poetry export help doesn't provide the format options

[absassi]

• [x] I am on the latest Poetry version.
• [x] I have searched the issues of this repo and believe that this is not a duplicate.

• [ ] If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: any

• Poetry version: 1.0.0b8
• Link of a Gist with the contents of your pyproject.toml file:

Issue

One needs to browse Poetry docs (which are not even online for 1.0 beta yet, or I couldn't find a link) or the source code to find out how to use the poetry export command, because the help text doesn't provide the list of available formats.

$ poetry export

[ValueError]
Invalid export format: None
$ poetry export --help
USAGE
  poetry export [-f <...>] [-o <...>] [--without-hashes] [--dev] [-E <...>] [--with-credentials]

OPTIONS
  -f (--format)          Format to export to.
  -o (--output)          The name of the output file.
  --without-hashes       Exclude hashes from the exported file.
  --dev                  Include development dependencies.
  -E (--extras)          Extra sets of dependencies to include. (multiple values allowed)
  --with-credentials     Include credentials for extra indices.

GLOBAL OPTIONS
  -h (--help)            Display this help message
  -q (--quiet)           Do not output any message
  -v (--verbose)         Increase the verbosity of messages: "-v" for normal output, "-vv" for more verbose output and "-vvv" for debug
  -V (--version)         Display this application version
  --ansi                 Force ANSI output
  --no-ansi              Disable ANSI output
  -n (--no-interaction)  Do not ask any interactive question

$ poetry export -f anything

[ValueError]
Invalid export format: anything

In the current docs, the option -f is documented as:

• --format (-f): The format to export to. Currently, only requirements.txt is supported.

This should be in the command help too.

[finswimmer]

Hello @absassi,

thanks a lot for reporting. Must get lost somewhere. Will be fixed with https://github.com/sdispater/poetry/pull/1653.

fin swimmer