From 651f9e7747f5d73f73f35d74af9978994643e915 Mon Sep 17 00:00:00 2001
From: Pullusb <bernou.samuel@gmail.com>
Date: Tue, 25 Jan 2022 15:13:08 +0100
Subject: [PATCH] Layer name manager fix modifier targets

1.9.4

- feat: renaming using the name_manager take care of changing layer target values in GP modifiers
---
 CHANGELOG.md        |  4 ++++
 OP_layer_manager.py | 19 +++++++++++++++++--
 __init__.py         |  2 +-
 3 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 609bb16..9388bdd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+1.9.4
+
+- feat: renaming using the name_manager take care of changing layer target values in GP modifiers
+
 1.9.3
 
 - feat: Add an update button at bottom of preferences if addon is a cloned repository
diff --git a/OP_layer_manager.py b/OP_layer_manager.py
index f22ee37..cd96dca 100644
--- a/OP_layer_manager.py
+++ b/OP_layer_manager.py
@@ -23,12 +23,14 @@ PATTERN = r'^(?P<grp>-\s)?(?P<tag>[A-Z]{2}_)?(?P<name>.*?)(?P<sfix>_[A-Z]{2})?(?
 
 
 def layer_name_build(layer, prefix='', desc='', suffix=''):
-    '''GET a layer and argumen to build and assign name'''
+    '''GET a layer and argument to build and assign name
+    return new name
+    '''
 
 
     prefs = get_addon_prefs()
     sep = prefs.separator
-    name = layer.info
+    name = old = layer.info
     
     pattern = PATTERN.replace('_', sep) # set separator
     
@@ -68,6 +70,19 @@ def layer_name_build(layer, prefix='', desc='', suffix=''):
     new = f'{grp}{tag}{name}{sfix}'
 
     layer.info = new
+    
+    ## update name in modifier targets
+    if old != new:
+        # find objects using this GP datablock
+        for ob_user in [o for o in bpy.data.objects if o.data == layer.id_data]: # bpy.context.scene.objects
+            # maybe a more elegant way exists to find all objects users ?
+            
+            # update Gpencil modifier targets
+            for mod in ob_user.grease_pencil_modifiers:
+                if not hasattr(mod, 'layer'):
+                    continue
+                if mod.layer == old:
+                    mod.layer = new
 
 """ 
 def layer_name_build(layer, prefix='', prefix2='', desc='', suffix=''):
diff --git a/__init__.py b/__init__.py
index de96b3d..d98c894 100755
--- a/__init__.py
+++ b/__init__.py
@@ -15,7 +15,7 @@ bl_info = {
 "name": "GP toolbox",
 "description": "Tool set for Grease Pencil in animation production",
 "author": "Samuel Bernou, Christophe Seux",
-"version": (1, 9, 3),
+"version": (1, 9, 4),
 "blender": (2, 91, 0),
 "location": "Sidebar (N menu) > Gpencil > Toolbox / Gpencil properties",
 "warning": "",