Class: Gem::Specification

Inherits:
Object
  • Object
show all
Defined in:
lib/nix/gem-nix-command.rb

Constant Summary collapse

@@sha256_cache = 
{}

Instance Method Summary collapse

Instance Method Details

#nix_derivation ⇒ Object 



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# File 'lib/nix/gem-nix-command.rb', line 70

def nix_derivation
  {
    :name => full_name,
    :basename => nix_name(:short),
    :sha256 => sha256,
    :meta => nix_meta
  }
end

#nix_meta ⇒ Object 



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# File 'lib/nix/gem-nix-command.rb', line 31

def nix_meta
  {
    :homepage => homepage,
    :description => summary,
    :longDescription => description,
    :license => licenses
  }.reject { |k, v| v.nil? or (v.respond_to?(:empty?) and v.empty?) }
end

#nix_name(mode = :symbol) ⇒ Object 



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# File 'lib/nix/gem-nix-command.rb', line 16

def nix_name(mode = :symbol)
  case mode
  when :symbol
    full_name.gsub(/[.-]/, '_').to_sym
  when :short
    name.gsub(/[.-]/, '_')
  when :short_sym
    nix_name(:short).to_sym
  when :rhs_sym
    ("g." + nix_name(:symbol).to_s).to_sym
  else
    raise "Unknown mode #{mode} passed to nix_name"
  end
end

#sha256 ⇒ Object 



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# File 'lib/nix/gem-nix-command.rb', line 45

def sha256
  cache_file = "#{ENV['HOME']}/.gem/nix-sha256.cache"
  if @@sha256_cache.empty? and FileTest.exists?(cache_file)
    File.open(cache_file,'r') { |f| @@sha256_cache = Marshal.load(f) }
  end

  unless @@sha256_cache.key?(src_url)
    tmp="/tmp/ruby-gems-nix-tmp-file"
    system("nix-prefetch-url #{src_url.gsub(/([:= `$;])/,'\\\\\1')} > #{tmp} 2>/dev/null")
    if $? == 0
      file = File.new(tmp)
      hash = file.readlines().first().chomp
      file.close()
      File.delete(tmp)
      @@sha256_cache[src_url] = hash
    else
      @@sha256_cache[src_url] = "no hash"
    end

    File.open(cache_file, "w+") do |f| Marshal.dump(@@sha256_cache, f) end
  end

  return @@sha256_cache[src_url]
end

#src_url ⇒ Object 



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# File 'lib/nix/gem-nix-command.rb', line 40

def src_url
  "http://production.cf.rubygems.org/gems/#{full_name}.gem"
end