Add script to generate changelogs

diff --git a/build-scripts/changelog-from-pr.py b/build-scripts/changelog-from-pr.py
new file mode 100755 (executable)
index 0000000..6b96d49
--- /dev/null
+++ b/build-scripts/changelog-from-pr.py
@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+
+import requests
+import sys
+import argparse
+import re
+
+argp = argparse.ArgumentParser()
+argp.add_argument('--oneline', action='store_true',
+                  help='Make one-lined changelog entries (for 4.0 and older)')
+argp.add_argument('pullrequest', metavar='PULL_REQUEST', nargs='+',
+                  help='Make changelogs for these Pull Request #\'s')
+arguments = argp.parse_args()
+
+ticket_regex = re.compile(r'(?:[Cc]loses|[Ff]ixes)? #(\d+)')
+
+out = ''
+for pr in arguments.pullrequest:
+    if pr[0] == '#':
+        pr = pr[1:]
+    try:
+        res = requests.get('https://api.github.com/repos/PowerDNS/pdns/pulls/'
+                           '{}'.format(pr))
+        pr_info = res.json()
+    except (requests.exceptions.HTTPError, ValueError) as e:
+        print(e)
+        sys.exit(1)
+
+    if arguments.oneline:
+        out += '- `#{pr} <{url}>`__: {title}'.format(
+            pr=pr, url=pr_info['html_url'], title=pr_info['title']
+        )
+    else:
+        out += '  .. change::\n' + \
+               '  :tags: XXXXXX\n' + \
+               '  :pullreq: {}\n'.format(pr)
+        tickets = re.findall(ticket_regex, pr_info['body'])
+        if len(tickets):
+            out += '  :tickets: {}\n'.format(', '.join(tickets))
+        out += '\n  {}'.format(pr_info['title'].capitalize())
+
+    if pr_info['user']['login'].lower() not in ['ahupowerdns', 'habbie',
+                                                'pieterlexis', 'rgacogne',
+                                                'aerique']:
+        try:
+            user_info = requests.get(pr_info['user']['url']).json()
+        except (requests.exceptions.HTTPError, ValueError) as e:
+            print(e)
+            sys.exit(1)
+        out += ' ({})'.format(user_info['name'])
+    out += '\n'
+
+    if not arguments.oneline:
+        out += '\n'
+
+print(out)