Add the libs and mods directories to the list in launcher.

launcher/game/front_page.rpy

@@ -157,8 +157,10 @@ screen front_page_project:
                 label _("Open Directory") style "l_label_small"
 
                 frame style "l_indent":
-                    has vbox
-                    for button_name, path in p.data["renpy_launcher"]["open_directory"].items():
+                    has grid 2 max(5, (len(p.get_renpy_launcher()["open_directory"]) + 1) // 2):
+                        transpose True xfill True
+
+                    for button_name, path in p.get_renpy_launcher()["open_directory"].items():
                         textbutton button_name action OpenDirectory(os.path.join(p.path, path), absolute=True)
 
             vbox:
@@ -169,7 +171,7 @@ screen front_page_project:
                     frame style "l_indent":
                         has vbox
 
-                        for button_name, path in p.data["renpy_launcher"]["edit_file"].items():
+                        for button_name, path in p.get_renpy_launcher()["edit_file"].items():
                             textbutton button_name action editor.Edit(path, check=True)
 
                         if editor.CanEditProject():

launcher/game/project.rpy

@@ -92,6 +92,10 @@ init python in project:
             # The mtime of the last dump file loaded.
             self.dump_mtime = 0
 
+            # A processed version of data['renpy_launcher'] with missing files
+            # and directories removed.
+            self.renpy_launcher = None
+
         def get_dump_filename(self):
 
             if os.path.exists(os.path.join(self.gamedir, "saves")):
@@ -123,25 +127,6 @@ init python in project:
         def update_data(self):
             data = self.data
 
-            data.setdefault("renpy_launcher",
-            {
-                "open_directory":
-                {
-                    "game": "game",
-                    "base": ".",
-                    "images": "game/images",
-                    "audio": "game/audio",
-                    "gui": "game/gui"
-                },
-                "edit_file":
-                {
-                    "script.rpy": "game/script.rpy",
-                    "options.rpy": "game/options.rpy",
-                    "gui.rpy": "game/gui.rpy",
-                    "screens.rpy": "game/screens.rpy"
-                }
-            })
-
             data.setdefault("build_update", False)
             data.setdefault("packages", [ "pc", "mac" ])
             data.setdefault("add_from", True)
@@ -175,6 +160,43 @@ init python in project:
                 data["renamed_steam"] = True
 
 
+        def get_renpy_launcher(self):
+
+            if self.renpy_launcher is not None:
+                return self.renpy_launcher
+
+            rv = { }
+
+            default_values = {
+                "open_directory":
+                {
+                    "game": "game",
+                    "base": ".",
+                    "images": "game/images",
+                    "audio": "game/audio",
+                    "gui": "game/gui",
+                    "libs": "game/libs",
+                    "mods": "game/mods",
+                },
+                "edit_file":
+                {
+                    "script.rpy": "game/script.rpy",
+                    "options.rpy": "game/options.rpy",
+                    "gui.rpy": "game/gui.rpy",
+                    "screens.rpy": "game/screens.rpy"
+                }
+            }
+
+            for k, default_d in default_values.items():
+                d = self.data.get("renpy_launcher", {}).get(k, default_d)
+                rv[k] = { name : path for name, path in d.items() if os.path.exists(os.path.join(self.path, path)) }
+
+            self.renpy_launcher = rv
+
+            return rv
+
+
+
         def make_tmp(self):
             """
             Makes the project's temporary directory, if it doesn't exist