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render.go
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156 lines (144 loc) Β· 3.16 KB
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package main
import (
"fmt"
"strings"
"unicode/utf8"
)
const (
cCyan = 75
cBlue = 39
cMagenta = 170
cGreen = 76
cRed = 196
cYellow = 220
cOrange = 208
cGray = 242
)
func fc(color int, s string) string {
if s == "" {
return ""
}
s = strings.ReplaceAll(s, "%", "%%")
return fmt.Sprintf("%%F{%d}%s%%f", color, s)
}
type seg struct {
text string
order int
bg int
}
func stripColors(s string) string {
for _, prefix := range []string{"%F{", "%K{"} {
for {
idx := strings.Index(s, prefix)
if idx == -1 {
break
}
end := strings.Index(s[idx:], "}")
if end == -1 {
break
}
s = s[:idx] + s[idx+end+1:]
}
}
for _, esc := range []string{"%f", "%k"} {
s = strings.ReplaceAll(s, esc, "")
}
s = strings.ReplaceAll(s, "%%", "%")
return s
}
func escPercent(s string) string {
return strings.ReplaceAll(s, "%", "%%")
}
func contrastFg(bg int) int {
switch bg {
case 178, 136, 220, 3, 76, 2, 208:
return 0
default:
return 255
}
}
func renderPowerlineLeft(segs []seg, rainbow bool) string {
if len(segs) == 0 {
return ""
}
var b strings.Builder
if rainbow {
for i, s := range segs {
fg := contrastFg(s.bg)
plain := stripColors(s.text)
b.WriteString(fmt.Sprintf("%%K{%d}%%F{%d} %s ", s.bg, fg, escPercent(plain)))
if i < len(segs)-1 {
b.WriteString(fmt.Sprintf("%%F{%d}%%K{%d}\ue0b0", s.bg, segs[i+1].bg))
} else {
b.WriteString(fmt.Sprintf("%%f%%k%%F{%d}\ue0b0%%f", s.bg))
}
}
} else {
b.WriteString(fmt.Sprintf("%%K{%d}", 238))
for i, s := range segs {
b.WriteString(fmt.Sprintf(" %s ", s.text))
if i < len(segs)-1 {
b.WriteString(fmt.Sprintf("%%F{%d}\ue0b1%%f", 246))
}
}
b.WriteString(fmt.Sprintf("%%f%%k%%F{%d}\ue0b0%%f", 238))
}
return b.String()
}
func renderPowerlineRight(segs []seg, rainbow bool) string {
if len(segs) == 0 {
return ""
}
var b strings.Builder
if rainbow {
for _, s := range segs {
fg := contrastFg(s.bg)
plain := stripColors(s.text)
b.WriteString(fmt.Sprintf("%%F{%d}\ue0b2%%K{%d}%%F{%d} %s %%f", s.bg, s.bg, fg, escPercent(plain)))
}
b.WriteString("%k")
} else {
b.WriteString(fmt.Sprintf("%%F{%d}\ue0b2%%K{%d}", 238, 238))
for i, s := range segs {
b.WriteString(fmt.Sprintf(" %s ", s.text))
if i < len(segs)-1 {
b.WriteString(fmt.Sprintf("%%F{%d}\ue0b3%%f", 246))
}
}
b.WriteString("%f%k")
}
return b.String()
}
func visibleWidth(s string) int {
stripped := s
for _, prefix := range []string{"%F{", "%K{"} {
for {
idx := strings.Index(stripped, prefix)
if idx == -1 {
break
}
end := strings.Index(stripped[idx:], "}")
if end == -1 {
break
}
stripped = stripped[:idx] + stripped[idx+end+1:]
}
}
for _, esc := range []string{"%f", "%k"} {
stripped = strings.ReplaceAll(stripped, esc, "")
}
stripped = strings.ReplaceAll(stripped, "%%", "%")
return utf8.RuneCountInString(stripped)
}
func escShell(s string) string {
s = strings.ReplaceAll(s, "\\", "\\\\")
s = strings.ReplaceAll(s, "'", "\\'")
return s
}
func joinSegs(segs []seg, sep string) string {
parts := make([]string, len(segs))
for i, s := range segs {
parts[i] = s.text
}
return strings.Join(parts, sep)
}