fix: update CHANGELOG and automate (#1674)

* fix: update CHANGELOG and automate

* chore(release): v5.0.3

changelog.py

@@ -0,0 +1,66 @@
+import json
+import re
+import subprocess
+
+def update_changelog():
+    with open('src/version', 'r') as f:
+        raw_version = f.read()
+    version = re.search('\"(.*)\"', raw_version).groups()[0]
+    changelog = [f"## v{version}"]
+    changelog.append("### What\'s Changed")
+
+    with open('CHANGELOG.md', 'r') as f:
+        previous = f.readline().replace("##", '').strip()
+
+    if previous == version:
+        print(f"No changes to version {version}")
+        return
+    print(f"Adding logs from {previous}..{version}")
+
+    raw_current_branch = subprocess.run([
+        "git",
+        "branch",
+        "--show-current",
+    ], capture_output=True)
+    current_branch = raw_current_branch.stdout.decode('utf-8')
+
+    raw_commits = subprocess.run([
+        "git",
+        "log",
+        f"{previous}..{current_branch}",
+        "--oneline",
+    ], capture_output=True)
+    commits = [line[:7] for line in raw_commits.stdout.decode('utf-8').split('\n')]
+
+    prs = set()
+    for commit in commits:
+        commit_output = subprocess.run([
+            'gh',
+            'pr',
+            'list',
+            '--json',
+            'author,number,title,url',
+            '--search',
+            f'"{commit}"',
+        ], capture_output=True)
+        commit_details = json.loads(commit_output.stdout.decode('utf-8'))[0]
+        if not commit_details['number']:
+            continue
+        if commit_details['number'] in prs:
+            continue
+        prs.add(commit_details['number'])
+        changelog.append(f"* {commit_details['title']} by @{commit_details['author']['login']} in {commit_details['url']}")
+
+    changelog.append('\n')
+    changelog.append(f"**Full Changelog**: https://github.com/codecov/codecov-action/compare/{previous}..{version}\n")
+
+    with open('CHANGELOG.md', 'r') as f:
+        for line in f:
+            changelog.append(line.strip())
+
+    with open('CHANGELOG.md', 'w') as f:
+        f.write('\n'.join(changelog))
+
+
+if __name__=="__main__":
+    update_changelog()