So you want your Ruby script to install missing gems instead of dying? Take this method:
def installing_missing_gems(&block)
yield
rescue LoadError => e
gem_name = e.message.split('--').last.strip
install_command = 'gem install ' + gem_name
# install missing gem
puts 'Probably missing gem: ' + gem_name
print 'Auto-install it? [yN] '
gets.strip =~ /y/i or exit(1)
system(install_command) or exit(1)
# retry
Gem.clear_paths
puts 'Trying again ...'
require gem_name
retry
end
Use it like this:
installing_missing_gems do
require 'thor'
require 'nokogiri'
# some code using those gems
end
Posted by Dominik Schöler to makandra dev (2014-05-21 14:18)