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require 'thor/actions/empty_directory'
class Thor
module Actions
# Injects the given content into a file. Different from append_file,
# prepend_file and gsub_file, this method is reversible. By this reason,
# the flag can only be strings. gsub_file is your friend if you need to
# deal with more complex cases.
#
# ==== Parameters
# destination<String>:: Relative path to the destination root
# data<String>:: Data to add to the file. Can be given as a block.
# config<Hash>:: give :verbose => false to not log the status and the flag
# for injection (:after or :before).
#
# ==== Examples
#
# inject_into_file "config/environment.rb", "config.gem thor", :after => "Rails::Initializer.run do |config|\n"
#
# inject_into_file "config/environment.rb", :after => "Rails::Initializer.run do |config|\n" do
# gems = ask "Which gems would you like to add?"
# gems.split(" ").map{ |gem| " config.gem #{gem}" }.join("\n")
# end
#
def inject_into_file(destination, *args, &block)
if block_given?
data, config = block, args.shift
else
data, config = args.shift, args.shift
end
log_status = args.empty? || args.pop
action InjectIntoFile.new(self, destination, data, config)
end
class InjectIntoFile < EmptyDirectory
attr_reader :flag, :replacement
def initialize(base, destination, data, config)
super(base, destination, { :verbose => true }.merge(config))
data = data.call if data.is_a?(Proc)
@replacement = if @config.key?(:after)
@flag = @config.delete(:after)
@flag + data
else
@flag = @config.delete(:before)
data + @flag
end
end
def invoke!
say_status :inject, config[:verbose]
replace!(flag, replacement)
end
def revoke!
say_status :deinject, config[:verbose]
replace!(replacement, flag)
end
protected
# Adds the content to the file.
#
def replace!(regexp, string)
unless base.options[:pretend]
content = File.read(destination)
content.gsub!(regexp, string)
File.open(destination, 'wb') { |file| file.write(content) }
end
end
end
end
end
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