module Graphviz

Copyright, 2014, by Samuel G. D. Williams. <www.codeotaku.com>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Constants

VERSION

Public Class Methods

output(graph, path: nil, format: 'pdf', dot: 'dot') click to toggle source

Outputs the graph using the dot executable. @return [String] any data generated by the command unless an output path is specified.

@option options [String] :format ('pdf') The output format (e.g. pdf). @option options [String] :path The output path, if not specified data is returned. @option options [String] :dot ('dot') The dot executable to use.

# File lib/graphviz.rb, line 33
def self.output(graph, path: nil, format: 'pdf', dot: 'dot')
        output_format = format
        
        if path
                # Grab the output format from the file name:
                if path =~ /\.(.*?)$/
                        output_format ||= $1
                end
        end
        
        output, input = IO.pipe
        pipeline = Process::Pipeline.(dot, "-T#{output_format}")
        
        writer = Thread.new do
                graph.dump_graph(input)
                
                input.close
        end
        
        if path
                pipeline.write(path, input: output)
        else
                return pipeline.read(input: output)
        end
ensure
        writer.join
end