Add support for third-party GUI framework plugins

.github/workflows/ci.yml

@@ -142,10 +142,27 @@ jobs:
         name: html-coverage-report-project
         path: htmlcov
 
+  verify-templates:
+    name: Verify Templates
+    needs: unit-tests
+    # !!!!! TODO:PR: use real repo !!!!!
+    # uses: beeware/.github/.github/workflows/app-create-verify.yml@main
+    uses: rmartin16/.github-beeware/.github/workflows/app-create-verify.yml@create-new-project
+    with:
+      runner-os: ${{ matrix.runner-os }}
+      framework: ${{ matrix.framework }}
+    strategy:
+      fail-fast: false
+      matrix:
+        framework: [ "toga", "pyside6", "ppb", "pygame" ]
+        runner-os: [ "macos-latest", "ubuntu-22.04", "windows-latest" ]
+
   verify-apps:
     name: Build app
     needs: unit-tests
-    uses: beeware/.github/.github/workflows/app-build-verify.yml@main
+    # !!!!! TODO:PR: use real repo !!!!!
+    # uses: beeware/.github/.github/workflows/app-build-verify.yml@main
+    uses: rmartin16/.github-beeware/.github/workflows/app-build-verify.yml@create-new-project
     with:
       # This *must* be the version of Python that is the system Python on the
       # Ubuntu version used to run Linux tests. We use a fixed ubuntu-22.04
@@ -158,10 +175,5 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        framework: [ "toga", "pyside2", "pyside6", "ppb", "pygame" ]
+        framework: [ "toga", "pyside6", "ppb", "pygame" ]
         runner-os: [ "macos-latest", "ubuntu-22.04", "windows-latest" ]
-        exclude:
-          # Pyside2 doesn't publish ARM64 wheels, and is unlikely to ever do so.
-          # This means we can't make a universal binary.
-          - framework: "pyside2"
-            runner-os: "macos-latest"

changes/1524.feature.rst

@@ -0,0 +1 @@
+Briefcase now supports GUI bootstrap plugins to customize how new projects are created.

setup.cfg

@@ -112,6 +112,11 @@ where = src
 [options.entry_points]
 console_scripts =
     briefcase = briefcase.__main__:main
+briefcase.bootstraps =
+    Toga = briefcase.bootstraps.toga:TogaGuiBootstrap
+    PySide6 = briefcase.bootstraps.pyside6:PySide6GuiBootstrap
+    PursuedPyBear = briefcase.bootstraps.pursuedpybear:PursuedPyBearGuiBootstrap
+    Pygame = briefcase.bootstraps.pygame:PygameGuiBootstrap
 briefcase.platforms =
     android = briefcase.platforms.android
     iOS = briefcase.platforms.iOS

src/briefcase/bootstraps/__init__.py

@@ -0,0 +1,5 @@
+from briefcase.bootstraps.base import BaseGuiBootstrap  # noqa: F401
+from briefcase.bootstraps.pursuedpybear import PursuedPyBearGuiBootstrap  # noqa: F401
+from briefcase.bootstraps.pygame import PygameGuiBootstrap  # noqa: F401
+from briefcase.bootstraps.pyside6 import PySide6GuiBootstrap  # noqa: F401
+from briefcase.bootstraps.toga import TogaGuiBootstrap  # noqa: F401

