A little script to upgrade rails from version to version for a project that has rspec and cucumber specs

upgrade-rails-version.sh

#!/bin/bash
function checkParams() {
  if [[ ! $1 || ! $2 ]]
    then
      echo "use like this: ./upgrade-rails.sh <path-to-rails-project> <rails-version>..."
      exit 0
  fi
}

function cdToPath() {
  cd $1
}

v20=(2.0.0 2.0.1 2.0.2 2.0.4 2.0.5)
v21=(2.1.0 2.1.1 2.1.2)
v22=(2.2.2 2.2.3)
v23=(2.3.2 2.3.3 2.3.4 2.3.5 2.3.6 2.3.7 2.3.8 2.3.9 2.3.10 2.3.11 2.3.12 2.3.14 2.3.15 2.3.16 2.3.17 2.3.18)
v30=(3.0.0 3.0.1 3.0.2 3.0.3 3.0.4 3.0.5 3.0.6 3.0.7 3.0.8 3.0.9 3.0.10 3.0.11 3.0.12 3.0.13 3.0.14 3.0.15 3.0.16 3.0.17 3.0.18 3.0.19 3.0.20)
v31=(3.1.0 3.1.1 3.1.2 3.1.3 3.1.4 3.1.5 3.1.6 3.1.7 3.1.8 3.1.9 3.1.10 3.1.11 3.1.12)
v32=(3.2.0 3.2.1 3.2.2 3.2.3 3.2.4 3.2.5 3.2.6 3.2.7 3.2.8 3.2.9 3.2.10 3.2.11 3.2.12 3.2.13)
versions=(${v20[*]} ${v21[*]} ${v22[*]} ${v23[*]} ${v30[*]} ${v31[*]} ${v32[*]})

function containsVersion() {
  for v in ${versions[*]}; do [[ $1 == ${v} ]] && return 1; done
  return 0
}

function updateFiles() {
  echo "changing rails to version $1..."
  sed -i "s/gem 'rails',.*'[0-9]\{1,2\}.[0-9]\{1,2\}.[0-9]\{1,2\}'/gem 'rails', '$1'/g" Gemfile
  sed -i "s/RAILS_GEM_VERSION = '[0-9]\{1,2\}.[0-9]\{1,2\}.[0-9]\{1,2\}'/RAILS_GEM_VERSION = '$1'/g" config/environment.rb
}

function runBundle() {
  echo "running bundler..."
  bundle update rails | grep " rails"
  bundle install | grep "Installing"
}

function runSpecs() {
  echo "running rspec specs..."
  bundle exec rspec spec
  echo "running cucumber specs..."
  bundle exec cucumber --tag ~@javascript features
}

function exitScript() {
  echo "exiting since the input is not a rails version from 2.0.x to 3.2.x..."
  exit 0
}

checkParams $1 $2
cdToPath $1
containsVersion $2
if [[ $? == 1 ]]
  then
    updateFiles $2
    runBundle
    runSpecs
  else
    exitScript
fi

unset -f checkParams
unset -f cdToPath
unset -f containsVersions
unset -f updateFiles
unset -f runBundle
unset -f runSpecs
unset -f exitScript