Replace flake8 and isort with ruff.

.github/workflows/ci.yml

@@ -47,8 +47,8 @@ jobs:
     - name: Test with tox
       run: tox
 
-  verify-projects:
-    name: Verify project
+  verify-create:
+    name: Verify app creation
     needs: unit-tests
     uses: beeware/.github/.github/workflows/app-create-verify.yml@main
     with:
@@ -60,8 +60,8 @@ jobs:
         framework: [ "toga", "pyside6", "pygame", "console" ]
         runner-os: [ "macos-15", "ubuntu-latest", "windows-latest" ]
 
-  verify-apps:
-    name: Build app
+  verify-build:
+    name: Verify app build
     needs: unit-tests
     uses: beeware/.github/.github/workflows/app-build-verify.yml@main
     with:

.pre-commit-config.yaml

@@ -9,32 +9,22 @@ repos:
       - id: check-docstring-first
       - id: end-of-file-fixer
       - id: trailing-whitespace
-  - repo: https://github.com/PyCQA/isort
-    rev: 9.0.0b1
+  - repo: https://github.com/PyCQA/docformatter
+    rev: v1.7.7
     hooks:
-      - id: isort
-        additional_dependencies: [toml]
-  - repo: https://github.com/asottile/pyupgrade
-    rev: v3.21.2
+      - id: docformatter
+        args: [--in-place, --black]
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.15.22
     hooks:
-      - id: pyupgrade
-        args: [--py39-plus]
-  # Docformatter 1.7.5 isn't compatible with Pre-commit 4.0
-  # - repo: https://github.com/PyCQA/docformatter
-  #   rev: v1.7.5
-  #   hooks:
-  #     - id: docformatter
-  #       args: [--in-place, --black]
-  - repo: https://github.com/psf/black-pre-commit-mirror
-    rev: 26.5.1
+      - id: ruff-format
+      - id: ruff-check
+        args: [ --fix ]
+  - repo: https://github.com/rvben/rumdl-pre-commit
+    rev: v0.2.37
     hooks:
-      - id: black
-        language_version: python3
-  - repo: https://github.com/PyCQA/flake8
-    rev: 7.3.0
-    hooks:
-      - id: flake8
-        args: [--max-line-length=119]
+      - id: rumdl
+      - id: rumdl-fmt
   - repo: https://github.com/codespell-project/codespell
     rev: v2.4.3
     hooks:

README.md

@@ -1,33 +1,29 @@
 # Briefcase Bootstrap template
 
-A template for starting a Python app that will be deployed using
-Briefcase.
+A template for starting a Python app that will be deployed using Briefcase.
 
 ## Using this template
 
-In normal usage, you won't need to reference this template at all - it
-is used automatically by Briefcase when you run `briefcase new`.
+In normal usage, you won't need to reference this template at all - it is used automatically by Briefcase when you run `briefcase new`.
 
-If you are developing a modification to this template and want to test
-it, you can tell Briefcase to use your own template by passing in the
-`-t` option:
+If you are developing a modification to this template and want to test it, you can tell Briefcase to use your own template by passing in the `-t` option:
 
 ```sh
 briefcase new -t <path to checkout>
 ```
 
-Alternatively, if you want to test this template *without* using
-Briefcase, you can use
-[cookiecutter](http://github.com/cookiecutter/cookiecutter) directly.
+Alternatively, if you want to test this template *without* using Briefcase, you can use [cookiecutter](http://github.com/cookiecutter/cookiecutter) directly.
+
+1. Install [cookiecutter](http://github.com/cookiecutter/cookiecutter):
 
-1.  Install [cookiecutter](http://github.com/cookiecutter/cookiecutter):
     ```sh
     pip install cookiecutter
     ```
 
-2.  Run `cookiecutter` on this template:
+2. Run `cookiecutter` on this template:
+
     ```sh
     cookiecutter https://github.com/beeware/briefcase-template
     ```
 
-3.  Add your code to the project.
+3. Add your code to the project.

hooks/pre_gen_project.py

@@ -7,7 +7,7 @@
 app_name = "{{ cookiecutter.app_name }}"
 
 if not re.match(PEP508_NAME_RE, app_name):
-    print("ERROR: `%s` is not a valid Python package name!" % app_name)
+    print(f"ERROR: `{app_name}` is not a valid Python package name!")
 
     # exits with status 1 to indicate failure
     sys.exit(1)

pyproject.toml

@@ -1,3 +1,8 @@
+[project]
+name = "briefcase-template"
+version = "1.0.0"
+requires_python = ">=3.10"
+
 [dependency-groups]
 briefcase = [
     "briefcase @ git+https://github.com/beeware/briefcase",  # provides cookiecutter
@@ -6,15 +11,18 @@ pre-commit = [
     "pre-commit == 4.6.0",
 ]
 tox = [
-    "tox == 4.56.4",
+    "tox-uv == 1.35.2",
 ]
 verify = [
     "toml == 0.10.2",
+    "ruff == 0.16.0",
+    # Legacy; needed until we clean up .github
     "flake8 == 7.3.0",
 ]
 create-verify = [
-    "black == 26.5.1",
     {include-group = "verify"},
+    # Legacy; needed until we clean up .github
+    "black == 26.5.1",
 ]
 test = [
     "pytest == 9.1.1",
@@ -27,3 +35,58 @@ dev = [
     {include-group = "tox"},
     {include-group = "test"},
 ]
+
+
+[tool.ruff.lint]
+# In addition to the default rules, these additional rules will be used:
+extend-select = [
+    "E",      # pycodestyle
+    "W",      # pycodestyle
+    "F",      # pyflakes
+    "UP",     # pyupgrade
+    "B",      # flake8-bugbear
+    "YTT",    # flake8-2020
+    "ASYNC",  # flake8-async
+    "C4",     # flake8-comprehensions
+    "I",      # isort
+    "RUF",    # ruff-specific rules
+    "PT",     # flake8-pytest-style
+    "FURB",   # refurb
+    "ISC",    # flake8-implicit-str-concat
+    "PGH",    # pygrep-hooks
+    "PIE",    # flake8-pie
+    "SIM",    # flake8-simplify
+]
+
+ignore = [
+    "SIM105",  # use `contextlib.suppress` (too opinionated)
+    "SIM108",  # replace if-else with ternary operator (too opinionated)
+]
+
+[tool.rumdl]
+flavor = "mkdocs"
+include = ["**/*.md"]
+exclude = ["CODE_OF_CONDUCT.md"]
+respect-gitignore = true
+force-exclude = true
+
+# Disable rules:
+# MD013: Line length - flagging on mkdocstrings content
+# MD014: Forces commands in codeblocks to show output
+# MD042: Empty link - buggy, still flagging on valid MkDocs formatting
+# MD052: Reference link not found - buggy, flagging on valis MkDocs links
+disable = ["MD014", "MD042", "MD052"]
+
+[tool.rumdl.MD013]  # Line length
+line_length = 999999  # Force reflow to paragraph content to remove linebreaks
+reflow = true
+reflow_mode = "normalize"
+
+[tool.rumdl.MD026]  # Remove punctuation at the end of headings
+punctuation = ",;:"
+
+[tool.rumdl.MD033]  # No inline HTML
+allowed_elements = ["nospell",]  # pyspelling inline disable tag
+
+[tool.rumdl.MD046]
+style = "fenced"