TRT-635: Update release notes to include git commit messages.

Author: owenlittlejohns

bin/extract-release-notes.sh

@@ -10,6 +10,7 @@
 # 2024-01-23: Copied and modified from Swath Projector repository to HyBIG.
 # 2025-07-15: Copied and modified from HyBIG to earthdata-hashdiff.
 # 2025-09-05: Copied and modified from earthdata-hashdiff to HGA.
+# 2025-09-22: Append git commit messages to release notes.
 #
 ###############################################################################
 
@@ -28,5 +29,26 @@ LINK_PATTERN="^\[.*\]:.*https://github.com/nasa"
 # VERSION_PATTERN
 result=$(awk "/$VERSION_PATTERN/{c++; if(c==2) exit;} c==1" "$CHANGELOG_FILE")
 
+# Get all commit messages since the last release (marked with a git tag). If
+# there are no tags, get the full commit history of the repository.
+if [[ $(git tag) ]]
+then
+	# There are git tags, so get the most recent one
+	GIT_REF=$(git describe --tags --abbrev=0)
+else
+	# There are not git tags, so get the initial commit of the repository
+	GIT_REF=$(git rev-list --max-parents=0 HEAD)
+fi
+
+# Retrieve the title line of all commit messages since $GIT_REF, filtering out
+# those from the pre-commit-ci[bot] author.
+GIT_COMMIT_MESSAGES=$(git log --oneline --format="%s" --perl-regexp --author='^(?!pre-commit-ci\[bot\]).*$' ${GIT_REF}..HEAD)
+
+# Append git commit messages to the release notes:
+if [[ ${GIT_COMMIT_MESSAGES} ]]
+then
+	result+="\n\n## Commits\n\n${GIT_COMMIT_MESSAGES}"
+fi
+
 # Print the result
-echo "$result" |  grep -v "$VERSION_PATTERN" | grep -v "$LINK_PATTERN"
+echo -e "$result" |  grep -v "$VERSION_PATTERN" | grep -v "$LINK_PATTERN"