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Implement reading from file.

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This commit is contained in:
Bert Peters
2019-12-13 22:35:08 +01:00
parent b79c4c9fd1
commit 1171e34c18
1 changed files with 32 additions and 5 deletions
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37
2019/src/runner.cpp
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@@ -3,10 +3,13 @@
#include <chrono> #include <chrono>
#include <iostream> #include <iostream>
#include <string_view> #include <string_view>
#include <optional>
#include <fstream>
struct AoCOptions { struct AoCOptions {
aoc2019::solution_t implementation; aoc2019::solution_t implementation;
bool run_timer; bool run_timer;
std::optional<std::ifstream> input_file;
}; };
static AoCOptions parse_options(const int argc, const char* argv[]) { static AoCOptions parse_options(const int argc, const char* argv[]) {
@@ -16,6 +19,7 @@ static AoCOptions parse_options(const int argc, const char* argv[]) {
auto show_help = [argv] (int exit_status = 0) { auto show_help = [argv] (int exit_status = 0) {
std::cerr << "Usage: " << argv[0] << " [--timer|-t] [--part2|-2] [--help|-h] DAY\n" std::cerr << "Usage: " << argv[0] << " [--timer|-t] [--part2|-2] [--help|-h] DAY\n"
<< "\t--timer|-t: print execution time\n" << "\t--timer|-t: print execution time\n"
<< "\t--input ARG|-fARG: use given input file as puzzle input"
<< "\t--part2|-2: run part 2\n" << "\t--part2|-2: run part 2\n"
<< "\t --help|-h: show this message\n"; << "\t --help|-h: show this message\n";
std::exit(exit_status); std::exit(exit_status);
@@ -31,8 +35,8 @@ static AoCOptions parse_options(const int argc, const char* argv[]) {
// Handle flag arguments // Handle flag arguments
if (arg[1] != '-') { if (arg[1] != '-') {
// Shorthand flags // Shorthand flags
for (char c : arg.substr(1)) { for (int j = 1; j < arg.size(); ++j) {
switch (c) { switch (arg[j]) {
case '2': case '2':
part2 = true; part2 = true;
break; break;
@@ -45,8 +49,23 @@ static AoCOptions parse_options(const int argc, const char* argv[]) {
show_help(); show_help();
break; break;
case 'f':
if (j == arg.size() - 1) {
if (i == argc - 1) {
std::cerr << "Option -f requires an argument.";
show_help(1);
} else {
options.input_file = std::ifstream(argv[i + 1]);
++i;
}
} else {
options.input_file = std::ifstream(std::string(arg.substr(j)));
j = arg.size();
}
break;
default: default:
std::cerr << "Unknown flag '" << c << "'.\n\n"; std::cerr << "Unknown flag '" << arg[j] << "'.\n\n";
show_help(1); show_help(1);
} }
} }
@@ -58,6 +77,14 @@ static AoCOptions parse_options(const int argc, const char* argv[]) {
options.run_timer = true; options.run_timer = true;
} else if (arg == "--help"sv) { } else if (arg == "--help"sv) {
show_help(); show_help();
} else if (arg == "--input"sv) {
if (i == argc - 1) {
std::cerr << "Option -f requires an argument.";
show_help(1);
} else {
options.input_file = std::ifstream(argv[i + 1]);
++i;
}
} else { } else {
show_help(1); show_help(1);
} }
@@ -91,11 +118,11 @@ static AoCOptions parse_options(const int argc, const char* argv[]) {
} }
int main(int argc, const char *argv[]) { int main(int argc, const char *argv[]) {
const auto options = parse_options(argc, argv); auto options = parse_options(argc, argv);
if (options.implementation != nullptr) { if (options.implementation != nullptr) {
const auto start = std::chrono::high_resolution_clock::now(); const auto start = std::chrono::high_resolution_clock::now();
options.implementation(std::cin, std::cout); options.implementation(options.input_file ? *options.input_file : std::cin, std::cout);
if (options.run_timer) { if (options.run_timer) {
const std::chrono::duration<double> duration = std::chrono::high_resolution_clock::now() - start; const std::chrono::duration<double> duration = std::chrono::high_resolution_clock::now() - start;
std::cerr << "Time taken: " << duration.count() << "s\n"; std::cerr << "Time taken: " << duration.count() << "s\n";