textui/base.test.ts

import { BufferDrawing, BufferLocation, CharBuffer } from "./base.ts";
import { describe, expect, it } from "./deps.testing.ts";

describe(CharBuffer, () => {
  it("initializes empty, sets and gets characters", () => {
    const buffer = new CharBuffer({ w: 3, h: 2 });
    expect(buffer.toString()).toEqual("      ");
    buffer.set({ x: 2, y: 0 }, { ch: "x", fg: 1, bg: 4 });
    buffer.set({ x: 1, y: 1 }, { ch: "y", fg: 2, bg: 5 });
    expect(buffer.toString()).toEqual("  x y ");
    expect(buffer.get({ x: 0, y: 0 })).toEqual({ ch: " ", fg: 0, bg: 0 });
    expect(buffer.get({ x: 1, y: 1 })).toEqual({ ch: "y", fg: 2, bg: 5 });
  });

  it("keeps track of dirty lines", async () => {
    const buffer = new CharBuffer({ w: 16, h: 3 });
    expect(buffer.isDirty({ x: 0, y: 0 })).toBe(true);
    buffer.setDirty(false);
    expect(buffer.isDirty({ x: 0, y: 0 })).toBe(false);
    buffer.set({ x: 0, y: 0 }, { ch: "x", bg: 0, fg: 0 });
    expect(buffer.isDirty({ x: 0, y: 0 })).toBe(true);
    expect(buffer.isDirty({ x: 1, y: 0 })).toBe(true);
    expect(buffer.isDirty({ x: 2, y: 0 })).toBe(false);
    expect(buffer.isDirty({ x: 0, y: 1 })).toBe(false);
    let calls: BufferLocation[] = [];
    await buffer.forEachDirty(async (at) => {
      calls.push(at);
    });
    expect(calls).toEqual([{ x: 0, y: 0 }, { x: 1, y: 0 }]);
    calls = [];
    await buffer.forEachDirty(async (at) => {
      calls.push(at);
    });
    expect(calls).toEqual([]);
  });
});

describe(BufferDrawing, () => {
  it("draws text", () => {
    const buffer = new CharBuffer({ w: 4, h: 2 });
    const drawing = new BufferDrawing(buffer, []);
    drawing.text("testing", { x: -1, y: 0 });
    drawing.text("so", { x: 1, y: 1 });
    expect(buffer.toString()).toEqual("esti so ");
  });
});