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require 'rbconfig'
require 'rubygems'
require 'rubygems/specification'
require 'fileutils'
ruby = File.join(ENV["ruby"], "bin", RbConfig::CONFIG['ruby_install_name'])
out = ENV["out"]
bin_path = File.join(ENV["out"], "bin")
gem_home = ENV["GEM_HOME"]
gem_path = ENV["GEM_PATH"].split(":")
install_path = Dir.glob("#{gem_home}/gems/*").first
gemspec_path = ARGV[0]
if defined?(Encoding.default_internal)
Encoding.default_internal = Encoding::UTF_8
Encoding.default_external = Encoding::UTF_8
end
gemspec_content = File.read(gemspec_path)
spec = nil
if gemspec_content[0..2] == "---" # YAML header
spec = Gem::Specification.from_yaml(gemspec_content)
else
spec = Gem::Specification.load(gemspec_path)
end
FileUtils.mkdir_p("#{out}/nix-support")
# write meta-data
meta = "#{out}/nix-support/gem-meta"
FileUtils.mkdir_p(meta)
FileUtils.ln_s(gemspec_path, "#{meta}/spec")
File.open("#{meta}/name", "w") do |f|
f.write(spec.name)
end
File.open("#{meta}/install-path", "w") do |f|
f.write(install_path)
end
File.open("#{meta}/require-paths", "w") do |f|
f.write(spec.require_paths.join(" "))
end
File.open("#{meta}/executables", "w") do |f|
f.write(spec.executables.join(" "))
end
# add this gem to the GEM_PATH for dependencies
File.open("#{out}/nix-support/setup-hook", "a") do |f|
f.puts("addToSearchPath GEM_PATH #{gem_home}")
spec.require_paths.each do |dir|
f.puts("addToSearchPath RUBYLIB #{install_path}/#{dir}")
end
end
# create regular rubygems binstubs
FileUtils.mkdir_p(bin_path)
spec.executables.each do |exe|
File.open("#{bin_path}/#{exe}", "w") do |f|
f.write(<<-EOF)
#!#{ruby}
#
# This file was generated by Nix.
#
# The application '#{exe}' is installed as part of a gem, and
# this file is here to facilitate running it.
#
Gem.use_paths "#{gem_home}", #{gem_path.to_s}
require 'rubygems'
load Gem.bin_path(#{spec.name.inspect}, #{exe.inspect})
EOF
end
FileUtils.chmod("+x", "#{bin_path}/#{exe}")
end
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