSV output
+\&      \-C, \-\-csv                         Enable CSV output
-\&      \-A, \-\-ascii              Default output mode, ascii tabular
+\&      \-A, \-\-ascii                       Default output mode, ascii tabular
-\&      \-L, \-\-hightlight\-lines   Use alternating background colors for tables
+\&      \-L, \-\-hightlight\-lines            Use alternating background colors for tables
 \&
 \&    Sort Mode Flags (mutually exclusive):
-\&      \-a, \-\-sort\-age           sort according to age (duration) string
+\&      \-a, \-\-sort\-age                    sort according to age (duration) string
-\&      \-D, \-\-sort\-desc          Sort in descending order (default: ascending)
+\&      \-D, \-\-sort\-desc                   Sort in descending order (default: ascending)
-\&      \-i, \-\-sort\-numeric       sort according to string numerical value
+\&      \-i, \-\-sort\-numeric                sort according to string numerical value
-\&      \-t, \-\-sort\-time          sort according to time string
+\&      \-t, \-\-sort\-time                   sort according to time string
 \&
 \&    Other Flags:
-\&          \-\-completion <shell> Generate the autocompletion script for <shell>
+\&          \-\-completion <shell>         Generate the autocompletion script for <shell>
-\&      \-f, \-\-config <file>      Configuration file (default: ~/.config/tablizer/config)
+\&      \-f, \-\-config <file>              Configuration file (default: ~/.config/tablizer/config)
-\&      \-d, \-\-debug              Enable debugging
+\&      \-d, \-\-debug                      Enable debugging
-\&      \-h, \-\-help               help for tablizer
+\&      \-h, \-\-help                       help for tablizer
-\&      \-m, \-\-man                Display manual page
+\&      \-m, \-\-man                        Display manual page
-\&      \-V, \-\-version            Print program version
+\&      \-V, \-\-version                    Print program version
 .Ve
 .SH "DESCRIPTION"
 .IX Header "DESCRIPTION"
@@ -248,11 +250,20 @@ 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
 Use the  \fB\-k\fR option to specify  by which column to  sort the tabular
-data (as in \s-1GNU\s0 \fBsort\fR\|(1)). The default sort column is the first one. To
+data  (as in  \s-1GNU\s0  \fBsort\fR\|(1)).  The default  sort  column  is the  first
-disable sorting at all, supply 0  (Zero) to \-k. The default sort order
+one. You can specify column numbers or names. Column numbers start
-is ascending. You can change this to descending order using the option
+with 1, names are case insensitive. You can specify multiple columns
-\&\fB\-D\fR. The default  sort order is by string, but  there are other sort
+separated by comma to sort, but the type must be the same. For example
-modes:
+if you want to sort numerically, all columns must be numbers. If you
+use column numbers, then be aware, that these are the numbers before
+column extraction. For example if you have a table with 4 columns and
+specify \f(CW\*(C`\-c4\*(C'\fR, then only 1 column (the fourth) will be printed,
+however if you want to sort by this column, you'll have to specify
+\&\f(CW\*(C`\-k4\*(C'\fR.
+.PP
+The default  sort order  is ascending.  You can  change this  to
+descending order using the option \fB\-D\fR.  The default sort order is by
+alphanumeric string, but there are other sort modes:
 .IP "\fB\-a \-\-sort\-age\fR" 4
 .IX Item "-a --sort-age"
 Sorts duration strings like \*(L"1d4h32m51s\*(R".
@@ -267,38 +278,52 @@ Finally the  \fB\-d\fR option  enables debugging  output which  is mostly
 useful for the developer.
 .SS "\s-1PATTERNS AND FILTERING\s0"
 .IX Subsection "PATTERNS AND FILTERING"
-You can reduce the rows being  displayed by using a regular expression
+You can reduce  the rows being displayed by using  one or more regular
