Android permissions

* Patched If function to work with actions
* Added AskPermission class action
* Added storage permission request for mods menu

game/scripts/gui/main_menu.rpy

@@ -278,7 +278,7 @@ screen navigation(title=None):
         textbutton _("Preferences") action ShowMenu("preferences") sensitive is_sensitive
 
         if main_menu:
-            textbutton _("Mods") sensitive (bool(mods_list) and is_sensitive) action ShowMenu("mods")
+            textbutton _("Mods") sensitive (bool(mods_list) and is_sensitive) action If(AskPermission("android.permission.WRITE_EXTERNAL_STORAGE"), ShowMenu("mods"), Function(renpy.notify, "Please grant storage permissions to enable modding functionality."))
             textbutton _("Credits") action Jump("credits") sensitive is_sensitive
             if not renpy.mobile:
                 textbutton _("Quit") action Quit(confirm=not main_menu) sensitive is_sensitive

game/scripts/mods.rpy

@@ -80,3 +80,13 @@ init python:
                 mods.add(name)
 
             renpy.restart_interaction()
+
+    class AskPermission(Action, NoRollback):
+        def __init__(self, name):
+            self.name = name
+
+        def __call__(self):
+            if not renpy.android:
+                return True
+
+            return renpy.android and (renpy.check_permission(self.name) or renpy.request_permission(self.name))

game/scripts/options.rpy

@@ -180,3 +180,5 @@ init python:
     build.classify("cache/**", "android")
     build.classify("game/saves/**", None)
     build.classify("game/mods/**", None)
+
+    build.android_permissions = ["android.permission.WRITE_EXTERNAL_STORAGE"]

game/scripts/utility/engine.rpy

@@ -202,3 +202,12 @@ init -100 python:
 
             for k, v in compressed.items():
                 setattr(self, k, v)
+
+    # The original does not support nested actions.
+    @renpy.pure
+    def If(expression, true=None, false=None):
+
+        if isinstance(expression, Action):
+            expression = expression()
+
+        return true if expression else false