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" Remaps <CR> in command mode to run `nohlsearch` after accepting the command.
function! s:AddMapping()
silent! cnoremap <expr> <CR> <SID>CRAndNohlsearch()
endfunction
" Removes the Nohai <CR> cmap.
function! s:RemoveMapping()
silent! cunmap <CR>
endfunction
" Deactivates the Nohai <CR> cmap and turns off the augroup.
function! s:Deactivate()
call s:RemoveMapping()
call s:AutocmdOff()
endfunction
" Expr mapping function that runs the `nohlsearch` command after pressing <CR>.
function! s:CRAndNohlsearch()
return "\<CR>:nohlsearch\<CR>"
endfunction
" Turn on Nohai autocmds.
function! s:AutocmdOn()
augroup nohai
autocmd!
autocmd CmdlineEnter [/\?] call s:AddMapping()
autocmd CmdlineLeave [/\?] call s:Deactivate()
augroup END
endfunction
" Removes the Nohai augroup.
function! s:AutocmdOff()
autocmd! nohai
endfunction
" Expr mapping function that turns on Nohai and starts the search command
" specified by `command`, either '/' or '?'.
function! nohai#Search(command)
call s:AutocmdOn()
return a:command
endfunction
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