-pattern.  The  regexp is  \s-1PCRE\s0 compatible, refer  to the  syntax cheat
+expression patterns.   The regexp  language being used  is the  one of
-sheet here: <https://github.com/google/re2/wiki/Syntax>.  If you want
+\&\s-1GOLANG,\s0     refer    to     the    syntax     cheat    sheet     here:
-to read  a more comprehensive  documentation about the topic  and have
+<https://pkg.go.dev/regexp/syntax>.
-perl installed you can read it with:
+.PP
+If you  want to  read a more  comprehensive documentation  about the
+topic and have perl installed you can read it with:
 .PP
 .Vb 1
 \&    perldoc perlre
 .Ve
 .PP
-Or read it online: <https://perldoc.perl.org/perlre>.
+Or read it online: <https://perldoc.perl.org/perlre>. But please note
+that the \s-1GO\s0 regexp engine does \s-1NOT\s0 support all perl regex terms,
+especially look-ahead and look-behind.
 .PP
-A note on  modifiers: the regexp engine used in  tablizer uses another
+If you want to supply flags to a regex, then surround it with slashes
-modifier syntax:
+and append the flag. The following flags are supported:
 .PP
-.Vb 1
+.Vb 2
-\&    (?MODIFIER)
+\&    i => case insensitive
+\&    ! => negative match
 .Ve
 .PP
-The most important modifiers are:
-.PP
-\&\f(CW\*(C`i\*(C'\fR ignore case
-\&\f(CW\*(C`m\*(C'\fR multiline mode
-\&\f(CW\*(C`s\*(C'\fR single line mode
-.PP
 Example for a case insensitive search:
 .PP
 .Vb 1
-\&    kubectl get pods \-A | tablizer "(?i)account"
+\&    kubectl get pods \-A | tablizer "/account/i"
 .Ve
 .PP
-You  can use  the experimental  fuzzy search  feature by  providing the
+If you use the \f(CW\*(C`!\*(C'\fR flag, then the regex match will be negated, that
+is, if a line in the input matches the given regex, but \f(CW\*(C`!\*(C'\fR is
+supplied, tablizer will \s-1NOT\s0 include it in the output.
+.PP
+For example, here we want to get all lines matching \*(L"foo\*(R" but not
+\&\*(L"bar\*(R":
+.PP
+.Vb 1
+\&    cat table | tablizer foo \*(Aq/bar/!\*(Aq
+.Ve
+.PP
+This would match a line \*(L"foo zorro\*(R" but not \*(L"foo bar\*(R".
+.PP
+The flags can also be combined.
+.PP
+You  can also 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
@@ -348,6 +373,50 @@ We want to see only the \s-1CMD\s0 column and use a regex for this:
 .Ve
 .PP
 where \*(L"C\*(R" is our regexp which matches \s-1CMD.\s0
+.PP
+If a column specifier doesn't look like a regular expression, matching
+against header  fields will  be case  insensitive. So,  if you  have a
+field with  the name \f(CW\*(C`ID\*(C'\fR then  these will all match:  \f(CW\*(C`\-c id\*(C'\fR, \f(CW\*(C`\-c
+Id\*(C'\fR. The same rule applies to the options \f(CW\*(C`\-T\*(C'\fR and \f(CW\*(C`\-F\*(C'\fR.
+.SS "\s-1TRANSPOSE FIELDS USING REGEXPS\s0"
+.IX Subsection "TRANSPOSE FIELDS USING REGEXPS"
+You can manipulate field contents using regular expressions. You have
+to tell tablizer which field[s] to operate on using the option \f(CW\*(C`\-T\*(C'\fR
+and the search/replace pattern using \f(CW\*(C`\-R\*(C'\fR. The number of columns and
+patterns must match.
+.PP
+A search/replace pattern consists of the following elements:
+.PP
+.Vb 1
+\&    /search\-regexp/replace\-string/
+.Ve
+.PP
+The separator can be any valid character. Especially if you want to
+use a regexp containing the \f(CW\*(C`/\*(C'\fR character, eg:
+.PP
+.Vb 1
+\&    |search\-regexp|replace\-string|
+.Ve
+.PP
+Example:
+.PP
+.Vb 7
+\&    cat t/testtable2
+\&    NAME  DURATION
+\&    x     10
+\&    a     100
+\&    z     0
+\&    u     4
+\&    k     6
+\&    
+\&    cat t/testtable2 | tablizer \-T2 \-R \*(Aq/^\ed/4/\*(Aq \-n
+\&    NAME    DURATION 
+\&    x       40      
+\&    a       400     
+\&    z       4       
+\&    u       4       
+\&    k       4
+.Ve
 .SS "\s-1OUTPUT MODES\s0"
 .IX Subsection "OUTPUT MODES"
 There might be cases  when the tabular output of a  program is way too

