This library provides means and methods to parse command line arguments in the form of
command [OPTIONS...] subcommand_1 [OPTIONS...] subcommand_2 [OPTIONS...] ...
and is written in C.
Clone the library.
git clone https://github.com/cloud-automation/simple-argument-parser.git
Make a cd simple-argument-parser and create a build directory mkdir build & cd build.
Execute cmake .. and make to build the library.
Execute sudo make install to install the library into your system.
int command_handler(sap_command_list_t* commands, sap_option_list_t* options) {
unsigned int counter = 0;
sap_option_t* option = sap_get_option_by_index(options, counter);
while (option) {
printf("%s : %s\n", option.label, option.value);
option = sap_get_option_by_index(options, ++counter);
}
return 0;
}
int main_handler(sap_command_list_t* commands, sap_option_list_t* options) {
/* handles the first arguments in ./somecommand --optionA --optionB ... */
sap_option_t* key_option = sap_get_option_by_key(options, "key");
if (!key_option) {
printf("No option 'key'.\n");
return -1;
}
printf("Value of option 'key' = %s\n", key_option->value);
return 0;
}
int main(int argc, char* argv[]) {
sap_t parser;
sap_init(&parser, argc, argv[]);
sap_set_default_command(&parser, default_handler);
sap_set_command(&parser, "command", command_handler);
int ret = sap_execute(&parser);
sap_free(&parser);
return ret;
}
The parser itself only parses the first argument as a command. Since the file that should be executed is part of the argument list we create a parser and set a default handler. The default handler points to the default_handler method which will be called on execution when no command is given or recognized. The main_handler is now called with a list of commands and options all parsed from the original argc and argv.
When the command string turns up first in the argc datastructure then the command handler method is called. The command list given to the command handler method will be one short, missing the first command.
Copyright (C) 2017 Stefan Poeter (Stefan.Poeter[at]cloud-automation.de)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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