Insufficient option usage help

[atombender]

It's possible to write this:

        cli.StringFlag{
            Name:  "config, c",
            Usage: "Load configuration from this file",
        },

Now the help says:

GLOBAL OPTIONS:
   --config, -c     Load configuration from this file
  [...]

But this doesn't tell the end user that the flag takes a value. The usual way is to show that it is:

   --config FILE, -c FILE   Load configuration from FILE

As far as I can see, you can't do this. The flag package, of course, has its own way:

flag.String("c", "", "Load configuration from `file`")

Here, the backtick-enclosed part of the help will be used to infer what the name of the value is.

[jszwedko]

Agreed, support for placeholders would be nice. Thanks for the idea!