meson: Define gst_plugins with list of dependencies

This is needed to link gst-full with Rust plugins. The script requires
either python11 or the tomli module.

1 files changed, 56 insertions, 0 deletions

diff --git a/dependencies.py b/dependencies.py
new file mode 100755
index 000000000..85fa04cf4
--- /dev/null
+++ b/dependencies.py
@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+
+# Parse Cargo.toml files for each plugin to collect their external dependencies.
+# Meson will lookup those dependencies using pkg-config to be able to link
+# static Rust plugins into gst-full.
+
+from argparse import ArgumentParser
+from pathlib import Path
+
+try:
+    # Python11 stdlib
+    import tomllib
+except ImportError:
+    import tomli as tomllib
+
+
+PARSER = ArgumentParser()
+PARSER.add_argument('src_dir', type=Path)
+PARSER.add_argument('plugins', nargs='*')
+
+
+# Map plugin name to directory name, for those that does not match.
+RENAMES = {
+    'rsaudiofx': 'audiofx',
+    'rsfile': 'file',
+    'rsflv': 'flavors',
+    'rstextwrap': 'wrap',
+    'rsjson': 'json',
+    'rsregex': 'regex',
+    'rswebp': 'webp',
+    'textahead': 'ahead',
+    'rsonvif': 'onvif',
+    'rstracers': 'tracers',
+    'rsclosedcaption': 'closedcaption',
+    'rsdav1d': 'dav1d',
+}
+
+
+if __name__ == "__main__":
+    opts = PARSER.parse_args()
+
+    deps = set()
+    for p in opts.plugins:
+        assert p.startswith('gst')
+        name = p[3:]
+        name = RENAMES.get(name, name)
+        files = list(opts.src_dir.glob(f'**/{name}/Cargo.toml'))
+        assert len(files) == 1
+        with files[0].open('rb') as f:
+            data = tomllib.load(f)
+            try:
+                requires = data['package']['metadata']['capi']['pkg_config']['requires_private']
+            except KeyError:
+                continue
+            deps.update([i.strip() for i in requires.split(',')])
+    print(','.join(deps))