Update the post creation CLI command

[RiccardoM]

Feature description

With #113 we've allowed to create posts with an empty message when there are some medias attached to them. This has caused the CLI command in that case to be very unnatural to use.

Currently the command is

desmoscli tx posts create <subspace> <message> <allows-comments> --flags

Which results (when an empty message is specified) to be:

desmoscli tx posts create "subspace" "" true/false --flags

This is very unnatural for the users and we should probably fix it.

Implementation proposal

What I suggest to do is improve the posting command by making the message an optional flag instead of a required argument:

desmoscli tx posts create <subspace> <allows-comments> \
  --message="My message"
  --flags

Of course, with this implementation inside the CLI tx command handler we need to check that the message is not empty when the medias are, and vice-versa, to make sure that at least one between the message and the medias are specified.

[kwunyeung]

How about this?

Making the cobra.MinimumArgs to 1. Only <subspace> is mandatory. Keep <message> as an argument but optional. Put --allow-comments as a flag and its default is true if not specified. The command can be like this.

desmoscli tx posts create <subspace> "My message" \
  --allow-comments=false
  --flags

I feel putting the <message> as an argument in the command line is more straightforward.

[RiccardoM]

@kwunyeung Love this proposal! Didn't remember viper allows for optional arguments

[leobragaz]

Kwun proposal is perfect!