Bash script starter file - colors, status messages, custom functions, etc

bash-script-base.sh

#!/bin/sh

# Originally pulled from: https://robots.thoughtbot.com/shell-script-suggestions-for-speedy-setups

# Exit if any subcommand fails
set -e

RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[0;33m'
NO_COLOR='\033[0m'
CLEAR_LINE='\r\033[K'

printf "[1/6]🔎   checking dependencies"


# Check if a commmand exists in the path/has been installed.
if ! command -v node > /dev/null; then

  # Set a specific color on a per-line basis
  printf "${CLEAR_LINE}💀${RED}   You must install node on your system before setup can continue${NO_COLOR}\n"
  printf "ℹ️   On macOS🍎 you should 'brew install node'\n"
  exit -1
fi


# Check command output, e.g. version number verification
if [[ $(node --version) != "v4.6.0" ]]; then
  printf "${CLEAR_LINE}⚠️${YELLOW}   You are not using a known working version of node.${NO_COLOR}\n"
  printf "ℹ️   This might not be a problem but if you're having issues, try installing 4.6.0\n"
  printf "[1/6]🔎   checking dependencies"
fi


# Run a script or install something, redirecting output to /dev/null for a silent installation
# (Errors printed to stderr will still be output, this just supresses regular output from stdout
printf "${CLEAR_LINE}[2/6]⏳   Installing yarn packages"
yarn > /dev/null


# Example of a custom function, this one checks out git dependencies
function clone {
  printf "⏳   $1 is being cloned"
  cd $DIR/..

  if [ ! -d $1 ]; then
    # don't stop the script if there is an error cloning from github
    set +e
    git clone $2 > /dev/null

    # if the last command gives a non-zero exit code we should warn the user
    if [[ $? != 0 ]]; then
      printf "${CLEAR_LINE}❌${RED}   $1 failed to clone! You might not have permissions.${NO_COLOR}\n"
    fi
    set -e
  fi

  cd $DIR
}

clone dependency_one git@github.com:my_org/dependency_one.git
clone dependency_two git@github.com:my_org/dependency_two.git



# Divide scripts into subcommands with a specific purpose, then 
# call them all at once in the main script to keep things clean
. ./bin/colors

./bin/setup_steps/check_dependencies
./bin/setup_steps/install_plugins
./bin/setup_steps/setup_ssl
./bin/setup_steps/pull_environment_vars_from_heroku

printf "${CLEAR_LINE}[6/6]🎉${GREEN}   Finished!${NO_COLOR}\n"