added transpose function (-T + -R)

cfg/config.go

@@ -49,6 +49,11 @@ type Settings struct {
 	HighlightHdrBG string `hcl:"HighlightHdrBG"`
 }
 
+type Transposer struct {
+	Search  regexp.Regexp
+	Replace string
+}
+
 // internal config
 type Config struct {
 	Debug          bool
@@ -68,6 +73,11 @@ type Config struct {
 	SortDescending bool
 	SortByColumn   int
 
+	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
 	 see https://github.com/gookit/color.
@@ -283,6 +293,29 @@ func (conf *Config) PrepareFilters() error {
 	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(strings.Split(conf.TransposeColumns, ",")))
+	}
+
+	for _, transposer := range conf.Transposers {
+		parts := strings.Split(transposer, "/")
+		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
+}
+
 func (conf *Config) CheckEnv() {
 	// check for environment vars, command line flags have precedence,
 	// NO_COLOR is being checked by the color module itself.