prepare-commit-msg

#!/bin/bash

# Save as .git/hooks/prepare-commit-msg (or if one exists, append to it)
# and execute `chmod a+x .git/hooks/prepare-commit-msg`
# This way you can customize which branches should be skipped when
# prepending commit message. 
if [ -z "$BRANCHES_TO_SKIP" ]; then
  BRANCHES_TO_SKIP=()
fi

BRANCH_NAME=$(git symbolic-ref --short HEAD)
# Uncomment line below to strip out prefixes like 'feature/' from branch names
#BRANCH_NAME="${BRANCH_NAME##*/}"

BRANCH_EXCLUDED=$(printf "%s\n" "${BRANCHES_TO_SKIP[@]}" | grep -c "^$BRANCH_NAME$")
BRANCH_IN_COMMIT=$(grep -c "\[$BRANCH_NAME\]" $1)

if [ -n "$BRANCH_NAME" ] && ! [[ $BRANCH_EXCLUDED -eq 1 ]] && ! [[ $BRANCH_IN_COMMIT -ge 1 ]]; then 
  sed -i.bak -e "1s/^/[$BRANCH_NAME] /" $1
fi