getopt on convert.automaton

aconvert.automaton/src/aconvert.automaton.cpp

 #include <iostream>
+#include <fstream>
 #include "AutomatonParser.h"
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+
 #include "automaton/FSM/FSM.h"
 #define FROM 1
+#define TO 2
 int fromAutomaton(std::istream& in, std::ostream& out) {
   AutomatonParser parser(in);
@@ -20,7 +27,45 @@ int toAutomaton(std::istream& in, std::ostream& out) {
 }
 int main(int argc, char* argv[]) {
-  int fromTo = FROM;
-  if(fromTo == FROM) return fromAutomaton(std::cin, std::cout);
-  else return toAutomaton(std::cin, std::cout);
+
+  int fromTo = 0;
+  int c;
+  
+  while (1) {
+    static struct option long_options[] = {
+      {"from", no_argument,       &fromTo, FROM},
+      {"to",   no_argument,       &fromTo, TO},
+      {0, 0, 0, 0}
+    };
+  
+    int option_index = 0;
+     
+    c = getopt_long (argc, argv, "", long_options, &option_index);
+
+    if (c == -1)
+      break;
+  
+    switch (c) {
+    case 0:
+      break;
+    default:
+      optind--;
+      goto more;
+    }
+  }
+more:
+
+  std::istream* in = &std::cin;
+  if(optind != argc) in = new std::ifstream(argv[optind]);
+
+  if(fromTo == FROM) {
+    fromAutomaton(*in, std::cout);
+  } else if(fromTo == TO) {
+    toAutomaton(*in, std::cout);
+  } else {
+    std::cerr << "error" << std::endl;
+  }
+  
+  if(c != -1) delete in;
+  return 0;
 }
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