nvim: init.vim: Integrate cscope & fzf

Since we can load results of cscope in fzf we no longer
need quickfix & cscope integration.

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

nvim/init.vim

@@ -42,7 +42,6 @@ Plug 'vim-utils/vim-husk'
 " Tags
 Plug 'steffanc/cscopemaps.vim'
 Plug 'ludovicchabant/vim-gutentags'
-Plug 'sk1418/QFGrep'
 " GDB
 Plug 'sakhnik/nvim-gdb', { 'do': ':UpdateRemotePlugins' }
 " Lisp
@@ -161,7 +160,7 @@ nnoremap <Leader>/ :Rg<CR>
 " Save
 nnoremap <Leader>w <Esc>:w<CR>
 " Search and Replace
-nmap <Leader>s :%s//g<Left><Left>
+nnoremap <Leader>sr :%s//g<Left><Left>
 " Quit
 nnoremap <Leader>q <Esc>:q<CR>
 " Search for the word under cursor
@@ -180,7 +179,6 @@ nnoremap <Leader>gp :Git! push<CR>
 nnoremap <Leader>gu :Git! push -u
 nnoremap <Leader>gr :Git! remote -v<CR>
 " For Cscope
-nnoremap <Leader>cu :!cscope -Rbq<CR>
 nnoremap <Leader>cr :cs reset<CR>
 
 " Quickfix
@@ -371,23 +369,6 @@ autocmd BufRead,BufNewFile */pulseaudio/*.[ch] set et sw=4 tw=128
 " Spell Checking
 autocmd BufRead,BufNewFile *.md,*.txt setlocal spell spelllang=en_uk
 
-" For CScope and Quickfix
-" https://medium.com/@lakshmankumar12/quickfix-and-location-list-in-vim-ca0292ac894d
-" https://medium.com/@lakshmankumar12/vim-and-cscope-5f4558c8a8b8
-function! LoadCscopeToQuickFix(currword, oper)
-  execute "normal mZ"
-  execute "set csqf=" . a:oper . "-"
-  execute "lcs find " a:oper . " " . a:currword
-  execute "lopen"
-  execute "wincmd p"
-  execute "normal `Z"
-  execute "set csqf="
-endfunction
-
-nnoremap <Leader>css  <Esc>:call LoadCscopeToQuickFix(expand("<cword>"),"s")<CR>
-nnoremap <Leader>csg  <Esc>:call LoadCscopeToQuickFix(expand("<cword>"),"g")<CR>
-nnoremap <Leader>csc  <Esc>:call LoadCscopeToQuickFix(expand("<cword>"),"c")<CR>
-
 " For swoop
 let g:swoopUseDefaultKeyMap = 0
 let g:swoopPatternSpaceInsertsWildcard = 0
@@ -398,3 +379,75 @@ nmap <Leader>os :call Swoop()<CR>
 vmap <Leader>os :call SwoopSelection()<CR>
 nmap <Leader>om :call SwoopMulti()<CR>
 vmap <Leader>om :call SwoopMultiSelection()<CR>
+
+" CScope & fzf integration
+" Taken from https://gist.github.com/amitab/cd051f1ea23c588109c6cfcb7d1d5776
+" However, the above gist has completely wrong mappings
+function! Cscope(option, query)
+  let color = '{ x = $1; $1 = ""; z = $3; $3 = ""; printf "\033[34m%s\033[0m:\033[31m%s\033[0m\011\033[37m%s\033[0m\n", x,z,$0; }'
+  let opts = {
+  \ 'source':  "cscope -dL" . a:option . " " . a:query . " | awk '" . color . "'",
+  \ 'options': ['--ansi', '--prompt', '> ',
+  \             '--multi', '--bind', 'alt-a:select-all,alt-d:deselect-all',
+  \             '--color', 'bw'],
+  \ 'down': '40%'
+  \ }
+  function! opts.sink(lines)
+    let data = split(a:lines)
+    let file = split(data[0], ":")
+    execute 'e ' . '+' . file[1] . ' ' . file[0]
+  endfunction
+  call fzf#run(opts)
+endfunction
+
+function! CscopeQuery(option)
+  call inputsave()
+  if a:option == '9'
+    let query = input('Assignments to: ')
+  elseif a:option == '3'
+    let query = input('Functions calling: ')
+  elseif a:option == '2'
+    let query = input('Functions called by: ')
+  elseif a:option == '6'
+    let query = input('Egrep: ')
+  elseif a:option == '7'
+    let query = input('File: ')
+  elseif a:option == '1'
+    let query = input('Definition: ')
+  elseif a:option == '8'
+    let query = input('Files #including: ')
+  elseif a:option == '0'
+    let query = input('C Symbol: ')
+  elseif a:option == '4'
+    let query = input('Text: ')
+  else
+    echo "Invalid option!"
+    return
+  endif
+  call inputrestore()
+  if query != ""
+    call Cscope(a:option, query)
+  else
+    echom "Cancelled Search!"
+  endif
+endfunction
+
+nnoremap <silent> <Leader>ss :call Cscope('0', expand('<cword>'))<CR>
+nnoremap <silent> <Leader>sg :call Cscope('1', expand('<cword>'))<CR>
+nnoremap <silent> <Leader>sd :call Cscope('2', expand('<cword>'))<CR>
+nnoremap <silent> <Leader>sc :call Cscope('3', expand('<cword>'))<CR>
+nnoremap <silent> <Leader>st :call Cscope('4', expand('<cword>'))<CR>
+nnoremap <silent> <Leader>se :call Cscope('6', expand('<cword>'))<CR>
+nnoremap <silent> <Leader>sf :call Cscope('7', expand('<cword>'))<CR>
+nnoremap <silent> <Leader>si :call Cscope('8', expand('<cword>'))<CR>
+nnoremap <silent> <Leader>sa :call Cscope('9', expand('<cword>'))<CR>
+
+nnoremap <silent> <Leader><Leader>ss :call CscopeQuery('0')<CR>
+nnoremap <silent> <Leader><Leader>sg :call CscopeQuery('1')<CR>
+nnoremap <silent> <Leader><Leader>sd :call CscopeQuery('2')<CR>
+nnoremap <silent> <Leader><Leader>sc :call CscopeQuery('3')<CR>
+nnoremap <silent> <Leader><Leader>st :call CscopeQuery('4')<CR>
+nnoremap <silent> <Leader><Leader>se :call CscopeQuery('6')<CR>
+nnoremap <silent> <Leader><Leader>sf :call CscopeQuery('7')<CR>
+nnoremap <silent> <Leader><Leader>si :call CscopeQuery('8')<CR>
+nnoremap <silent> <Leader><Leader>sa :call CscopeQuery('9')<CR>