fix: editor whitespaces

text_editor_test.go

@@ -308,6 +308,65 @@ func TestEditorKeepsWrappedRowsAndContextRailsVisible(t *testing.T) {
 	}
 }
 
+func TestEditorWordWrapHidesSoftWrapSpacesWithoutChangingText(t *testing.T) {
+	const value = "abcdefghij hello"
+	visual := editorVisualLines(value, 10)
+	if len(visual) != 2 || visual[0].text != "abcdefghij" || visual[1].text != "hello" {
+		t.Fatalf("word-wrapped lines = %#v", visual)
+	}
+	if visual[1].start != 10 || visual[1].displayStart != 11 {
+		t.Fatalf("wrapped separator offsets = %#v", visual[1])
+	}
+
+	editor := newTextEditor(value, true)
+	editor.Cursor = len([]rune(value))
+	rendered := renderTextEditor(editor, 10, false)
+	if got := ansi.Strip(rendered[1].text); got != "hello" {
+		t.Fatalf("wrapped row begins with separator space: %q", got)
+	}
+	if editor.Text != value {
+		t.Fatalf("word wrapping changed stored text: %q", editor.Text)
+	}
+
+	visual = editorVisualLines("hello world", 10)
+	if len(visual) != 2 || visual[0].text != "hello" || visual[1].text != "world" {
+		t.Fatalf("overflowing word was split instead of moved: %#v", visual)
+	}
+}
+
+func TestEditorBoundarySpaceCreatesEmptyVisualRow(t *testing.T) {
+	const value = "abcdefghij "
+	visual := editorVisualLines(value, 10)
+	if len(visual) != 2 || visual[0].text != "abcdefghij" || visual[1].text != "" {
+		t.Fatalf("boundary-space lines = %#v", visual)
+	}
+	if visual[1].start != 10 || visual[1].displayStart != 11 || visual[1].end != 11 {
+		t.Fatalf("boundary-space offsets = %#v", visual[1])
+	}
+	editor := newTextEditor(value, true)
+	editor.Cursor = len([]rune(value))
+	if line, column := editorCursorVisualPosition(editor, 10); line != 1 || column != 0 {
+		t.Fatalf("boundary-space cursor = row %d column %d, want row 1 column 0", line, column)
+	}
+}
+
+func TestEditorWordWrapHardWrapsWordsWiderThanViewport(t *testing.T) {
+	const value = "hi abcdefghijklmnopqrstuv"
+	visual := editorVisualLines(value, 10)
+	want := []string{"hi", "abcdefghij", "klmnopqrst", "uv"}
+	if len(visual) != len(want) {
+		t.Fatalf("long-word rows = %#v, want %q", visual, want)
+	}
+	for index, line := range visual {
+		if line.text != want[index] {
+			t.Fatalf("long-word row %d = %q, want %q", index, line.text, want[index])
+		}
+		if ansi.StringWidth(line.text) > 10 {
+			t.Fatalf("long-word row %d exceeds viewport: %q", index, line.text)
+		}
+	}
+}
+
 func TestVimEditorTreatsSoftWrapsAsVisualLinesWithoutChangingText(t *testing.T) {
 	const value = "abcdefghijklmnopqrstuv"
 	editor := newTextEditor(value, true)