Inspect all ruby files in the current commit with rubocop

gdcop.sh

alias gdcop="git diff --name-only | grep '\.rb' | tr '\n' ' ' | sed 's/,$/\n/' | xargs rubocop"

# $ git status
# On branch master
# Your branch is up-to-date with 'origin/master'.
# Changes not staged for commit:
#   (use "git add <file>..." to update what will be committed)
#   (use "git checkout -- <file>..." to discard changes in working directory)
# 
# 	modified:   History.md
# 	modified:   lib/rgeo/geo_json.rb
# 	modified:   lib/rgeo/geo_json/coder.rb
# 
# no changes added to commit (use "git add" and/or "git commit -a")

#  $ gdcop
# Inspecting 2 files
# ...

# gdcop -a
# autocorrects 2 files ...