Hello Code

build/lib/git.js

@@ -0,0 +1,52 @@
+var path = require('path');
+var fs = require('fs');
+
+exports.getVersion = function (repo) {
+	var git = path.join(repo, '.git');
+	var headPath = path.join(git, 'HEAD');
+	var head;
+
+	try {
+		head = fs.readFileSync(headPath, 'utf8').trim();
+	} catch (e) {
+		return void 0;
+	}
+
+	if (/^[0-9a-f]{40}$/i.test(head)) {
+		return head;
+	}
+
+	var refMatch = /^ref: (.*)$/.exec(head);
+
+	if (!refMatch) {
+		return void 0;
+	}
+
+	var ref = refMatch[1];
+	var refPath = path.join(git, ref);
+
+	try {
+		return fs.readFileSync(refPath, 'utf8').trim();
+	} catch (e) {
+		// noop
+	}
+
+	var packedRefsPath = path.join(git, 'packed-refs');
+	var refsRaw;
+
+	try {
+		refsRaw = fs.readFileSync(packedRefsPath, 'utf8').trim();
+	} catch (e) {
+		return void 0;
+	}
+
+	var refsRegex = /^([0-9a-f]{40})\s+(.+)$/gm;
+	var refsMatch;
+	var refs = {};
+
+	while (refsMatch = refsRegex.exec(refsRaw)) {
+		refs[refsMatch[2]] = refsMatch[1];
+	}
+
+	return refs[ref];
+};