// -*- c++ -*-

 // Use a DIMACS max flow file as stdin.

 // dim_to_dot < dimacs_max_flow_file > dot_output_file

 // This program makes a dot file from a dimacs max flow file. 

 // This program can be an aid in making up to date visualized documantation 

 // of demo programs.

 // For later documentation (if marci does not do it)

 // Az a graphviz csomag egy egyszeru formatuma, ami egy graphrajzolo csomag.

 // Az EdgeSubGraphAdaptor doksijaban szerepel egy kirajzolt graf. Azt nem

 // kezzel csinaltam, hanem a megfelelo dim file-bol ezzel a progival. A

 // doxygen ugyanis ilyet eszik, igy a juzer vizualisan is latja a grafot a

 // doksiban, es sajat maga is le tudja futtatni az algoritmust, mert ott van

 // a kezeben a dim file is. Es mivel ez egy generalt file, ezert ha vmit

 // valtoztatunk a dim-en, ezt is konnyu bemasolni. Uff.

 #include <iostream>

 #include <fstream>

 #include <lemon/smart_graph.h>

 #include <lemon/dimacs.h>

 using namespace lemon;

 using std::cout;

 using std::endl;

 int main(int argc, char *argv[]) 

 {

   if(argc<2)

   {

       std::cerr << "USAGE: sub_graph_adaptor_demo input_file.dim" << std::endl;

       std::cerr << "The file 'input_file.dim' has to contain a max flow instance in DIMACS format (e.g. sub_graph_adaptor_demo.dim is such a file)." << std::endl;

       return 0;

   }

   //input stream to read the graph from

   std::ifstream is(argv[1]);

   typedef SmartGraph Graph;

   typedef Graph::Edge Edge;

   typedef Graph::Node Node;

   typedef Graph::EdgeIt EdgeIt;

   typedef Graph::NodeIt NodeIt;

   typedef Graph::EdgeMap<int> LengthMap;

   Graph g;

   Node s, t;

   LengthMap length(g);

   readDimacs(is, g, length, s, t);

   cout << "digraph lemon_dot_example {" << endl;

   cout << "  node [ shape=ellipse, fontname=Helvetica, fontsize=10 ];" << endl;

   for(NodeIt n(g); n!=INVALID; ++n) {

     if (n==s) {

       cout << "  n" << g.id(n) 

 	   << " [ label=\"" << g.id(n) << " (s)\" ]; " << endl;

     } else {

       if (n==t) {

 	cout << "  n" << g.id(n) 

 	     << " [ label=\"" << g.id(n) << " (t)\" ]; " << endl; 

       } else {

 	cout << "  n" << g.id(n) 

 	     << " [ label=\"" << g.id(n) << "\" ]; " << endl; 

       }

     }

   }

   cout << "  edge [ shape=ellipse, fontname=Helvetica, fontsize=10 ];" << endl;

   for(EdgeIt e(g); e!=INVALID; ++e) {

     cout << "  n" << g.id(g.source(e)) << " -> " << " n" << g.id(g.target(e))

 	 << " [ label=\"" << g.id(e) 

 	 << ", length:" << length[e] << "\" ]; " << endl;

   } 

   cout << "}" << endl;

 }