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Construct one combined true-color ANSI sequence for foreground and background colors

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This commit is contained in:
Christian Muehlhaeuser
2019-12-05 20:46:05 +01:00
parent 78e36a02d0
commit 7eec968514
1 changed files with 43 additions and 23 deletions
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baseelement.go
+43 -23
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@@ -31,17 +31,36 @@ func color(c *string) (uint8, error) {
return uint8(i), err
}
func colorSeq(c *string) (string, error) {
if c == nil || len(*c) == 0 {
return "", errors.New("Invalid color")
func colorSeq(fg *string, bg *string) (string, error) {
fc := ""
bc := ""
if fg != nil {
fc = *fg
}
if bg != nil {
bc = *bg
}
col, err := colorful.Hex(*c)
if err != nil {
return "", err
fs := ""
bs := ""
f, err := colorful.Hex(fc)
if err == nil {
fs = fmt.Sprintf("38;2;%d;%d;%d", uint8(f.R*255), uint8(f.G*255), uint8(f.B*255))
}
b, err := colorful.Hex(bc)
if err == nil {
bs = fmt.Sprintf("48;2;%d;%d;%d", uint8(b.R*255), uint8(b.G*255), uint8(b.B*255))
}
return fmt.Sprintf("%d;%d;%dm", uint8(col.R*255), uint8(col.G*255), uint8(col.B*255)), nil
if len(fs) > 0 || len(bs) > 0 {
seq := "\x1b[" + fs
if len(fs) > 0 {
seq += ";"
}
return seq + bs + "m", nil
}
return "", errors.New("Invalid color")
}
func renderText(w io.Writer, rules ElementStyle, s string) {
@@ -49,30 +68,31 @@ func renderText(w io.Writer, rules ElementStyle, s string) {
return
}
truecolor := os.Getenv("COLORTERM") == "truecolor"
// FIXME: ugly true-color ANSI support hack
if os.Getenv("COLORTERM") == "truecolor" {
bg, err := colorSeq(rules.BackgroundColor)
if truecolor {
seq, err := colorSeq(rules.Color, rules.BackgroundColor)
if err == nil {
s = "\x1b[48;2;" + bg + s
}
fg, err := colorSeq(rules.Color)
if err == nil {
s = "\x1b[38;2;" + fg + s
s = seq + s
} else {
truecolor = false
}
}
out := aurora.Reset(s)
if rules.Color != nil {
i, err := color(rules.Color)
if err == nil {
out = out.Index(i)
if !truecolor {
if rules.Color != nil {
i, err := color(rules.Color)
if err == nil {
out = out.Index(i)
}
}
}
if rules.BackgroundColor != nil {
i, err := color(rules.BackgroundColor)
if err == nil {
out = out.BgIndex(i)
if rules.BackgroundColor != nil {
i, err := color(rules.BackgroundColor)
if err == nil {
out = out.BgIndex(i)
}
}
}
if rules.Underline != nil && *rules.Underline {