module Build

parameter　walker　Build::Graph::Walker

The completed walker containing tasks.

returns　Graphviz::Graph

A graph object ready for rendering.

def self.graph_visualisation(walker)
	graph = Graphviz::Graph.new("G", rankdir: "LR")
	
	walker.tasks.each do |node, task|
		input_nodes = []
		output_nodes = []
		
		task.inputs.each do |path|
			input_nodes << graph.add_node(path.basename)
		end
		
		task.outputs.each do |path|
			output_nodes << graph.add_node(path.basename)
		end
		
		if output_nodes.size == 1
			input_nodes.each do |input_node|
				edge = input_node.connect(output_nodes.first)
				edge.attributes[:label] = node.title
			end
		end
	end
	
	return graph
end