## Enforce that changed lines can only be documentation
#!/bin/sh
#
# This git pre-commit hook makes sure you haven't changed any Ruby code
# while contributing to documentation.
#
# Author: Mislav
#
# To enable this hook, make this file executable.

if git-rev-parse --verify HEAD 2>/dev/null
then
	git-diff-index -p -M --cached HEAD
else
	# NEEDSWORK: we should produce a diff with an empty tree here
	# if we want to do the same verification for the initial import.
	:
fi | ruby -e '
  file = nil
  lineno = nil
  errors = []
  
  while gets
    case $_
    when /^\+{3} (.+)/
      file = $1.sub(/^b\//, "")
      # puts file
      next
    when /^-{3} /
      next
    when /^@@ -\d+,\d+ \+(\d+),(\d+) @@/
      lineno = $1.to_i
      next
    when /^([+-])(.+)/
      op = $1 == "+" ? "added" : "removed"
      line = $2
      if line !~ /^\s*#/
        errors << "#{file}:#{lineno}: #{op} #{line.inspect}"
      end
    end

    lineno += 1 if lineno
  end

  unless errors.empty?
    $stderr.puts "Changed Ruby code detected!"
    $stderr.puts errors.join
    $stderr.puts "COMMIT FAILED."
    exit 1
  else
    exit 0
  end
'