On 11/03/11 13:07, Axel Bender wrote:
Sometimes it's necessary to determine whether a given character belongs to
one of the options whose names are reflected by the above (suggested)
function names. Though it's possible to write those functions in vim
itself, one would either have to call such a function "manually" a) after a
change to the respective option value (e.g. set iskeyword+=#), or b) before
every check for containedness in the option value.
As vim tracks the option values internally, it should be no big deal to
provide such functions.
Those would be written as something like
function Iskeywordchar(c)
return a:c=~'\k'
endfunction
function Isfnamechar(c)
return a:c=~'\f'
endfunction
function Isprintchar(c)
return a:c=~'\p'
endfunction
function Isidentchar(c)
return a:c=~'\w'
endfunction
Since they're so trivial, I don't expect they'd make it into core
Vim as functions. The added advantage of using the "=~" notation
is that it can work for any pattern. Say you want to check for a
valid C identifier. If you just ask whether a *character* is a
valid C-identifier character with the "Isidentchar()" above, it
will return true for "4", and if you change it to "\h", then a
scan of characters in a valid identifier such as "Street2" will
fail on "2". Using the "=~", you can simply test
... my_var=~'\h\w*' ...
and it catches all the right cases.
So you'll want to read up at
:help /\i " and following
:h =~
and see how much more power Vim already puts in your hands :)
-tim
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