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@peterc
Created September 19, 2011 14:17
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irb3 - Run an IRB-esque prompt over multiple Ruby implementations at once using RVM
#!/usr/bin/env ruby
# encoding: utf-8
# irb3 - Runs an IRB-esque prompt (but it's NOT really IRB!) over multiple
# versions of Ruby at once (using RVM)
#
# By Peter Cooper, BSD licensed
#
# Main dependency is term-ansicolor for each impl:
# rvm exec gem install term-ansicolor
#
# 1. Type in expressions and press enter.
# 2. Leave space on the end of lines to enter more lines.
# 3. Add # all to run all versions, nothing for default
# 4. Add # version,version,version to run specific versions.
# 5. exit on its own to exit (or Ctrl+D)
require 'readline'
require 'term/ansicolor'
require 'tempfile'
include Term::ANSIColor
ALL_VERSIONS = %w{1.8.6 1.8.7 1.9.2 1.9.3}
DEFAULT_VERSIONS = %w{1.8.7 1.9.2}
loop do
# Read lines
lines = []
begin
line = Readline::readline('> ' + bold)
print reset
Readline::HISTORY << line
line.chomp!
lines << line
exit if line =~ /^exit$/i
end while line =~ /\s+$/
# Determine versions to run
versions = case line
when /\# all$/
ALL_VERSIONS.dup
when /\#\s(.*)$/
[*$1.strip.split(',').map(&:strip)]
else
DEFAULT_VERSIONS.dup
end
# Create code
f = Tempfile.new('irb3')
f.puts %{# encoding: utf-8
require 'rubygems'
require 'term/ansicolor'
ARRAY = ['a', 'b', 'c']
HASH = { :name => "Fred", :age => 40, :gender => :male }
ARRAY2 = [1,2,3]
STRING = "Hello"
STRING2 = "çé"
STRING3 = "ウabcé"
o = begin
Term::ANSIColor.green + eval(<<-'STUFFHERE'
#{lines.join("\n")}
STUFFHERE
).inspect + Term::ANSIColor.reset
rescue Exception => e
Term::ANSIColor.red + "!! \#{e.class}: \#{e.message}" + Term::ANSIColor.reset
end
print o}
f.close
versions.each do |version|
result = `rvm #{version} exec ruby #{f.path}`
puts " #{version} => #{result}"
end
puts
end
@abelmartin
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I can't believe no one's post this comment yet: THANKS!

Your video & this script is a great way to introduce 1.9.2 to people who haven't gotten up to speed yet.

Much appreciated!

@gmarik
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gmarik commented Nov 24, 2011

Great idea!
Thank you!

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