Git Hook "prepare-commit-msg" to add branch name to commit body

prepare-commit-msg.sh

#!/bin/sh

# get file path
COMMIT_MSG_FILE="$1"
# get file content
COMMIT_MSG=$(cat "$COMMIT_MSG_FILE")
# find the current branch name
BRANCH_NAME=$(git rev-parse --abbrev-ref HEAD)
# format extra content for commit message
SUFFIX=$(printf "\n\nBranch: %s" "$BRANCH_NAME")
# handle rebase process and amend commits
if [ "${COMMIT_MSG%"$SUFFIX"}" = "$COMMIT_MSG" ] && [ "$BRANCH_NAME" != "HEAD" ]; then
    printf "%s" "$SUFFIX" >> "$COMMIT_MSG_FILE"
fi