Silly conversion script: graphviz-digraph-to-mermaid-flowchart.rb

graphviz-digraph-to-mermaid-flowchart.rb

#!/usr/bin/env ruby

nodes = {}
edges = Hash.new { |hash, key| hash[key] = [] }
at_end = false

ARGF.map(&:strip).reject(&:empty?).each_with_index do |line, index|
  case [index, line]
  in 0, /digraph\s*\{/
  in 1.., '}'
    at_end = true
  in 1.., /"(?<from_name>[^"]+)"\s*->\s*"(?<to_name>[^"]+)"\s*;/
    raise "Expected end of file, got #{line.inspect}" if at_end
    edges[$~[:from_name]] << $~[:to_name]
  in 1.., /"(?<name>[^"]+)"\s*;/
    raise "Expected end of file, got #{line.inspect}" if at_end
    nodes[$~[:name]] = $~[:name].gsub("/", "_")
  else
    raise "Unexpected input #{line.inspect}"
  end
end

puts '%%{init: {"flowchart": {"padding": 40} } }%%'
puts 'flowchart RL'

nodes.each do |k, v|
  puts "  #{v}([\"#{k}\"])"
end

puts ''
edges.each do |k, edges|
  edges.each do |node|
    puts "  #{nodes[k]} --> #{nodes[node]}"
  end
end