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refactor: consolidate functions into single file
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| package overlay | ||
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| import ( | ||
| "strconv" | ||
| "strings" | ||
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| "github.com/charmbracelet/lipgloss" | ||
| "github.com/charmbracelet/x/ansi" | ||
| ) | ||
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| // composite merges and flattens the background and foreground views into a single view. | ||
| // This implementation is based off of the one used by Superfile - | ||
| // https://github.com/yorukot/superfile/blob/main/src/pkg/string_function/overplace.go | ||
| func composite(fg, bg string, xPos, yPos Position, xOff, yOff int) string { | ||
| fgWidth, fgHeight := lipgloss.Size(fg) | ||
| bgWidth, bgHeight := lipgloss.Size(bg) | ||
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| if fgWidth >= bgWidth && fgHeight >= bgHeight { | ||
| return fg | ||
| } | ||
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| x, y := offsets(fg, bg, xPos, yPos, xOff, yOff) | ||
| x = clamp(x, 0, bgWidth-fgWidth) | ||
| y = clamp(y, 0, bgHeight-fgHeight) | ||
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| fgLines := lines(fg) | ||
| bgLines := lines(bg) | ||
| var sb strings.Builder | ||
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| for i, bgLine := range bgLines { | ||
| if i > 0 { | ||
| sb.WriteByte('\n') | ||
| } | ||
| if i < y || i >= y+fgHeight { | ||
| sb.WriteString(bgLine) | ||
| continue | ||
| } | ||
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| pos := 0 | ||
| if x > 0 { | ||
| left := ansi.Truncate(bgLine, x, "") | ||
| pos = ansi.StringWidth(left) | ||
| sb.WriteString(left) | ||
| if pos < x { | ||
| sb.WriteString(whitespace(x - pos)) | ||
| pos = x | ||
| } | ||
| } | ||
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| fgLine := fgLines[i-y] | ||
| sb.WriteString(fgLine) | ||
| pos += ansi.StringWidth(fgLine) | ||
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| right := ansi.TruncateLeft(bgLine, pos, "") | ||
| bgWidth := ansi.StringWidth(bgLine) | ||
| rightWidth := ansi.StringWidth(right) | ||
| if rightWidth <= bgWidth-pos { | ||
| sb.WriteString(whitespace(bgWidth - rightWidth - pos)) | ||
| } | ||
| sb.WriteString(right) | ||
| } | ||
| return sb.String() | ||
| } | ||
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| // offsets calculates the actual vertical and horizontal offsets used to position the foreground | ||
| // tea.Model relative to the background tea.Model. | ||
| func offsets(fg, bg string, xPos, yPos Position, xOff, yOff int) (int, int) { | ||
| var x, y int | ||
| switch xPos { | ||
| case Center: | ||
| halfBackgroundWidth := (lipgloss.Width(bg) + 1) / 2 | ||
| halfForegroundWidth := (lipgloss.Width(fg) + 1) / 2 | ||
| x = halfBackgroundWidth - halfForegroundWidth | ||
| case Right: | ||
| x = lipgloss.Width(bg) - lipgloss.Width(fg) | ||
| } | ||
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| switch yPos { | ||
| case Center: | ||
| halfBackgroundHeight := (lipgloss.Height(bg) + 1) / 2 | ||
| halfForegroundHeight := (lipgloss.Height(fg) + 1) / 2 | ||
| y = halfBackgroundHeight - halfForegroundHeight | ||
| case Bottom: | ||
| y = lipgloss.Height(bg) - lipgloss.Height(fg) | ||
| } | ||
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| debug( | ||
| "X position: "+strconv.Itoa(int(xPos)), | ||
| "Y position: "+strconv.Itoa(int(yPos)), | ||
| "X offset: "+strconv.Itoa(x+xOff), | ||
| "Y offset: "+strconv.Itoa(y+yOff), | ||
| "Background width: "+strconv.Itoa(lipgloss.Width(bg)), | ||
| "Foreground width: "+strconv.Itoa(lipgloss.Width(fg)), | ||
| "Background height: "+strconv.Itoa(lipgloss.Height(bg)), | ||
| "Foreground height: "+strconv.Itoa(lipgloss.Height(fg)), | ||
| ) | ||
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| return x + xOff, y + yOff | ||
| } | ||
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| // clamp calculates the lowest possible number between the given boundaries. | ||
| func clamp(v, lower, upper int) int { | ||
| return min(max(v, lower), upper) | ||
| } | ||
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| // lines normalises any non standard new lines within a string, and then splits and returns a slice | ||
| // of strings split on the new lines. | ||
| func lines(s string) []string { | ||
| s = strings.ReplaceAll(s, "\r\n", "\n") | ||
| return strings.Split(s, "\n") | ||
| } | ||
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| // whitescpace returns a string of whitespace characters of the requested length. | ||
| func whitespace(length int) string { | ||
| return strings.Repeat(" ", length) | ||
| } |
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