Show / hide horizontal scrollbar depending on “wrap” option

Question

I'm trying to show / hide horizontal scrollbar conditionally, depending on wrap option:

• with wrap - show horizontal scrollbar
• with nowrap - hide

Here is what I tried, but for some reason it doesn't work:

set guioptions+=%{&wrap?'b':''}

Answer 1

I guess you want the horizontal scrollbar on nowrap. You can handle this with a autocmd, like:

autocmd OptionSet wrap if &wrap|set guioptions-=b|else|set guioptions+=b|endif

If you change the option wrap during runtime, this will automatically switch on/off the horizontal scrollbar. The autocommand is not triggered on startup (sourcing vimrc), see :help OptionSet.

In your vimrc, you should define your initial settings like:

set nowrap
...
if &wrap
    set guioptions-=b
else
    set guioptions+=b
endif

This way, you just need to change wrap and guioptions will be changed as needed. Order is important here.