Positional before command? #125
Description
I'm trying to add a required positional before a group of commands but the parsing isn't working correctly. Here's an example:
#include "args/args.hxx"
int main(int argc, const char **argv) {
args::ArgumentParser parser("Compress and decompress leveldb DB");
args::HelpFlag help(parser, "help", "Display this help menu", {'h', "help"});
args::CompletionFlag completion(parser, {"completion"});
args::Positional<std::string> db_file(parser, "input", "Input database file",
args::Options::Required);
args::Group commands(parser, "commands");
args::Command compress(commands, "compress",
"Enables compression on a database");
args::Command decompress(commands, "decompress",
"Remove compression on a database");
try {
parser.ParseCLI(argc, argv);
} catch (const args::Completion &e) {
std::cout << e.what();
return 0;
} catch (const args::Help &) {
std::cout << parser;
return 0;
} catch (const args::ParseError &e) {
std::cerr << e.what() << std::endl;
std::cerr << parser;
return 1;
}
std::cout << "Input database is: " << args::get(db_file) << std::endl;
if (compress) {
std::cout << "Compressing database" << std::endl;
}
if (decompress) {
std::cout << "Decompressing database" << std::endl;
}
return 0;
}It should work like this:
$ ./main input-file compress
Unknown command: input-file
./main COMMAND {OPTIONS} input
Compress and decompress leveldb DB
OPTIONS:
-h, --help Display this help menu
input Input database file
commands
compress Enables compression on a database
decompress Remove compression on a database
"--" can be used to terminate flag options and force all following
arguments to be treated as positional options
Not like this, but the command is recognized
$ ./main compress input-file
Passed in argument, but no positional arguments were ready to receive it: input-file
./main compress
Enables compression on a database
OPTIONS:
And finally only with the command, the input field is still being requested.
$ ./main compress
terminate called after throwing an instance of 'args::RequiredError'
what(): Option 'input' is required
Aborted (core dumped)