Enhancement - confirm3

- Added a tri-state confirmation function for confirming bulk operations
  allowing the user to answer yes/no/all to and optionally allow,
  disallow or bulk-allow big changes.

src/util.cpp

@@ -74,6 +74,40 @@ bool confirm (const std::string& question)
   return (answer == "y" || answer == "ye" || answer == "yes") ? true : false;   // TODO i18n
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// 0 = no
+// 1 = yes
+// 2 = all
+int confirm3 (const std::string& question)
+{
+  std::vector <std::string> options;
+  options.push_back ("yes");
+  options.push_back ("no");
+  options.push_back ("all");
+
+  std::string answer;
+  std::vector <std::string> matches;
+
+  do
+  {
+    std::cout << question
+              << " ("
+              << options[0] << "/"
+              << options[1] << "/"
+              << options[2]
+              << ") ";
+
+    std::getline (std::cin, answer);
+    answer = trim (answer);
+    autoComplete (answer, options, matches);
+  }
+  while (matches.size () != 1);
+
+       if (matches[0] == "yes") return 1;
+  else if (matches[0] == "all") return 2;
+  else                          return 0;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 void delay (float f)
 {

src/util.h

@@ -51,6 +51,7 @@ for (typeof (c) *foreach_p = & (c);                                \
 
 // util.cpp
 bool confirm (const std::string&);
+int confirm3 (const std::string&);
 void delay (float);
 std::string formatSeconds (time_t);
 std::string formatSecondsCompact (time_t);