Colorful log print

util.go

@@ -1,9 +1,12 @@
 package main
 
-import "fmt"
-import "os"
-import "runtime"
-import "path/filepath"
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+)
 
 // Go is a basic promise implementation: it wraps calls a function in a goroutine
 // and returns a channel which will later return the function's return value.
@@ -28,3 +31,61 @@ func Debugf(format string, a ...interface{}) {
 		fmt.Fprintf(os.Stderr, fmt.Sprintf("[debug] %s:%d %s\n", file, line, format), a...)
 	}
 }
+
+const (
+	Gray = uint8(iota + 90)
+	Red
+	Green
+	Yellow
+	Blue
+	Magenta
+	//NRed      = uint8(31) // Normal
+	EndColor = "\033[0m"
+)
+
+// colorLog colors log and print to stdout.
+// Log format: [<level>] <content [path]> [ error ].
+// Level: ERRO -> red; WARN -> Magenta; SUCC -> green; others -> default.
+// Content: default; path: yellow; error -> red.
+// Errors have to surrounded by "[ " and " ]"(space).
+func colorLog(format string, a ...interface{}) {
+	log := fmt.Sprintf(format, a...)
+	if runtime.GOOS != "windows" {
+		var clog string
+
+		// Level.
+		i := strings.Index(log, "]")
+		if log[0] == '[' && i > -1 {
+			clog += "[" + getColorLevel(log[1:i]) + "]"
+		}
+
+		log = log[i+1:]
+
+		// Error.
+		log = strings.Replace(log, "[ ", fmt.Sprintf("[ \033[%dm", Red), -1)
+		log = strings.Replace(log, " ]", EndColor+" ]", -1)
+
+		// Path.
+		log = strings.Replace(log, "(", fmt.Sprintf("(\033[%dm", Yellow), -1)
+		log = strings.Replace(log, ")", EndColor+")", -1)
+
+		log = clog + log
+	}
+
+	fmt.Print(log)
+}
+
+// getColorLevel returns colored level string by given level.
+func getColorLevel(level string) string {
+	level = strings.ToUpper(level)
+	switch level {
+	case "ERRO":
+		return fmt.Sprintf("\033[%dm%s\033[0m", Red, level)
+	case "WARN":
+		return fmt.Sprintf("\033[%dm%s\033[0m", Magenta, level)
+	case "SUCC":
+		return fmt.Sprintf("\033[%dm%s\033[0m", Green, level)
+	default:
+		return level
+	}
+}