src/bin/pkgman/DecisionProvider.cpp

   1 /*
   2  * Copyright 2011, Oliver Tappe <zooey@hirschkaefer.de>
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6
   7 #include <stdio.h>
   8 #include <string.h>
   9
  10 #include "DecisionProvider.h"
  11
  12
  13 DecisionProvider::DecisionProvider(bool interactive)
  14         :
  15         fInteractive(interactive)
  16 {
  17 }
  18
  19
  20 bool
  21 DecisionProvider::YesNoDecisionNeeded(const BString& description,
  22         const BString& question, const BString& yes, const BString& no,
  23         const BString& defaultChoice)
  24 {
  25         if (description.Length() > 0)
  26                 printf("%s\n", description.String());
  27
  28         bool haveDefault = defaultChoice.Length() > 0;
  29
  30         while (true) {
  31                 printf("%s [%s/%s]%s: ", question.String(), yes.String(), no.String(),
  32                         haveDefault
  33                                 ? (BString(" (") << defaultChoice << ") ").String() : "");
  34
  35                 if (!fInteractive) {
  36                         printf("%s\n", yes.String());
  37                         return true;
  38                 }
  39
  40                 char buffer[32];
  41                 if (fgets(buffer, 32, stdin)) {
  42                         if (haveDefault &&  (buffer[0] == '\n' || buffer[0] == '\0'))
  43                                 return defaultChoice == yes;
  44                         int length = strlen(buffer);
  45                         for (int i = 1; i <= length; ++i) {
  46                                 if (yes.ICompare(buffer, i) == 0) {
  47                                         if (no.ICompare(buffer, i) != 0)
  48                                                 return true;
  49                                 } else if (no.Compare(buffer, i) == 0) {
  50                                         if (yes.ICompare(buffer, i) != 0)
  51                                                 return false;
  52                                 } else
  53                                         break;
  54                         }
  55                         fprintf(stderr, "*** please enter '%s' or '%s'\n", yes.String(),
  56                                 no.String());
  57                 }
  58         }
  59 }