blender-extension-builder

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blender-extension-builder

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A builder for blender extensions, which includes grabbing dependency wheels automatically

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# blender-extension-builder
A builder for blender extensions.

Blender allows you to add dependencies via packaging wheels with the extension, however you have to manually grab the wheels and put the filenames in the `blender_manifest.toml` file. This can be cumbersome, especially with many dependencies, and dependencies of dependencies that you don't control. This project aims to aid in that, and make it all a lot easier.

# Installation

Install via pip

```
pip install blender-extension-builder
```

You also need Blender available on the PATH in order to build the extension.

# Usage

You can use the command

```shell
build-blender-extension -h
# or
bbext -h
# or
python -m build_blender_extension -h
```

You can specify the manifest file with the `-m` argument, however if you run the command with no arguments, it will assume that the blender manifest is `blender_manifest.toml`.

```shell
bbext -m blender_manifest.toml
```

If you have any dependencies that have wheels that are built for multiple platforms, then you may want to grab them all.

```shell
bbext --all-wheels
```

However it may take a while to download all the wheels, so this should only be used for distribution.

This can be used in conjunction with `--split-platforms` to generate builds for each platform.

```shell
bbext -a --split-platforms
```

## Setting up `blender_manifest.toml`

Since this aims to make managing dependencies easier, there are a couple things added to the `blender_manifest.toml` file. The file will be structured like any `blender_manifest.toml` file, just with a few new options.

```toml
schema_version = "1.0.0"
id = "my_example_extension"
version = "1.0.0"
name = "My Example Extension"
tagline = "This is another extension"
maintainer = "Developer name <email@address.com>"
type = "add-on"
blender_version_min = "4.2.0"
license = [
  "SPDX:GPL-3.0-or-later",
]

# You can specify what platforms this can be used with.
platforms = ["windows-x64", "windows-arm64", "macos-arm64", "macos-x64" , "linux-x64"]
# NOTE: All wheels for all platforms will be downloaded in you specify `--all-wheels`
# no matter which platforms are specified here.
# NOTE: If `--all-wheels` is specified and the platforms are not specified, it will
# download all the platforms, and generate builds for all platforms.

# Place dependencies here. They have to be in the dependency format as specified in PEP 508.
# https://packaging.python.org/en/latest/specifications/dependency-specifiers/#dependency-specifiers
# (should be the same as in pyproject.toml files)
dependencies = [
    'numpy'
]
# dependencies can also be a path to a file. This does not follow the same rules as requirements.txt
# It instead follows the same rules as dependencies as a list, just with each line being a dependency.
# This can be used if you have some local paths you don't want sharing to the public.
dependencies = 'dependencies.txt'

# Folder to store the wheels in the addon.
wheel-path = './wheels'

# If you would like to manually specify the wheels, you still can.
# This If you also specify dependencies, those will be appended into this.
wheels = [
  './wheels/pillow-10.3.0-cp311-cp311-win_amd64.whl',
]

# Use this if blender is skipping a wheel for python version
# incompatibility (even though it's compatible)
# This can also be enabled in the commandline with `--ensure-cp311` or `-cp311`
ensure-cp311 = true

[build]
# Some optional extra options were added to this table

# Folder containing the source code of the extension. Defaults to the current directory
source = './src'
# Folder for where the extension will be stored
# with all the files (to build the extension). Defaults to ./build
build = './build'
# Output folder for the built addon in the .zip file.
dist = './dist'

# This contains a list of files or folders to keep in the built extension.
paths = [
  'LICENSE',
  'README.md',
]
```

All you have to do is now run

```
build-blender-extension -m blender_manifest.toml
```

Note: if you don't specify any arguments, it will try to use `blender_manifest.toml`.

## Installing

You can also auto install the extension after building directly with this command.

```shell
bbext --install
```

If you choose to also generate builds for all the platforms, it will install the universal build.

This command will also attempt to disable the extension to make blender remove all the wheels. This is useful because blender doesn't refresh the wheels after installing, you have to disable then enable the extension in order to refresh.

Since this command disables the extension, you may want to also use `--enable` so you can keep the extension enabled every time you reinstall it.

> [!NOTE]
> When disabling extensions with wheels, blender may say something like this
>
>```
>Failed to remove: (<built-in function unlink>, '...\\Blender Foundation\\Blender\\4.3\\extensions\\.local\\lib\\python3.11\\site-packages\\PIL\\_imaging.cp311-win_amd64.pyd', (<class 'PermissionError'>, PermissionError(13, 'Access is denied'), <traceback object at 0x000001FF9ABB01C0>))
>```
>
> This doesn't really mean anything, and the package is indeed removed. The extension will work just fine on the next launch.

## Other arguments

There are many other options you can use.

```
usage: bbext [-h] [-m MANIFEST] [-d DIST] [-cp311] [-a] [--split-platforms]
             [--python PYTHON_VERSION] [-I] [-r REPO] [-e] [--no-prefs]

Build blender extension with dependencies

options:
  -h, --help            show this help message and exit
  -m MANIFEST, --manifest MANIFEST
                        path to blender manifest
  -d DIST, --dist DIST  override dist folder
  -cp311, --ensure-cp311
                        Renames any instance of "cp##" in wheels to "cp311" to make blender  
                        not ignore it. You won't have to use this with blender 4.3.1, but    
                        is an issue in 4.3.0 and 4.2.4 LTS.
  -a, --all-wheels      Download all wheels packages for all platforms. May result in large  
                        file sizes.
  --split-platforms     Build a separate package for each platform. Adding the platform as   
                        a file name suffix (before the extension). This can be useful to     
                        reduce the upload size of packages that bundle large platform-       
                        specific modules (``*.whl`` files).
  --python PYTHON_VERSION
                        Python version to use. Defaults to the python version the minimum    
                        blender version uses (most likely 3.11).

Install options:
  Options for installing. If --install is omitted, all of these will be ignored.

-I, --install         Install the extension.
  -r REPO, --repo REPO  The repository identifier.
  -e, --enable          Enable the extension after installation.
  --no-prefs            Treat the user-preferences as read-only, preventing updates for      
                        operations that would otherwise modify them. This means removing     
                        extensions or repositories for example, wont update the user-        
                        preferences.
```

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