TRACKS CHANGES TO RAILS' APP SKELETON SINCE A GIVEN VERSION

git_track_rails_skeleton

#!/usr/bin/env zsh

# 1304046900  TRACKS CHANGES TO RAILS' APP SKELETON SINCE A GIVEN VERSION

old_version="3.1.1"

# Exit on failure
#
set -e

cd tmp

gem uninstall rails
gem install rails -v "$old_version"

rails new skeleton_check
cd skeleton_check
git init
git add *
git checkout -b "$old_version"
git commit --allow-empty-message
rm -rf *
cd ..

gem update rails

rails new skeleton_check
cd skeleton_check
git add *
git checkout master
git commit --allow-empty-message

if output=$(git diff --exit-code --name-status "$old_version" HEAD); then
  echo "No changes"
else

  # Group name statuses
  #
  while read -r line; do
    case $line in
      (M*) modified+=("$line") ;;
      (A*) added+=("$line") ;;
      (D*) deleted+=("$line") ;;
    esac
  done <<< "$output"

  # Display groups
  #
  if [[ -n $modified ]]; then
    print -l -- "${modified[@]}"
    echo
  fi
  if [[ -n $added ]]; then
    print -l -- "${added[@]}"
    echo
  fi
  if [[ -n $deleted ]]; then
    print -l -- "${deleted[@]}"
    echo
  fi
  echo "Current version: $(rails -v)"
fi

cd ..
rm -rf skeleton_check