[installer] Add default configuration flag (#860)

inginious-install

@@ -14,6 +14,7 @@ import inginious.frontend.installer
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(description='Creates a configuration file for the specified frontend.')
     parser.add_argument("--file", help="Path to configuration file. If not set, use the default for the given frontend.")
+    parser.add_argument("--default", action='store_true', default=False, help="Set all questions to default value.")
     args = parser.parse_args()
 
-    inginious.frontend.installer.Installer(args.file).run()
+    inginious.frontend.installer.Installer(args.file, args.default).run()

inginious/frontend/installer.py

@@ -36,8 +36,9 @@
 class Installer:
     """ Custom installer for the WebApp frontend """
 
-    def __init__(self, config_path=None):
+    def __init__(self, config_path=None, default=False):
         self._config_path = config_path
+        self._default = default
 
     #######################################
     #          Display functions          #
@@ -73,9 +74,12 @@ def _display_big_warning(self, content):
 
     def _ask_with_default(self, question, default=""):
         default = str(default)
-        answer = input(DOC + UNDERLINE + question + " [" + default + "]:" + ENDC + " ")
-        if answer == "":
+        if self._default:
             answer = default
+        else:
+            answer = input(DOC + UNDERLINE + question + " [" + default + "]:" + ENDC + " ")
+            if answer == "":
+                answer = default
         return answer
 
     def _ask_boolean(self, question, default):