mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-10-19 07:55:07 +00:00
136 lines
4.4 KiB
Go
136 lines
4.4 KiB
Go
|
/*
|
||
|
Package color is an ANSI color package to output colorized or SGR defined
|
||
|
output to the standard output. The API can be used in several way, pick one
|
||
|
that suits you.
|
||
|
|
||
|
Use simple and default helper functions with predefined foreground colors:
|
||
|
|
||
|
color.Cyan("Prints text in cyan.")
|
||
|
|
||
|
// a newline will be appended automatically
|
||
|
color.Blue("Prints %s in blue.", "text")
|
||
|
|
||
|
// More default foreground colors..
|
||
|
color.Red("We have red")
|
||
|
color.Yellow("Yellow color too!")
|
||
|
color.Magenta("And many others ..")
|
||
|
|
||
|
// Hi-intensity colors
|
||
|
color.HiGreen("Bright green color.")
|
||
|
color.HiBlack("Bright black means gray..")
|
||
|
color.HiWhite("Shiny white color!")
|
||
|
|
||
|
However there are times where custom color mixes are required. Below are some
|
||
|
examples to create custom color objects and use the print functions of each
|
||
|
separate color object.
|
||
|
|
||
|
// Create a new color object
|
||
|
c := color.New(color.FgCyan).Add(color.Underline)
|
||
|
c.Println("Prints cyan text with an underline.")
|
||
|
|
||
|
// Or just add them to New()
|
||
|
d := color.New(color.FgCyan, color.Bold)
|
||
|
d.Printf("This prints bold cyan %s\n", "too!.")
|
||
|
|
||
|
|
||
|
// Mix up foreground and background colors, create new mixes!
|
||
|
red := color.New(color.FgRed)
|
||
|
|
||
|
boldRed := red.Add(color.Bold)
|
||
|
boldRed.Println("This will print text in bold red.")
|
||
|
|
||
|
whiteBackground := red.Add(color.BgWhite)
|
||
|
whiteBackground.Println("Red text with White background.")
|
||
|
|
||
|
// Use your own io.Writer output
|
||
|
color.New(color.FgBlue).Fprintln(myWriter, "blue color!")
|
||
|
|
||
|
blue := color.New(color.FgBlue)
|
||
|
blue.Fprint(myWriter, "This will print text in blue.")
|
||
|
|
||
|
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...")
|
||
|
|
||
|
You can also FprintXxx functions to pass your own io.Writer:
|
||
|
|
||
|
blue := color.New(FgBlue).FprintfFunc()
|
||
|
blue(myWriter, "important notice: %s", stars)
|
||
|
|
||
|
// Mix up with multiple attributes
|
||
|
success := color.New(color.Bold, color.FgGreen).FprintlnFunc()
|
||
|
success(myWriter, don't forget this...")
|
||
|
|
||
|
|
||
|
Or create SprintXxx functions to mix strings with other non-colorized strings:
|
||
|
|
||
|
yellow := New(FgYellow).SprintFunc()
|
||
|
red := New(FgRed).SprintFunc()
|
||
|
|
||
|
fmt.Printf("this is a %s and this is %s.\n", yellow("warning"), red("error"))
|
||
|
|
||
|
info := New(FgWhite, BgGreen).SprintFunc()
|
||
|
fmt.Printf("this %s rocks!\n", info("package"))
|
||
|
|
||
|
Windows support is enabled by default. All Print functions work as intended.
|
||
|
However only for color.SprintXXX functions, user should use fmt.FprintXXX and
|
||
|
set the output to color.Output:
|
||
|
|
||
|
fmt.Fprintf(color.Output, "Windows support: %s", color.GreenString("PASS"))
|
||
|
|
||
|
info := New(FgWhite, BgGreen).SprintFunc()
|
||
|
fmt.Fprintf(color.Output, "this %s rocks!\n", info("package"))
|
||
|
|
||
|
Using with existing code is possible. 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.
|
||
|
|
||
|
// Use handy standard colors.
|
||
|
color.Set(color.FgYellow)
|
||
|
|
||
|
fmt.Println("Existing text will be now in Yellow")
|
||
|
fmt.Printf("This one %s\n", "too")
|
||
|
|
||
|
color.Unset() // don't forget to unset
|
||
|
|
||
|
// You can mix up parameters
|
||
|
color.Set(color.FgMagenta, color.Bold)
|
||
|
defer color.Unset() // use it in your function
|
||
|
|
||
|
fmt.Println("All text will be now bold magenta.")
|
||
|
|
||
|
There might be a case where you want to disable color output (for example to
|
||
|
pipe the standard output of your app to somewhere else). `Color` has support to
|
||
|
disable colors both globally and for single color definition. For example
|
||
|
suppose you have a CLI app and a `--no-color` bool flag. You can easily disable
|
||
|
the color output with:
|
||
|
|
||
|
var flagNoColor = flag.Bool("no-color", false, "Disable color output")
|
||
|
|
||
|
if *flagNoColor {
|
||
|
color.NoColor = true // disables colorized output
|
||
|
}
|
||
|
|
||
|
You can also disable the color by setting the NO_COLOR environment variable to any value.
|
||
|
|
||
|
It also has support for single color definitions (local). You can
|
||
|
disable/enable color output on the fly:
|
||
|
|
||
|
c := color.New(color.FgCyan)
|
||
|
c.Println("Prints cyan text")
|
||
|
|
||
|
c.DisableColor()
|
||
|
c.Println("This is printed without any color")
|
||
|
|
||
|
c.EnableColor()
|
||
|
c.Println("This prints again cyan...")
|
||
|
*/
|
||
|
package color
|