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@filterfish
Created July 16, 2010 00:38
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Lightweigh version of rvm.
#!/usr/bin/env ruby
require 'pp'
require 'pathname'
search_paths = ['/usr/local']
Conf_file = "#{ENV['HOME']}/.lrvm"
def write_path(path)
File.open(Conf_file, 'w') do |fd|
fd.write(path.to_s)
end
end
def full_path
path = (File.exist?(Conf_file)) ? "#{File.read(Conf_file)}:#{ENV['PATH']}" : ENV['PATH']
path.split(/:/).uniq.join(":")
end
def default_ruby_path
ENV['PATH'].split(/:/).map { |p| Pathname.new(p) }.detect do |path|
path.join("ruby").exist? unless path.fnmatch("*ruby*")
end.to_s
end
def find_ruby_paths(paths)
paths.inject([]) do |all_dirs, path|
all_dirs.tap do |_all_dirs|
_all_dirs << Pathname.new(path).entries.inject([]) do |dirs,dir|
dirs.tap do |_dirs|
_dirs << dir.expand_path(path).join("bin") if dir.fnmatch("*ruby*")
end
end
end
end.flatten
end
ruby_paths = find_ruby_paths(search_paths)
ruby_paths.insert(0, default_ruby_path)
ruby_paths.each_with_index do |path,n|
STDERR.puts "[%i] %s" % [n, path]
end
STDIN.each do |input|
index = Integer(input.strip) rescue nil
if index && index < ruby_paths.size
write_path(ruby_paths[index])
puts "PATH=#{full_path}"
exit
else
puts "Please enter a number between 0 and #{ruby_paths.size - 1}"
end
end
STDERR.puts "Ok doing nothing as asked"
@filterfish
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I personally like to install ruby versions system wide so this script looks at what versions are installed (it currently looks in /usr/local/bin but it's easy to add more) and prints the different options for you to select. It adds the path to $HOME/.lrvm so you can use it for other purposes such as adding the version to your prompt. You can then eval the output into your current environment:

eval $(/path/to/lrvm)

You can add this to your shell config file (assumes sh compatible):

alias lrvm='eval $(/path/to/lrvm)'

To add the version of ruby to your prompt (zsh):

precmd () { ruby_version=$(ruby -v | awk '{print $2}') }
PROMPT='%m:%/-{${ruby_version}}'

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