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fix(tui): rewrite word wrap as single-pass with backtracking

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Sviatoslav Abakumov 2026-01-22 23:36:17 +04:00
parent dd838d0fe0
commit 9090268b7d
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2 changed files with 127 additions and 137 deletions
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90
packages/tui/test/editor.test.ts
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@ -2,7 +2,7 @@ import assert from "node:assert";
import { describe, it } from "node:test";
import { stripVTControlCharacters } from "node:util";
import type { AutocompleteProvider } from "../src/autocomplete.js";
import { Editor } from "../src/components/editor.js";
import { Editor, wordWrapLine } from "../src/components/editor.js";
import { TUI } from "../src/tui.js";
import { visibleWidth } from "../src/utils.js";
import { defaultEditorTheme } from "./test-themes.js";
@ -698,6 +698,94 @@ describe("Editor component", () => {
const contentLine = stripVTControlCharacters(lines[1]!);
assert.ok(contentLine.includes("1234567890"), "Content should contain the word");
});
it("wraps word to next line when it ends exactly at terminal width", () => {
// "hello " (6) + "world" (5) = 11, but "world" is non-whitespace ending at width.
// Thus, wrap it to next line. The trailing space stays with "hello" on line 1
const chunks = wordWrapLine("hello world test", 11);
assert.strictEqual(chunks.length, 2);
assert.strictEqual(chunks[0]!.text, "hello ");
assert.strictEqual(chunks[1]!.text, "world test");
});
it("keeps whitespace at terminal width boundary on same line", () => {
// "hello world " is exactly 12 chars (including trailing space)
// The space at position 12 should stay on the first line
const chunks = wordWrapLine("hello world test", 12);
assert.strictEqual(chunks.length, 2);
assert.strictEqual(chunks[0]!.text, "hello world ");
assert.strictEqual(chunks[1]!.text, "test");
});
it("handles unbreakable word filling width exactly followed by space", () => {
const chunks = wordWrapLine("aaaaaaaaaaaa aaaa", 12);
assert.strictEqual(chunks.length, 2);
assert.strictEqual(chunks[0]!.text, "aaaaaaaaaaaa");
assert.strictEqual(chunks[1]!.text, " aaaa");
});
it("wraps word to next line when it fits width but not remaining space", () => {
const chunks = wordWrapLine(" aaaaaaaaaaaa", 12);
assert.strictEqual(chunks.length, 2);
assert.strictEqual(chunks[0]!.text, " ");
assert.strictEqual(chunks[1]!.text, "aaaaaaaaaaaa");
});
it("keeps word with multi-space and following word together when they fit", () => {
const chunks = wordWrapLine("Lorem ipsum dolor sit amet, consectetur", 30);
assert.strictEqual(chunks.length, 2);
assert.strictEqual(chunks[0]!.text, "Lorem ipsum dolor sit ");
assert.strictEqual(chunks[1]!.text, "amet, consectetur");
});
it("keeps word with multi-space and following word when they fill width exactly", () => {
const chunks = wordWrapLine("Lorem ipsum dolor sit amet, consectetur", 30);
assert.strictEqual(chunks.length, 2);
assert.strictEqual(chunks[0]!.text, "Lorem ipsum dolor sit ");
assert.strictEqual(chunks[1]!.text, "amet, consectetur");
});
it("splits when word plus multi-space plus word exceeds width", () => {
const chunks = wordWrapLine("Lorem ipsum dolor sit amet, consectetur", 30);
assert.strictEqual(chunks.length, 3);
assert.strictEqual(chunks[0]!.text, "Lorem ipsum dolor sit ");
assert.strictEqual(chunks[1]!.text, "amet, ");
assert.strictEqual(chunks[2]!.text, "consectetur");
});
it("breaks long whitespace at line boundary", () => {
const chunks = wordWrapLine("Lorem ipsum dolor sit amet, consectetur", 30);
assert.strictEqual(chunks.length, 3);
assert.strictEqual(chunks[0]!.text, "Lorem ipsum dolor sit ");
assert.strictEqual(chunks[1]!.text, "amet, ");
assert.strictEqual(chunks[2]!.text, "consectetur");
});
it("breaks long whitespace at line boundary 2", () => {
const chunks = wordWrapLine("Lorem ipsum dolor sit amet, consectetur", 30);
assert.strictEqual(chunks.length, 3);
assert.strictEqual(chunks[0]!.text, "Lorem ipsum dolor sit ");
assert.strictEqual(chunks[1]!.text, "amet, ");
assert.strictEqual(chunks[2]!.text, " consectetur");
});
it("breaks whitespace spanning full lines", () => {
const chunks = wordWrapLine("Lorem ipsum dolor sit amet, consectetur", 30);
assert.strictEqual(chunks.length, 3);
assert.strictEqual(chunks[0]!.text, "Lorem ipsum dolor sit ");
assert.strictEqual(chunks[1]!.text, "amet, ");
assert.strictEqual(chunks[2]!.text, " consectetur");
});
});
describe("Kill ring", () => {