Teach the release notes script to find GitHub Squash and Merge PRs

tools/release/release_notes.py

@@ -83,15 +83,15 @@ API_URL = 'https://api.github.com/repos/grpc/grpc/pulls/'
 
 
 def get_commit_log(prevRelLabel, relBranch):
-    """Return the output of 'git log --pretty=online --merges prevRelLabel..relBranch' """
+    """Return the output of 'git log prevRelLabel..relBranch' """
 
     import subprocess
-    print("Running git log --pretty=oneline --merges " + prevRelLabel + ".." +
-          relBranch)
-    return subprocess.check_output([
-        "git", "log", "--pretty=oneline", "--merges",
+    glg_command = [
+        "git", "log", "--pretty=oneline", "--committer=GitHub",
         "%s..%s" % (prevRelLabel, relBranch)
-    ])
+    ]
+    print("Running ", " ".join(glg_command))
+    return subprocess.check_output(glg_command)
 
 
 def get_pr_data(pr_num):
@@ -120,11 +120,19 @@ def get_pr_data(pr_num):
 def get_pr_titles(gitLogs):
     import re
     error_count = 0
-    match = b"Merge pull request #(\d+)"
-    prlist = re.findall(match, gitLogs, re.MULTILINE)
+    # PRs with merge commits
+    match_merge_pr = b"Merge pull request #(\d+)"
+    prlist_merge_pr = re.findall(match_merge_pr, gitLogs, re.MULTILINE)
     print("\nPRs matching 'Merge pull request #<num>':")
-    print(prlist)
+    print(prlist_merge_pr)
     print("\n")
+    # PRs using Github's squash & merge feature
+    match_sq = b"\(#(\d+)\)$"
+    prlist_sq = re.findall(match_sq, gitLogs, re.MULTILINE)
+    print("\nPRs matching '[PR Description](#<num>)$'")
+    print(prlist_sq)
+    print("\n")
+    prlist = prlist_merge_pr + prlist_sq
     langs_pr = defaultdict(list)
     for pr_num in prlist:
         pr_num = str(pr_num)