nvim: Switch to QF for cscope

While we have gone back and forth between quickfix and fzf for cscope,
it makes sense for cscope results to be loaded in quickfix window.
Results loaded in fzf window will disappear once selected since that's
how fuzzy finding is used but we do not want to have that behaviour with
results of tools like cscope. Also use a plugin this time instead of
having our own function. The plugin also provides the added advantage of
jumping to a global definition instead of even opening that in a window.

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

nvim/.config/nvim/init.vim

@@ -41,8 +41,6 @@ Plug 'rbong/vim-flog'
 Plug 'whiteinge/diffconflicts'
 " For tmux yank
 Plug 'vim-utils/vim-husk'
-" Tags
-Plug 'steffanc/cscopemaps.vim', { 'for': 'c' }
 " GDB
 Plug 'sakhnik/nvim-gdb', { 'do': ':UpdateRemotePlugins' }
 " Lisp
@@ -84,6 +82,7 @@ Plug 'sbdchd/neoformat'
 Plug 'neomake/neomake'
 " Quickfix
 Plug 'sk1418/QFGrep'
+Plug 'ronakg/quickr-cscope.vim'
 Plug 'stefandtw/quickfix-reflector.vim'
 " Absolute essentials miscellaneous
 Plug 'tpope/vim-surround'
@@ -405,25 +404,17 @@ augroup c_maps
 	au FileType c nmap <LocalLeader>cu :NeomakeSh cscope -bqR<CR>
 	au FileType c nmap <LocalLeader>cr :cs reset<CR>
 
-	au FileType c nmap <silent> <LocalLeader>s :call Cscope('0', expand('<cword>'))<CR>
+	au FileType c nmap <silent> <LocalLeader>s  <Plug>(quickr_cscope_symbols)
-	au FileType c nmap <silent> <LocalLeader>g :call Cscope('1', expand('<cword>'))<CR>
+	au FileType c nmap <silent> <LocalLeader>g  <Plug>(quickr_cscope_global)
-	au FileType c nmap <silent> <LocalLeader>d :call Cscope('2', expand('<cword>'))<CR>
+	au FileType c nmap <silent> <LocalLeader>h  <Plug>(quickr_cscope_global_split)
-	au FileType c nmap <silent> <LocalLeader>c :call Cscope('3', expand('<cword>'))<CR>
+	au FileType c nmap <silent> <LocalLeader>v  <Plug>(quickr_cscope_global_vert_split)
-	au FileType c nmap <silent> <LocalLeader>t :call Cscope('4', expand('<cword>'))<CR>
+	au FileType c nmap <silent> <LocalLeader>d  <Plug>(quickr_cscope_functions)
-	au FileType c nmap <silent> <LocalLeader>e :call Cscope('6', expand('<cword>'))<CR>
+	au FileType c nmap <silent> <LocalLeader>c  <Plug>(quickr_cscope_callers)
-	au FileType c nmap <silent> <LocalLeader>f :call Cscope('7', expand('<cword>'))<CR>
+	au FileType c nmap <silent> <LocalLeader>t  <Plug>(quickr_cscope_text)
-	au FileType c nmap <silent> <LocalLeader>i :call Cscope('8', expand('<cword>'))<CR>
+	au FileType c nmap <silent> <LocalLeader>e  <Plug>(quickr_cscope_egrep)
-	au FileType c nmap <silent> <LocalLeader>a :call Cscope('9', expand('<cword>'))<CR>
+	au FileType c nmap <silent> <LocalLeader>f  <Plug>(quickr_cscope_files)
-
+	au FileType c nmap <silent> <LocalLeader>i  <Plug>(quickr_cscope_includes)
-	au FileType c nmap <silent> <LocalLeader><LocalLeader>s :call CscopeQuery('0')<CR>
+	au FileType c nmap <silent> <LocalLeader>a  <Plug>(quickr_cscope_assignments)
-	au FileType c nmap <silent> <LocalLeader><LocalLeader>g :call CscopeQuery('1')<CR>
-	au FileType c nmap <silent> <LocalLeader><LocalLeader>d :call CscopeQuery('2')<CR>
-	au FileType c nmap <silent> <LocalLeader><LocalLeader>c :call CscopeQuery('3')<CR>
-	au FileType c nmap <silent> <LocalLeader><LocalLeader>t :call CscopeQuery('4')<CR>
-	au FileType c nmap <silent> <LocalLeader><LocalLeader>e :call CscopeQuery('6')<CR>
-	au FileType c nmap <silent> <LocalLeader><LocalLeader>f :call CscopeQuery('7')<CR>
-	au FileType c nmap <silent> <LocalLeader><LocalLeader>i :call CscopeQuery('8')<CR>
-	au FileType c nmap <silent> <LocalLeader><LocalLeader>a :call CscopeQuery('9')<CR>
 augroup END
 
 augroup rust_maps
@@ -456,10 +447,14 @@ augroup toggle_search
 	autocmd InsertLeave * setlocal hlsearch
 augroup END
 
-" Close QF window if it is last window
+augroup quickfix
-augroup quickfix_close
 	au!
+    " Close QF window if it is last window
 	au WinEnter * if winnr('$') == 1 && &buftype == "quickfix"|q|endif
+    " Existing bindings for QFGrep
+    " <Leader>g input pattern to do further filtering
+    " <Leader>v input pattern to do further inverted filtering
+    " <Leader>r restore the Quickfix/location list with original entries
 augroup END
 
 augroup terminal_job
@@ -662,64 +657,17 @@ let g:psc_ide_auto_imports = 1
 
 " FZF
 let g:fzf_mru_no_sort = 1
+let $FZF_DEFAULT_OPTS='--layout=reverse'
+let g:fzf_layout = { 'window': 'call CreateCentredFloatingWindow()' }
+
+" Quickr
+let g:quickr_cscope_keymaps = 0
 
 " ----------------------------- Functions ------------------------------------
-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', 'info:144,prompt:161,spinner:135,pointer:135,marker:118',
-                \             '--color', 'fg:252,bg:233,hl:67,fg+:252,bg+:235,hl+:81'],
-                \ 'window': 'call CreateCentredFloatingWindow()'
-                \ }
-    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 == '0'
-		let query = input('C Symbol: ')
-	elseif a:option == '1'
-		let query = input('Definition: ')
-	elseif a:option == '2'
-		let query = input('Functions called by: ')
-	elseif a:option == '3'
-		let query = input('Functions calling: ')
-	elseif a:option == '4'
-		let query = input('Text: ')
-	elseif a:option == '6'
-		let query = input('Egrep: ')
-	elseif a:option == '7'
-		let query = input('File: ')
-	elseif a:option == '8'
-		let query = input('Files #including: ')
-	elseif a:option == '9'
-		let query = input('Assignments to: ')
-	else
-		echo "Invalid option!"
-		return
-	endif
-	call inputrestore()
-	if query != ""
-		call Cscope(a:option, query)
-	else
-		echom "Cancelled Search!"
-	endif
-endfunction
-
 function! NvimGdbNoTKeymaps()
   tnoremap <silent> <buffer> <Esc> <C-\><C-n>
 endfunction
 
-let $FZF_DEFAULT_OPTS='--layout=reverse'
-let g:fzf_layout = { 'window': 'call CreateCentredFloatingWindow()' }
 " Stolen from https://github.com/camspiers/dotfiles/blob/master/files/.config/nvim/init.vim
 function! CreateCentredFloatingWindow()
 	let width = float2nr(&columns * 0.8)