Add PrintFunc.. functions and update readme.md

README.md

@@ -4,6 +4,7 @@ Color let you use colorized outputs in terms of [ANSI Escape
 Codes](http://en.wikipedia.org/wiki/ANSI_escape_code#Colors). The API can be
 used in several way, pick one one that suits you.
 
+The package is under ongoing development, checkout for regular updates.
 
 ## Install
 
@@ -51,6 +52,19 @@ whiteBackground := red.Add(color.BgWhite)
 whiteBackground.Println("Red text with White background.")
 ```
 
+### Custom print functions
+
+```go
+// Create a custom print function for convenient
+red := color.New(color.FgRed).PrintfFunc()
+red("warning")
+red("error: %s", err)
+
+// Mix up multiple attributes
+notice := color.New(color.Bold, color.FgGreen).PrintlnFunc()
+notice("don't forget this...")
+```
+
 ### Plug into existing code
 
 ```go
@@ -71,8 +85,8 @@ fmt.Println("All text will be now bold magenta.")
 
 ## Todo
 
-* Add partial coloring of lines.
+* Save/Return previous values
-* Save/Return previous values 
+* Implement SprintXxx functions()
 
 ## Credits
 

color.go

@@ -128,6 +128,32 @@ func (c *Color) Println(a ...interface{}) (n int, err error) {
 	return fmt.Fprintln(Output, a...)
 }
 
+func (c *Color) Sprintln() func(a ...interface{}) string {
+	return func(a ...interface{}) string {
+		c.Set()
+		defer Unset()
+		return fmt.Sprintln(a...)
+	}
+}
+
+// PrintFunc returns a new function prints the passed arguments as colorized
+// with color.Print().
+func (c *Color) PrintFunc() func(a ...interface{}) {
+	return func(a ...interface{}) { c.Print(a...) }
+}
+
+// PrintfFunc returns a new function prints the passed arguments as colorized
+// with color.Printf().
+func (c *Color) PrintfFunc() func(format string, a ...interface{}) {
+	return func(format string, a ...interface{}) { c.Printf(format, a...) }
+}
+
+// PrintlnFunc returns a new function prints the passed arguments as colorized
+// with color.Println().
+func (c *Color) PrintlnFunc() func(a ...interface{}) {
+	return func(a ...interface{}) { c.Println(a...) }
+}
+
 // sequence returns a formated SGR sequence to be plugged into a "\x1b[...m"
 // an example output might be: "1;36" -> bold cyan
 func (c *Color) sequence() string {

color_test.go

@@ -87,6 +87,7 @@ func TestColor(t *testing.T) {
 	White("white")
 
 	// Third visual test
+	fmt.Println()
 	Set(FgBlue)
 	fmt.Println("is this blue?")
 	Unset()
@@ -95,4 +96,12 @@ func TestColor(t *testing.T) {
 	fmt.Println("and this magenta?")
 	Unset()
 
+	// Fourth Visual test
+	fmt.Println()
+	blue := New(FgBlue).PrintlnFunc()
+	blue("blue text with custom print func")
+
+	red := New(FgRed).PrintfFunc()
+	red("red text with a printf func: %d\n", 123)
+
 }

doc.go

@@ -39,6 +39,18 @@ separate color object.
     whiteBackground.Println("Red text with White background.")
 
 
+You can create PrintXxx functions to simplify even more:
+
+    // Create a custom print function for convenient
+    red := color.New(color.FgRed).PrintfFunc()
+    red("warning")
+    red("error: %s", err)
+
+    // Mix up multiple attributes
+    notice := color.New(color.Bold, color.FgGreen).PrintlnFunc()
+    notice("don't forget this...")
+
+
 Using with existing color is possible too. Just use the Set() method to set
 the standard output to the given parameters. That way a rewrite of an existing
 code is not required.