stamen

Static Menu Generator

git clone git://git.dimitrijedobrota.com/stamen.git

dynamic.cpp (2441B)

1 #include <cmath> 2 #include <cstddef> 3 #include <format> 4 #include <fstream> 5 #include <iostream> 6 #include <limits> 7 #include <span> 8 9 #include "stamen/stamen.hpp" 10 11 namespace { 12 int display(const stamen::Menu& menu) 13 { 14 const int sizei = static_cast<int>(menu.items().size()); 15 const size_t dgts = static_cast<size_t>(std::log10(sizei)) + 1; 16 int choice = 0; 17 18 while (true) 19 { 20 std::cout << std::format("{}:\n", menu.title()); 21 for (auto i = 0UL; i < menu.items().size(); i++) 22 { 23 std::cout << std::format(" {:{}}. {}\n", i, dgts, menu.item(i).prompt); 24 } 25 26 while (true) 27 { 28 std::cout << "Choose an option: "; 29 if (std::cin >> choice && choice >= -1 && choice < sizei) 30 { 31 if (choice == -1) 32 { 33 std::cout << "Choice: back\n"; 34 return 1; 35 } 36 37 const auto uchoice = static_cast<size_t>(choice); 38 std::cout << "Choice: " << menu.item(uchoice).prompt << "\n\n"; 39 const int res = menu.item(uchoice).callback(uchoice); 40 41 if (res < 2) break; 42 return res - 1; 43 } 44 45 if (std::cin.eof()) 46 { 47 std::cerr << "encountered end of input!\n"; 48 return std::numeric_limits<int>::max(); 49 } 50 51 std::cin.clear(); 52 std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); 53 std::cout << "Invalid option, please choose again!\n"; 54 } 55 56 std::cout << '\n' << std::flush; 57 } 58 59 return 1; 60 } 61 62 int finish(std::size_t /* unused */) 63 { 64 // return from everything so that memory can be freed 65 return 1000; 66 } 67 68 int operation1(std::size_t /* unused */) 69 { 70 std::cout << "1\n"; 71 std::cout << std::flush; 72 return 1; 73 } 74 75 int operation2(std::size_t /* unused */) 76 { 77 std::cout << "2\n"; 78 std::cout << std::flush; 79 return 1; 80 } 81 82 int operation3(std::size_t /* unused */) 83 { 84 std::cout << "3\n"; 85 std::cout << std::flush; 86 return 1; 87 } 88 89 } // namespace 90 91 int main(int argc, char* argv[]) 92 { 93 const std::span args(argv, argv + argc); 94 95 if (argc != 2) 96 { 97 std::cout << std::format("Usage: {} filename\n", args[0]); 98 return 1; 99 } 100 101 std::ifstream ifs(args[1]); 102 103 // read the configuration 104 stamen::Stamen inst(ifs); 105 106 // register free functions 107 inst.insert("finish", finish); 108 inst.insert("operation1", operation1); 109 inst.insert("operation2", operation2); 110 inst.insert("operation3", operation3); 111 112 // start the menu on specific panel 113 inst.dynamic("menu_main", display); 114 115 return 0; 116 }