Feature additions (#11)

* add color table support (using alternating colorization of rows) using new flag `-L`
* add config file support (HCL format) using `~/.config/tablizer/config` or `-f <file>` so the user can customize colors
* removed golang 1.17 support

cmd/root.go

@@ -92,6 +92,11 @@ func Execute() {
 			}
 
 			// Setup
+			err := conf.ParseConfigfile()
+			if err != nil {
+				return err
+			}
+
 			conf.CheckEnv()
 			conf.PrepareModeFlags(modeflag)
 			conf.PrepareSortFlags(sortmode)
@@ -99,7 +104,7 @@ func Execute() {
 			conf.ApplyDefaults()
 
 			// setup lisp env, load plugins etc
-			err := lib.SetupLisp(&conf)
+			err = lib.SetupLisp(&conf)
 			if err != nil {
 				return err
 			}
@@ -118,6 +123,7 @@ func Execute() {
 	rootCmd.PersistentFlags().BoolVarP(&conf.InvertMatch, "invert-match", "v", false, "select non-matching rows")
 	rootCmd.PersistentFlags().BoolVarP(&ShowManual, "man", "m", false, "Display manual page")
 	rootCmd.PersistentFlags().BoolVarP(&conf.UseFuzzySearch, "fuzzy", "z", false, "Use fuzzy searching")
+	rootCmd.PersistentFlags().BoolVarP(&conf.UseHighlight, "highlight-lines", "L", false, "Use alternating background colors")
 	rootCmd.PersistentFlags().StringVarP(&ShowCompletion, "completion", "", "", "Display completion code")
 	rootCmd.PersistentFlags().StringVarP(&conf.Separator, "separator", "s", cfg.DefaultSeparator, "Custom field separator")
 	rootCmd.PersistentFlags().StringVarP(&conf.Columns, "columns", "c", "", "Only show the speficied columns (separated by ,)")
@@ -145,6 +151,9 @@ func Execute() {
 	// 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)")
+
 	rootCmd.SetUsageTemplate(strings.TrimSpace(usage) + "\n")
 
 	err := rootCmd.Execute()

cmd/tablizer.go

@@ -22,10 +22,11 @@ SYNOPSIS
           -X, --extended           Enable extended output
           -M, --markdown           Enable markdown table output
           -O, --orgtbl             Enable org-mode table output
-          -S, --shell              Enable shell evaluable ouput
+          -S, --shell              Enable shell evaluable output
           -Y, --yaml               Enable yaml output
           -C, --csv                Enable CSV output
           -A, --ascii              Default output mode, ascii tabular
+          -L, --hightlight-lines   Use alternating background colors for tables
 
         Sort Mode Flags (mutually exclusive):
           -a, --sort-age           sort according to age (duration) string
@@ -35,10 +36,11 @@ SYNOPSIS
 
         Other Flags:
               --completion <shell> Generate the autocompletion script for <shell>
+          -f, --config <file>      Configuration file (default: ~/.config/tablizer/config)
           -d, --debug              Enable debugging
           -h, --help               help for tablizer
           -m, --man                Display manual page
-          -v, --version            Print program version
+          -V, --version            Print program version
 
 DESCRIPTION
     Many programs generate tabular output. But sometimes you need to
@@ -257,6 +259,36 @@ DESCRIPTION
 
         and source this file from your PowerShell profile.
 
+CONFIGURATION AND COLORS
+    YOu can put certain configuration values into a configuration file in
+    HCL format. By default tablizer looks for
+    "$HOME/.config/tablizer/config", but you can provide one using the
+    parameter "-f".
+
+    In the configuration the following variables can be defined:
+
+        BG             = "lightGreen"
+        FG             = "white"
+        HighlightBG    = "lightGreen"
+        HighlightFG    = "white"
+        NoHighlightBG  = "white"
+        NoHighlightFG  = "lightGreen"
+        HighlightHdrBG = "red"
+        HighlightHdrFG = "white"
+
+    The following color definitions are available:
+
+    black, blue, cyan, darkGray, default, green, lightBlue, lightCyan,
+    lightGreen, lightMagenta, lightRed, lightWhite, lightYellow, magenta,
+    red, white, yellow
+
+    The Variables FG and BG are being used to highlight matches. The other
+    *FG and *BG variables are for colored table output (enabled with the
+    "-L" parameter).
+
+    Colorization can be turned off completely either by setting the
+    parameter "-N" or the environment variable NO_COLOR to a true value.
+
 BUGS
     In order to report a bug, unexpected behavior, feature requests or to
     submit a patch, please open an issue on github:
@@ -313,10 +345,11 @@ Output Flags (mutually exclusive):
   -X, --extended           Enable extended output
   -M, --markdown           Enable markdown table output
   -O, --orgtbl             Enable org-mode table output
-  -S, --shell              Enable shell evaluable ouput
+  -S, --shell              Enable shell evaluable output
   -Y, --yaml               Enable yaml output
   -C, --csv                Enable CSV output
   -A, --ascii              Default output mode, ascii tabular
+  -L, --hightlight-lines   Use alternating background colors for tables
 
 Sort Mode Flags (mutually exclusive):
   -a, --sort-age           sort according to age (duration) string
@@ -326,12 +359,11 @@ Sort Mode Flags (mutually exclusive):
 
 Other Flags:
       --completion <shell> Generate the autocompletion script for <shell>
-  -l  --load-path <path>   Where to search for lisp plugins. Maybe a file or
-                           a directory containing files with *.zy extension
+  -f, --config <file>      Configuration file (default: ~/.config/tablizer/config)
   -d, --debug              Enable debugging
   -h, --help               help for tablizer
   -m, --man                Display manual page
-  -v, --version            Print program version
+  -V, --version            Print program version
 
 
 `