mirror of
https://github.com/documentationjs/documentation.git
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65 lines
2.3 KiB
JavaScript
65 lines
2.3 KiB
JavaScript
var fs = require('fs');
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var path = require('path');
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var gitUrlParse = require('git-url-parse');
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var getRemoteOrigin = require('remote-origin-url');
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/**
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* Sometimes git will [pack refs](https://git-scm.com/docs/git-pack-refs)
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* in order to save space on disk and
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* duck under limits of numbers of files in folders. CircleCI in particular
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* does this by default. This method parses that `packed-refs` file
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*
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* @private
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* @param {string} packedRefs string contents of the packed refs file
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* @param {string} branchName the branch name to resolve to
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* @returns {string} sha hash referring to current tree
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*/
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function parsePackedRefs(packedRefs, branchName) {
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return packedRefs.split(/\n/)
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.filter(function (line) {
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return line[0] !== '#' && line[0] !== '^';
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})
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.reduce(function (memo, line) {
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memo[line.split(' ')[1]] = line.split(' ')[0];
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return memo;
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}, {})[branchName];
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}
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/**
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* Given a a root directory, find its git configuration and figure out
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* the HTTPS URL at the base of that GitHub repository.
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*
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* @param {string} root path at the base of this local repo
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* @returns {string} base HTTPS url of the GitHub repository
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* @throws {Error} if the root is not a git repo
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*/
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function getGithubURLPrefix(root) {
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try {
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var head = fs.readFileSync(path.join(root, '.git', 'HEAD'), 'utf8');
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var branch = head.match(/ref\: (.*)/);
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if (branch) {
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var branchName = branch[1];
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var branchFileName = path.join(root, '.git', branchName);
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var packedRefsName = path.join(root, '.git', 'packed-refs');
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var sha;
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if (fs.existsSync(branchFileName)) {
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sha = fs.readFileSync(branchFileName, 'utf8');
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} else if (fs.existsSync(packedRefsName)) {
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// packed refs are a compacted version of the refs folder. usually
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// you have a folder filled with files that just contain sha
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// hashes. since this folder can be really big, packed refs
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// stores all the refs in one file instead.
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sha = parsePackedRefs(fs.readFileSync(packedRefsName, 'utf8'), branchName);
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}
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} else {
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sha = head;
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}
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return gitUrlParse(getRemoteOrigin.sync(root)).toString('https') + '/blob/' + sha.trim() + '/';
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} catch (e) {
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return null;
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}
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}
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module.exports = getGithubURLPrefix;
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module.exports.parsePackedRefs = parsePackedRefs;
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