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TypeScript
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273import assert from "node:assert/strict"import test from "node:test"import stringWidth from "string-width"import type { Rows } from "./row-index.js"import { highlightSelection, selectedText, type Selection } from "./selection.js"
const range = (anchor: [number, number], head: [number, number]): Selection => ({ anchor: { row: anchor[0], column: anchor[1] }, head: { row: head[0], column: head[1] },})const rows = (lines: string[]): Rows => ({ length: lines.length, slice: (start, end) => lines.slice(start, end) })
test("copies forward, reverse, and multiline terminal-cell ranges", () => { const source = rows(["abcd", "efgh", "ijkl"]) assert.equal(selectedText(source, range([0, 0], [0, 3])), "abc") assert.equal(selectedText(source, range([1, 2], [0, 1])), "bcd\nef") assert.equal(selectedText(source, range([0, 2], [2, 1])), "cd\nefgh\ni") assert.equal(selectedText(source, range([1, 2], [1, 2])), "")})
test("clips points to the available rows and cells", () => { const source = rows(["abc", "de"]) assert.equal(selectedText(source, range([-20, -5], [20, 99])), "abc\nde") assert.equal(selectedText(source, range([0, 99], [1, -4])), "\n") assert.equal(selectedText(rows([]), range([0, 0], [1, 1])), "")})
test("cell intersections copy whole wide and combining graphemes", () => { const source = rows(["a界b", "e\u0301x", "👩💻!"]) assert.equal(selectedText(source, range([0, 2], [0, 3])), "界") assert.equal(selectedText(source, range([1, 0], [1, 1])), "e\u0301") assert.equal(selectedText(source, range([2, 1], [2, 2])), "👩💻")})
test("copied text omits terminal escape sequences", () => { const source = rows(["\u001b[31mred\u001b[0m plain", "\u001b]8;;https://example.test\u0007link\u001b]8;;\u0007"]) assert.equal(selectedText(source, range([0, 0], [0, 3])), "red") assert.equal(selectedText(source, range([1, 0], [1, 4])), "link")})
test("copying asks a row source only for the selected span", () => { const calls: [number, number][] = [] const source: Rows = { length: 10_000, slice(start, end) { calls.push([start, end]) return Array.from({ length: end - start }, (_, index) => `row ${start + index}`) }, } assert.equal(selectedText(source, range([402, 3], [400, 4])), "400\nrow 401\nrow") assert.deepEqual(calls, [[400, 403]])})
test("highlighting preserves untouched rows and cell width", () => { const lines = ["outside", "a界b", "e\u0301x", "after"] const highlighted = highlightSelection(lines, 7, range([8, 2], [9, 1])) assert.equal(highlighted[0], lines[0]) assert.equal(highlighted[1], `a\u001b[7m界b\u001b[0m`) assert.equal(highlighted[2], `\u001b[7me\u0301\u001b[0mx`) assert.equal(highlighted[3], lines[3]) assert.equal(stringWidth(highlighted[1]!), stringWidth(lines[1]!)) assert.equal(stringWidth(highlighted[2]!), stringWidth(lines[2]!))})
test("highlighting strips old styling only on a selected row", () => { const styled = "\u001b[31mred\u001b[0m" assert.deepEqual( highlightSelection([styled, styled], 0, range([0, 1], [0, 2])), [`r\u001b[7me\u001b[0md`, styled], ) assert.deepEqual(highlightSelection([styled], 0, range([0, 1], [0, 1])), [styled])})