How to grep only the contents of the current file?

Question

I have this alias to grep under the cursor (for the entire project):

" bind K to grep word under cursor
nnoremap K :grep! "\b<C-R><C-W>\b"<CR>:cw<CR><ENTER>

How can I change this to only grep the contents of the currently opened file?

note: My grep is linked to the silver searcher like so:

if executable('ag')
  " Use ag over grep
  let &grepprg = "ag -w"
endif

Update: How to avoid the hotkey window?

mas suggested I use fzf Blines command, which worked using this keyboard shortcut:

nnoremap L :BLines "\b<C-R><C-W>\b"<CR>

when I put the cursor on a word and type L, I get the results in a hotkey window like so:

However If I simply type the following into the command line

:BLines 

I have a much more pleasant window that appears in the middle of the screen

What is it in my keyboard shortcut that's preventing the middle screen window from appearing?

Answer 1

I would do:

nnoremap K :grep! "\b<C-R><C-W>\b" %<CR>:cw<CR><ENTER>

Remark: grep is looking into the corresponding file. If your buffer is not saved on disk the result will be puzzling. To limit the problem, at the expense of saving the file, you could add the save operation into the mapping.

nnoremap K :w<CR>:grep! "\b<C-R><C-W>\b" %<CR>:cw<CR><ENTER>

If you want not to change the file on disk but accept to temporarily change it for the sake of grep you could do:

nnoremap K :w<CR>:grep! "\b<C-R><C-W>\b" %<CR>:earlier 1f<CR>:w<CR>:later 1f<CR>:cw<CR><ENTER>

Explanation:

• :w save the file on disk to let grep analyze it
• :earlier 1f restore the buffer to the content previously saved on disk
• :w restore the content of the file
• :later 1f restore the buffer