Fix step 1: for dev-local uses, properly detect local Git branch and commit

1 files changed, 30 insertions, 0 deletions

diff --git a/lib/detectLocalGit.js b/lib/detectLocalGit.js
new file mode 100644
index 0000000..2d0fba0
--- /dev/null
+++ b/lib/detectLocalGit.js
@@ -0,0 +1,30 @@
+var fs = require('fs');
+var path = require('path');
+
+var REGEX_BRANCH = /^ref: refs\/heads\/(\w+)$/;
+
+module.exports = function detectLocalGit(knownCommit, knownBranch) {
+  var dir = process.cwd(), gitDir;
+  while ('/' !== dir) {
+    gitDir = path.join(dir, '.git');
+    if (fs.existsSync(path.join(gitDir, 'HEAD')))
+      break;
+
+    dir = path.dirname(dir);
+  }
+
+  if ('/' === dir)
+    return;
+
+  var head = strip(fs.readFileSync(path.join(dir, '.git', 'HEAD'), 'utf-8'));
+  var branch = (head.match(REGEX_BRANCH) || [])[1];
+  if (!branch)
+    return { git_commit: head };
+
+  var commit = strip(fs.readFileSync(path.join(dir, '.git', 'refs', 'heads', branch), 'utf-8'));
+  return { git_commit: commit, git_branch: branch };
+};
+
+function strip(str) {
+  return (str || '').replace(/^\s+|\s+$/g, '');
+}