add json output mode (-J) (#87)

cfg/config.go

@@ -28,7 +28,7 @@ import (
 )
 
 const (
-	Version  = "v1.5.10"
+	Version  = "v1.5.11"
 	MAXPARTS = 2
 )
 
@@ -141,6 +141,7 @@ type Modeflag struct {
 	Y bool
 	A bool
 	C bool
+	J bool
 }
 
 // used for switching printers
@@ -152,6 +153,7 @@ const (
 	Yaml
 	CSV
 	ASCII
+	Json
 )
 
 // various sort types
@@ -290,6 +292,8 @@ func (conf *Config) PrepareModeFlags(flag Modeflag) {
 		conf.OutputMode = Yaml
 	case flag.C:
 		conf.OutputMode = CSV
+	case flag.J:
+		conf.OutputMode = Json
 	default:
 		conf.OutputMode = ASCII
 	}

cmd/root.go

@@ -135,13 +135,13 @@ func Execute() {
 		"Transpose the speficied columns (separated by ,)")
 	rootCmd.PersistentFlags().BoolVarP(&conf.Interactive, "interactive", "I", false,
 		"interactive mode")
-	rootCmd.PersistentFlags().StringVarP(&conf.OFS, "ofs", "", "",
+	rootCmd.PersistentFlags().StringVarP(&conf.OFS, "ofs", "o", "",
 		"Output field separator (' ' for ascii table, ',' for CSV)")
 	rootCmd.PersistentFlags().BoolVarP(&conf.InputJSON, "json", "j", false,
 		"JSON input mode")
-	rootCmd.PersistentFlags().BoolVarP(&conf.AutoHeaders, "auto-headers", "", false,
+	rootCmd.PersistentFlags().BoolVarP(&conf.AutoHeaders, "auto-headers", "g", false,
 		"Generate headers automatically")
-	rootCmd.PersistentFlags().StringVarP(&headers, "custom-headers", "", "",
+	rootCmd.PersistentFlags().StringVarP(&headers, "custom-headers", "x", "",
 		"Custom headers")
 
 	// sort options
@@ -171,6 +171,8 @@ func Execute() {
 		"Enable shell mode output")
 	rootCmd.PersistentFlags().BoolVarP(&modeflag.Y, "yaml", "Y", false,
 		"Enable yaml output")
+	rootCmd.PersistentFlags().BoolVarP(&modeflag.J, "jsonout", "J", false,
+		"Enable json output")
 	rootCmd.PersistentFlags().BoolVarP(&modeflag.C, "csv", "C", false,
 		"Enable CSV output")
 	rootCmd.PersistentFlags().BoolVarP(&modeflag.A, "ascii", "A", false,

cmd/shortusage.go

@@ -1,16 +1,18 @@
 package cmd
 
 const shortusage = `tablizer [regex,...] [-r file] [flags]
--c col,...   show specified columns                -L  highlight matching lines
+-c col,...   show specified columns                  -L  highlight matching lines
--k col,...   sort by specified columns             -j  read JSON input
+-k col,...   sort by specified columns               -j  read JSON input
--F col=reg   filter field with regexp              -v  invert match
+-F col=reg   filter field with regexp                -v  invert match
--T col,...   transpose specified columns           -n  numberize columns
+-T col,...   transpose specified columns             -n  numberize columns
--R /from/to/ apply replacement to columns in -T    -N  do not use colors
+-R /from/to/ apply replacement to columns in -T      -N  do not use colors
--y col,...   yank columns to clipboard             -H  do not show headers
+-y col,...   yank columns to clipboard               -H  do not show headers
---ofs char   output field separator                -s  specify field separator
+--ofs char   output field separator                  -s  specify field separator
--r file      read input from file                  -z  use fuzzy search
+-r file      read input from file                    -z  use fuzzy search
--f file      read config from file                 -I  interactive filter mode
+-f file      read config from file                   -I  interactive filter mode
-                                                   -d  debug
+-x col,...   use custom headers                      -d  debug
--O org -C CSV -M md -X ext -S shell -Y yaml        -D  sort descending order
+-o char      use char as output separator            -g  auto generate headers
--m  show manual       --help  show detailed help   -v  show version
+
--a  sort by age       -i      sort numerically     -t  sort by time`
+-O org -C CSV -M md -X ext -S shell -Y yaml -J json  -D  sort descending order
+-m  show manual       --help  show detailed help     -v  show version
+-a  sort by age       -i      sort numerically       -t  sort by time`

cmd/tablizer.go

@@ -22,8 +22,8 @@ SYNOPSIS
           -R, --regex-transposer </from/to/> Apply /search/replace/ regexp to fields given in -T
           -j, --json                         Read JSON input (must be array of hashes)
           -I, --interactive                  Interactively filter and select rows
-              --auto-headers                 Generate headers if there are none present in input
+          -g, --auto-headers                 Generate headers if there are none present in input
-              --custom-headers a,b,...       Use custom headers, separated by comma
+          -x, --custom-headers a,b,...       Use custom headers, separated by comma
 
