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[codex] cache markdown dependency hashes #2335

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[codex] cache markdown dependency hashes #2335

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21 changes: 18 additions & 3 deletions src/loaders/markdown/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -424,11 +424,26 @@ function emit(this: any, opts: IMdLoaderOptions, ret: IMdTransformerResult) {
}
}

const fileHashCache = new Map<string, { signature: string; hash: string }>();

function getCachedFileHash(file: string) {
const stat = fs.statSync(file, { bigint: true });
const signature = `${stat.mtimeNs}:${stat.size}`;
const cached = fileHashCache.get(file);

if (cached?.signature === signature) {
return cached.hash;
}

const hash = getContentHash(fs.readFileSync(file, 'utf-8'));
fileHashCache.set(file, { signature, hash });

return hash;
}

function getDepsCacheKey(deps: (typeof depsMapping)['0'] = []) {
return JSON.stringify(
deps.map(
(file) => `${file}:${getContentHash(fs.readFileSync(file, 'utf-8'))}`,
),
deps.map((file) => `${file}:${getCachedFileHash(file)}`),
);
}

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