Re: User command with -nargs=1

On 30/04/11 06:42, John Beckett wrote:
> I thought defining a user command with '-nargs=1' would mean
> that using more than one argument would give an error, however
> I can't see a difference between nargs=1 and nargs=*.
>
> command! -nargs=1 Test call Test('<args>')
> function! Test(args)
> call append('$', 'args: "' . a:args . '"')
> endfunction
>
> After sourcing the above:
> :new
> :Test (E471 Argument required; good)
> :Test a (displays 'args: "a"'; good)
> :Test a b (displays 'args: "a b"'; bad?)
>
> I thought '-nargs=1' would give "E488: Trailing characters"
> if more than one argument, and isn't "a b" two args?
>
> Above tested with Vim 7.3.170 and 7.2.18 on Windows and Linux.
>
> Is this something to do with allowing spaces in file names?
>
> John
>

Further experiment shows the following difference: with -nargs=1, ":Test
a b" sees one argument, 'a b'; with -nargs=* it sees two, 'a','b'. Try
the following (untested):

command! -nargs=* Type echo List(<f-args>)
function! List(...)
return a:000
enfunction

and try
:Type a b
-- then the same after replacing -nargs=1 by -nargs=*

Best regards,
Tony.
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