Re: what does iskeyword option do?

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.

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