Add automatic release information

.woodpecker.yml

@@ -20,7 +20,17 @@ pipeline:
       - python --version && poetry --version
       - poetry build
     when:
-      branch: main
+      event: tag
+      tag: v*
+
+  release_prep:
+    image: python
+    commands:
+      - echo "----------------- preparing release ------------------"
+      - python tools/extract-changelog.py
+    when:
+      event: tag
+      tag: v*
 
   gitea_release:
     image: plugins/gitea-release

tools/extract-changelog.py

@@ -0,0 +1,56 @@
+import re
+
+## Extracts the version and newest changes from a semantic changelog.
+#
+# Important, it only works with three-parted version numbers
+# a-la 1.2.3 or 313.01.1888 -- needs \d.\d.\d to work.
+#
+# The version number and changeset will be put in `NEWEST_VERSION.md`
+# and `NEWEST_CHANGES.md` respectively, for further use in releases.
+OUTPUT_FILE_VERSION = "NEWEST_VERSION.md"
+OUTPUT_FILE_CHANGES = "NEWEST_CHANGES.md"
+
+
+def getVersion(file):
+    for line in file:
+        m = re.match(r"^## \[(\d+\.\d+\.\d+)\]", line)
+        if m and m.group(1):
+            return m.group(1)
+
+
+def getSection(file):
+    inRecordingMode = False
+    for line in file:
+        if not inRecordingMode:
+            if re.match(r"^## \[\d+\.\d+\.\d+\]", line):
+                inRecordingMode = True
+        elif re.match(r"^## \[\d+\.\d+\.\d+\]", line):
+            inRecordingMode = False
+            break
+        elif re.match(r"^$", line):
+            pass
+        else:
+            yield line
+
+
+def toFile(fname, content):
+    file = open(fname, "w")
+    file.write(content)
+    file.close()
+
+
+with open("CHANGELOG.md") as file:
+    title = getVersion(file)
+    print(title)
+    toFile(OUTPUT_FILE_VERSION, title)
+
+with open("CHANGELOG.md") as file:
+    newest_changes_gen = getSection(file)
+    newest_changes = ""
+    for line in newest_changes_gen:
+        newest_changes += line
+    print("[Extracted Changelog]")
+    print(newest_changes)
+    toFile(OUTPUT_FILE_CHANGES, newest_changes)
+
+file.close()