tablizer.pod

@@ -5,42 +5,44 @@ tablizer - Manipulate tabular output of other programs
 =head1 SYNOPSIS
 
     Usage:
-      tablizer [regex] [file, ...] [flags]
+      tablizer [regex,...] [file, ...] [flags]
     
     Operational Flags:
-      -c, --columns string     Only show the speficied columns (separated by ,)
+      -c, --columns string              Only show the speficied columns (separated by ,)
-      -v, --invert-match       select non-matching rows
+      -v, --invert-match                select non-matching rows
-      -n, --no-numbering       Disable header numbering
+      -n, --no-numbering                Disable header numbering
-      -N, --no-color           Disable pattern highlighting
+      -N, --no-color                    Disable pattern highlighting
-      -H, --no-headers         Disable headers display
+      -H, --no-headers                  Disable headers display
-      -s, --separator string   Custom field separator
+      -s, --separator string            Custom field separator
-      -k, --sort-by int        Sort by column (default: 1)
+      -k, --sort-by int|name            Sort by column (default: 1)
-      -z, --fuzzy              Use fuzzy search [experimental]
+      -z, --fuzzy                       Use fuzzy search [experimental]
-      -F, --filter field=reg   Filter given field with regex, can be used multiple times
+      -F, --filter field=reg            Filter given field with regex, can be used multiple times
+      -T, --transpose-columns string    Transpose the speficied columns (separated by ,)
+      -R, --regex-transposer /from/to/  Apply /search/replace/ regexp to fields given in -T
 
     Output Flags (mutually exclusive):
-      -X, --extended           Enable extended output
+      -X, --extended                    Enable extended output
-      -M, --markdown           Enable markdown table output
+      -M, --markdown                    Enable markdown table output
-      -O, --orgtbl             Enable org-mode table output
+      -O, --orgtbl                      Enable org-mode table output
-      -S, --shell              Enable shell evaluable output
+      -S, --shell                       Enable shell evaluable output
-      -Y, --yaml               Enable yaml output
+      -Y, --yaml                        Enable yaml output
-      -C, --csv                Enable CSV output
+      -C, --csv                         Enable CSV output
-      -A, --ascii              Default output mode, ascii tabular
+      -A, --ascii                       Default output mode, ascii tabular
-      -L, --hightlight-lines   Use alternating background colors for tables
+      -L, --hightlight-lines            Use alternating background colors for tables
 
     Sort Mode Flags (mutually exclusive):
-      -a, --sort-age           sort according to age (duration) string
+      -a, --sort-age                    sort according to age (duration) string
-      -D, --sort-desc          Sort in descending order (default: ascending)
+      -D, --sort-desc                   Sort in descending order (default: ascending)
-      -i, --sort-numeric       sort according to string numerical value
+      -i, --sort-numeric                sort according to string numerical value
-      -t, --sort-time          sort according to time string
+      -t, --sort-time                   sort according to time string
 
     Other Flags:
-          --completion <shell> Generate the autocompletion script for <shell>
+          --completion <shell>         Generate the autocompletion script for <shell>
-      -f, --config <file>      Configuration file (default: ~/.config/tablizer/config)
+      -f, --config <file>              Configuration file (default: ~/.config/tablizer/config)
-      -d, --debug              Enable debugging
+      -d, --debug                      Enable debugging
-      -h, --help               help for tablizer
+      -h, --help                       help for tablizer
-      -m, --man                Display manual page
+      -m, --man                        Display manual page
-      -V, --version            Print program version
+      -V, --version                    Print program version
 
 
 =head1 DESCRIPTION
@@ -104,11 +106,20 @@ By  default, if  a  B<pattern>  has been  speficied,  matches will  be
 highlighted. You can disable this behavior with the B<-N> option.
 
