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Adds a basic argument parser, allowing machine options to be set.

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This commit is contained in:
Thomas Harte 2017-11-18 19:34:38 -05:00
parent 27b123549b
commit 073e439518
1 changed files with 49 additions and 4 deletions
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53
OSBindings/SDL/main.cpp
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@ -6,9 +6,9 @@
// Copyright © 2017 Thomas Harte. All rights reserved.
//
#include <cstdio>
#include <iostream>
#include <memory>
#include <cstdio>
#include <SDL2/SDL.h>
@ -117,19 +117,63 @@ bool KeyboardKeyForSDLScancode(SDL_Keycode scancode, Inputs::Keyboard::Key &key)
}
struct ParsedArguments {
std::string file_name;
Configurable::SelectionSet selections;
};
/*! Parses an argc/argv pair to discern program arguments. */
ParsedArguments parse_arguments(int argc, char *argv[]) {
ParsedArguments arguments;
for(int index = 1; index < argc; ++index) {
char *arg = argv[index];
// Accepted format is:
//
// --flag sets a Boolean option to true.
// --flag=value sets the value for a list option.
// name sets the file name to load.
// Anything starting with a dash always makes a selection; otherwise it's a file name.
if(arg[0] == '-') {
while(*arg == '-') arg++;
// Check for an equals sign, to discern a Boolean selection from a list selection.
std::string argument = arg;
std::size_t split_index = argument.find("=");
if(split_index == std::string::npos) {
arguments.selections[argument] = std::unique_ptr<Configurable::Selection>(new Configurable::BooleanSelection(true));
} else {
std::string name = argument.substr(0, split_index);
std::string value = argument.substr(split_index+1, std::string::npos);
arguments.selections[name] = std::unique_ptr<Configurable::Selection>(new Configurable::ListSelection(value));
}
} else {
arguments.file_name = arg;
}
}
return arguments;
}
int main(int argc, char *argv[]) {
SDL_Window *window = nullptr;
// Attempt to parse arguments.
ParsedArguments arguments = parse_arguments(argc, argv);
// Perform a sanity check on arguments.
if(argc < 2) {
if(arguments.file_name.empty()) {
std::cerr << "Usage: " << argv[0] << " [file]" << std::endl;
return -1;
}
// Determine the machine for the supplied file.
std::list<StaticAnalyser::Target> targets = StaticAnalyser::GetTargets(argv[1]);
std::list<StaticAnalyser::Target> targets = StaticAnalyser::GetTargets(arguments.file_name.c_str());
if(targets.empty()) {
std::cerr << "Cannot open " << argv[1] << std::endl;
std::cerr << "Cannot open " << arguments.file_name << std::endl;
return -1;
}
@ -256,6 +300,7 @@ int main(int argc, char *argv[]) {
Configurable::Device *configurable_device = machine->configurable_device();
if(configurable_device) {
configurable_device->set_selections(configurable_device->get_user_friendly_selections());
configurable_device->set_selections(arguments.selections);
}
// Run the main event loop until the OS tells us to quit.