Re: what does iskeyword option do?

On Wednesday, February 25, 2015 at 2:03:40 PM UTC-5, Charles Campbell wrote:
> FlashBurn wrote:
> > On Wednesday, February 25, 2015 at 11:31:36 AM UTC-5, Tim Chase wrote:
> >> On 2015-02-25 08:02, FlashBurn wrote:
> >>> I'm trying to understand the meaning of 'iskeyword' option but I
> >>> can't figure out from the help what it does. Any help in finding
> >>> out of the meaning of this option is greatly appreciated.
> >> 'isk' contains a list of characters (or character-ranges) for those
> >> characters that should be considered a "word". This comes into play
> >> when using "\<", "\>", "\k" and "\K" in a regular expression; what
> >> gets considered when you use "*" and "#" to search; what the "iw" and
> >> "aw" text-objects select; what's considered a "w"ord motion; how
> >> abbreviations are found; and plenty of other places.
> >>
> >> For example, by default "-" isn't part of the 'isk' setting, but if
> >> you wanted "vip" to highlight/select whole CSS selectors like
> >> "background-color"
> >>
> >> :set isk+=-
> >>
> >> to add the dash. Now, if you do "viw" anywhere in the attribute,
> >> it will highlight/select the entire "background-color" not just
> >> "background" or "color".
> >>
> >> It's a little tricky to add certain characters as they have special
> >> meaning. The easiest way I've found is to make a range of length one
> >> for "@":
> >>
> >> :set isk+=@-@ " add an at-sign, good for email addresses
> >> " and Python decorators
> >>
> >> -tim
> > I was trying to understand if it has a meaning in the highlight context. I'm going through an online book, Learn Vimscript the Hard Way and in the following chapter, http://learnvimscriptthehardway.stevelosh.com/chapters/46.html, it talks about the # symbol not being in iskeyword in the context of comments and highlighting and I can't figure out why this matters. I think I'm getting the meaning of this option, i.e. it defines what a word is, but why it matters in highlighting, that is not clear to me.
> >
> Syntax highlighting is based upon regular expressions (see :he regexp).
> A commonly used thing to pick up on are: words. Most variables,
> function names, and commands, for example, fit into the description of
> "word". Hence, the scripts that specify syntax highlighting often use
> the \k atom (see :help /character-classes); and the \k atom depends upon
> the iskeyword setting. For example, syntax/latex.vim (by default)
> removes the underscore from the iskeyword option because latex will
> (usually) flag usage of it as an error.
>
> Regards,
> Chip Campbell

Thanks a lot Chip. That cleared it up.

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