Git compare branches by commit msg

Author: singiamtel

git-compare-cherried

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# Usage: ./compare_branches.sh <upstream_branch> <head_branch>
+# Example: ./compare_branches.sh main feature/my-branch
+
+if [ $# -lt 2 ]; then
+  echo "Usage: $0 <upstream_branch> <head_branch>"
+  exit 1
+fi
+
+UPSTREAM=$1
+HEAD=$2
+
+echo "Analyzing commits between $UPSTREAM and $HEAD..."
+
+# Get commits that are in HEAD but not in UPSTREAM (similar to git cherry)
+UNIQUE_COMMITS=$(git rev-list $UPSTREAM..$HEAD)
+
+if [ -z "$UNIQUE_COMMITS" ]; then
+  echo "No unique commits found in $HEAD that aren't in $UPSTREAM."
+  exit 0
+fi
+
+# Get all commit messages from upstream for comparison
+UPSTREAM_MSGS=$(git log --format="%s" $UPSTREAM)
+
+echo "Commits in $HEAD that aren't in $UPSTREAM based on commit message:"
+echo "--------------------------------------------------------------"
+
+while IFS= read -r commit; do
+  # Get the commit message for this commit
+  COMMIT_MSG=$(git log -n 1 --format="%s" $commit)
+  
+  # Check if this commit message exists in upstream
+  if ! echo "$UPSTREAM_MSGS" | grep -q "^$COMMIT_MSG$"; then
+    # This commit message doesn't exist in upstream, so show it
+    git show --no-patch --format="%C(yellow)%h%C(reset) - %s %C(green)(%cr) %C(bold blue)<%an>%C(reset)" $commit
+  fi
+done <<< "$UNIQUE_COMMITS"