Semantic Release Git Hook

commit-msg

#!/bin/sh

# Config options

min_length=4
max_length=50
types=("feat" "fix" "perf")

# End config options


regexpstart="^("
regexp="${regexpstart}"

for type in "${types[@]}"
do
  if [ "$regexp" != "$regexpstart" ]; then
    regexp="${regexp}|"
  fi
  regexp="${regexp}$type"
done

regexp="${regexp})(\(.+\))?: "
regexp="${regexp}.{$min_length,$max_length}$"

function print_error() {
  echo -e "\n\e[1m\e[31m[INVALID COMMIT MESSAGE]"
  echo -e "------------------------\033[0m\e[0m"
  echo -e "\e[1mValid types:\e[0m \e[34m${types[@]}\033[0m"
  echo -e "\e[1mMax length (first line):\e[0m \e[34m$max_length\033[0m"
  echo -e "\e[1mMin length (first line):\e[0m \e[34m$min_length\033[0m\n"
}

# get the first line of the commit message
INPUT_FILE=$1
START_LINE=`head -n1 $INPUT_FILE`

if [[ ! $START_LINE =~ $regexp ]]; then
  # commit message is invalid according to semantic-release conventions
  print_error
  exit 1
fi

You can save this into your .git/hooks/ folder for any repos which exist already; or you can run the following commands that will set things up for every new repo you init in the future:

git config --global init.templatedir '~/.git-templates'
mkdir -p ~/.git-templates/hooks
cp commit-msg ~/.git-templates/hooks