Use meson instead of setup.py

This project will usually be used as a subproject, so it needs a meson
file, and I'd like to not support two different buildsystems.

.gitignore

@@ -2,3 +2,4 @@ __pycache__
 /build
 /dist
 *.egg-info
+gtk-blueprint-tool.pc

.gitlab-ci.yml

@@ -1,5 +1,7 @@
 test:
   script:
-    - dnf install -y python3-pip
-    - python3 -m unittest
-    - pip3 install --user .
+    - dnf install -y meson
+    - meson _build
+    - ninja -C _build
+    - ninja -C _build test
+    - ninja -C _build install

gtk-blueprint-tool.pc

@@ -1,3 +0,0 @@
-Name: gtk-blueprint-tool
-Description: Markup compiler for GTK user interface definitions
-Version: 2021.1

meson.build

@@ -0,0 +1,24 @@
+project('gtk-blueprint-tool',
+  version: '0.1.0',
+)
+
+prefix = get_option('prefix')
+libdir = join_paths(prefix, get_option('libdir'))
+
+py = import('python').find_installation('python3')
+
+configure_file(
+  input: 'gtk-blueprint-tool.pc.in',
+  output: 'gtk-blueprint-tool.pc',
+  configuration: { 'VERSION': meson.project_version() },
+  install: not meson.is_subproject(),
+  install_dir: join_paths(libdir, 'pkgconfig'),
+)
+
+meson.override_find_program('gtk-blueprint-tool', find_program('gtk-blueprint-tool.py'))
+
+if not meson.is_subproject()
+  install_subdir('gtkblueprinttool', install_dir: py.get_install_dir())
+endif
+
+test('tests', py, args: ['-m', 'unittest'])

setup.py

@@ -1,61 +0,0 @@
-# SPDX-FileCopyrightText: 2021 GNOME Foundation
-# SPDX-License-Identifier: Apache-2.0 OR GPL-3.0-or-later
-
-# Adapted from the gi-docgen source code by James Westman <james@jwestman.net>
-
-import sys
-
-from gtkblueprinttool import main
-
-from distutils.command.build_py import build_py as _build_py
-from setuptools import setup
-
-
-class BuildCommand(_build_py):
-
-    def generate_pkgconfig_file(self):
-        lines = []
-        with open('gtk-blueprint-tool.pc.in', 'r') as f:
-            for line in f.readlines():
-                new_line = line.strip().replace('@VERSION@', main.VERSION)
-                lines.append(new_line)
-        with open('gtk-blueprint-tool.pc', 'w') as f:
-            f.write('\n'.join(lines))
-
-    def run(self):
-        self.generate_pkgconfig_file()
-        return super().run()
-
-
-def readme_md():
-    '''Return the contents of the README.md file'''
-    return open('README.md').read()
-
-
-entries = {
-    'console_scripts': ['gtk-blueprint-tool=gtkblueprinttool.main:main'],
-}
-
-packages = [
-    'gtkblueprinttool',
-]
-
-data_files = [
-    ('share/pkgconfig', ['gtk-blueprint-tool.pc']),
-]
-
-if __name__ == '__main__':
-    setup(
-        cmdclass={
-            'build_py': BuildCommand,
-        },
-        name='gtk-blueprint-tool',
-        version=main.VERSION,
-        license='GPL-3.0-or-later',
-        long_description=readme_md(),
-        long_description_content_type='text/markdown',
-        include_package_data=True,
-        packages=packages,
-        entry_points=entries,
-        data_files=data_files,
-    )