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TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051import stringWidth from "string-width"import wrapAnsi from "wrap-ansi"import { highlightCode } from "./markdown.js"
const foreground = (code: number, text: string): string => `\x1b[${code}m${text}\x1b[39m`const background = (tone: "add" | "remove" | "panel"): string => ({ add: "\x1b[48;2;24;53;39m", remove: "\x1b[48;2;59;35;40m", panel: "\x1b[48;2;37;40;50m",})[tone]const language = (path: string): string => ({ ts: "typescript", tsx: "typescript", js: "javascript", jsx: "javascript", py: "python", rs: "rust", sh: "bash" })[path.split(".").at(-1) ?? ""] ?? "text"const clean = (text: string): string => text.replace(/[\p{Cc}\p{Cf}]/gu, char => char === "\t" ? " " : " ")
/** Full-width diff rows: a line-number gutter, colored change blocks, wrapped content. */export function renderDiff(diff: string, path: string, width: number): string[] { const columns = Math.max(1, width) if (columns < 8) return ["…".slice(0, columns)] const rows: string[] = [] let oldLine = 0 let newLine = 0 const lang = language(path) const row = (gutter: string, content: string, tone: "add" | "remove" | "panel", syntax = false): void => { const available = Math.max(1, columns - stringWidth(gutter)) const styled = syntax ? highlightCode(content, lang).replaceAll("\x1b[0m", "\x1b[39;22;23m") : foreground(90, content) const parts = wrapAnsi(styled, available, { hard: true, trim: false }).split("\n") for (const [index, part] of parts.entries()) { const prefix = index === 0 ? gutter : " ".repeat(stringWidth(gutter)) const body = prefix + part rows.push(background(tone) + body + " ".repeat(Math.max(0, columns - stringWidth(body))) + "\x1b[0m") } } row(" ", clean(path), "panel") for (const line of diff.split("\n")) { if (!line) continue if (line.startsWith("--- ") || line.startsWith("+++ ")) continue const hunk = /^@@ -(\d+)(?:,\d+)? \+(\d+)(?:,\d+)? @@(.*)/.exec(line) if (hunk) { oldLine = Number(hunk[1]); newLine = Number(hunk[2]) row(" ⋮ ", clean(line), "panel") } else if (line.startsWith("+")) { row(foreground(32, `${String(newLine++).padStart(4)} + `), clean(line.slice(1)), "add", true) } else if (line.startsWith("-")) { row(foreground(31, `${String(oldLine++).padStart(4)} - `), clean(line.slice(1)), "remove", true) } else if (line.startsWith(" ")) { row(foreground(90, `${String(newLine++).padStart(4)} `), clean(line.slice(1)), "panel", true) oldLine++ } else { row(" ⋮ ", clean(line), "panel") } } return rows}