git ssb

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import { STORE_LINKS, retrieveDenominator,
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  substituteDenominator } from '../prelude/common.js';
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import path from 'path';
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const win32 = process.platform === 'win32';
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function hasParent (file, records) {
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  const dirname = path.dirname(file);
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  if (dirname === file) return false; // root directory
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  return Boolean(records[dirname]);
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}
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function purgeTopDirectories (records) {
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  while (true) {
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    let found = false;
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    for (const file in records) {
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      const record = records[file];
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      const links = record[STORE_LINKS];
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      if (links && links.length === 1) {
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        if (!hasParent(file, records)) {
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          const file2 = path.join(file, links[0]);
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          const record2 = records[file2];
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          const links2 = record2[STORE_LINKS];
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          if (links2 && links2.length === 1) {
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            const file3 = path.join(file2, links2[0]);
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            const record3 = records[file3];
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            const links3 = record3[STORE_LINKS];
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            if (links3) {
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              delete records[file];
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              found = true;
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            }
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          }
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        }
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      }
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    }
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    if (!found) break;
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  }
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}
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function denominate (records, entrypoint, denominator) {
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  const newRecords = {};
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  for (const file in records) {
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    let snap = substituteDenominator(file, denominator);
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    if (win32) {
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      if (snap.slice(1) === ':') snap += '\\';
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    } else {
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      if (snap === '') snap = '/';
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    }
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    newRecords[snap] = records[file];
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  }
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  return {
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    records: newRecords,
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    entrypoint: substituteDenominator(entrypoint, denominator)
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  };
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}
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export default function (records, entrypoint) {
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  purgeTopDirectories(records);
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  const denominator = retrieveDenominator(Object.keys(records));
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  return denominate(records, entrypoint, denominator);
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}
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