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task :gem_setup do
class GemSetup
def initialize(options = {}, &block)
@gems = []
@options = options.dup
@verbose = @options.delete(:verbose)
run(&block)
end
def run(&block)
return unless block_given?
instance_eval(&block)
setup
end
def gem(name, version = nil, options = {})
if version.respond_to?(:merge!)
options = version
else
options[:version] = version
end
@gems << [name, options]
end
# all gems defined, let's try to load/install them
def setup
require 'rubygems'
require 'rubygems/dependency_installer'
@gems.each do |name, options|
setup_gem(name, options)
end
end
def setup_gemspec(gemspec)
gemspec.dependencies.each do |dependency|
dependency.version_requirements.as_list.each do |version|
gem(dependency.name, version)
end
end
setup
end
# First try to activate.
# If activation fails, try to install and activate again.
# If the second activation also fails, try to require as it may just as
# well be in $LOAD_PATH.
def setup_gem(name, options)
version = [options[:version]].compact
lib_name = options[:lib] || name
log "activating #{name}"
Gem.activate(name, *version)
rescue Gem::LoadError
log "activating #{name} failed, try to install"
install_gem(name, version, options)
end
# tell rubygems to install a gem
def install_gem(name, version, options)
installer = Gem::DependencyInstaller.new(options)
temp_argv(options[:extconf]) do
log "installing #{name}"
installer.install(name, *version)
end
Gem.activate(name, *version)
log "install and final activation successful"
rescue Gem::GemNotFoundException => ex
log "installation failed: #{ex}, use normal require"
require(options[:lib] || name)
log "require successful, cannot verify version though"
end
# prepare ARGV for rubygems installer
def temp_argv(extconf)
if extconf ||= @options[:extconf]
old_argv = ARGV.clone
ARGV.replace(extconf.split(' '))
end
yield
ensure
ARGV.replace(old_argv) if extconf
end
private
def log(msg)
return unless @verbose
if defined?(Log)
Log.info(msg)
else
puts(msg)
end
end
def rubyforge; 'http://gems.rubyforge.org/' end
def github; 'http://gems.github.com/' end
end
end
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