meson: Fix Python module build

python/meson.build

@@ -3,20 +3,57 @@ pymod = import('python')
 py = pymod.find_installation('python3', required: false)
 
 if py.found() == true
-    r = run_command(py, 'generator.py', meson.current_source_dir(), check: true)
+    message('Installing python modules to', py.get_install_dir())
 
-    libxml2mod_src = ['libxml.c', 'libxml2-py.c', 'types.c']
+    pygenerated = custom_target(
+        'Python generated files',
+        input: files('generator.py'),
+        depend_files: files(
+            '..' / 'doc' / 'libxml2-api.xml',
+            'libxml2-python-api.xml',
+        ),
+        output: [
+            'libxml2-py.h',
+            'libxml2-export.c',
+            'libxml2-py.c',
+            'libxml2class.py',
+            'libxml2class.txt',
+        ],
+        command: [py, '@INPUT@', meson.current_build_dir()],
+    )
+    pygenerated_dep = declare_dependency(
+        sources : [pygenerated[0]],
+    )
 
-    message(py.get_install_dir())
+    libxml2_py = custom_target(
+        'libxml2.py',
+        input: [files('libxml.py'), pygenerated[3]],
+        output: 'libxml2.py',
+        command: [find_program('cat'), '@INPUT@'],
+        capture: true,
+        install: true,
+        install_dir: py.get_install_dir(),
+    )
+
+    libxml2mod_src = [
+        files('libxml.c', 'types.c'),
+        pygenerated[2],
+    ]
 
     py.extension_module(
         'libxml2mod',
-        files(libxml2mod_src),
-        dependencies: [py.dependency(), xml_dep],
-        include_directories: [config_dir],
+        libxml2mod_src,
+        dependencies: [
+            py.dependency(),
+            xml_dep,
+            pygenerated_dep,
+        ],
+        include_directories: [config_dir, '.'],
         install: true,
     )
 
+    py.install_sources(files('drv_libxml2.py'))
+
     setup_py = configuration_data()
     setup_py.set('prefix', get_option('prefix'))
     setup_py.set('LIBXML_VERSION', meson.project_version())