add script for extracting changelog from commit messages

scripts/generate_changelog.py

@@ -0,0 +1,44 @@
+#!/usr/bin/python3
+import pygit2
+import sys
+import re
+from collections import defaultdict
+
+repo = pygit2.Repository(".")
+
+until = repo.revparse_single(f'refs/tags/{sys.argv[1]}').id
+
+walker = repo.walk(repo.head.target)
+walker.simplify_first_parent()
+
+changelog_re = re.compile(r"changelog:\s+(.+?)/(.+?):\s+(.+?)(?:(?:\n\n)|$)", flags=re.DOTALL)
+
+lines = defaultdict(lambda: defaultdict(list))
+
+def fix_spelling(word) :
+    if word in ("Enhacements", "Enhnacements") :
+        return "Enhancements"
+    return word.title()
+
+for commit in walker :
+    if commit.id == until :
+        break
+    #print(commit.message)
+    m = changelog_re.findall(commit.message.strip())
+    for r in m :
+        cat, subcat, msg = r
+        msg = msg.replace("\n", " ")
+        line = f" - {msg} ({commit.id})"
+        lines[fix_spelling(cat)][fix_spelling(subcat)].append(line)
+
+for cat, subcats in lines.items() :
+    print("##", cat)
+    print()
+    for subcat, items in subcats.items() :
+        print("###", subcat)
+        print()
+        for item in items :
+            print(item)
+        print()
+    print()
+