Implement Python formatting with black

Makefile

@@ -12,6 +12,8 @@ lint:
 	flatpak run --user --command=/usr/lib/sdk/node18/bin/node --filesystem=host:ro org.gnome.Sdk//45 node_modules/.bin/eslint --max-warnings=0 src
 # rustfmt
 	flatpak run --user --command=/usr/lib/sdk/rust-stable/bin/rustfmt --filesystem=host:ro org.gnome.Sdk//45 --check --edition 2021 src/**/*.rs
+# black
+	./black.sh --check src/**/*.py
 # gettext
 	find po/ -type f -name "*po" -print0 | xargs -0 -n1 msgfmt -o /dev/null --check
 # Flatpak manifests

black.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+# This is a small wrapper around black - the Python code formatter.
+# The script will setup and activate a virtual env in .venv if black is not
+# found in PATH.
+#
+# Still requires Python 3.
+set -e
+
+if ! which black &>/dev/null; then
+  if [ ! -d ".venv" ]; then
+    echo "Note: black was not found on your system. A virtualenv is created in .venv."
+    python3 -m venv .venv
+  fi
+  source .venv/bin/activate
+  if ! which black &>/dev/null; then
+    pip3 install black
+  fi
+fi
+
+exec black "$@"

build-aux/README.md

@@ -0,0 +1,27 @@
+# Build Utilities
+
+This directory contains the Flatpak Manifest and other build utilities.
+
+## Workbench Flatpak Manifests
+
+### Python Black Dependency
+
+`modules/python-black.json` contains the Flatpak modules to install [https://github.com/psf/black](black), the
+uncompromising Python code formatter.
+
+This file is partially auto-generated. Here is how to generate it:
+
+1. Obtain an up-to-date copy of [flatpak-builder-tools](https://github.com/flatpak/flatpak-builder-tools).
+2. Make sure you have a Python virtualenv activated with the dependencies for the `pip` generator from the repo above.
+3. Run `python3 <...>/flatpak-builder-tools/pip/flatpak-pip-generator black -o modules/python-black --build-isolation`
+
+You will notice that Workbench will now not build. This is due to these issues:
+
+- https://github.com/flatpak/flatpak-builder-tools/issues/380
+- https://github.com/pypa/pip/issues/7863
+
+This means that the generated JSON file now needs its build dependencies manually added. Check the build dependencies
+of black and their dependencies and add them to the JSON as well. Brute-forcing the build to obtain missing packages
+may help as does referencing old commits of the file. You can also use the generator command to generate dependencies
+for them and then merge it into the file by hand, but note that you will also need to manually collect their build
+dependencies too.

