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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,168 @@ | ||
| package components | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "strings" | ||
|
|
||
| charmansi "github.com/charmbracelet/x/exp/term/ansi" | ||
| "github.com/mattn/go-runewidth" | ||
| ansi "github.com/muesli/reflow/ansi" | ||
| "github.com/muesli/reflow/truncate" | ||
| "github.com/muesli/termenv" | ||
| ) | ||
|
|
||
| // whitespace is a whitespace renderer. | ||
| type whitespace struct { | ||
| style termenv.Style | ||
| chars string | ||
| } | ||
|
|
||
| type WhitespaceOption func(*whitespace) | ||
|
|
||
| // Render whitespaces. | ||
| func (w whitespace) render(width int) string { | ||
| if w.chars == "" { | ||
| w.chars = " " | ||
| } | ||
|
|
||
| r := []rune(w.chars) | ||
| j := 0 | ||
| b := strings.Builder{} | ||
|
|
||
| // Cycle through runes and print them into the whitespace. | ||
| for i := 0; i < width; { | ||
| b.WriteRune(r[j]) | ||
| j++ | ||
| if j >= len(r) { | ||
| j = 0 | ||
| } | ||
| i += charmansi.StringWidth(string(r[j])) | ||
| } | ||
|
|
||
| // Fill any extra gaps white spaces. This might be necessary if any runes | ||
| // are more than one cell wide, which could leave a one-rune gap. | ||
| short := width - charmansi.StringWidth(b.String()) | ||
| if short > 0 { | ||
| b.WriteString(strings.Repeat(" ", short)) | ||
| } | ||
|
|
||
| return w.style.Styled(b.String()) | ||
| } | ||
|
|
||
| // PlaceOverlay places fg on top of bg. | ||
| func PlaceOverlay(x, y int, fg, bg string, opts ...WhitespaceOption) string { | ||
| fgLines, fgWidth := getLines(fg) | ||
| bgLines, bgWidth := getLines(bg) | ||
| bgHeight := len(bgLines) | ||
| fgHeight := len(fgLines) | ||
|
|
||
| if fgWidth >= bgWidth && fgHeight >= bgHeight { | ||
| // FIXME: return fg or bg? | ||
| return fg | ||
| } | ||
| // TODO: allow placement outside of the bg box? | ||
| x = clamp(x, 0, bgWidth-fgWidth) | ||
| y = clamp(y, 0, bgHeight-fgHeight) | ||
|
|
||
| ws := &whitespace{} | ||
| for _, opt := range opts { | ||
| opt(ws) | ||
| } | ||
|
|
||
| var b strings.Builder | ||
| for i, bgLine := range bgLines { | ||
| if i > 0 { | ||
| b.WriteByte('\n') | ||
| } | ||
| if i < y || i >= y+fgHeight { | ||
| b.WriteString(bgLine) | ||
| continue | ||
| } | ||
|
|
||
| pos := 0 | ||
| if x > 0 { | ||
| left := truncate.String(bgLine, uint(x)) | ||
| pos = ansi.PrintableRuneWidth(left) | ||
| b.WriteString(left) | ||
| if pos < x { | ||
| b.WriteString(ws.render(x - pos)) | ||
| pos = x | ||
| } | ||
| } | ||
|
|
||
| fgLine := fgLines[i-y] | ||
| b.WriteString(fgLine) | ||
| pos += ansi.PrintableRuneWidth(fgLine) | ||
|
|
||
| right := cutLeft(bgLine, pos) | ||
| bgWidth := ansi.PrintableRuneWidth(bgLine) | ||
| rightWidth := ansi.PrintableRuneWidth(right) | ||
| if rightWidth <= bgWidth-pos { | ||
| b.WriteString(ws.render(bgWidth - rightWidth - 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) | ||
| } | ||
|
|
||
| // 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 := charmansi.StringWidth(l) | ||
| if widest < w { | ||
| widest = w | ||
| } | ||
| } | ||
|
|
||
| return lines, widest | ||
| } |
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