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On 23-Mar-2018 17:28 +0100, 'Andy Wokula' via vim_dev wrote:
> Am 13.04.2011 um 17:07 schrieb Andy Wokula:
>> Am 09.04.2011 20:27, schrieb Ingo Karkat:
>>> On 09-Apr-2011 14:54, Andy Wokula wrote:
>>>> For example, I have a command :InFunc . It's quite a trivial
>>>> command, it takes an argument Ex-command and executes it within a
>>>> function. Purpose is to automatically restore the highlighting state
>>>> and the last search pattern.
>>>> :h function-search-undo
>>>>
>>>> Thus, mostly the Ex-command will be :global or :substitute .
>>>>
>>>> Problem: :global has the default range "1,$" whereas :substitute has
>>>> the default range ".". For :InFunc, I'm urged to specify a default
>>>> range (e.g. either -range (current line) or -range=% (whole buffer)).
>>>> I don't want that, instead I want the default range of the argument
>>>> command to be in effect. But at the moment, it's not possible to
>>>> check for an empty range.
>>>>
>>>>
>>>> " What I use now:
>>>> :[range]InFunc {cmd} " execute :[range]{cmd}, for :subst
>>>> :[range]InFunc! {cmd} " execute :{cmd}, for :global
>>>>
>>>> com! -bang -range -nargs=+ InFunc<line1>,<line2>call
>>>> InFunc(<bang>0,<q-args>)
>>>>
>>>> func! InFunc(bang, cmd) range
>>>> if a:bang
>>>> exec a:cmd
>>>> else
>>>> exec a:firstline.",".a:lastline. a:cmd
>>>> endif
>>>> endfunc
>>>>
>>>>
>>>> " I'd like to write the above this way:
>>>>
>>>> com! -range=NoDefault -nargs=+ InFunc<range>call InFunc(<q-args>)
>>>>
>>>> func! InFunc(cmd) range
>>>> exec a:range. a:cmd
>>>> endfunc
>>>>
>>>>
>>>> Oops, we would also need a new variable a:range !
>>>>
>>>> Maybe, actually,<range> and a:range are not needed, I just want to
>>>> be able to check for an empty range:
>>>>
>>>>
>>>> com! -range -nargs=+ InFunc<line1>,<line2>call InFunc(<q-args>)
>>>>
>>>> func! InFunc(cmd) range
>>>> if range_is_empty()
>>>> exec a:cmd
>>>> else
>>>> exec a:firstline.",".a:lastline. a:cmd
>>>> endif
>>>> endfunc
>>>>
>>>>
>>>> This would just a require a new function range_is_empty().
>>>
>>> Unless there are additional use cases where this could be useful, my
>>> first hunch is that it's not worth the effort.
>>
>> It's more about consistency:
>>
>> When you define a mapping, you can check if a count was given or not
>> (check v:count >= 1).
>>
>> When you define a command with -range, you cannot check if a range was
>> given or not.
>
> TIL it is indeed possible to check if a range was given or not:
>
> :com! -range Crwg :echo (<count>==-1 ? 'No range was given' : 'The given
> range is <line1>,<line2>')
>
> Works with Vim 7.0 onwards.
How did you dig up that old thread?! (But thanks for following up!) I've found
out about that, too:
To distinguish between no given range (then defaulting to something like the
last modified range) and a range, use -range=-1 and check <count>:
:command! -range=-1 Test echomsg <count> == -1 ? "'[,']" : <line1> . ',' .
<line2>
This emulates -range=% but allows :0Test (passed via first argument boolean
flag), too:
:command! -range=-1 Test call Test((<count> == 0), (<count> == -1 &&
<line2> == 1 ? '1,' . line('$') : '<line1>,<line2>'))
- -- regards, ingo
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