How to visually select a pattern only on current line using vimscript?

Question

I'm trying to write a vimscript function that will allow me to map a key to select a regex match on the line my cursor is on. This will help with selecting strings for use with ctags.

For example, I have the following text:

0 def hello
1   My::Fancy::Klass.call(args)
2 end

Assuming my cursor is on line 1, I would like to bind a key to select only the My::Fancy:Klass text.

I was able to achieve this like so:

nnoremap <leader>] V /\%V\(\(\u\l\+\)\+:\{2}\(\u\l\+\)\+\)\+<cr><esc>

But I would like to do the same with vimscript and am not having any luck.

Answer 1

As I mention in my comment it's not clear what you're trying to do. But I can give you an Ex command sequence (vimsript) that does the same thing as your mapping:

exec 'norm! V' | let @/ = '\v%V((\u\l+)+:{2}(\u\l+)+)+' | exec "norm! \<C-C>"

Here's how these three commands match up to your mapping:

exec 'norm! V'  ==>  V
let @/ = '\v%V((\u\l+)+:{2}(\u\l+)+)+' ==> /\%V\(\(\u\l\+\)\+:\{2}\(\u\l\+\)\+\)\+<cr>
exec "norm! \<C-C>"  ==> <esc>  (Ctrl-C and Escape do the same thing)

Even though your mapping leaves Visual mode your comment implies you want to remain in it. If that's true remove the third part:

exec 'norm! V' | let @/ = '\v%V((\u\l+)+:{2}(\u\l+)+)+'