Add a script to generate changelog

diff --git a/extra/release/changelog.py b/extra/release/changelog.py
new file mode 100755 (executable)
index 0000000..aec2af1
--- /dev/null
+++ b/extra/release/changelog.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+
+import git
+import argparse
+import re
+
+def parse_opts():
+    p = argparse.ArgumentParser()
+    p.add_argument('--git-root', default='.')
+    p.add_argument('--no-squash-merge-childs', action='store_true')
+    p.add_argument('--abbrev', default=8, type=int)
+    # git config pretty.le
+    p.add_argument('--format', default='  o %(s)s (%(h)s %(aN)s)')
+    p.add_argument('--revision-range')
+    return p.parse_args()
+
+def main():
+    opts = parse_opts()
+    repo = git.Repo(opts.git_root)
+    squash = not opts.no_squash_merge_childs
+
+    ignore = []
+
+    revision_range = opts.revision_range
+    if not revision_range:
+        revision_range = repo.git.describe('--abbrev=0') + '..'
+
+    for commit in repo.iter_commits(revision_range):
+        if squash:
+            if commit.hexsha in ignore:
+                continue
+            if len(commit.parents) > 1:
+                for c in repo.iter_commits('{}..{}'.format(*commit.parents)):
+                    ignore.append(c.hexsha)
+        print(opts.format % {
+            's': commit.summary,
+            'h': commit.hexsha[:opts.abbrev],
+            'aN': str(commit.author),
+        })
+
+
+if __name__ == "__main__":
+    main()