Method: SimpleData.generate

Defined in:
lib/simple-data.rb

.generate(file, fields, compress = false, tags: nil, sections: nil, &block) ⇒ Object

Generating file



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# File 'lib/simple-data.rb', line 131

def self.generate(file, fields, compress = false,
                  tags: nil, sections: nil, &block)
    # Sanity check
    if compress && !const_defined?(:IOCompressedWrite)
        raise Error, 'compression not supported (add zstd-ruby gem)'
    end

    # Open file
    io = File.open(file, 'w')

    # Magic string
    io.puts "# simple-data:1"

    # Tags
    if tags && !tags.empty?
        io.puts "#"
        tags.each do |name, value|
            io.puts "# @%-8s %s" % [ name, value ]
        end
    end

    # Spec
    io.puts "#"
    io.puts "# --<spec>--"
    maxlen = fields.map {|(_, name)| name.size }.max
    fields.each do |(type, name, desc)|
        if desc
            io.puts "# %-4s : %-*s (%s)" % [ type, maxlen, name, desc ]
        else
            io.puts "# %-4s : %s" % [ type, name ]
        end
    end

    # Custom sections
    if sections && !sections.empty?
        io.puts "#"
        sections.each do |name, value|
            io.puts "# --<#{name}>--"
            value.split(/\r?\n/).each do |line|
                io.puts "# #{line}"
            end
        end
    end

    # Data 
    io.puts "#"
    io.puts "# --<%s>--" % [ compress ? 'data:compressed' : 'data' ]

    # Deal with compression
    io = IOCompressedWrite.new(io) if compress
    
    # Instantiate SimpleData
    sda = self.new(io, fields, :create, tags: tags, sections: sections)
    block ? block.call(sda) : sda
ensure
    sda.close if sda && block
end