Initial Commit

internal/columns.go

@@ -0,0 +1,82 @@
+package internal
+
+import (
+	"fmt"
+
+	"github.com/charmbracelet/lipgloss"
+)
+
+// ────────────────────────────────
+// STYLES
+// ────────────────────────────────
+
+type Styles struct {
+	Title  lipgloss.Style
+	Box    lipgloss.Style
+	Active lipgloss.Style
+	Status lipgloss.Style
+}
+
+func NewStyles() Styles {
+	border := lipgloss.RoundedBorder()
+	return Styles{
+		Title:  lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("12")),
+		Box:    lipgloss.NewStyle().Border(border).Padding(0, 1).MarginRight(1),
+		Active: lipgloss.NewStyle().Border(border).BorderForeground(lipgloss.Color("10")).Padding(0, 1).MarginRight(1),
+		Status: lipgloss.NewStyle().Foreground(lipgloss.Color("8")).MarginTop(1),
+	}
+}
+
+// ────────────────────────────────
+// GENERIC LIST COLUMN
+// ────────────────────────────────
+
+type renderer[T any] func(T) string
+
+type ListColumn[T any] struct {
+	title    string
+	items    []T
+	selected int
+	width    int
+	render   renderer[T]
+}
+
+func NewListColumn[T any](title string, r renderer[T]) *ListColumn[T] {
+	return &ListColumn[T]{title: title, render: r, width: 30}
+}
+
+func (c *ListColumn[T]) SetItems(items []T) { c.items = items; c.selected = 0 }
+func (c *ListColumn[T]) SetTitle(title string) { c.title = title }
+func (c *ListColumn[T]) SetWidth(w int) { if w > 20 { c.width = w - 2 } }
+func (c *ListColumn[T]) CursorUp() { if c.selected > 0 { c.selected-- } }
+func (c *ListColumn[T]) CursorDown() { if c.selected < len(c.items)-1 { c.selected++ } }
+
+func (c *ListColumn[T]) Selected() (T, bool) {
+	var zero T
+	if len(c.items) == 0 {
+		return zero, false
+	}
+	return c.items[c.selected], true
+}
+
+func (c *ListColumn[T]) View(styles Styles, focused bool) string {
+	box := styles.Box
+	if focused {
+		box = styles.Active
+	}
+
+	head := styles.Title.Render(c.title)
+	content := ""
+	for i, it := range c.items {
+		cursor := "  "
+		if i == c.selected {
+			cursor = "▸ "
+		}
+		line := fmt.Sprintf("%s%s", cursor, c.render(it))
+		if len(line) > c.width && c.width > 3 {
+			line = line[:c.width-3] + "…"
+		}
+		content += line + "\n"
+	}
+	return box.Width(c.width + 2).Render(head + "\n" + content)
+}