Function renderCodeLine

internal/ui/diff.go:181–224

(dl DiffLine, filename string, styles Styles, t theme.Theme, width int)

}

func renderCodeLine(dl DiffLine, filename string, styles Styles, t theme.Theme, width int) string {
	oldNum := fmtLineNum(dl.OldNum)
	newNum := fmtLineNum(dl.NewNum)

	indicator := " "
	var bgColor string
	var numStyle lipgloss.Style
	var indStyle lipgloss.Style
	var bgStyle lipgloss.Style
	switch dl.Type {
	case LineAdded:
		indicator = "+"
		bgColor = t.AddedBg
		numStyle = styles.DiffLineNumAdded
		indStyle = styles.DiffAdded
		bgStyle = styles.DiffAddedBg
	case LineRemoved:
		indicator = "-"
		bgColor = t.RemovedBg
		numStyle = styles.DiffLineNumRemoved
		indStyle = styles.DiffRemoved
		bgStyle = styles.DiffRemovedBg
	default:
		numStyle = styles.DiffLineNum
		indStyle = styles.DiffContext
		bgStyle = lipgloss.NewStyle()
	}

	nums := numStyle.Render(oldNum + " " + newNum)

	// Syntax highlight the content
	highlighted := highlightLine(dl.Content, filename, bgColor)

	// Build: colored indicator + highlighted content + bg padding to fill width
	codeWidth := width - lineNumWidth*2 - 3 // nums + spaces
	prefix := indStyle.Render(indicator + " ")
	contentWidth := lipgloss.Width(prefix) + lipgloss.Width(highlighted)
	padding := ""
	if pad := codeWidth - contentWidth; pad > 0 {
		padding = bgStyle.Render(strings.Repeat(" ", pad))
	}

	return nums + " " + prefix + highlighted + padding
}

func fmtLineNum(n int) string {
	if n < 0 {