Comments (3)
There's the KickOut attribute on Base: https://taywee.github.io/args/classargs_1_1Base.html
You can set this to true
on any argument that you want to terminate parsing on, and then use the iterator APIs for the rest.
As an example of this:
#include <iostream>
#include <args.hxx>
int main(int argc, char **argv)
{
args::ArgumentParser parser("This is a test program.", "This goes after the options.");
args::HelpFlag help(parser, "help", "Display this help menu", {'h', "help"});
args::Positional<std::string> filename(parser, "filename", "The file name");
filename.KickOut(true);
parser.Prog(argv[0]);
const std::vector<std::string> args(argv + 1, argv + argc);
const auto begin = std::begin(args);
const auto end = std::end(args);
auto rest = begin;
try
{
rest = parser.ParseArgs(begin, end);
}
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 << "Filename: " << *filename << '\n';
for (;rest != end; ++rest) {
std::cout << "Arg: " << *rest << '\n';
}
return 0;
}
And use of it:
> g++ -osample sample.cxx -I.
> ./sample -h main.py
./sample {OPTIONS} [filename]
This is a test program.
OPTIONS:
-h, --help Display this help menu
filename The file name
"--" can be used to terminate flag options and force all following
arguments to be treated as positional options
This goes after the options.
> ./sample main.py -h
Filename: main.py
Arg: -h
>
You could then use another parser on the rest (which is how subparsers and commands work), or pass it into an internal program, or whatever you want. rest
to end
are your iterators in that case.
from args.
Hello, thank you so much for the quick answer and amazing example. It all works just as I wanted.
from args.
Gladly! Another option that will work similarly is to gather the rest in a PositionalList<std::string> rest
argument at the end, and enforce that all calls use --
between the arguments. I find this way slightly less surprising, because the --
clearly signals separation between the internal and external arguments, but plenty of tools (particularly most language interpreters and docker and podman) just use a positional to implicitly separate. It's just a matter of personal taste and style.
from args.
Related Issues (20)
- Tag 2.6.4 has PATCH = 3 in args.hxx HOT 1
- use dd-style fail to get '\' in linux HOT 3
- Parse arguments from single string. HOT 1
- Doesn't save error messages properly when built with `ARGS_NOEXCEPT` HOT 6
- pkg-config file is broken when CMAKE_INSTALL_{INCLUDE,LIB}DIR is absolute HOT 1
- find_package(args REQUIRED) doesn't set args_VERSION HOT 3
- [6.4.3 regression] Installs pkgconfig into the root HOT 3
- Regression: Help string lists `{OPTIONS}` after positional arguments HOT 4
- Detect console/terminal width HOT 2
- 6.4.5: Tests fail HOT 1
- configure of a client project fails: An argument named "TRUE" appears in a conditional statement. HOT 1
- cmake doesn't define args_INCLUDE_DIRS HOT 2
- How to parse keyword-based arguments? HOT 1
- Supplying the same argument twice doesn't cause error HOT 1
- Missing argument doesn't throw exception HOT 1
- Setting default value for arguments HOT 2
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- Option to stop on an empty value HOT 4
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from args.