Add CI job to measure preprocessed code size

scripts/preprocessed_file_size_stats_diff.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+
+import click
+import json
+import termtables
+
+
+@click.command()
+@click.argument('first', type=click.Path(exists=True))
+@click.argument('second', type=click.Path(exists=True))
+def main(first, second):
+    stats = tuple(read_stats(v) for v in (first, second))
+    keys = set()
+    for v in stats:
+        keys.update(v.keys())
+    keys = sorted(keys - {'total'})
+
+    result = list()
+    for k in keys:
+        first_size = stats[0].get(k, 0)
+        second_size = stats[1].get(k, 0)
+        diff = second_size - first_size
+        if diff != 0:
+            result.append((k, first_size, diff, (second_size / first_size - 1) * 100 if first_size != 0 else 100))
+
+    result.sort(key=lambda v: tuple(reversed(v)))
+
+    diff = stats[1]['total'] - stats[0]['total']
+    first_total = stats[0]['total']
+    result.append(('total', first_total, diff, (stats[1]['total'] / first_total - 1) * 100) if first_total != 0 else 100)
+
+    print(f'Preprocessed code size diff between {first} and {second}:\n')
+
+    termtables.print(
+        [(v[0], v[1], f'{v[2]:+}', f'{v[3]:+}') for v in result],
+        header=['file', 'size, bytes', 'diff, bytes', 'diff, %'],
+        style=termtables.styles.markdown,
+    )
+
+
+def read_stats(path):
+    with open(path) as stream:
+        return json.load(stream)
+
+if __name__ == '__main__':
+    main()