Add preferences with default templates with option to set them from env (falling back to prefs) at startup

change default templates to use label instead of name

preferences.py

@@ -0,0 +1,91 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+import bpy
+import os
+
+from bpy.props import (FloatProperty,
+                        BoolProperty,
+                        EnumProperty,
+                        StringProperty,
+                        IntProperty,
+                        PointerProperty,
+                        FloatVectorProperty)
+
+from bpy.app.handlers import persistent
+
+# region Preferences
+
+class RT_prefs(bpy.types.AddonPreferences):
+    bl_idname = __package__
+
+    use_env_base_path_templates : BoolProperty(
+        name="Use Environment Base Path Templates",
+        description="Use environmenet variables to set base path for file output templates\
+            \nFollowing env variable are available:\
+            \nRENDERTOOLBOX_EXR_PATH_TEMPLATE fo single base path file output\
+            \nRENDERTOOLBOX_MULTILAYER_PATH_TEMPLATE for multilayer base path file output",
+        default=True,
+        )
+
+    base_path_template: StringProperty(
+        name="Base Path Template",
+        description="Template for base paths",
+        default="//render/{node_label}/",
+        )
+    
+    base_path_multilayer_template: StringProperty(
+        name="Base Path Multilayer Template",
+        description="Template for base paths of multilayer files",
+        default="//render/{node_label}/{node_label}_",
+        )
+
+    def draw(self, context):
+        layout = self.layout
+        layout.use_property_split = True
+        layout.use_property_decorate = False
+
+        layout.prop(self, "use_env_base_path_templates", text="Use Environment Base Path Templates")
+        col = layout.column()
+        # col.active = not self.use_env_base_path_templates
+        col.prop(self, "base_path_template", text="Base Path Template")
+        col.prop(self, "base_path_multilayer_template", text="Base Path Multilayer Template")
+        
+        if self.use_env_base_path_templates:
+            col.separator()
+            col.label(text="Environment variables will override above templates if set", icon='INFO')
+            # col.label(text="RENDERTOOLBOX_EXR_PATH_TEMPLATE for single base path file output")
+            # col.label(text="RENDERTOOLBOX_MULTILAYER_PATH_TEMPLATE for multilayer base path file output")
+            col.label(text'If environment variables are not found, preferences will be used instead')
+
+
+# region Handlers
+
+@persistent
+def set_render_toolbox_settings(dummy):
+    ## Handler for prefs to scene properties replications
+    prefs = bpy.context.preferences.addons[__package__].preferences
+    reset_scene_path_templates()
+
+# region Register
+
+classes = (
+    RT_prefs,
+)
+
+def register(): 
+    for cls in classes:
+        bpy.utils.register_class(cls)
+
+    # prefs = bpy.context.preferences.addons[__package__].preferences
+
+    if not 'set_render_toolbox_settings' in [hand.__name__ for hand in bpy.app.handlers.load_post]:
+        bpy.app.handlers.load_post.append(set_render_toolbox_settings)
+
+def unregister():
+    if not 'set_render_toolbox_settings' in [hand.__name__ for hand in bpy.app.handlers.load_post]:
+        bpy.app.handlers.load_post.remove(set_render_toolbox_settings)
+
+    for cls in reversed(classes):
+        bpy.utils.unregister_class(cls)
+
+# endregion