src/briefcase/bootstraps/base.py

@@ -0,0 +1,115 @@
+from __future__ import annotations
+
+from abc import ABC
+from typing import Any, TypedDict
+
+
+class AppContext(TypedDict):
+    formal_name: str
+    app_name: str
+    class_name: str
+    module_name: str
+    project_name: str
+    description: str
+    author: str
+    author_email: str
+    bundle: str
+    url: str
+    license: str
+    briefcase_version: str
+    template_source: str
+    template_branch: str
+
+
+class BaseGuiBootstrap(ABC):
+    """Definition for a plugin that defines a new Briefcase app."""
+
+    # These are the field names that will be defined in the cookiecutter context.
+    # Any fields defined here must be implemented as methods that return a ``str``
+    # or ``None``. Returning ``None`` omits the field as a key in the context, thereby
+    # deferring the value for the field to the cookiecutter template.
+    fields: list[str] = [
+        "app_source",
+        "app_start_source",
+        "pyproject_table_briefcase_extra_content",
+        "pyproject_table_briefcase_app_extra_content",
+        "pyproject_table_macOS",
+        "pyproject_table_linux",
+        "pyproject_table_linux_system_debian",
+        "pyproject_table_linux_system_rhel",
+        "pyproject_table_linux_system_suse",
+        "pyproject_table_linux_system_arch",
+        "pyproject_table_linux_appimage",
+        "pyproject_table_linux_flatpak",
+        "pyproject_table_windows",
+        "pyproject_table_iOS",
+        "pyproject_table_android",
+        "pyproject_table_web",
+        "pyproject_extra_content",
+    ]
+
+    # A short annotation that's appended to the name of the GUI toolkit when the user
+    # is presented with the options to create a new project.
+    display_name_annotation: str = ""
+
+    def __init__(self, context: AppContext):
+        # context contains metadata about the app being created
+        self.context = context
+
+    def extra_context(self) -> dict[str, Any] | None:
+        """Runs prior to other plugin hooks to provide additional context.
+
+        This can be used to prompt the user with additional questions or run arbitrary
+        logic to supplement the context provided to cookiecutter.
+        """
+
+    def app_source(self) -> str | None:
+        """The Python source code for app.py."""
+
+    def app_start_source(self) -> str | None:
+        """The Python source code for __main__.py to start the app."""
+
+    def pyproject_table_briefcase_extra_content(self) -> str | None:
+        """Additional content for ``tool.briefcase`` table."""
+
+    def pyproject_table_briefcase_app_extra_content(self) -> str | None:
+        """Additional content for ``tool.briefcase.app.<app-name>`` table."""
+
+    def pyproject_table_macOS(self) -> str | None:
+        """Content for ``tool.briefcase.app.<app-name>.macOS`` table."""
+
+    def pyproject_table_linux(self) -> str | None:
+        """Content for ``tool.briefcase.app.<app-name>.linux`` table."""
+
+    def pyproject_table_linux_system_debian(self) -> str | None:
+        """Content for ``tool.briefcase.app.<app-name>.linux.debian`` table."""
+
+    def pyproject_table_linux_system_rhel(self) -> str | None:
+        """Content for ``tool.briefcase.app.<app-name>.linux.rhel`` table."""
+
+    def pyproject_table_linux_system_suse(self) -> str | None:
+        """Content for ``tool.briefcase.app.<app-name>.linux.suse`` table."""
+
+    def pyproject_table_linux_system_arch(self) -> str | None:
+        """Content for ``tool.briefcase.app.<app-name>.linux.arch`` table."""
+
+    def pyproject_table_linux_appimage(self) -> str | None:
+        """Content for ``tool.briefcase.app.<app-name>.linux.appimage`` table."""
+
+    def pyproject_table_linux_flatpak(self) -> str | None:
+        """Content for ``tool.briefcase.app.<app-name>.linux.flatpak`` table."""
+
+    def pyproject_table_windows(self) -> str | None:
+        """Content for ``tool.briefcase.app.<app-name>.windows`` table."""
+
+    def pyproject_table_iOS(self) -> str | None:
+        """Content for ``tool.briefcase.app.<app-name>.iOS`` table."""
+
+    def pyproject_table_android(self) -> str | None:
+        """Content for ``tool.briefcase.app.<app-name>.android`` table."""
+
+    def pyproject_table_web(self) -> str | None:
+        """Content for ``tool.briefcase.app.<app-name>.web`` table."""
+
+    def pyproject_extra_content(self) -> str | None:
+        """Additional TOML to add to the bottom of pyproject.toml."""