build-aux/modules/python-black.json

@@ -0,0 +1,104 @@
+{
+  "name": "python3-black",
+  "buildsystem": "simple",
+  "build-commands": [
+    "pip3 install --verbose --exists-action=i --no-index --find-links=\"file://${PWD}\" --prefix=${FLATPAK_DEST} \"black\""
+  ],
+  "sources": [
+    {
+      "type": "file",
+      "url": "https://files.pythonhosted.org/packages/36/bf/a462f36723824c60dc3db10528c95656755964279a6a5c287b4f9fd0fa84/black-23.10.1.tar.gz",
+      "sha256": "1f8ce316753428ff68749c65a5f7844631aa18c8679dfd3ca9dc1a289979c258"
+    },
+    {
+      "type": "file",
+      "url": "https://files.pythonhosted.org/packages/00/2e/d53fa4befbf2cfa713304affc7ca780ce4fc1fd8710527771b58311a3229/click-8.1.7-py3-none-any.whl",
+      "sha256": "ae74fb96c20a0277a1d615f1e4d73c8414f5a98db8b799a7931d1582f3390c28"
+    },
+    {
+      "type": "file",
+      "url": "https://files.pythonhosted.org/packages/2a/e2/5d3f6ada4297caebe1a2add3b126fe800c96f56dbe5d1988a2cbe0b267aa/mypy_extensions-1.0.0-py3-none-any.whl",
+      "sha256": "4392f6c0eb8a5668a69e23d168ffa70f0be9ccfd32b5cc2d26a34ae5b844552d"
+    },
+    {
+      "type": "file",
+      "url": "https://files.pythonhosted.org/packages/ec/1a/610693ac4ee14fcdf2d9bf3c493370e4f2ef7ae2e19217d7a237ff42367d/packaging-23.2-py3-none-any.whl",
+      "sha256": "8c491190033a9af7e1d931d0b5dacc2ef47509b34dd0de67ed209b5203fc88c7"
+    },
+    {
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+      "url": "https://files.pythonhosted.org/packages/b4/2a/9b1be29146139ef459188f5e420a66e835dda921208db600b7037093891f/pathspec-0.11.2-py3-none-any.whl",
+      "sha256": "1d6ed233af05e679efb96b1851550ea95bbb64b7c490b0f5aa52996c11e92a20"
+    },
+    {
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+      "url": "https://files.pythonhosted.org/packages/56/29/3ec311dc18804409ecf0d2b09caa976f3ae6215559306b5b530004e11156/platformdirs-3.11.0-py3-none-any.whl",
+      "sha256": "e9d171d00af68be50e9202731309c4e658fd8bc76f55c11c7dd760d023bda68e"
+    },
+    {
+      "type": "file",
+      "url": "https://files.pythonhosted.org/packages/6b/be/0f2f4a5e8adc114a02b63d92bf8edbfa24db6fc602fca83c885af2479e0e/editables-0.5-py3-none-any.whl",
+      "sha256": "61e5ffa82629e0d8bfe09bc44a07db3c1ab8ed1ce78a6980732870f19b5e7d4c"
+    },
+    {
+      "type": "file",
+      "url": "https://files.pythonhosted.org/packages/76/56/8ccca673e2c896931722f876bf040c0b6a7d8c1a128be60516a8a55bb27a/hatchling-1.18.0-py3-none-any.whl",
+      "sha256": "b66dc254931ec42aa68b5febd1d342c58142cc5267b7ff3b12ba3fa5b4900c93"
+    },
+    {
+      "type": "file",
+      "url": "https://files.pythonhosted.org/packages/ec/1a/610693ac4ee14fcdf2d9bf3c493370e4f2ef7ae2e19217d7a237ff42367d/packaging-23.2-py3-none-any.whl",
+      "sha256": "8c491190033a9af7e1d931d0b5dacc2ef47509b34dd0de67ed209b5203fc88c7"
+    },
+    {
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+      "url": "https://files.pythonhosted.org/packages/b4/2a/9b1be29146139ef459188f5e420a66e835dda921208db600b7037093891f/pathspec-0.11.2-py3-none-any.whl",
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+    },
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+      "url": "https://files.pythonhosted.org/packages/05/b8/42ed91898d4784546c5f06c60506400548db3f7a4b3fb441cba4e5c17952/pluggy-1.3.0-py3-none-any.whl",
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+    },
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+    },
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+      "url": "https://files.pythonhosted.org/packages/00/b1/90cc7881c2e870333eeafa6afb7b27de53418aad1ba5409ad331c96608a1/hatch_vcs-0.3.0-py3-none-any.whl",
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+    },
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+      "url": "https://files.pythonhosted.org/packages/0e/a3/b9a8b0adfe672bf0df5901707aa929d30a97ee390ba651910186776746d2/setuptools_scm-8.0.4-py3-none-any.whl",
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+      "url": "https://files.pythonhosted.org/packages/24/21/7d397a4b7934ff4028987914ac1044d3b7d52712f30e2ac7a2ae5bc86dd0/typing_extensions-4.8.0-py3-none-any.whl",
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+    },
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+      "url": "https://files.pythonhosted.org/packages/c4/e6/c1ac50fe3eebb38a155155711e6e864e254ce4b6e17fe2429b4c4d5b9e80/flit_core-3.9.0.tar.gz",
+      "sha256": "72ad266176c4a3fcfab5f2930d76896059851240570ce9a98733b658cb786eba"
+    }
+  ]
+}