         Output Flags (mutually exclusive):
           -X, --extended                     Enable extended output
@@ -31,12 +31,13 @@ SYNOPSIS
           -O, --orgtbl                       Enable org-mode table output
           -S, --shell                        Enable shell evaluable output
           -Y, --yaml                         Enable yaml output
+          -J, --jsonout                      Enable JSON output
           -C, --csv                          Enable CSV output
           -A, --ascii                        Default output mode, ascii tabular
           -L, --hightlight-lines             Use alternating background colors for tables
+          -o, --ofs <char>                   Output field separator, used by -A and -C. 
           -y, --yank-columns                 Yank specified columns (separated by ,) to clipboard,
                                              space separated
-              --ofs <char>                   Output field separator, used by -A and -C. 
 
         Sort Mode Flags (mutually exclusive):
           -a, --sort-age                     sort according to age (duration) string
@@ -519,8 +520,8 @@ Operational Flags:
   -R, --regex-transposer </from/to/> Apply /search/replace/ regexp to fields given in -T
   -j, --json                         Read JSON input (must be array of hashes)
   -I, --interactive                  Interactively filter and select rows
-      --auto-headers                 Generate headers if there are none present in input
+  -g, --auto-headers                 Generate headers if there are none present in input
-      --custom-headers a,b,...       Use custom headers, separated by comma
+  -x, --custom-headers a,b,...       Use custom headers, separated by comma
 
 Output Flags (mutually exclusive):
   -X, --extended                     Enable extended output
@@ -528,12 +529,13 @@ Output Flags (mutually exclusive):
   -O, --orgtbl                       Enable org-mode table output
   -S, --shell                        Enable shell evaluable output
   -Y, --yaml                         Enable yaml output
+  -J, --jsonout                      Enable JSON output
   -C, --csv                          Enable CSV output
   -A, --ascii                        Default output mode, ascii tabular
   -L, --hightlight-lines             Use alternating background colors for tables
+  -o, --ofs <char>                   Output field separator, used by -A and -C. 
   -y, --yank-columns                 Yank specified columns (separated by ,) to clipboard,
                                      space separated
-      --ofs <char>                   Output field separator, used by -A and -C. 
 
 Sort Mode Flags (mutually exclusive):
   -a, --sort-age                     sort according to age (duration) string

lib/printer.go

@@ -19,6 +19,7 @@ package lib
 
 import (
 	"encoding/csv"
+	"encoding/json"
 	"fmt"
 	"io"
 	"log"
@@ -61,6 +62,8 @@ func printData(writer io.Writer, conf cfg.Config, data *Tabdata) {
 		printShellData(writer, data)
 	case cfg.Yaml:
 		printYamlData(writer, data)
+	case cfg.Json:
+		printJsonData(writer, data)
 	case cfg.CSV:
 		printCSVData(writer, conf, data)
 	default:
@@ -291,6 +294,35 @@ func printShellData(writer io.Writer, data *Tabdata) {
 	output(writer, out)
 }
 
+func printJsonData(writer io.Writer, data *Tabdata) {
+	objlist := make([]map[string]any, len(data.entries))
+
+	if len(data.entries) > 0 {
+		for i, entry := range data.entries {
+			obj := make(map[string]any, len(entry))
+
+			for idx, value := range entry {
+				num, err := strconv.Atoi(value)
+				if err == nil {
+					obj[data.headers[idx]] = num
+				} else {
+					obj[data.headers[idx]] = value
+				}
+			}
+
+			objlist[i] = obj
+		}
+	}
+
+	jsonstr, err := json.MarshalIndent(&objlist, "", "  ")
+
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	output(writer, string(jsonstr))
+}
+
 func printYamlData(writer io.Writer, data *Tabdata) {
 	type Data struct {
 		Entries []map[string]interface{} `yaml:"entries"`

