Adding the Version Restrict plugin

addons/version_restrict/plugin.cfg

@@ -0,0 +1,7 @@
+[plugin]
+
+name="VersionRestrict"
+description="Restricts the Godot Engine version that can be used by the developer."
+author="Orthogonal Projects"
+version="1.0"
+script="plugin.gd"

addons/version_restrict/plugin.gd

@@ -0,0 +1,81 @@
+tool
+extends EditorPlugin
+
+var confirm_modal: AcceptDialog
+var exit_on_hide: bool = true
+
+var target_engine_property = "global/target_engine_version"
+
+################################################################################
+# _enter_tree
+#
+# When the plugin loads read the target_engine_version from the project config
+# and compare it to the current engine version.
+################################################################################
+func _enter_tree():
+	var target_engine_version = ProjectSettings.get(target_engine_property)
+
+	var engine_info = Engine.get_version_info()
+	var current_engine_version = "{major}.{minor}.{patch}".format({
+		"major": engine_info.major,
+		"minor": engine_info.minor,
+		"patch": engine_info.patch,
+	})
+
+	# Set the target version to the current version on first run.
+	if target_engine_version == null:
+		ProjectSettings.set(target_engine_property, current_engine_version)
+		target_engine_version = current_engine_version
+
+	if target_engine_version != current_engine_version:
+
+		confirm_modal = AcceptDialog.new()
+
+		# Remove the `X` button in the top right. We cant remove it compleetly
+		# without effecting the stability of the engine so it is just hidden.
+		confirm_modal.get_close_button().hide()
+
+		# Rename "Ok" confirmation button to "Close Godot"
+		confirm_modal.get_ok().text = "Close Godot"
+
+		get_editor_interface().get_editor_viewport().add_child(confirm_modal)
+
+		confirm_modal.dialog_text = "You are using v"+current_engine_version+" of the Godot Engine to run this project.\n\nThis project wants you to use v"+target_engine_version+" instead.\n\nIf you beleive this is incorrect you can \n- Change the target engin version in:\n    'Project Settings' -> 'Global' -> 'Target Engine Version'\nor\n-  Disable the 'Version Restrict' plugin"
+
+		# Center the panel on the screen
+		confirm_modal.anchor_left = 0.5
+		confirm_modal.anchor_top = 0.5
+		confirm_modal.anchor_right = 0.5
+		confirm_modal.anchor_bottom = 0.5
+		confirm_modal.margin_left = -confirm_modal.rect_size.x/2
+		confirm_modal.margin_top = -confirm_modal.rect_size.y/2
+
+		# Cause the program to exit when the modal is hidden
+		confirm_modal.connect("hide", self, "_accept_dialog_hidden")
+
+		# TODO: Add a button to bring you to the download page for the correct version
+
+		confirm_modal.show()
+
+
+################################################################################
+# _accept_dialog_hidden
+#
+# Triggers when the accept dialog is hidden by any means. Will close the Godot
+# editor unless self.exit_on_hide has been set to false somewhere.
+################################################################################
+func _accept_dialog_hidden():
+	if self.exit_on_hide:
+		get_tree().quit()
+
+
+################################################################################
+# _exit_tree
+#
+# If an AcceptDialog was created when this plugin entered the tree then remove
+# it. This will prevent the program from exiting when the dialog is closed.
+################################################################################
+func _exit_tree():
+	if confirm_modal:
+		self.exit_on_hide = false
+		confirm_modal.queue_free()

project.godot

@@ -50,11 +50,13 @@ window/per_pixel_transparency/enabled=true
 [editor_plugins]
 
 enabled=PoolStringArray( "res://addons/protobuf/plugin.cfg" )
+enabled=PoolStringArray( "res://addons/version_restrict/plugin.cfg" )
 
 [global]
 
 logg=true
 logging=true
+target_engine_version="3.3.2"
 
 [rendering]