docs: Add a test to validate URLs in markdown/Users.md

Avoid piling up dead URLs.

.github/workflows/website.yml

@@ -45,7 +45,7 @@ jobs:
       - name: Install package
         run: |
           sudo apt-get -y install python3-pip ninja-build libjson-glib-dev
-          pip install hotdoc chevron strictyaml
+          pip install hotdoc chevron strictyaml aiohttp
 
       - uses: actions/cache/save@v4
         with:

docs/meson.build

@@ -1,7 +1,7 @@
 project('Meson documentation', version: '1.0')
 
 yaml_modname = get_option('unsafe_yaml') ? 'yaml' : 'strictyaml'
-py = import('python').find_installation('python3', modules: [yaml_modname], required: false)
+py = import('python').find_installation('python3', modules: [yaml_modname, 'aiohttp'], required: false)
 if not py.found()
     error(f'Cannot build documentation without yaml support')
 endif
@@ -145,3 +145,5 @@ run_target('upload',
     ],
     depends: documentation,
 )
+
+test('validate_links', find_program('./validatelinks.py'), args: meson.current_source_dir() / 'markdown' / 'Users.md')

docs/validatelinks.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+
+# SPDX-License-Identifier: Apache-2.0
+# Copyright 2025 The Meson development team
+
+import sys
+import re
+import aiohttp
+import asyncio
+
+LINK = re.compile(r'\[(?P<name>[A-Za-z0-9 ]+)\]\((?P<url>.*?)\)')
+
+
+async def fetch(session, name, url, timeout):
+    try:
+        async with session.get(url, timeout=timeout) as r:
+            if not r.ok:
+                return (name, url, r.status)
+    except Exception as e:
+        return (name, url, str(e))
+
+
+async def main(filename):
+    with open(filename) as f:
+        text = f.read()
+        timeout = aiohttp.ClientTimeout(total=60)
+        async with aiohttp.ClientSession() as session:
+            tasks = []
+            for link in LINK.finditer(text):
+                name, url = link.groups()
+                task = asyncio.ensure_future(fetch(session, name, url, timeout))
+                tasks.append(task)
+            responses = asyncio.gather(*tasks)
+            errors = [r for r in await responses if r is not None]
+        for name, url, result in errors:
+            print(f'"{name}" {url} {result}')
+        if errors:
+            sys.exit(1)
+
+
+if __name__ == '__main__':
+    asyncio.run(main(sys.argv[1]))