src/briefcase/bootstraps/pursuedpybear.py

@@ -0,0 +1,159 @@
+from briefcase.bootstraps.base import BaseGuiBootstrap
+
+
+class PursuedPyBearGuiBootstrap(BaseGuiBootstrap):
+    display_name_annotation = "does not support iOS/Android deployment"
+
+    def app_source(self):
+        return """\
+import importlib.metadata
+import os
+import sys
+
+import ppb
+
+
+class {{ cookiecutter.class_name }}(ppb.Scene):
+    def __init__(self, **props):
+        super().__init__(**props)
+
+        self.add(
+            ppb.Sprite(
+                image=ppb.Image("{{ cookiecutter.module_name }}/resources/{{ cookiecutter.app_name }}.png"),
+            )
+        )
+
+
+def main():
+    # Linux desktop environments use app's .desktop file to integrate the app
+    # to their application menus. The .desktop file of this app will include
+    # StartupWMClass key, set to app's formal name, which helps associate
+    # app's windows to its menu item.
+    #
+    # For association to work any windows of the app must have WMCLASS
+    # property set to match the value set in app's desktop file. For PPB this
+    # is set using environment variable.
+
+    # Find the name of the module that was used to start the app
+    app_module = sys.modules["__main__"].__package__
+    # Retrieve the app's metadata
+    metadata = importlib.metadata.metadata(app_module)
+
+    os.environ["SDL_VIDEO_X11_WMCLASS"] = metadata["Formal-Name"]
+
+    ppb.run(
+        starting_scene={{ cookiecutter.class_name }},
+        title=metadata["Formal-Name"],
+    )
+"""
+
+    def pyproject_table_briefcase_app_extra_content(self):
+        return """
+
+requires = [
+    "ppb~=1.1",
+]
+test_requires = [
+{%- if cookiecutter.test_framework == "pytest" %}
+    "pytest",
+{%- endif %}
+]
+"""
+
+    def pyproject_table_macOS(self):
+        return """
+universal_build = true
+requires = [
+    "std-nslog~=1.0.0",
+]
+"""
+
+    def pyproject_table_linux(self):
+        return """
+requires = [
+]
+"""
+
+    def pyproject_table_linux_system_debian(self):
+        return """
+system_requires = [
+# ?? FIXME
+]
+
+system_runtime_requires = [
+# ?? FIXME
+]
+"""
+
+    def pyproject_table_linux_system_rhel(self):
+        return """
+system_requires = [
+# ?? FIXME
+]
+
+system_runtime_requires = [
+# ?? FIXME
+]
+"""
+
+    def pyproject_table_linux_system_suse(self):
+        return """
+system_requires = [
+# ?? FIXME
+]
+
+system_runtime_requires = [
+# ?? FIXME
+]
+"""
+
+    def pyproject_table_linux_system_arch(self):
+        return """
+system_requires = [
+# ?? FIXME
+]
+
+system_runtime_requires = [
+# ?? FIXME
+]
+"""
+
+    def pyproject_table_linux_appimage(self):
+        return """
+manylinux = "manylinux2014"
+
+system_requires = [
+# ?? FIXME
+]
+
+linuxdeploy_plugins = [
+]
+"""
+
+    def pyproject_table_linux_flatpak(self):
+        return """
+flatpak_runtime = "org.freedesktop.Platform"
+flatpak_runtime_version = "22.08"
+flatpak_sdk = "org.freedesktop.Sdk"
+"""
+
+    def pyproject_table_windows(self):
+        return """
+requires = [
+]
+"""
+
+    def pyproject_table_iOS(self):
+        return """
+supported = false
+"""
+
+    def pyproject_table_android(self):
+        return """
+supported = false
+"""
+
+    def pyproject_table_web(self):
+        return """
+supported = false
+"""