lib/printer_test.go

@@ -125,6 +125,31 @@ ceta,33d12h,9,06/Jan/2008 15:04:05 -0700`,
 NAME="beta" DURATION="1d10h5m1s" COUNT="33" WHEN="3/1/2014"
 NAME="alpha" DURATION="4h35m" COUNT="170" WHEN="2013-Feb-03"
 NAME="ceta" DURATION="33d12h" COUNT="9" WHEN="06/Jan/2008 15:04:05 -0700"`,
+	},
+	{
+		name:      "json",
+		mode:      cfg.Json,
+		numberize: false,
+		expect: `[
+  {
+    "COUNT": 33,
+    "DURATION": "1d10h5m1s",
+    "NAME": "beta",
+    "WHEN": "3/1/2014"
+  },
+  {
+    "COUNT": 170,
+    "DURATION": "4h35m",
+    "NAME": "alpha",
+    "WHEN": "2013-Feb-03"
+  },
+  {
+    "COUNT": 9,
+    "DURATION": "33d12h",
+    "NAME": "ceta",
+    "WHEN": "06/Jan/2008 15:04:05 -0700"
+  }
+]`,
 	},
 	{
 		name:      "yaml",

tablizer.1

@@ -133,7 +133,7 @@
 .\" ========================================================================
 .\"
 .IX Title "TABLIZER 1"
-.TH TABLIZER 1 "2025-10-10" "1" "User Commands"
+.TH TABLIZER 1 "2025-10-13" "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
@@ -160,8 +160,8 @@ tablizer \- Manipulate tabular output of other programs
 \&      \-R, \-\-regex\-transposer </from/to/> Apply /search/replace/ regexp to fields given in \-T
 \&      \-j, \-\-json                         Read JSON input (must be array of hashes)
 \&      \-I, \-\-interactive                  Interactively filter and select rows
-\&          \-\-auto\-headers                 Generate headers if there are none present in input
+\&      \-g, \-\-auto\-headers                 Generate headers if there are none present in input
-\&          \-\-custom\-headers a,b,...       Use custom headers, separated by comma
+\&      \-x, \-\-custom\-headers a,b,...       Use custom headers, separated by comma
 \&
 \&    Output Flags (mutually exclusive):
 \&      \-X, \-\-extended                     Enable extended output
@@ -169,12 +169,13 @@ tablizer \- Manipulate tabular output of other programs
 \&      \-O, \-\-orgtbl                       Enable org\-mode table output
 \&      \-S, \-\-shell                        Enable shell evaluable output
 \&      \-Y, \-\-yaml                         Enable yaml output
+\&      \-J, \-\-jsonout                      Enable JSON output
 \&      \-C, \-\-csv                          Enable CSV output
 \&      \-A, \-\-ascii                        Default output mode, ascii tabular
 \&      \-L, \-\-hightlight\-lines             Use alternating background colors for tables
+\&      \-o, \-\-ofs <char>                   Output field separator, used by \-A and \-C. 
 \&      \-y, \-\-yank\-columns                 Yank specified columns (separated by ,) to clipboard,
 \&                                         space separated
-\&          \-\-ofs <char>                   Output field separator, used by \-A and \-C. 
 \&
 \&    Sort Mode Flags (mutually exclusive):
 \&      \-a, \-\-sort\-age                     sort according to age (duration) string

tablizer.pod

@@ -21,8 +21,8 @@ tablizer - Manipulate tabular output of other programs
       -R, --regex-transposer </from/to/> Apply /search/replace/ regexp to fields given in -T
       -j, --json                         Read JSON input (must be array of hashes)
       -I, --interactive                  Interactively filter and select rows
-          --auto-headers                 Generate headers if there are none present in input
+      -g, --auto-headers                 Generate headers if there are none present in input
-          --custom-headers a,b,...       Use custom headers, separated by comma
+      -x, --custom-headers a,b,...       Use custom headers, separated by comma
 
     Output Flags (mutually exclusive):
       -X, --extended                     Enable extended output
@@ -30,12 +30,13 @@ tablizer - Manipulate tabular output of other programs
       -O, --orgtbl                       Enable org-mode table output
       -S, --shell                        Enable shell evaluable output
       -Y, --yaml                         Enable yaml output
+      -J, --jsonout                      Enable JSON output
       -C, --csv                          Enable CSV output
       -A, --ascii                        Default output mode, ascii tabular
       -L, --hightlight-lines             Use alternating background colors for tables
+      -o, --ofs <char>                   Output field separator, used by -A and -C. 
       -y, --yank-columns                 Yank specified columns (separated by ,) to clipboard,
                                          space separated
-          --ofs <char>                   Output field separator, used by -A and -C. 
 
     Sort Mode Flags (mutually exclusive):
       -a, --sort-age                     sort according to age (duration) string