Script Update Checker

Check scripts for functions which needs to be updated to the latest Blender.

Where

Find it in the Text Editor Sidebar.

How

1. Open the script in question in the Text Editor and execute the operator in the sidebar.
2. All items with issues will be listed in the sidebar.
3. Click on an issue to go to that line.
4. Fix the line.

Addtional feature

In Update Script panel you will also find:

• Insert Classes : Create a tuple listing classes names in current text at cursor position.
• bl_info to manifest : Get infos from bl_info in current text and reformat for Blender 4.2+ Extensions info format.
  Text is added to clipboard, ready to paste in a blender_manifest.toml file at the root of the addon.
• Create manifest file : Directly write the blender_manifest.toml file on disk, in the same folder of the loaded text file (it will ask to overwrite if the manifest already exists)

GPv2 to GPv3 update notes

Following the full rewrite of Grease pencil shipped in Blender 4.3+, the API terms updater include search and replaces for Grease pencil V2 to V3.

Some links related to Grease pencil V3

Changes and API equivalences are listed in the official GP migration page.

The examples in using attribute page are really useful now that Grease Pencil fully uses attributes (allowing use in geometry nodes)

The architecture internal attribute page depicts the structure of Grease pencil V3

Extra migration helpers

The addons works well with the search & replace to update parts of yours script, but of course it does not cover all the things to change.

Also, you might want to affect multiple files at once using an external IDE.
So here is a list of search and replaces, regexes and extra notes as a complement for the official migration page.
It's still recommended to apply the replaces one by one to avoid false-positive replace.

Note: This is provided "as is", no one is responsible if there are error or if it breaks your script ;)

Search and replace

	Search	Replace
layer name	.info	.name
modifier access	.grease_pencil_modifiers	.modifiers
active frame	.active_frame	.current_frame()

Regex search and replace

Those marked with /!\ in notes column must be handled with extra care

Before replacing context modes below, first replace mode_set operator (if any) from GPENCIL_EDIT to EDIT.
This will avoid replacing it by the context_mode name by mistake: bpy.ops.object.mode_set(mode='EDIT_GPENCIL') > to > bpy.ops.object.mode_set(mode='EDIT')

	Search	Replace	Notes
GP type string	('|")GPENCIL(\1)	$1GREASEPENCIL$1	quotes avoid matching GPENCIL within strings
context modes	('|")(PAINT|EDIT|SCULPT|WEIGHT)_GPENCIL(\1)	$1$2_GREASE_PENCIL$1	/!\ ops object.mode_set use just "EDIT"
position attribute	\.co(?!\w)	.position	/!\ vertices and fcurvce points still use .co
drawing container	(?<!drawing)\.strokes	.drawing.strokes	Regex check if 'drawing' keyword is already there
obsolete update	.*(?:points|strokes).update\(\))	\1# \2	Comment point/stroke update(), empty the replace field to remove

Modifiers

For most modifier type, just a prefix change, GP_ becomes GREASE_PENCIL_. Here is a regex for those:

search : ('\|")GP_(LATTICE|BUILD|NOISE|TIME|TEXTURE|DASH|ENVELOPE|LENGTH|MIRROR|MULTIPLY|OUTLINE|SIMPLIFY|SUBDIV|ARMATURE|HOOK|OFFSET|SMOOTH|COLOR|OPACITY|TINT|ARRAY)(\1)
replace: $1GP_$2$1

List of other modifier type with name changed:

Search	Replace
GP_WEIGHT_PROXIMITY	GREASE_PENCIL_VERTEX_WEIGHT_PROXIMITY
GP_WEIGHT_ANGLE	GREASE_PENCIL_VERTEX_WEIGHT_ANGLE
GP_LINEART	LINEART
GP_THICK	GREASE_PENCIL_THICKNESS

/!\ special case: SHRINKWRAP becomes GREASE_PENCIL_SHRINKWRAP but in 4.2 the name was the same for other object type (not GP only), so cannot be batch replaced.

Operators

	Blender 4.2	Blender 4.3
vertex group assign	bpy.ops.gpencil.vertex_group_assign()	bpy.ops.object.vertex_group_assign()

bpy.types

Blender 4.2	Blender 4.3
VIEW3D_MT_edit_gpencil_transform	VIEW3D_MT_transform
VIEW3D_MT_edit_gpencil_stroke	VIEW3D_MT_edit_greasepencil_stroke
VIEW3D_MT_brush_gpencil_context_menu	VIEW3D_MT_brush_context_menu
GPENCIL_MT_layer_context_menu	GREASE_PENCIL_MT_grease_pencil_add_layer_extra
GPENCIL_MT_cleanup	VIEW3D_MT_edit_greasepencil_cleanup
VIEW3D_MT_gpencil_edit_context_menu	VIEW3D_MT_greasepencil_edit_context_menu

Replace with tweaks needed

	Search	Replace	Notes
Multiframe mode	.use_multiedit	context.scene.tool_settings.use_grease_pencil_multi_frame_editing	Not stored on GP.data anymore, now a scene setting
Remove Stroke	strokes.remove(	drawing.remove_strokes(indices=(0,))	Not using a stroke object, but a list of stroke indices in drawing.
Add strokes	strokes.new()	drawing.add_strokes([0])	int sequence: [2,4] will add one stroke with 2 points and one with 4

About Script Update Checker addon

nBurn writes: "Add-on update helper script

I found I was regularly overlooking outdated code when doing add-on updates, so I made a very basic helper script to speed up the update process. This script goes through an add-on files and look for lines that might have outdated 2.7x code. If possibly outdated code is found, the code and its line number are printed in the console along with a small note on what to look at.

Please keep in mind this script will not catch everything and tends to generate a lot of false positives, but it has saved me quite a bit of time when updating add-ons for 2.8."

His commandline version is found here: https://blenderartists.org/t/2-80-cheat-sheet-for-updating-add-ons/1148974/48