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Extracted from charmbracelet/gum#789 , this allows to style ranges of a given string without breaking its current styles. The resulting ansi sequences aren't that beautiful (as there might be many styles+reset with nothing in them), but it works. We can optimize this later I think.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| package lipgloss | ||
|
|
||
| import ( | ||
| "strings" | ||
|
|
||
| "github.com/charmbracelet/x/ansi" | ||
| ) | ||
|
|
||
| // StyleRanges allows to, given a string, style ranges of it differently. | ||
| // The function will take into account existing styles. | ||
| func StyleRanges(s string, ranges []Range) string { | ||
| if len(ranges) == 0 { | ||
| return s | ||
| } | ||
|
|
||
| var buf strings.Builder | ||
| lastIdx := 0 | ||
| stripped := ansi.Strip(s) | ||
|
|
||
| // Use Truncate and TruncateLeft to style match.MatchedIndexes without | ||
| // losing the original option style: | ||
| for _, rng := range ranges { | ||
| // Add the text before this match | ||
| if rng.Start > lastIdx { | ||
| buf.WriteString(ansi.Cut(s, lastIdx, rng.Start)) | ||
| } | ||
| if l := len(stripped); rng.End >= l { | ||
| rng.End = l - 1 | ||
| } | ||
| // Add the matched range with its highlight | ||
| buf.WriteString(rng.Style.Render(stripped[rng.Start : rng.End+1])) | ||
| lastIdx = rng.End + 1 | ||
| } | ||
|
|
||
| // Add any remaining text after the last match | ||
| if lastIdx < ansi.StringWidth(s) { | ||
| buf.WriteString(ansi.TruncateLeft(s, lastIdx, "")) | ||
| } | ||
|
|
||
| return buf.String() | ||
| } | ||
|
|
||
| // NewRange returns a range that can be used with [StyleRanges]. | ||
| func NewRange(start, end int, style Style) Range { | ||
| return Range{start, end, style} | ||
| } | ||
|
|
||
| // Range to be used with [StyleRanges]. | ||
| type Range struct { | ||
| Start, End int | ||
| Style Style | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| package lipgloss | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
||
| "github.com/muesli/termenv" | ||
| ) | ||
|
|
||
| func TestStyleRanges(t *testing.T) { | ||
| tests := []struct { | ||
| name string | ||
| input string | ||
| ranges []Range | ||
| expected string | ||
| }{ | ||
| { | ||
| name: "empty ranges", | ||
| input: "hello world", | ||
| ranges: []Range{}, | ||
| expected: "hello world", | ||
| }, | ||
| { | ||
| name: "single range in middle", | ||
| input: "hello world", | ||
| ranges: []Range{ | ||
| NewRange(6, 10, NewStyle().Bold(true)), | ||
| }, | ||
| expected: "hello \x1b[1mworld\x1b[0m", | ||
| }, | ||
| { | ||
| name: "multiple ranges", | ||
| input: "hello world", | ||
| ranges: []Range{ | ||
| NewRange(0, 4, NewStyle().Bold(true)), | ||
| NewRange(6, 10, NewStyle().Italic(true)), | ||
| }, | ||
| expected: "\x1b[1mhello\x1b[0m \x1b[3mworld\x1b[0m", | ||
| }, | ||
| { | ||
| name: "overlapping with existing ANSI", | ||
| input: "hello \x1b[32mworld\x1b[0m", | ||
| ranges: []Range{ | ||
| NewRange(0, 4, NewStyle().Bold(true)), | ||
| }, | ||
| expected: "\x1b[1mhello\x1b[0m \x1b[32mworld\x1b[0m", | ||
| }, | ||
| { | ||
| name: "style at start", | ||
| input: "hello world", | ||
| ranges: []Range{ | ||
| NewRange(0, 4, NewStyle().Bold(true)), | ||
| }, | ||
| expected: "\x1b[1mhello\x1b[0m world", | ||
| }, | ||
| { | ||
| name: "style at end", | ||
| input: "hello world", | ||
| ranges: []Range{ | ||
| NewRange(6, 10, NewStyle().Bold(true)), | ||
| }, | ||
| expected: "hello \x1b[1mworld\x1b[0m", | ||
| }, | ||
| { | ||
| name: "multiple styles with gap", | ||
| input: "hello beautiful world", | ||
| ranges: []Range{ | ||
| NewRange(0, 4, NewStyle().Bold(true)), | ||
| NewRange(16, 23, NewStyle().Italic(true)), | ||
| }, | ||
| expected: "\x1b[1mhello\x1b[0m beautiful \x1b[3mworld\x1b[0m", | ||
| }, | ||
| { | ||
| name: "adjacent ranges", | ||
| input: "hello world", | ||
| ranges: []Range{ | ||
| NewRange(0, 4, NewStyle().Bold(true)), | ||
| NewRange(6, 10, NewStyle().Italic(true)), | ||
| }, | ||
| expected: "\x1b[1mhello\x1b[0m \x1b[3mworld\x1b[0m", | ||
| }, | ||
| } | ||
|
|
||
| for _, tt := range tests { | ||
| renderer.SetColorProfile(termenv.ANSI) | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| result := StyleRanges(tt.input, tt.ranges) | ||
| if result != tt.expected { | ||
| t.Errorf("StyleRanges() = %q, want %q", result, tt.expected) | ||
| } | ||
| }) | ||
| } | ||
| } |