Using CLI parser inside a library

[marcmellanox]

Hi,

Is it possible to ue CLI library inside a library.
I would like to use it to parse environment variables.
A library doesn't have a main entry, but some init function.would it be possible to do something like
CLI::App mylib{"My library"};
mylib.add_option("--my_option", opt)->envname("MY_OPTION");

CLI11_PARSE(mylib): <- with no argc and argv

Thanks

[marcmellanox]

I made something like this and it works fine.

int mylib_init(){

CLI::App lib{"Library"};
lib.add_option("my_option", opt)
->envname("MY_OPTION")
->check(CLI::Range(0,100));

    const char *argv[]= {"My library"};

try {
lib.parse(1, (argv));
} catch(const CLI::ParseError &e) {
return ERROR;
}
}
But still waiting for suggestion if someone already did it differently

[phlptp]

We do this all the time inside HELICS.
The first layer usually gets passed the argc, argv from the command line, but subsequent layers will also use the single string parser which does the splitting as well and a vectorized version which takes a std::vector<string> instead of the argv structure.

CLI11 is also used for parsing config files.

In your case if you were just using it to capture environment variables, you can probably just call

try {
lib.parse("");
} catch(const CLI::ParseError &e) {
return ERROR;
}
}