build-aux/re.sonny.Workbench.Devel.json

@@ -45,6 +45,7 @@
     "modules/blueprint-compiler.json",
     "modules/biome.json",
     "modules/icon-development-kit.json",
+    "modules/python-black.json",
     {
       "name": "Workbench",
       "buildsystem": "meson",

build-aux/re.sonny.Workbench.json

@@ -45,6 +45,7 @@
     "modules/blueprint-compiler.json",
     "modules/biome.json",
     "modules/icon-development-kit.json",
+    "modules/python-black.json",
     {
       "name": "Workbench",
       "buildsystem": "meson",

package.json

@@ -27,6 +27,7 @@
   "lint-staged": {
     "*.{css,json,md,yaml,yml}": "prettier --write",
     "*.{js,cjs,mjs}": "eslint --fix",
+    "*.py": "./black.sh",
     "*.rs": "flatpak run --user --command=/usr/lib/sdk/rust-stable/bin/rustfmt --filesystem=host org.gnome.Sdk//45 --edition 2021"
   }
 }

src/Library/demos/Welcome/main.py

@@ -7,10 +7,7 @@
 
 
 def greet(_widget):
-    dialog = Adw.MessageDialog(
-        body="Hello World!",
-        transient_for=workbench.window
-    )
+    dialog = Adw.MessageDialog(body="Hello World!", transient_for=workbench.window)
 
     dialog.add_response("ok", "Ok")
     dialog.connect("response", dialog_response)
@@ -24,11 +21,7 @@ def dialog_response(dialog: Adw.MessageDialog, response: str):
 
 subtitle_box: Gtk.Box = workbench.builder.get_object("subtitle")
 
-button = Gtk.Button(
-    label="Press me",
-    margin_top=6,
-    css_classes=["suggested-action"]
-)
+button = Gtk.Button(label="Press me", margin_top=6, css_classes=["suggested-action"])
 button.connect("clicked", greet)
 
 subtitle_box.append(button)

src/langs/python/python-previewer.py

@@ -22,7 +22,7 @@
 gi.require_version("Gtk", "4.0")
 gi.require_version("Adw", "1")
 gi.require_version("Graphene", "1.0")
-gi.require_version('Gsk', '4.0')
+gi.require_version("Gsk", "4.0")
 
 from gi.repository import GLib, Gdk, Gtk, Adw, Graphene, Gio, Gsk
 from gi.repository.Gio import DBusConnection, DBusConnectionFlags

src/window.js

@@ -242,6 +242,25 @@ export default function Window({ application, session }) {
     return stdout;
   }
 
+  function formatPythonCode(text) {
+    const blackLauncher = Gio.SubprocessLauncher.new(
+      Gio.SubprocessFlags.STDIN_PIPE |
+        Gio.SubprocessFlags.STDOUT_PIPE |
+        Gio.SubprocessFlags.STDERR_PIPE,
+    );
+
+    const blackProcess = blackLauncher.spawnv(["black", "--quiet", "-"]);
+
+    const [success, stdout, stderr] = blackProcess.communicate_utf8(text, null);
+
+    if (!success || stderr !== "") {
+      console.error(`Error running black: ${stderr}`);
+      return text;
+    }
+
+    return stdout;
+  }
+
   async function formatCode() {
     if (panel_code.panel.visible) {
       if (panel_code.language === "JavaScript") {
@@ -255,6 +274,10 @@ export default function Window({ application, session }) {
         await format(langs.rust.document.code_view, (text) => {
           return formatRustCode(text);
         });
+      } else if (panel_code.language === "Python") {
+        await format(langs.python.document.code_view, (text) => {
+          return formatPythonCode(text);
+        });
       }
     }