Module: Tap::Env::Gems

Defined in:
lib/tap/env/gems.rb

Overview

Methods for working with RubyGems.

Class Method Summary collapse

Class Method Details

.gemspec(gem_name) ⇒ Object

Returns the gemspec for the specified gem. A gem version can be specified in the name, like ‘gem >= 1.2’. The gem is not activated by this method.



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# File 'lib/tap/env/gems.rb', line 13

def gemspec(gem_name)
  return gem_name if gem_name.kind_of?(Gem::Specification)
  
  dependency = if gem_name.kind_of?(Gem::Dependency)
    gem_name
  else
    # figure the version of the gem, by default >= 0.0.0
    gem_name.to_s =~ /^([^~<=>]*)(.*)$/
    name, version = $1.strip, $2
    return nil if name.empty?
    version = Gem::Requirement.default if version.empty?

    # note the last gem matching the dependency requirements
    # is the latest matching gem
    Gem::Dependency.new(name, version)
  end
  
  Gem.source_index.search(dependency).last
end

.select_gems(latest = true) ⇒ Object

Selects gem specs for which the block returns true. If latest is specified, only the latest version of each gem will be passed to the block.



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# File 'lib/tap/env/gems.rb', line 36

def select_gems(latest=true)
  specs = latest ?
    Gem.source_index.latest_specs :
    Gem.source_index.gems.collect {|(name, spec)| spec }
  
  # this song and dance is to ensure that specs are sorted
  # by name (ascending) then version (descending) so that
  # the latest version of a spec appears first
  specs_by_name = {}
  specs.each do |spec|
    next unless !block_given? || yield(spec) 
    (specs_by_name[spec.name] ||= []) << spec
  end
  
  specs = []
  specs_by_name.keys.sort.each do |name|
    specs_by_name[name].sort_by do |spec| 
      spec.version
    end.reverse_each do |spec|
      specs << spec
    end
  end
  
  specs
end