nvim: Drop quickui

Revert 13cea58905. This does not play well with defined color scheme and
overrides it which is annoying. The VimEnter approach mentioned did not
work, so just drop it and use preview windows as earlier.

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

nvim/.config/nvim/after/ftplugin/qf.vim

@@ -15,10 +15,30 @@ setlocal nospell
 nnoremap <buffer> [- :colder<CR>
 nnoremap <buffer> ]+ :cnewer<CR>
 nnoremap <buffer> <Leader>g :Cfilter<SPACE>
-nnoremap <buffer> p :call quickui#tools#preview_quickfix()<CR>
 
-if !empty(getloclist(0)) == 1
+nnoremap <buffer> o <CR><C-w>p
+nnoremap <silent> <buffer> p :call <SID>preview_file()<CR>
+
+let b:qf_isLoc = ! empty(getloclist(0))
+if b:qf_isLoc == 1
   nnoremap <buffer> q <CR>:lclose<CR>
 else
   nnoremap <buffer> q <CR>:cclose<CR>
 endif
+
+" Taken from https://github.com/voldikss/dotfiles
+function! s:preview_file()
+  let winwidth = &columns
+  let cur_list = b:qf_isLoc == 1 ? getloclist('.') : getqflist()
+  let cur_line = getline(line('.'))
+  let cur_file = fnameescape(substitute(cur_line, '|.*$', '', ''))
+  if cur_line =~# '|\d\+'
+    let cur_pos  = substitute(cur_line, '^\(.\{-}|\)\(\d\+\)\(.*\)', '\2', '')
+    execute 'vertical pedit +'.cur_pos.' '.cur_file
+  else
+    execute 'vertical pedit '.cur_file
+  endif
+  wincmd P
+  execute 'vert resize '.(winwidth / 2)
+  wincmd p
+endfunction

nvim/.config/nvim/init.vim

@@ -61,8 +61,6 @@ Plug 'liuchengxu/vim-which-key'
 Plug 'christoomey/vim-system-copy'
 " Toggle terminal
 Plug 'caenrique/nvim-toggle-terminal'
-" Floating preview
-Plug 'skywind3000/vim-quickui'
 " LSP
 Plug 'neovim/nvim-lsp'
 Plug 'haorenW1025/diagnostic-nvim'

nvim/.config/nvim/keymappings.vim

@@ -59,7 +59,6 @@ nnoremap L* :Glgrep! <cword><CR>
 nnoremap Ls :Glgrep!<SPACE>
 nnoremap Lt :call ToggleLocationList()<CR>
 " Preview tags
-nnoremap pf :call quickui#tools#preview_tag('')<cr>
 nnoremap pt :ptag <C-R><C-W><CR>
 nnoremap [p :ptprevious<CR>
 nnoremap ]p :ptnext<CR>