rspec to minitest

gsubs.rb

# Usage
# ruby gsubs.rb './tests/**/*.rb'

ARGF.replace Dir[ARGV[0]] unless ARGV.empty?

require 'fileutils'

$GSUBS = \
[ 
  [ /^(\s*)(.+)\.should\s+be_true/      , '\1assert \2'            ],
  [ /^(\s*)(.+)\.should\s+be_false/     , '\1refute \2'            ],
  [ /^(\s*)(.+)\.should\s*==\s*(.+)$/   , '\1assert_equal \3, \2'  ],
  [ /^(\s*)(.+)\.should\s*==\s*(.+)$/   , '\1assert_match(\3, \2)' ],
  [ /^(\s*)(.+)\.should_not\s+be_(.+)$/ , '\1refute \2.\3?'        ],
# this next one isn't quite right because it needs to wrap the next lines as a lambda
  [ /\.should_receive\(([^\)]+)\)\.and_return\(([^\)]+)\)/,  '.stub(\1, \2) do |s|  # FIXME' ],
]

def changed_file(old_path)
  File.join( File.dirname(old_path), 'changed', File.basename(old_path) )
end

def flush_to_file!(lines, fname)
  FileUtils.mkdir_p File.dirname(fname)
  File.open(fname, 'w') do |f|
    lines.each do |str| f.puts str end
  end
  lines.clear
end

last_f = nil
changed = []
ARGF.each_line do |line|
  unless last_f.nil? || last_f == ARGF.path
    new_f = changed_file(last_f)
    flush_to_file! changed, new_f
  end
  new_line = $GSUBS.inject('') do |str, (rx, replace)|
    str = line.gsub(rx, replace)
  end
  changed << new_line
  last_f = ARGF.path
end

unless changed.empty?
  new_f = changed_file(last_f)
  flush_to_file! changed, new_f
end