changelog.py: Adjust categories and labels: Enhancement, Bug, ITL, Documentation, Support

This PR allows to adjust the categories and matching labels. If no label
matches, "Support" is the old hardcoded default.

Issues with the "Documentation" and "ITL" label will be put into their
respective category at the bottom before "Support". This increases readability
and allows users to focus on the core vs additional config and docs.

"Support" also applies to labels such as "code-quality", "Tests" and "Packages"/"Installation".

Note: Labels are case sensitive. The order of the categories dictionary is
important too.

Since issues and PRs are the same for GitHub, and we don't require an issue
for a PR anymore, we sometimes have duplicates. This patch adds an inline
label called "PR" to highlight these PRs in the Changelog.

refs #5989

changelog.py

@@ -8,6 +8,10 @@ import sys
 import os
 from datetime import datetime
 from collections import defaultdict
+from collections import OrderedDict
+
+#################################
+## Env Config
 
 try:
     github_auth_username = os.environ['ICINGA_GITHUB_AUTH_USERNAME']
@@ -27,10 +31,34 @@ except:
     print "ERROR: Environment variable 'ICINGA_GITHUB_PROJECT' is not set."
     sys.exit(1)
 
+#################################
+## Config
+
 changelog_file = "CHANGELOG.md" # TODO: config param
 debug = 1
 
-ignored_labels = ["high", "low", "bug", "enhancement", "feedback", "question", "backported"]
+# Keep this in sync with GitHub labels.
+ignored_labels = [
+    "high-priority", "low-priority",
+    "bug", "enhancement",
+    "needs-feedback", "question", "duplicate", "invalid", "wontfix",
+    "backported", "build-fix"
+]
+
+# Selectively show and collect specific categories
+#
+# (category, list of case sensitive matching labels)
+# The order is important!
+# Keep this in sync with GitHub labels.
+categories = OrderedDict(
+[
+    ("Enhancement", ["enhancement"]),
+    ("Bug", ["bug", "crash"]),
+    ("ITL", ["ITL"]),
+    ("Documentation", ["Documentation"]),
+    ("Support", ["code-quality", "Tests", "Packages", "Installation"])
+]
+)
 
 #################################
 ## Helpers
@@ -74,12 +102,17 @@ def fetch_github_resources(uri, params = {}):
     return resources
 
 def issue_type(issue):
-    if "bug" in [label["name"] for label in issue["labels"]]:
-        return "Bug"
-    elif "enhancement" in [label["name"] for label in issue["labels"]]:
-        return "Enhancement"
-    else:
-        return "Support"
+    issue_labels = [label["name"] for label in issue["labels"]]
+
+    # start with the least important first (e.g. "Support", "Documentation", "Bug", "Enhancement" as order)
+    for category in reversed(categories):
+        labels = categories[category]
+
+        for label in labels:
+            if label in issue_labels:
+                return category
+
+    return "Support"
 
 def escape_markdown(text):
     #tmp = text.replace('&', '&amp;').replace('<', '&lt;').replace('>', '&gt;')
@@ -91,6 +124,10 @@ def escape_markdown(text):
 def format_labels(issue):
     labels = filter(lambda label: label not in ignored_labels, [label["name"] for label in issue["labels"]])
 
+    # Mark PRs as custom label
+    if "pull_request" in issue:
+        labels.append("PR")
+
     if len(labels):
         return " (" + ", ".join(labels) + ")"
     else:
@@ -175,7 +212,7 @@ for milestone in sorted(milestones.values(), key=lambda ms: (ms["due_on"], ms["t
     if len(ms_description) > 0:
         write_changelog("### Notes\n\n" + ms_description + "\n") # Don't escape anything, we take care on Github for valid Markdown
 
-    for category in ["Enhancement", "Bug", "Support"]:
+    for category, labels in categories.iteritems():
         try:
             ms_issues = issues[milestone["title"]][category]
         except KeyError: