Re: Packages

2016-03-04 14:55 GMT+03:00 LCD 47 <lcd047@gmail.com>:
> On 4 March 2016, Nikolay Aleksandrovich Pavlov <zyx.vim@gmail.com> wrote:
>> 2016-03-04 14:25 GMT+03:00 LCD 47 <lcd047@gmail.com>:
>> > On 3 March 2016, Bram Moolenaar <Bram@moolenaar.net> wrote:
>> > [...]
>> >> I realize several people who have previously been using Pathogen
>> >> are confused. Perhaps we can just put every directory under
>> >> "pack/*/ever" in 'runtimepath'?
>> >
>> > A tangentially related question. Assume I need to check that
>> > a plugin named "foo" is installed and enabled. Assume also "foo"
>> > contains
>>
>> If you need to check that it is installed and *enabled* then you
>> should not do anything you are not already doing.
>
> So if
>
> globpath(&runtimepath, "autoload/foo.vim", 1) != ""
>
> returns true, I can assume "foo" is installed and enabled?

Yes. Though if you can it is probably better to wrap the function calls into

function s:CallFooBar(...)
try
return call('foo#bar', a:000)
catch /^Vim(return):E117:/
return 0
endtry
endfunction

: I sometimes saw and have developed plugin lazy loader which uses
FuncUndefined event to load a plugin. Even with the hacks I know such
loaders are only fully compatible with [EAFP][1] approach (my lazy
loader also throws some strange errors, so it is not yet in VAM
master; and in any case I never had plans to enable it by default).

This, of course, means that you are assumed to handle absence of
foo#bar where you need it, not base any decisions on prelimitary
checks.

[1]: https://docs.python.org/3/glossary.html#term-eafp


>
>> Problem is that with "just put every directory under pack/*/ever"
>> you probably will not be able to do this from the vimrc: rationale is
>> that
>>
>> 1. Putting should be automatic.
>> 2. Yet user settings regarding where "pack" is should be respected.
>>
>> So "just put" should be done somewhere between "load vimrc" and "load
>> plugins" initialization stages.
>
> I'm trying to write a plugin that happens to need "foo", not a
> plugin manager. I don't want to install "foo" if it's missing, I just
> want to know if I can call "foo#bar()". Checking for the function
> itself is not reliable:
>
> exists("*foo#bar")
>
> returns false if the corresponding autoload file is not already loaded.
> I also don't want to load the file just to make sure I can use the
> function at some later point in time.
>
> /lcd
>
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