Change help menus: Only display shortcuts used on the page

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

internal/ui/docs/model.go

@@ -5,8 +5,13 @@ import (
 
 	spilltea "github.com/anotherhadi/spilltea"
 
+	"charm.land/bubbles/v2/help"
+	"charm.land/bubbles/v2/key"
 	"charm.land/bubbles/v2/viewport"
 	tea "charm.land/bubbletea/v2"
+	"charm.land/lipgloss/v2"
+	"github.com/anotherhadi/spilltea/internal/keys"
+	"github.com/anotherhadi/spilltea/internal/style"
 )
 
 func readDoc(name string) string {
@@ -23,14 +28,51 @@ var contentMarkdown = strings.Join([]string{
 
 type Model struct {
 	viewport viewport.Model
+	help     help.Model
+
+	width  int
+	height int
 }
 
 func New() Model {
 	return Model{
 		viewport: viewport.New(),
+		help:     style.NewHelp(),
 	}
 }
 
 func (e Model) Init() tea.Cmd {
 	return nil
 }
+
+func (m *Model) SetSize(w, h int) {
+	m.width = w
+	m.height = h
+	m.help.SetWidth(w - 2)
+
+	statusH := strings.Count(m.renderStatusBar(), "\n") + 1
+	frameW := windowStyle().GetHorizontalFrameSize()
+	frameH := windowStyle().GetVerticalFrameSize()
+
+	m.viewport.SetWidth(w - frameW)
+	m.viewport.SetHeight(h - frameH - statusH)
+	m.renderMarkdown()
+}
+
+func (m *Model) renderStatusBar() string {
+	return lipgloss.NewStyle().Padding(0, 1).Render(m.help.View(docsKeyMap{width: m.width}))
+}
+
+type docsKeyMap struct{ width int }
+
+func (docsKeyMap) ShortHelp() []key.Binding {
+	g := keys.Keys.Global
+	return []key.Binding{g.Up, g.Down, g.Help}
+}
+
+func (m docsKeyMap) FullHelp() [][]key.Binding {
+	g := keys.Keys.Global
+	pageGlobals := []key.Binding{g.Up, g.Down, g.ScrollUp, g.ScrollDown}
+	all := append(pageGlobals, g.CommonBindings()...)
+	return keys.ChunkByWidth(all, m.width)
+}