git-map
run an arbitrary command against all commits, or n evenly-spaced commits across time.
examples
count number of files for every commit:
git-map "git ls-files | wc -l"
count lines of code for 10 evenly-spaced commits:
git-map "grep '' -IR . --exclude-dir={.git,log} | wc -l " -n 10
boot up webserver and take a screenshot for 5 evenly-spaced commits:
git-map ~/screenshot.sh -n 5
# screenshot.sh
# Reinstall dependencies as they may be different for older commits
bundle install
# Boot up the server and record the process ID (so we can kill it later)
nohup bundle exec middleman >/dev/null 2>&1&
pid=$!
# Wait for the server to finish booting, then take a screenshot
sleep 5
open "http://localhost:4567"
sleep 5
timestamp=$(date +%s)
screencapture ~/Desktop/screenshot-$timestamp.jpg
kill $pid
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