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|
package formatter
import (
"fmt"
"regexp"
"strings"
)
const COLS = 80
type ColorMode uint8
const (
ColorModeNone ColorMode = iota
ColorModeTerminal
ColorModePassthrough
)
var SingletonFormatter = New(ColorModeTerminal)
func F(format string, args ...interface{}) string {
return SingletonFormatter.F(format, args...)
}
func Fi(indentation uint, format string, args ...interface{}) string {
return SingletonFormatter.Fi(indentation, format, args...)
}
func Fiw(indentation uint, maxWidth uint, format string, args ...interface{}) string {
return SingletonFormatter.Fiw(indentation, maxWidth, format, args...)
}
type Formatter struct {
ColorMode ColorMode
colors map[string]string
styleRe *regexp.Regexp
preserveColorStylingTags bool
}
func NewWithNoColorBool(noColor bool) Formatter {
if noColor {
return New(ColorModeNone)
}
return New(ColorModeTerminal)
}
func New(colorMode ColorMode) Formatter {
f := Formatter{
ColorMode: colorMode,
colors: map[string]string{
"/": "\x1b[0m",
"bold": "\x1b[1m",
"underline": "\x1b[4m",
"red": "\x1b[38;5;9m",
"orange": "\x1b[38;5;214m",
"coral": "\x1b[38;5;204m",
"magenta": "\x1b[38;5;13m",
"green": "\x1b[38;5;10m",
"dark-green": "\x1b[38;5;28m",
"yellow": "\x1b[38;5;11m",
"light-yellow": "\x1b[38;5;228m",
"cyan": "\x1b[38;5;14m",
"gray": "\x1b[38;5;243m",
"light-gray": "\x1b[38;5;246m",
"blue": "\x1b[38;5;12m",
},
}
colors := []string{}
for color := range f.colors {
colors = append(colors, color)
}
f.styleRe = regexp.MustCompile("{{(" + strings.Join(colors, "|") + ")}}")
return f
}
func (f Formatter) F(format string, args ...interface{}) string {
return f.Fi(0, format, args...)
}
func (f Formatter) Fi(indentation uint, format string, args ...interface{}) string {
return f.Fiw(indentation, 0, format, args...)
}
func (f Formatter) Fiw(indentation uint, maxWidth uint, format string, args ...interface{}) string {
out := fmt.Sprintf(f.style(format), args...)
if indentation == 0 && maxWidth == 0 {
return out
}
lines := strings.Split(out, "\n")
if maxWidth != 0 {
outLines := []string{}
maxWidth = maxWidth - indentation*2
for _, line := range lines {
if f.length(line) <= maxWidth {
outLines = append(outLines, line)
continue
}
outWords := []string{}
length := uint(0)
words := strings.Split(line, " ")
for _, word := range words {
wordLength := f.length(word)
if length+wordLength <= maxWidth {
length += wordLength
outWords = append(outWords, word)
continue
}
outLines = append(outLines, strings.Join(outWords, " "))
outWords = []string{word}
length = wordLength
}
if len(outWords) > 0 {
outLines = append(outLines, strings.Join(outWords, " "))
}
}
lines = outLines
}
if indentation == 0 {
return strings.Join(lines, "\n")
}
padding := strings.Repeat(" ", int(indentation))
for i := range lines {
if lines[i] != "" {
lines[i] = padding + lines[i]
}
}
return strings.Join(lines, "\n")
}
func (f Formatter) length(styled string) uint {
n := uint(0)
inStyle := false
for _, b := range styled {
if inStyle {
if b == 'm' {
inStyle = false
}
continue
}
if b == '\x1b' {
inStyle = true
continue
}
n += 1
}
return n
}
func (f Formatter) CycleJoin(elements []string, joiner string, cycle []string) string {
if len(elements) == 0 {
return ""
}
n := len(cycle)
out := ""
for i, text := range elements {
out += cycle[i%n] + text
if i < len(elements)-1 {
out += joiner
}
}
out += "{{/}}"
return f.style(out)
}
func (f Formatter) style(s string) string {
switch f.ColorMode {
case ColorModeNone:
return f.styleRe.ReplaceAllString(s, "")
case ColorModePassthrough:
return s
case ColorModeTerminal:
return f.styleRe.ReplaceAllStringFunc(s, func(match string) string {
if out, ok := f.colors[strings.Trim(match, "{}")]; ok {
return out
}
return match
})
}
return ""
}
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