96 lines
2.8 KiB
Ruby
96 lines
2.8 KiB
Ruby
module Rails
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module Upgrading
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class GemfileGenerator
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def generate_new_gemfile
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if has_environment?
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generate_gemfile
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else
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raise FileNotFoundError, "Can't find environment.rb [config/environment.rb]!"
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end
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end
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def has_environment?
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File.exists?("config/environment.rb")
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end
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def environment_code
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File.open("config/environment.rb").read
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end
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def generate_gemfile
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environment_file = environment_code
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# Get each line that starts with config.gem
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gem_lines = environment_file.split("\n").select {|l| l =~ /^\s*config\.gem/}
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# Toss those lines to a generator class; the lines are evaluated in the
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# context of that instance.
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config = GemfileGenerator.new
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config.instance_eval(gem_lines.join("\n"))
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config.output
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end
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end
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class GemfileGenerator
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# Creates a target for the config.gem calls
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def config
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self
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end
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def initialize
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@gems = []
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end
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# Receive a call to add a gem to the list
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def gem(name, options={})
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data = {}
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# Add new keys from old keys
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data[:require_as] = options[:lib] if options[:lib]
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data[:source] = options[:source] if options[:source]
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version = options[:version]
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@gems << [name, version, data]
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end
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# Generate the Gemfile output
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def output
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# Generic preamble, taken from Yehuda Katz's blog
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preamble = <<STR
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# Edit this Gemfile to bundle your application's dependencies.
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# This preamble is the current preamble for Rails 3 apps; edit as needed.
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path "/path/to/rails", :glob => "{*/,}*.gemspec"
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git "git://github.com/rails/rack.git"
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gem "rails", "3.0.pre"
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STR
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preamble + "\n" + generate_upgraded_code
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end
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# Get Gemfile call for all the gems
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def generate_upgraded_code
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code = @gems.map do |name, version, data|
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version_string = (version ? "'#{version}'" : nil)
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source = data.delete(:source)
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data_string = nil
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unless data.empty?
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data_string = data.to_a.map {|k, v| ":#{k} => '#{v}'"}.join(", ")
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end
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# If we have a source, generate a call to +source+ then output the
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# gem call. Otherwise, just generate the gem requirement.
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if source
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str = ["'#{name}'", version_string, data_string].compact.join(", ")
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"source '#{source}'\ngem #{str}"
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else
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str = ["'#{name}'", version_string, data_string].compact.join(", ")
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"gem #{str}"
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end
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end.join("\n")
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end
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end
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end
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end |