refactoring

main.go

@@ -14,6 +14,10 @@ import (
 	"github.com/fatih/color"
 )
 
+const (
+	DefaultOutput = "{0}"
+)
+
 var (
 	// regex with sub groups
 	input = flag.String("i", `^(.|\n)*?$`, "input pattern")
@@ -36,7 +40,7 @@ var (
 	//
 	// The following number mutators (integers and floats) are allowed:
 	// + - * / ^ %
-	output = flag.String("o", "{0}", "output pattern")
+	output = flag.String("o", DefaultOutput, "output pattern")
 
 	// don't ignore lines which do not match against input.
 	// they will be copied without any changes
@@ -60,19 +64,19 @@ func main() {
 		panic(err)
 	}
 
-	matchesWholeLine := strings.HasPrefix(*input, "^") && strings.HasSuffix(*input, "$")
+	reformatting := strings.HasPrefix(*input, "^") && strings.HasSuffix(*input, "$") && *output != DefaultOutput
 
-	if matchesWholeLine {
+	if reformatting {
 		escapedOutput := EscSeqReplacer.Replace(*output)
-		handleWholeLineRegex(pattern, escapedOutput)
+		reformatLine(pattern, escapedOutput)
 	} else {
-		handleInlineRegex(pattern)
+		colorCodeMatches(pattern)
 	}
 }
 
-// handleWholeLineRegex is using input pattern ot replace
+// reformatLine is using input pattern to replace
 // placeholders in output pattern with the given subgroups
-func handleWholeLineRegex(pattern *regexp.Regexp, output string) {
+func reformatLine(pattern *regexp.Regexp, output string) {
 	for line := range readLines(os.Stdin) {
 		matches := pattern.FindStringSubmatch(line)
 		if len(matches) == 0 {
@@ -85,9 +89,9 @@ func handleWholeLineRegex(pattern *regexp.Regexp, output string) {
 	}
 }
 
-// handleInlineRegex is using input pattern
+// colorCodeMatches is using input pattern
 // and color-codes all matches within input
-func handleInlineRegex(pattern *regexp.Regexp) {
+func colorCodeMatches(pattern *regexp.Regexp) {
 	c := color.New(color.FgRed, color.Bold)
 	for line := range readLines(os.Stdin) {
 		matches := pattern.FindAllStringIndex(line, -1)