Fix chat redraw and input history

uiterm/textbox_test.go

@@ -0,0 +1,93 @@
+package uiterm
+
+import "testing"
+
+func TestTextboxHistoryNavigatesSubmittedText(t *testing.T) {
+	t.Parallel()
+
+	textbox := Textbox{}
+	textbox.addHistory("first")
+	textbox.addHistory("second")
+
+	if !textbox.previousHistory() {
+		t.Fatal("expected previous history item")
+	}
+	if textbox.Text != "second" {
+		t.Fatalf("expected second history item, got %q", textbox.Text)
+	}
+
+	if !textbox.previousHistory() {
+		t.Fatal("expected older history item")
+	}
+	if textbox.Text != "first" {
+		t.Fatalf("expected first history item, got %q", textbox.Text)
+	}
+
+	if !textbox.nextHistory() {
+		t.Fatal("expected newer history item")
+	}
+	if textbox.Text != "second" {
+		t.Fatalf("expected second history item after next, got %q", textbox.Text)
+	}
+}
+
+func TestTextboxHistoryNavigatesAltArrowKeys(t *testing.T) {
+	t.Parallel()
+
+	textbox := Textbox{}
+	textbox.addHistory("first")
+	textbox.addHistory("second")
+
+	if redraw := textbox.handleHistoryKey(KeyAltArrowUp); !redraw {
+		t.Fatal("expected alt-up to recall history")
+	}
+	if textbox.Text != "second" {
+		t.Fatalf("expected second history item, got %q", textbox.Text)
+	}
+
+	if redraw := textbox.handleHistoryKey(KeyAltArrowDown); !redraw {
+		t.Fatal("expected alt-down to move forward through history")
+	}
+	if textbox.Text != "" {
+		t.Fatalf("expected alt-down to restore empty draft, got %q", textbox.Text)
+	}
+}
+
+func TestTextboxHistoryRestoresDraft(t *testing.T) {
+	t.Parallel()
+
+	textbox := Textbox{Text: "draft"}
+	textbox.addHistory("previous")
+	textbox.setText("draft")
+
+	if !textbox.previousHistory() {
+		t.Fatal("expected previous history item")
+	}
+	if textbox.Text != "previous" {
+		t.Fatalf("expected previous history item, got %q", textbox.Text)
+	}
+
+	if !textbox.nextHistory() {
+		t.Fatal("expected history next to restore draft")
+	}
+	if textbox.Text != "draft" {
+		t.Fatalf("expected draft to be restored, got %q", textbox.Text)
+	}
+}
+
+func TestTextboxHistorySkipsBlankAndConsecutiveDuplicateEntries(t *testing.T) {
+	t.Parallel()
+
+	textbox := Textbox{}
+	textbox.addHistory("")
+	textbox.addHistory("   ")
+	textbox.addHistory("repeat")
+	textbox.addHistory("repeat")
+
+	if len(textbox.history) != 1 {
+		t.Fatalf("expected one history item, got %d", len(textbox.history))
+	}
+	if textbox.history[0] != "repeat" {
+		t.Fatalf("expected repeat history item, got %q", textbox.history[0])
+	}
+}