 Use the  B<-k> option to specify  by which column to  sort the tabular
-data (as in GNU sort(1)). The default sort column is the first one. To
+data  (as in  GNU  sort(1)).  The default  sort  column  is the  first
-disable sorting at all, supply 0  (Zero) to -k. The default sort order
+one. You can specify column numbers or names. Column numbers start
-is ascending. You can change this to descending order using the option
+with 1, names are case insensitive. You can specify multiple columns
-B<-D>. The default  sort order is by string, but  there are other sort
+separated by comma to sort, but the type must be the same. For example
-modes:
+if you want to sort numerically, all columns must be numbers. If you
+use column numbers, then be aware, that these are the numbers before
+column extraction. For example if you have a table with 4 columns and
+specify C<-c4>, then only 1 column (the fourth) will be printed,
+however if you want to sort by this column, you'll have to specify
+C<-k4>.
+
+The default  sort order  is ascending.  You can  change this  to
+descending order using the option B<-D>.  The default sort order is by
+alphanumeric string, but there are other sort modes:
 
 =over
 
@@ -131,32 +142,44 @@ useful for the developer.
 
 =head2 PATTERNS AND FILTERING
 
-You can reduce the rows being  displayed by using a regular expression
+You can reduce  the rows being displayed by using  one or more regular
-pattern.  The  regexp is  PCRE compatible, refer  to the  syntax cheat
+expression patterns.   The regexp  language being used  is the  one of
-sheet here: L<https://github.com/google/re2/wiki/Syntax>.  If you want
+GOLANG,     refer    to     the    syntax     cheat    sheet     here:
-to read  a more comprehensive  documentation about the topic  and have
+L<https://pkg.go.dev/regexp/syntax>.
-perl installed you can read it with:
+
+If you  want to  read a more  comprehensive documentation  about the
+topic and have perl installed you can read it with:
 
     perldoc perlre
 
-Or read it online: L<https://perldoc.perl.org/perlre>.
+Or read it online: L<https://perldoc.perl.org/perlre>. But please note
+that the GO regexp engine does NOT support all perl regex terms,
+especially look-ahead and look-behind.
 
-A note on  modifiers: the regexp engine used in  tablizer uses another
+If you want to supply flags to a regex, then surround it with slashes
-modifier syntax:
+and append the flag. The following flags are supported:
 
-    (?MODIFIER)
+    i => case insensitive
-
+    ! => negative match
-The most important modifiers are:
-
-C<i> ignore case
-C<m> multiline mode
-C<s> single line mode
 
 Example for a case insensitive search:
 
-    kubectl get pods -A | tablizer "(?i)account"
+    kubectl get pods -A | tablizer "/account/i"
 
-You  can use  the experimental  fuzzy search  feature by  providing the
+If you use the C<!> flag, then the regex match will be negated, that
+is, if a line in the input matches the given regex, but C<!> is
+supplied, tablizer will NOT include it in the output.
+
+For example, here we want to get all lines matching "foo" but not
+"bar":
+
+    cat table | tablizer foo '/bar/!'
+
+This would match a line "foo zorro" but not "foo bar".
+
+The flags can also be combined.
+
+You  can also 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.
 
@@ -203,6 +226,46 @@ We want to see only the CMD column and use a regex for this:
 
 where "C" is our regexp which matches CMD.
 
+If a column specifier doesn't look like a regular expression, matching
+against header  fields will  be case  insensitive. So,  if you  have a
+field with  the name C<ID> then  these will all match:  C<-c id>, C<-c
+Id>. The same rule applies to the options C<-T> and C<-F>.
+
+
+=head2 TRANSPOSE FIELDS USING REGEXPS
+
+You can manipulate field contents using regular expressions. You have
+to tell tablizer which field[s] to operate on using the option C<-T>
+and the search/replace pattern using C<-R>. The number of columns and
+patterns must match.
+
+A search/replace pattern consists of the following elements:
+
+    /search-regexp/replace-string/
+
+The separator can be any valid character. Especially if you want to
+use a regexp containing the C</> character, eg:
+
+    |search-regexp|replace-string|
+
+Example:
+    
+    cat t/testtable2
+    NAME  DURATION
+    x     10
+    a     100
+    z     0
+    u     4
+    k     6
+    
+    cat t/testtable2 | tablizer -T2 -R '/^\d/4/' -n
+    NAME    DURATION 
+    x       40      
+    a       400     
+    z       4       
+    u       4       
+    k       4  
+
 =head2 OUTPUT MODES
 
 There might be cases  when the tabular output of a  program is way too
@@ -341,6 +404,8 @@ 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
 
 In order to report a bug, unexpected behavior, feature requests