Initial commit

Signed-off-by: Ilan Bigio <ilan@openai.com>

codex-cli/tests/text-buffer-word.test.ts

@@ -0,0 +1,115 @@
+import TextBuffer from "../src/lib/text-buffer.js";
+import { describe, test, expect } from "vitest";
+
+describe("TextBuffer – word‑wise navigation & deletion", () => {
+  test("wordRight moves to end‑of‑line when no further boundary", () => {
+    const tb = new TextBuffer("hello");
+
+    // Move the caret inside the word (index 3)
+    tb.move("right");
+    tb.move("right");
+    tb.move("right");
+
+    tb.move("wordRight");
+
+    const [, col] = tb.getCursor();
+    expect(col).toBe(5); // end of the word / line
+  });
+
+  test("Ctrl+Backspace on raw byte deletes previous word", () => {
+    const tb = new TextBuffer("hello world");
+    const vp = { height: 10, width: 80 } as const;
+
+    // Place caret at end
+    tb.move("end");
+
+    // Simulate terminal sending DEL (0x7f) byte with ctrl modifier – Ink
+    // usually does *not* set `key.backspace` in this path.
+    tb.handleInput("\x7f", { ctrl: true }, vp);
+
+    expect(tb.getText()).toBe("hello ");
+  });
+
+  test("Option/Alt+Backspace deletes previous word", () => {
+    const tb = new TextBuffer("foo bar baz");
+    const vp = { height: 10, width: 80 } as const;
+
+    // caret at end
+    tb.move("end");
+
+    // Simulate Option+Backspace (alt): Ink sets key.backspace = true, key.alt = true (no raw byte)
+    tb.handleInput(undefined, { backspace: true, alt: true }, vp);
+
+    expect(tb.getText()).toBe("foo bar ");
+  });
+
+  test("Option/Alt+Delete deletes next word", () => {
+    const tb = new TextBuffer("foo bar baz");
+    const vp = { height: 10, width: 80 } as const;
+
+    // Move caret between first and second word (after space)
+    tb.move("wordRight"); // after foo
+    tb.move("right"); // skip space -> start of bar
+
+    // Option+Delete
+    tb.handleInput(undefined, { delete: true, alt: true }, vp);
+
+    expect(tb.getText()).toBe("foo  baz"); // note double space removed later maybe
+  });
+
+  test("wordLeft eventually reaches column 0", () => {
+    const tb = new TextBuffer("hello world");
+
+    // Move to end of line first
+    tb.move("end");
+
+    // two wordLefts should land at start of line
+    tb.move("wordLeft");
+    tb.move("wordLeft");
+
+    const [, col] = tb.getCursor();
+    expect(col).toBe(0);
+  });
+
+  test("wordRight jumps over a delimiter into the next word", () => {
+    const tb = new TextBuffer("hello world");
+
+    tb.move("wordRight"); // from start – should land after "hello" (between space & w)
+    let [, col] = tb.getCursor();
+    expect(col).toBe(5);
+
+    // Next wordRight should move to end of line (after "world")
+    tb.move("wordRight");
+    [, col] = tb.getCursor();
+    expect(col).toBe(11);
+  });
+
+  test("deleteWordLeft removes the previous word and positions the caret correctly", () => {
+    const tb = new TextBuffer("hello world");
+
+    // Place caret at end of line
+    tb.move("end");
+
+    // Act
+    tb.deleteWordLeft();
+
+    expect(tb.getText()).toBe("hello ");
+    const [, col] = tb.getCursor();
+    expect(col).toBe(6); // after the space
+  });
+
+  test("deleteWordRight removes the following word", () => {
+    const tb = new TextBuffer("hello world");
+
+    // Move caret to start of "world"
+    tb.move("wordRight"); // caret after "hello"
+    tb.move("right"); // skip the space, now at index 6 (start of world)
+
+    // Act
+    tb.deleteWordRight();
+
+    expect(tb.getText()).toBe("hello ");
+    const [, col] = tb.getCursor();
+    expect(col).toBe(6);
+  });
+});