| 1 | /** |
| 2 | * Converts gitignore-style rules into glob patterns for tools like tinyglobby's {@link https://superchupu.dev/tinyglobby/documentation#ignore `ignore`} option. |
| 3 | * |
| 4 | * Gitignore and glob differ (ordering, negation, escapes). This maps the common cases: |
| 5 | * |
| 6 | * - Rules with no `/` match at any depth → \`**\/name\`, \`**\/name\/\*\/` |
| 7 | * - A leading `/` anchors to the ignore file's directory (use the same `cwd` in tinyglobby) → `name`, `name/**` |
| 8 | * - A `/` in the pattern (not only leading) uses path-aware matching → `a/b`, `a/b/**` |
| 9 | * - A trailing `/` restricts to directories → adds `/**` as needed |
| 10 | * - Lines starting with `!` (negation) are returned with a `!` prefix for use in **positive** glob |
| 11 | * lists; filter them out when passing only exclusion patterns to an `ignore` array |
| 12 | * |
| 13 | * Does not implement full gitignore escaping (e.g. `\\ ` for trailing space) or `**` edge cases |
| 14 | * identical to git; escape handling can be added later if needed. |
| 15 | */ |
| 16 | export function gitignoreRulesToGlobs(rules: ReadonlyArray<string>): string[] { |
| 17 | const out: string[] = []; |
| 18 | for (const raw of rules) { |
| 19 | const line = raw.trim(); |
| 20 | if (line.length === 0 || line.startsWith("#")) { |
| 21 | continue; |
| 22 | } |
| 23 | let negated = false; |
| 24 | let rest = line; |
| 25 | if (rest.startsWith("!")) { |
| 26 | negated = true; |
| 27 | rest = rest.slice(1).trim(); |
| 28 | if (rest.length === 0 || rest.startsWith("#")) { |
| 29 | continue; |
| 30 | } |
| 31 | } |
| 32 | let dirOnly = rest.endsWith("/"); |
| 33 | if (dirOnly) { |
| 34 | rest = rest.slice(0, -1); |
| 35 | } |
| 36 | rest = rest.replace(/\\/g, "/"); |
| 37 | if (rest.length === 0) { |
| 38 | continue; |
| 39 | } |
| 40 | const anchored = rest.startsWith("/"); |
| 41 | if (anchored) { |
| 42 | rest = rest.slice(1); |
| 43 | } |
| 44 | if (rest.length === 0) { |
| 45 | continue; |
| 46 | } |
| 47 | const hasSlash = rest.includes("/"); |
| 48 | const globs = ruleBodyToGlobs(rest, { anchored, hasSlash, dirOnly }); |
| 49 | for (const g of globs) { |
| 50 | out.push(negated ? `!${g}` : g); |
| 51 | } |
| 52 | } |
| 53 | return out; |
| 54 | } |
| 55 | |
| 56 | function ruleBodyToGlobs( |
| 57 | body: string, |
| 58 | opts: { anchored: boolean; hasSlash: boolean; dirOnly: boolean }, |
| 59 | ): string[] { |
| 60 | const { anchored, hasSlash, dirOnly } = opts; |
| 61 | if (dirOnly) { |
| 62 | if (anchored) { |
| 63 | return [`${body}/**`]; |
| 64 | } |
| 65 | if (hasSlash) { |
| 66 | return [`${body}/**`]; |
| 67 | } |
| 68 | return [`**/${body}/**`]; |
| 69 | } |
| 70 | if (anchored) { |
| 71 | if (hasSlash) { |
| 72 | return [body, `${body}/**`]; |
| 73 | } |
| 74 | return [body, `${body}/**`]; |
| 75 | } |
| 76 | if (hasSlash) { |
| 77 | return [body, `${body}/**`]; |
| 78 | } |
| 79 | return [`**/${body}`, `**/${body}/**`]; |
| 80 | } |