WIP show changelog since last devbuild in embed

codeblock text is too big, looks ugly in discord embed
also fields and embed content are limited length
needs some other way to highligght added/removed lines

.github/workflow_data/devbuild.py

@@ -1,14 +1,76 @@
 #!/usr/bin/env python
 import datetime as dt
+import subprocess
 import requests
 import json
+import re
 import os
 
 artifact_tgz = f"{os.environ['INDEXER_URL']}/firmware/dev/{os.environ['ARTIFACT_TAG']}.tgz"
 artifact_sdk = f"{os.environ['INDEXER_URL']}/firmware/dev/{os.environ['ARTIFACT_TAG'].replace('update', 'sdk')}.zip"
 artifact_lab = f"https://lab.flipper.net/?url={artifact_tgz}&channel=dev-cfw&version={os.environ['VERSION_TAG']}"
 
 
+def parse_diff(diff: str):
+    lines = diff.splitlines()[5:]
+    parsed = {}
+    previndent = ""
+    prevtext = ""
+    categories = []
+
+    for line in lines:
+        text = line[1:]
+        if not text.strip():
+            continue
+
+        indent = re.match("^[-# ]+", text)
+        if not indent:
+            continue
+        indent = indent[0].rstrip()
+        if indent.startswith("#"):
+            categories = []
+            indent = ""
+        elif indent != previndent:
+            if len(indent) > len(previndent):
+                categories.append(prevtext)
+            else:
+                categories.pop()
+        previndent = indent
+        prevtext = text
+
+        change = line[0]
+        if change != " ":
+            section = parsed
+            for category in categories:
+                section.setdefault(category, {})
+                section = section[category]
+            section.setdefault(text, {})
+            section[text][None] = change
+
+    return parsed
+
+
+def format_changes(section, name=None, lines=None):
+    if not name:
+        lines = []
+    else:
+        if name.startswith("#"):
+            lines.append(f"\n{name}")
+        else:
+            change = section.get(None)
+            name = name.replace("-", change or "*", 1)
+            if change:
+                name = change + name[1:]
+            lines.append(name)
+
+    for key, value in section.items():
+        if key is not None:
+            format_changes(value, name=key, lines=lines)
+
+    if not name:
+        return "\n".join(lines).lstrip()
+
+
 if __name__ == "__main__":
     with open(os.environ["GITHUB_EVENT_PATH"], "r") as f:
         event = json.load(f)
@@ -27,6 +89,10 @@
         if channel["id"] == "development":
             before = channel["versions"][0]["version"]
 
+    last_build_diff = subprocess.check_output(["git", "diff", f"{before}:CHANGELOG.md", f"{after}:CHANGELOG.md", "-U99999"]).decode()
+    parsed = parse_diff(last_build_diff)
+    changes = format_changes(parsed)
+
     requests.post(
         os.environ["BUILD_WEBHOOK"],
         headers={"Accept": "application/json", "Content-Type": "application/json"},
@@ -50,6 +116,10 @@
                             "name": "Changelog:",
                             "value": "\n".join([
                                 f"[Since last release ({release})]({event['repository']['html_url']}/blob/{after}/CHANGELOG.md)",
+                                f"Since last build ({before[:8]}):",
+                                "```diff",
+                                changes,
+                                "```",
                             ])
                         },
                         {