Add a function to force color in console output

README.md

@@ -215,9 +215,6 @@ $ go build -tags=jsoniter .
 
 ```go
 func main() {
-	// Disable Console Color
-	// gin.DisableConsoleColor()
-
 	// Creates a gin router with default middleware:
 	// logger and recovery (crash-free) middleware
 	router := gin.Default()
@@ -570,6 +567,48 @@ func main() {
 ::1 - [Fri, 07 Dec 2018 17:04:38 JST] "GET /ping HTTP/1.1 200 122.767µs "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.80 Safari/537.36" "
 ```
 
+### Controlling Log output coloring 
+
+By default, logs output on console should be colorized depending on the detected TTY.
+
+Never colorize logs: 
+
+```go
+func main() {
+    // Disable log's color
+    gin.DisableConsoleColor()
+    
+    // Creates a gin router with default middleware:
+    // logger and recovery (crash-free) middleware
+    router := gin.Default()
+    
+    router.GET("/ping", func(c *gin.Context) {
+        c.String(200, "pong")
+    })
+    
+    router.Run(":8080")
+}
+```
+
+Always colorize logs: 
+
+```go
+func main() {
+    // Force log's color
+    gin.ForceConsoleColor()
+    
+    // Creates a gin router with default middleware:
+    // logger and recovery (crash-free) middleware
+    router := gin.Default()
+    
+    router.GET("/ping", func(c *gin.Context) {
+        c.String(200, "pong")
+    })
+    
+    router.Run(":8080")
+}
+```
+
 ### Model binding and validation
 
 To bind a request body into a type, use model binding. We currently support binding of JSON, XML, YAML and standard form values (foo=bar&boo=baz).

logger.go

@@ -24,6 +24,7 @@ var (
 	cyan         = string([]byte{27, 91, 57, 55, 59, 52, 54, 109})
 	reset        = string([]byte{27, 91, 48, 109})
 	disableColor = false
+	forceColor   = false
 )
 
 // LoggerConfig defines the config for Logger middleware.
@@ -90,6 +91,11 @@ func DisableConsoleColor() {
 	disableColor = true
 }
 
+// ForceConsoleColor force color output in the console.
+func ForceConsoleColor() {
+	forceColor = true
+}
+
 // ErrorLogger returns a handlerfunc for any error type.
 func ErrorLogger() HandlerFunc {
 	return ErrorLoggerT(ErrorTypeAny)
@@ -144,9 +150,9 @@ func LoggerWithConfig(conf LoggerConfig) HandlerFunc {
 
 	isTerm := true
 
-	if w, ok := out.(*os.File); !ok ||
+	if w, ok := out.(*os.File); (!ok ||
 		(os.Getenv("TERM") == "dumb" || (!isatty.IsTerminal(w.Fd()) && !isatty.IsCygwinTerminal(w.Fd()))) ||
-		disableColor {
+		disableColor) && !forceColor {
 		isTerm = false
 	}
 

logger_test.go

@@ -340,3 +340,10 @@ func TestDisableConsoleColor(t *testing.T) {
 	DisableConsoleColor()
 	assert.True(t, disableColor)
 }
+
+func TestForceConsoleColor(t *testing.T) {
+	New()
+	assert.False(t, forceColor)
+	ForceConsoleColor()
+	assert.True(t, forceColor)
+}