Re: Determine vim feature size (tiny, small, normal, etc.) in vimscript

On 03/12/13 20:00, So8res wrote:
> I would like to, in vimscript, determine whether vim was compiled as 'tiny'.
>
> Specifically, I would like to determine the message history size (20 or 200, according as vim is tiny or larger) in vimscript.
>
> Is there any way I can do this? Is there some feature I can check using has() to see how large the message history is? I browsed through the feature-list help docs and did not see one.
>
> I know that I can check has('+visual') or has('+windows') or some other feature that is in small but not tiny, but this is not quite accurate: It's possible to compile --with-features=tiny --enable-visual --enable-windows.
>
One problem which invalidates some of the replies given so far, is that
normally _neither_ Small _nor_ Tiny builds have expression evaluation
built in.

This means that an :if statement, up to the corresponding :endif, and
with any :elseif and :else in between, is treated as a nestable comment.
_Both_ the "true" path and the "else" path will be skipped. Any
expression, any :let statement, etc., appearing *outside* the range of
an :if (and also not commented-out by a single double-quote character)
will trigger an error in _both_ Small and Tiny builds.

For instance,

if 1
DoSomething
else
DoNothing
endif

(where :DoSomething and :DoNothing are predefined user-commands) will
never execute :DoNothing, but in _either_ a Small or a Tiny build it
won't execute :DoSomething either: the _whole_ :if statement (including
any :if nested inside it) will be skipped.

(The above is, maybe in somewhat more detailed language, essentially
what is documented at ":help no-eval-feature". See also ":help +eval".)

You can apparently use :redir even in Tiny builds, to save the output of
:version to a register or a file; but you cannot check the result by
means of an :if… You will probably have to do a :substitute on the file
or register (after reading or copying it into a buffer), but even so you
can not even count the number of occurrences of the word "Tiny" (i.e. of
the regexp /\<Tiny\>/ ) since any _counting_ (followed by :if) would
require expression evaluation… I suppose you will have to _assume_ some
featureset, and then write your code in such a way that any smaller
featureset would error out. Ugly, I know; but for the love of me I can't
come out with anything better.


Best regards,
Tony.
--
Yow! Is this sexual intercourse yet?? Is it, huh, is it??

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