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var fs = require('fs');
var path = require('path');
// branch naming only has a few excluded characters, see git-check-ref-format(1)
var REGEX_BRANCH = /^ref: refs\/heads\/([^?*\[\\~^:]+)$/;
module.exports = function detectLocalGit() {
var dir = process.cwd(), gitDir;
while (path.resolve('/') !== dir) {
gitDir = path.join(dir, '.git');
var existsSync = fs.existsSync || path.existsSync;
if (existsSync(path.join(gitDir, 'HEAD')))
break;
dir = path.dirname(dir);
}
if (path.resolve('/') === dir)
return;
var head = fs.readFileSync(path.join(dir, '.git', 'HEAD'), 'utf-8').trim();
var branch = (head.match(REGEX_BRANCH) || [])[1];
if (!branch)
return { git_commit: head };
var commit = _parseCommitHashFromRef(dir, branch);
return { git_commit: commit, git_branch: branch };
};
function _parseCommitHashFromRef(dir, branch) {
var ref = path.join(dir, '.git', 'refs', 'heads', branch);
if (fs.existsSync(ref)) {
return fs.readFileSync(ref, 'utf-8').trim();
} else {
// ref does not exist; get it from packed-refs
var commit = '';
var packedRefs = path.join(dir, '.git', 'packed-refs');
var packedRefsText = fs.readFileSync(packedRefs, 'utf-8');
packedRefsText.split('\n').forEach(function (line) {
if (line.match('refs/heads/'+branch)) {
commit = line.split(' ')[0];
}
});
return commit;
}
}
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