vim iskeyword for latex

Question

I am using vim. I also asked this question on vi-vim SX. I hope this question is acceptable for TeX-SX.

Context

Currently, when I set ft=tex, my set isk? reads

iskeyword=@,48-57,_,192-255

that is, the default for vim.

My "issue"

Currently, in a LaTeX string such as

$\abcde_\fgh$

the w jump would take me from the start to

1. a
2. \
3. f
4. $

Thus, the above setting does not feel very natural, nor optimal.

Indeed, it would probably be more reasonable to jump to

1. \
2. _
3. \
4. $

My attempt

I'm thinking of something more like set iskeyword=\,192-255 so as to have words consist of characters that would fit in

• natural language words
• or LaTeX commands.

Questions

1. Is it supposed to be so ? yes, since it is the default
2. What are better settings ?
3. How to properly set this variable for this filetype ?

Cheers,

Answer 1

Using @ (meaning all alphabetic characters) is advisable, then 192-255 and other utf8 accentuated characters and ligatures should be directly included.

Adding or not numbers is a personal choice — maybe convenient not to, so if you have $2ab$ and press * on ab you search for this and not 2ab.

Adding \ is probably a bad idea, because then a\alpha and a\right in a\right) will be a single word. As far as I am aware, it is not possible to add characters to iskeyword with a condition on their position in the keyword, which would solve that issue.

Finally, my settings for LaTeX are set iskeywords=@,_.