Carton intercepts --help, --version, and probably others

[rkleemann]

When run with carton, my script cannot do anything with the --help and --version command parameters, as carton intercepts them and prints out it's own help and version information.

The command I'm using: carton exec ./my-script.pl --help

Carton should stop processing command line options once it discovers an exec, as everything after that point should be passed, unmolested, to the process.

[miyagawa]

Use carton exec -- ./myscript.pl --help.

[rkleemann]

That feels like a hack.

[miyagawa]

It is a pretty normal and standard behavior for POSIX tools that use getopt
or similar.

[miyagawa]

although -- does and will always work to separate command options, i will make a change to not intercept --help and --version specifically. Reopened the bug for tracking.

[maxhq]

I just stumbled upon this. The main problem IMHO is that from a user's point of view the behaviour changes depending on the arguments (s)he give to the script:
carton exec bin/myscript --yoworks but
carton exec bin/myscript --help doesn't.

I think there are two reasons these two arguments could just be dropped:

1. carton exec --versionand carton exec --help are most likely not used in any scripts in the wild
2. You can always do carton help exec which feels natural for e.g. git users.

I am not sure what to do with --verbose though.

[miyagawa]

Well, for now just use --, that will always work.

[s1037989]

Yes, -- works for me. Curious tho why it's intercepting -n? I went thru all the lower case letters and it intercepted -h and -v obviously, but why -n?