feat: add a Styler interface for styling bubbles

This change introduces a Styler interface that allows users to define
custom styles for bubbles. The interface is implemented by the StylerFunc
type, which is a function type that takes a boolean argument and returns
a value of any type.

This allows a user to define a custom StylerFunc that returns a custom
style for a bubble based on the background color of the terminal.

list/defaultitem.go

@@ -94,16 +94,14 @@ type DefaultDelegate struct {
 }
 
 // NewDefaultDelegate creates a new delegate with default styles.
-func NewDefaultDelegate() DefaultDelegate {
+func NewDefaultDelegate(isDark bool) DefaultDelegate {
 	const defaultHeight = 2
 	const defaultSpacing = 1
 	return DefaultDelegate{
 		ShowDescription: true,
-		// XXX: Let the user choose between light and dark colors. We've
-		// temporarily hardcoded the dark colors here.
-		Styles:  NewDefaultItemStyles(true),
-		height:  defaultHeight,
-		spacing: defaultSpacing,
+		Styles:          NewDefaultItemStyles(isDark),
+		height:          defaultHeight,
+		spacing:         defaultSpacing,
 	}
 }
 

list/list.go

@@ -196,10 +196,8 @@ type Model struct {
 }
 
 // New returns a new model with sensible defaults.
-func New(items []Item, delegate ItemDelegate, width, height int) Model {
-	// XXX: Let the user choose between light and dark colors. We've
-	// temporarily hardcoded the dark colors here.
-	styles := DefaultStyles(true)
+func New(items []Item, delegate ItemDelegate, width, height int, isDark bool) Model {
+	styles := DefaultStyles(isDark)
 
 	sp := spinner.New()
 	sp.Spinner = spinner.Line
@@ -239,7 +237,7 @@ func New(items []Item, delegate ItemDelegate, width, height int) Model {
 		items:     items,
 		Paginator: p,
 		spinner:   sp,
-		Help:      help.New(),
+		Help:      help.New(isDark),
 	}
 
 	m.updatePagination()

list/list_test.go

@@ -30,7 +30,7 @@ func (d itemDelegate) Render(w io.Writer, m Model, index int, listItem Item) {
 }
 
 func TestStatusBarItemName(t *testing.T) {
-	list := New([]Item{item("foo"), item("bar")}, itemDelegate{}, 10, 10)
+	list := New([]Item{item("foo"), item("bar")}, itemDelegate{}, 10, 10, true)
 	expected := "2 items"
 	if !strings.Contains(list.statusView(), expected) {
 		t.Fatalf("Error: expected view to contain %s", expected)
@@ -44,7 +44,7 @@ func TestStatusBarItemName(t *testing.T) {
 }
 
 func TestStatusBarWithoutItems(t *testing.T) {
-	list := New([]Item{}, itemDelegate{}, 10, 10)
+	list := New([]Item{}, itemDelegate{}, 10, 10, true)
 
 	expected := "No items"
 	if !strings.Contains(list.statusView(), expected) {
@@ -53,7 +53,7 @@ func TestStatusBarWithoutItems(t *testing.T) {
 }
 
 func TestCustomStatusBarItemName(t *testing.T) {
-	list := New([]Item{item("foo"), item("bar")}, itemDelegate{}, 10, 10)
+	list := New([]Item{item("foo"), item("bar")}, itemDelegate{}, 10, 10, true)
 	list.SetStatusBarItemName("connection", "connections")
 
 	expected := "2 connections"
@@ -77,7 +77,7 @@ func TestCustomStatusBarItemName(t *testing.T) {
 func TestSetFilterText(t *testing.T) {
 	tc := []Item{item("foo"), item("bar"), item("baz")}
 
-	list := New(tc, itemDelegate{}, 10, 10)
+	list := New(tc, itemDelegate{}, 10, 10, true)
 	list.SetFilterText("ba")
 
 	list.SetFilterState(Unfiltered)
@@ -102,7 +102,7 @@ func TestSetFilterText(t *testing.T) {
 func TestSetFilterState(t *testing.T) {
 	tc := []Item{item("foo"), item("bar"), item("baz")}
 
-	list := New(tc, itemDelegate{}, 10, 10)
+	list := New(tc, itemDelegate{}, 10, 10, true)
 	list.SetFilterText("ba")
 
 	list.SetFilterState(Unfiltered)