Vim: ignore case in "f" and "t" motion commands

Question

Vim :set ignorecase command do not affect "f" and "t" motion commands in my vim config.

Is there any option or hack that makes this commands to ignore case?

Answer 1

I would suggest something like:

function! ForwardLookup()
    " get next key pressed
    let c = nr2char(getchar())
    let old_search_pattern = @/
    " Use of \V enables very-nonmagic pattern
    exec 'normal /\c\V' . escape(c, '\/') . nr2char(0x0d)
    let @/ = old_search_pattern
endfunction
nnoremap f :call ForwardLookup()<CR>

Answer 2

A basic version of this is actually in the reference manual as an example of how to use the getchar() function:

This example redefines "f" to ignore case:

:nmap f :call FindChar()<CR>
:function FindChar()
:  let c = nr2char(getchar())
:  while col('.') < col('$') - 1
:    normal l
:    if getline('.')[col('.') - 1] ==? c
:      break
:    endif
:  endwhile
:endfunction

See :help getchar().

You'll need to save the character returned and write a similar map for ; if you want that to work too, and write code to handle v:count1 if you want it to work with counts.