Rubodiff! Diffs the rubocop results of your current branch with the results of develop

rubodiff

#!/bin/bash
GREEN='\033[0;32m'
# The ampersand at the end of this line makes this command run in the background...
rubocop --format simple --out ~/rubocop_results_current_branch.txt &

# ...while all this runs in the foreground...
mkdir -p ~/rubodiff_temp
rm -rf   ~/rubodiff_temp/*
git archive develop | tar -x -C ~/rubodiff_temp
rubocop --format simple --out ~/rubocop_results_develop.txt ~/rubodiff_temp
# Normalize the filenames that rubocop prints
sed -E -i '' 's/\/Users\/[^\/]+\/rubodiff_temp\///g' ~/rubocop_results_develop.txt

# ...and this waits until everything is done...
wait

# ...and finally a diff is printed.
{
  # Hack to prevent annoying copyright info from being printed
  colordiff -U0 -F "==" ~/rubocop_results_develop.txt ~/rubocop_results_current_branch.txt | tee ~/rubodiff_results.txt
} &> /dev/null
cat ~/rubodiff_results.txt

if [[ ! -s ~/rubodiff_results.txt ]] ; then
  echo -e "${GREEN}There were no changes in rubocop."
fi ;

# Cleanup
rm ~/rubocop_results_current_branch.txt
rm ~/rubocop_results_develop.txt
rm ~/rubodiff_results.txt
rm -rf ~/rubodiff_temp

Install

• First, install colordiff so we can have colors (fancy!) brew install colordiff
• Download this gist
• Make it executable chmod +x /path/to/rubodiff
• Run it /path/to/rubodiff
• Optionally, put it somewhere in your search path so you can run it without its full path

Sample output

--- /Users/ahamon/rubocop_results_develop.txt   2015-06-04 18:02:37.000000000 -0400
+++ /Users/ahamon/rubocop_results_current_branch.txt    2015-06-04 18:02:36.000000000 -0400
@@ -1,2 +1,12 @@
+== app/poros/account_downloader.rb ==
+C: 17: 25: Prefer single-quoted strings when you don't need string interpolation or special symbols.
+C: 19:  1: Extra blank line detected.
+C: 20:  1: Extra blank line detected.
+C: 21:  1: Extra blank line detected.
+== app/poros/ad_updater.rb ==
+C: 27:  1: Extra blank line detected.
+C: 28:  1: Extra blank line detected.
+C: 29:  1: Extra blank line detected.
+C: 30:  1: Extra blank line detected.

-330 files inspected, no offenses detected
+332 files inspected, 8 offenses detected

Its just a diff between the two outputs of rubocop for the different branches.