exists("##ColorScheme")

[Thilo Six]

Hello

according to ':h exists()' we can use 'exists("##ColorScheme")' to check for the
availability of an colorscheme.

:colorscheme
        desert
:echo exists("##desert")
        0


,----[  :h exists()  ]------------------------

exists({expr})  The result is a Number, which is non-zero if
                {expr} is defined, zero otherwise.
`---------------------------------------------

I am pretty sure this used to work somewhen. Is this a bug or am i doing s.th.
wrong?

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Thilo

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[Christian Brabandt]

Hi Thilo!

On So, 03 Jun 2012, Thilo Six wrote:

> according to ':h exists()' we can use 'exists("##ColorScheme")' to check for the
> availability of an colorscheme.
>
> :colorscheme
> desert
> :echo exists("##desert")
> 0
>
>
> ,----[  :h exists()  ]------------------------
>
> exists({expr})  The result is a Number, which is non-zero if
> {expr} is defined, zero otherwise.
> `---------------------------------------------
>
> I am pretty sure this used to work somewhen. Is this a bug or am i doing s.th.
> wrong?

You are not supposed to test a specific ColorScheme, rather whether an
event for an autocommand is supported, e.g. exist("##FileType") echoes
1, if your Vim supports the FileType autocommand.

regards,
Christian
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[Thilo Six]

Hello Christian,


Excerpt from Christian Brabandt:

> Hi Thilo!
>
> On So, 03 Jun 2012, Thilo Six wrote:
>
>> according to ':h exists()' we can use 'exists("##ColorScheme")' to check for the
>> availability of an colorscheme.
>>
>> :colorscheme
>> desert
>> :echo exists("##desert")
>> 0
>>
>>
>> ,----[  :h exists()  ]------------------------
>>
>> exists({expr})  The result is a Number, which is non-zero if
>> {expr} is defined, zero otherwise.
>> `---------------------------------------------
>>
>> I am pretty sure this used to work somewhen. Is this a bug or am i doing s.th.
>> wrong?
>
> You are not supposed to test a specific ColorScheme, rather whether an
> event for an autocommand is supported, e.g. exist("##FileType") echoes
> 1, if your Vim supports the FileType autocommand.

Then the 'Examples:' section below ':h exists()' needs to be updated.

>
> regards,
> Christian

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Thilo

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[Christian Brabandt]

Hi Thilo!

On So, 03 Jun 2012, Thilo Six wrote:

> Hello Christian,
>
>
> Excerpt from Christian Brabandt:
>
> > Hi Thilo!
> >
> > On So, 03 Jun 2012, Thilo Six wrote:
> >
> >> according to ':h exists()' we can use 'exists("##ColorScheme")' to check for the
> >> availability of an colorscheme.
> >>
> >> :colorscheme
> >> desert
> >> :echo exists("##desert")
> >> 0
> >>
> >>
> >> ,----[  :h exists()  ]------------------------
> >>
> >> exists({expr})  The result is a Number, which is non-zero if
> >> {expr} is defined, zero otherwise.
> >> `---------------------------------------------
> >>
> >> I am pretty sure this used to work somewhen. Is this a bug or am i doing s.th.
> >> wrong?
> >
> > You are not supposed to test a specific ColorScheme, rather whether an
> > event for an autocommand is supported, e.g. exist("##FileType") echoes
> > 1, if your Vim supports the FileType autocommand.
>
> Then the 'Examples:' section below ':h exists()' needs to be updated.

Well, ColorScheme is a valid autocmd event.

regards,
Christian
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[Thilo Six]

Hello Christian,


Excerpt from Christian Brabandt:
-- <snip> --
> Well, ColorScheme is a valid autocmd event.

Yes that last mail was fired to fast. Thank you for correcting me.

Then is there a possibility to check for the availability of an colorscheme
other then 'filereadable(expand(expand("~/.vim/colors/desert.vim")))' ?

>
> regards,
> Christian

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[Christian Brabandt]

Hi Thilo!

On So, 03 Jun 2012, Thilo Six wrote:

> Then is there a possibility to check for the availability of an colorscheme
> other then 'filereadable(expand(expand("~/.vim/colors/desert.vim")))' ?

Well, this should also work:

echo globpath(&rtp, 'colors/desert.vim')

regards,
Christian

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[Thilo Six]

Hello Christian,


Excerpt from Christian Brabandt:

-- <snip> --
>> Then is there a possibility to check for the availability of an colorscheme
>> other then 'filereadable(expand(expand("~/.vim/colors/desert.vim")))' ?
>
> Well, this should also work:
>
> echo globpath(&rtp, 'colors/desert.vim')

:echo globpath(&rtp, 'colors/desert.vim')
        /home/$USER/.vim/colors/desert.vim
        /usr/share/vim/vim73/colors/desert.vim

However:
:if globpath(&rtp, 'colors/desert.vim') | echo "yes" | else | echo "no" | endif
        no

I probably could write a function that ':ru colors/desert.vim' and then checks
for 'g:colors_name' being set to a specific value.
The bad about this would be it adds additional seeks of the runtimepath which i
expect to be more expensive then the above version. Therefor i stick with the
above solution.

Thank you Christian nevertheless.
>
> regards,
> Christian
>

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Thilo

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[Christian Brabandt]

Hi Thilo!

On So, 03 Jun 2012, Thilo Six wrote:

> :if globpath(&rtp, 'colors/desert.vim') | echo "yes" | else | echo "no" | endif
> no

Yeah, it returns several matches. Better would be:

:if len(globpath(&rtp, 'colors/desert.vim')) | echo "yes" | else | echo "no" | endif
     yes

regards,
Christian

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[Ben Fritz]

On Sunday, June 3, 2012 10:24:29 AM UTC-5, Christian Brabandt wrote:

> Hi Thilo!
>
> On So, 03 Jun 2012, Thilo Six wrote:
>
> > :if globpath(&rtp, 'colors/desert.vim') | echo "yes" | else | echo "no" | endif
> > no
>
> Yeah, it returns several matches. Better would be:
>
> :if len(globpath(&rtp, 'colors/desert.vim')) | echo "yes" | else | echo "no" | endif
>      yes
>

What about the empty() function, for clarity and speed?


empty({expr}) *empty()*
                Return the Number 1 if {expr} is empty, zero otherwise.
                A |List| or |Dictionary| is empty when it does not have any
                items. A Number is empty when its value is zero.
                For a long |List| this is much faster than comparing the
                length with zero.

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[Christian Brabandt]

On Mon, June 4, 2012 06:17, Ben Fritz wrote:
> On Sunday, June 3, 2012 10:24:29 AM UTC-5, Christian Brabandt wrote:
>> :if len(globpath(&rtp, 'colors/desert.vim')) | echo "yes" | else | echo
>> "no" | endif
>
> What about the empty() function, for clarity and speed?
>

Yes, that is better.

regards,
Christian


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[Thilo Six]

Hello folks,
Hello Christian,

-- <snip> --
> Then is there a possibility to check for the availability of an colorscheme
> other then 'filereadable(expand(expand("~/.vim/colors/desert.vim")))' ?

Just for the record:
What i have been looking for is actually documented below ':h :verbose'.

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Thilo

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