"pipenv run --help" does not help, but tries to run

[ttencate]

Issue description

All pipenv subcommands accept --help, like pipenv install --help, pipenv sync --help, and so on. But this doesn't work for pipenv run.

Expected result

pipenv run --help should print help about using this subcommand (flags, etc.).

Actual result

pipenv run --help gets upset when I ask for help:

$ pipenv run --help
Traceback (most recent call last):
  File "/usr/bin/pipenv", line 11, in <module>
    load_entry_point('pipenv==2018.11.15.dev0', 'console_scripts', 'pipenv')()
  File "/usr/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/usr/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/usr/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/usr/lib/python3.8/site-packages/pipenv/vendor/click/decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/usr/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/usr/lib/python3.8/site-packages/pipenv/cli/command.py", line 407, in run
    do_run(
  File "/usr/lib/python3.8/site-packages/pipenv/core.py", line 2328, in do_run
    do_run_posix(script, command=command)
  File "/usr/lib/python3.8/site-packages/pipenv/core.py", line 2296, in do_run_posix
    os.execl(
  File "/usr/lib/python3.8/os.py", line 534, in execl
    execv(file, args)
FileNotFoundError: [Errno 2] No such file or directory

I guess that run terminates the command parsing, and it's trying to run an executable named --help. It would be more helpful if the first non-option argument would terminate argument parsing instead, with the customary special -- option available to forcibly terminate argument parsing.

Steps to replicate

See above.

$ pipenv --version
pipenv, version 2018.11.15.dev0
$ python --version
Python 3.8.1

[amhrasmussen]

Hi @ttencate
This improvement has already been implemented in the master branch. Unfortunately, until #3369 happens you will have to install from git to get this...

[ttencate]

Great to hear, thanks! I'm in no hurry to get the fix, just thought it was confusing behaviour for newcomers.