nvim: Add support for Vista

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

nvim/.config/nvim/init.vim

@@ -91,6 +91,7 @@ Plug 'tpope/vim-sleuth'
 Plug 'tpope/vim-vinegar'
 Plug 'wellle/targets.vim'
 Plug 'Yggdroot/indentLine'
+Plug 'liuchengxu/vista.vim'
 Plug 'autozimu/LanguageClient-neovim', { 'branch': 'next', 'do': 'bash install.sh' }
 " Miscellaneous
 Plug 'editorconfig/editorconfig-vim'
@@ -654,6 +655,17 @@ let g:LanguageClient_serverCommands = {
             \ 'python': ['pyls'],
             \ }
 
+" Vista
+let g:vista_executive_for = {
+            \ 'c': 'ctags',
+            \ 'haskell': 'lcn',
+            \ 'rust': 'lcn',
+            \ 'python': 'lcn',
+            \ }
+let g:vista_ctags_cmd = {
+            \ 'haskell': 'stack exec -- hasktags -x -o - -c',
+            \ }
+
 " ----------------------------- Functions ------------------------------------
 function! NvimGdbNoTKeymaps()
   tnoremap <silent> <buffer> <Esc> <C-\><C-n>