Add repo.js

This is our git wrapper. I tried using gift but it's painful.

server/repo.js

@@ -0,0 +1,52 @@
+'use strict';
+
+var exec = require('child_process').exec,
+    debug = require('debug')('repo.js');
+
+exports = module.exports = {
+    initialize: initialize,
+    head: null,
+    tree: tree
+};
+
+var gitDir;
+
+function git(command, callback) {
+    var options = {
+        env: { GIT_DIR: gitDir }
+    };
+    exec('git ' + command, options, function (error, stdout, stderr) {
+        if (error) return callback(error);
+        return callback(null, stdout);
+    });
+}
+
+function initialize(config, callback) {
+    gitDir = config.root + '/.git';
+
+    git('rev-parse HEAD', function (err, sha1) {
+        if (err) return callback(err);
+        exports.head = sha1;
+        callback();
+    });
+}
+
+function tree(treeish, callback) {
+    git('ls-tree -r ' + treeish, function (err, out) {
+        var lines = out.split('\n');
+        var entries = [ ];
+        lines.forEach(function (line) {
+            var id, mode, name, type, _ref;
+            // sample line : 100644 blob e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 README
+            var parts = line.split(/[\t ]+/, 4);
+            var mode = parts[0], type = parts[1], name = parts[3];
+            entries.push({
+                stat: { mode: parseInt(parts[0], 8) }, // match fs.Stat object
+                sha1: parts[2],
+                path: parts[3]
+            });
+        });
+        callback(null, entries);
+    });
+}
+

server/server.js

@@ -12,7 +12,9 @@ var optimist = require('optimist'),
     mkdirp = require('mkdirp'),
     db = require('./database'),
     sync = require('./sync'),
-    routes = require('./routes');
+    routes = require('./routes'),
+    repo = require('./repo'),
+    debug = require('debug');
 
 var argv = optimist.usage('Usage: $0 --root <directory>')
     .alias('h', 'help')
@@ -77,7 +79,7 @@ app.configure(function () {
     app.post('/file', routes.file.update);
 });
 
-function initialize() {
+function initialize(callback) {
     var config = {
         port: argv.p || 3000,
         root: path.resolve(argv.r)
@@ -87,13 +89,14 @@ function initialize() {
 
     mkdirp(config.root);
     if (!db.initialize(config)) {
-        console.error('Error initializing database');
-        process.exit(1);
+        return callback(new Error('Error initializing database'));
     }
 
     sync.initialize(config);
     routes.file.initialize(config, sync);
     routes.volume.initialize(config, app);
+
+    repo.initialize(config, callback);
 }
 
 function listen(next) {
@@ -103,10 +106,17 @@ function listen(next) {
         console.log('Server listening on port ' + app.get('port') + ' in ' + app.get('env') + ' mode');
         next();
     });
+
+    repo.tree(repo.head, function (err, entries) { console.log(entries); });
 }
 
 if (require.main === module) {
-    initialize();
-    listen();
+    initialize(function (err) {
+        if (err) {
+            console.error('error initializing', err);
+            process.exit(1);
+        }
+        listen();
+    });
 }