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package.json000064400000002031151701451750007034 0ustar00{
  "_id": "common-ancestor-path@1.0.1",
  "_inBundle": true,
  "_location": "/npm/common-ancestor-path",
  "_phantomChildren": {},
  "_requiredBy": [
    "/npm/@npmcli/arborist"
  ],
  "author": {
    "name": "Isaac Z. Schlueter",
    "email": "i@izs.me",
    "url": "https://izs.me"
  },
  "bugs": {
    "url": "https://github.com/isaacs/common-ancestor-path/issues"
  },
  "description": "Find the common ancestor of 2 or more paths on Windows or Unix",
  "devDependencies": {
    "require-inject": "^1.4.4",
    "tap": "^14.10.7"
  },
  "files": [
    "index.js"
  ],
  "homepage": "https://github.com/isaacs/common-ancestor-path#readme",
  "license": "ISC",
  "name": "common-ancestor-path",
  "repository": {
    "type": "git",
    "url": "git+https://github.com/isaacs/common-ancestor-path.git"
  },
  "scripts": {
    "postversion": "npm publish",
    "prepublishOnly": "git push origin --follow-tags",
    "preversion": "npm test",
    "snap": "tap",
    "test": "tap"
  },
  "tap": {
    "check-coverage": true
  },
  "version": "1.0.1"
}
LICENSE000064400000001354151701451750005562 0ustar00The ISC License

Copyright (c) Isaac Z. Schlueter

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
index.js000064400000000731151701451750006220 0ustar00const {parse, sep, normalize: norm} = require('path')

function* commonArrayMembers (a, b) {
  const [l, s] = a.length > b.length ? [a, b] : [b, a]
  for (const x of s) {
    if (x === l.shift())
      yield x
    else
      break
  }
}

const commonAncestorPath = (a, b) => a === b ? a
  : parse(a).root !== parse(b).root ? null
  : [...commonArrayMembers(norm(a).split(sep), norm(b).split(sep))].join(sep)

module.exports = (...paths) => paths.reduce(commonAncestorPath)