Hello world

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/ui/panes/highlight.go

@@ -0,0 +1,53 @@
+package panes
+
+import (
+	"image/color"
+	"regexp"
+	"strings"
+
+	"charm.land/lipgloss/v2"
+	"github.com/charmbracelet/x/ansi"
+)
+
+// sgr matches SGR escape sequences.
+var sgr = regexp.MustCompile("\x1b\\[([0-9;:]*)m")
+
+// Highlight draws a cursor row: line, padded to width, on style's
+// background, keeping the colours line already has (a provider's colour,
+// a dimmed note), like LazyVim's and lazygit's selected lines; bold
+// carries over too. A reverse style is applied to the plain text instead,
+// since reversing coloured text would scramble it.
+func Highlight(line string, style lipgloss.Style, width int) string {
+	pad := strings.Repeat(" ", max(0, width-ansi.StringWidth(line)))
+	if style.GetReverse() {
+		return style.Render(ansi.Strip(line) + pad)
+	}
+	var s ansi.Style
+	if bg := style.GetBackground(); !isNoColor(bg) { // never nil: NoColor when unset
+		s = s.BackgroundColor(bg)
+	}
+	if style.GetBold() {
+		s = s.Bold()
+	}
+	if len(s) == 0 {
+		return line + pad
+	}
+	on := s.String()
+	// Every reset in line (a bare reset, one starting with 0, or a
+	// background reset) would end the highlight: put it back after each.
+	line = sgr.ReplaceAllStringFunc(line, func(seq string) string {
+		params := sgr.FindStringSubmatch(seq)[1]
+		for _, p := range strings.Split(params, ";") {
+			if p == "" || p == "0" || p == "49" {
+				return seq + on
+			}
+		}
+		return seq
+	})
+	return on + line + pad + ansi.ResetStyle
+}
+
+func isNoColor(c color.Color) bool {
+	_, ok := c.(lipgloss.NoColor)
+	return ok
+}