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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| package overlay | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "strings" | ||
|
|
||
| "github.com/mattn/go-runewidth" | ||
| "github.com/muesli/ansi" | ||
| "github.com/muesli/reflow/truncate" | ||
| ) | ||
|
|
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| // Code borrowed and cut down from @mrusme and https://github.com/charmbracelet/lipgloss/pull/102 | ||
|
|
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| // Split a string into lines, additionally returning the size of the widest line. | ||
| func getLines(s string) (lines []string, widest int) { | ||
| lines = strings.Split(s, "\n") | ||
|
|
||
| for _, l := range lines { | ||
| w := ansi.PrintableRuneWidth(l) | ||
| if widest < w { | ||
| widest = w | ||
| } | ||
| } | ||
|
|
||
| return lines, widest | ||
| } | ||
|
|
||
| // PlaceOverlay places overlay on top of background. | ||
| func PlaceOverlay(x, y int, overlay, background string) string { | ||
| overlayLines, overlayWidth := getLines(overlay) | ||
| backgroundLines, backgroundWidth := getLines(background) | ||
| backgroundHeight := len(backgroundLines) | ||
| overlayHeight := len(overlayLines) | ||
|
|
||
| if overlayWidth >= backgroundWidth && overlayHeight >= backgroundHeight { | ||
| return overlay | ||
| } | ||
|
|
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| x = clamp(x, 0, backgroundWidth-overlayWidth) | ||
| y = clamp(y, 0, backgroundHeight-overlayHeight) | ||
|
|
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| var b strings.Builder | ||
| for i, backgroundLine := range backgroundLines { | ||
| if i > 0 { | ||
| b.WriteByte('\n') | ||
| } | ||
| if i < y || i >= y+overlayHeight { | ||
| b.WriteString(backgroundLine) | ||
| continue | ||
| } | ||
|
|
||
| pos := 0 | ||
| if x > 0 { | ||
| left := truncate.String(backgroundLine, uint(x)) | ||
| pos = ansi.PrintableRuneWidth(left) | ||
| b.WriteString(left) | ||
| if pos < x { | ||
| pos = x | ||
| } | ||
| } | ||
|
|
||
| overlayLine := overlayLines[i-y] | ||
| b.WriteString(overlayLine) | ||
| pos += ansi.PrintableRuneWidth(overlayLine) | ||
|
|
||
| right := cutLeft(backgroundLine, pos) | ||
| b.WriteString(right) | ||
| } | ||
|
|
||
| return b.String() | ||
| } | ||
|
|
||
| // cutLeft cuts printable characters from the left. | ||
| // This function is heavily based on muesli's ansi and truncate packages. | ||
| func cutLeft(s string, cutWidth int) string { | ||
| var ( | ||
| pos int | ||
| isAnsi bool | ||
| ab bytes.Buffer | ||
| b bytes.Buffer | ||
| ) | ||
|
|
||
| for _, c := range s { | ||
| var w int | ||
| if c == ansi.Marker || isAnsi { | ||
| isAnsi = true | ||
| ab.WriteRune(c) | ||
| if ansi.IsTerminator(c) { | ||
| isAnsi = false | ||
| if bytes.HasSuffix(ab.Bytes(), []byte("[0m")) { | ||
| ab.Reset() | ||
| } | ||
| } | ||
| } else { | ||
| w = runewidth.RuneWidth(c) | ||
| } | ||
|
|
||
| if pos >= cutWidth { | ||
| if b.Len() == 0 { | ||
| if ab.Len() > 0 { | ||
| b.Write(ab.Bytes()) | ||
| } | ||
| if pos-cutWidth > 1 { | ||
| b.WriteByte(' ') | ||
| continue | ||
| } | ||
| } | ||
| b.WriteRune(c) | ||
| } | ||
| pos += w | ||
| } | ||
|
|
||
| return b.String() | ||
| } | ||
|
|
||
| func clamp(v, lower, upper int) int { | ||
| return min(max(v, lower), upper) | ||
| } | ||
|
|
||
| func max(a, b int) int { | ||
| if a > b { | ||
| return a | ||
| } | ||
| return b | ||
| } | ||
|
|
||
| func min(a, b int) int { | ||
| if a < b { | ||
| return a | ||
| } | ||
| return b | ||
| } |
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