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// colorstring provides functions for colorizing strings for terminal
// output.
package colorstring
import (
"bytes"
"fmt"
"io"
"regexp"
"strings"
)
// Color colorizes your strings using the default settings.
//
// Strings given to Color should use the syntax `[color]` to specify the
// color for text following. For example: `[blue]Hello` will return "Hello"
// in blue. See DefaultColors for all the supported colors and attributes.
//
// If an unrecognized color is given, it is ignored and assumed to be part
// of the string. For example: `[hi]world` will result in "[hi]world".
//
// A color reset is appended to the end of every string. This will reset
// the color of following strings when you output this text to the same
// terminal session.
//
// If you want to customize any of this behavior, use the Colorize struct.
func Color(v string) string {
return def.Color(v)
}
// ColorPrefix returns the color sequence that prefixes the given text.
//
// This is useful when wrapping text if you want to inherit the color
// of the wrapped text. For example, "[green]foo" will return "[green]".
// If there is no color sequence, then this will return "".
func ColorPrefix(v string) string {
return def.ColorPrefix(v)
}
// Colorize colorizes your strings, giving you the ability to customize
// some of the colorization process.
//
// The options in Colorize can be set to customize colorization. If you're
// only interested in the defaults, just use the top Color function directly,
// which creates a default Colorize.
type Colorize struct {
// Colors maps a color string to the code for that color. The code
// is a string so that you can use more complex colors to set foreground,
// background, attributes, etc. For example, "boldblue" might be
// "1;34"
Colors map[string]string
// If true, color attributes will be ignored. This is useful if you're
// outputting to a location that doesn't support colors and you just
// want the strings returned.
Disable bool
// Reset, if true, will reset the color after each colorization by
// adding a reset code at the end.
Reset bool
}
// Color colorizes a string according to the settings setup in the struct.
//
// For more details on the syntax, see the top-level Color function.
func (c *Colorize) Color(v string) string {
matches := parseRe.FindAllStringIndex(v, -1)
if len(matches) == 0 {
return v
}
result := new(bytes.Buffer)
colored := false
m := []int{0, 0}
for _, nm := range matches {
// Write the text in between this match and the last
result.WriteString(v[m[1]:nm[0]])
m = nm
var replace string
if code, ok := c.Colors[v[m[0]+1:m[1]-1]]; ok {
colored = true
if !c.Disable {
replace = fmt.Sprintf("\033[%sm", code)
}
} else {
replace = v[m[0]:m[1]]
}
result.WriteString(replace)
}
result.WriteString(v[m[1]:])
if colored && c.Reset && !c.Disable {
// Write the clear byte at the end
result.WriteString("\033[0m")
}
return result.String()
}
// ColorPrefix returns the first color sequence that exists in this string.
//
// For example: "[green]foo" would return "[green]". If no color sequence
// exists, then "" is returned. This is especially useful when wrapping
// colored texts to inherit the color of the wrapped text.
func (c *Colorize) ColorPrefix(v string) string {
return prefixRe.FindString(strings.TrimSpace(v))
}
// DefaultColors are the default colors used when colorizing.
//
// If the color is surrounded in underscores, such as "_blue_", then that
// color will be used for the background color.
var DefaultColors map[string]string
func init() {
DefaultColors = map[string]string{
// Default foreground/background colors
"default": "39",
"_default_": "49",
// Foreground colors
"black": "30",
"red": "31",
"green": "32",
"yellow": "33",
"blue": "34",
"magenta": "35",
"cyan": "36",
"light_gray": "37",
"dark_gray": "90",
"light_red": "91",
"light_green": "92",
"light_yellow": "93",
"light_blue": "94",
"light_magenta": "95",
"light_cyan": "96",
"white": "97",
// Background colors
"_black_": "40",
"_red_": "41",
"_green_": "42",
"_yellow_": "43",
"_blue_": "44",
"_magenta_": "45",
"_cyan_": "46",
"_light_gray_": "47",
"_dark_gray_": "100",
"_light_red_": "101",
"_light_green_": "102",
"_light_yellow_": "103",
"_light_blue_": "104",
"_light_magenta_": "105",
"_light_cyan_": "106",
"_white_": "107",
// Attributes
"bold": "1",
"dim": "2",
"underline": "4",
"blink_slow": "5",
"blink_fast": "6",
"invert": "7",
"hidden": "8",
// Reset to reset everything to their defaults
"reset": "0",
"reset_bold": "21",
}
def = Colorize{
Colors: DefaultColors,
Reset: true,
}
}
var def Colorize
var parseReRaw = `\[[a-z0-9_-]+\]`
var parseRe = regexp.MustCompile(`(?i)` + parseReRaw)
var prefixRe = regexp.MustCompile(`^(?i)(` + parseReRaw + `)+`)
// Print is a convenience wrapper for fmt.Print with support for color codes.
//
// Print formats using the default formats for its operands and writes to
// standard output with support for color codes. Spaces are added between
// operands when neither is a string. It returns the number of bytes written
// and any write error encountered.
func Print(a string) (n int, err error) {
return fmt.Print(Color(a))
}
// Println is a convenience wrapper for fmt.Println with support for color
// codes.
//
// Println formats using the default formats for its operands and writes to
// standard output with support for color codes. Spaces are always added
// between operands and a newline is appended. It returns the number of bytes
// written and any write error encountered.
func Println(a string) (n int, err error) {
return fmt.Println(Color(a))
}
// Printf is a convenience wrapper for fmt.Printf with support for color codes.
//
// Printf formats according to a format specifier and writes to standard output
// with support for color codes. It returns the number of bytes written and any
// write error encountered.
func Printf(format string, a ...interface{}) (n int, err error) {
return fmt.Printf(Color(format), a...)
}
// Fprint is a convenience wrapper for fmt.Fprint with support for color codes.
//
// Fprint formats using the default formats for its operands and writes to w
// with support for color codes. Spaces are added between operands when neither
// is a string. It returns the number of bytes written and any write error
// encountered.
func Fprint(w io.Writer, a string) (n int, err error) {
return fmt.Fprint(w, Color(a))
}
// Fprintln is a convenience wrapper for fmt.Fprintln with support for color
// codes.
//
// Fprintln formats using the default formats for its operands and writes to w
// with support for color codes. Spaces are always added between operands and a
// newline is appended. It returns the number of bytes written and any write
// error encountered.
func Fprintln(w io.Writer, a string) (n int, err error) {
return fmt.Fprintln(w, Color(a))
}
// Fprintf is a convenience wrapper for fmt.Fprintf with support for color
// codes.
//
// Fprintf formats according to a format specifier and writes to w with support
// for color codes. It returns the number of bytes written and any write error
// encountered.
func Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
return fmt.Fprintf(w, Color(format), a...)
}
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