git-pre-commit.rb

#!/usr/bin/env ruby

# git pre-commit hook
#
# This will ensure 100% code coverage and all specs passing before allowing a commit
# to the git repo.
#
# Place the file at .git/hooks/pre-commit and use chmod a+x to make it executable.

system('rake clean >/dev/null 2>&1')

path = ENV['PATH'].split(':')[1..-1].map { |p| File.expand_path(p) }.detect do |path|
  File.file?(File.join(path, 'rcov'))
end

raise "rcov not found in any path" if path.nil?

output = %x{#{path}/rcov -t --no-html spec/{requests,models}/*_spec.rb 2>&1}
raise "Error: #{output}" if $? != 0

rspec, rcov = output.split("\n").last(2)

raise "Cannot parse rspec '#{rspec}'" unless rspec_match = rspec.match(/\A(\d+)\sexamples?,\s(\d+)\sfailures?(?:,\s(\d)\spendings?)?\z/)
raise "Cannot parse rcov '#{rcov}'"   unless rcov_match  = rcov.match(/\A(100\.0|[1-9]?\d\.\d)%/)

examples, failures, pending = rspec_match.captures.map { |n| n.to_i }
coverage = rcov_match[1].to_f

if failures.nonzero? || coverage != 100
  puts "Bad: #{coverage}% coverage, #{failures} failures, #{pending} pending specs"
  exit 1
elsif pending.nonzero?
  puts "Good: 100% coverage, no failures, #{pending} pending specs"
else
  puts 'Perfect: 100% coverage, no failures, no pending specs'
end