1 files changed, 42 insertions, 0 deletions
diff --git a/lib/cli/watch.js b/lib/cli/watch.js
new file mode 100644
index 0000000..36c42cc
--- /dev/null
+++ b/lib/cli/watch.js
@@ -0,0 +1,42 @@
+var _ = require('lodash');
+var path = require('path');
+var chokidar = require('chokidar');
+var parsers = require('gitbook-parsers');
+
+var Promise = require('../utils/promise');
+
+// Watch a folder and resolve promise once a file is modified
+function watch(dir) {
+    var d = Promise.defer();
+    dir = path.resolve(dir);
+
+    var toWatch = [
+        'book.json', 'book.js'
+    ];
+
+    // Watch all parsable files
+    _.each(parsers.extensions, function(ext) {
+        toWatch.push('**/*'+ext);
+    });
+
+    var watcher = chokidar.watch(toWatch, {
+        cwd: dir,
+        ignored: '_book/**',
+        ignoreInitial: true
+    });
+
+    watcher.once('all', function(e, filepath) {
+        watcher.close();
+
+        d.resolve(filepath);
+    });
+    watcher.once('error', function(err) {
+        watcher.close();
+
+        d.reject(err);
+    });
+
+    return d.promise;
+}
+
+module.exports = watch;