nvim: init.vim: Miscellaneous cleanups

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

nvim/init.vim

@@ -18,8 +18,6 @@ Plug 'bling/vim-airline'
 Plug 'airblade/vim-gitgutter'
 " Manage Project sessions
 Plug 'thaerkh/vim-workspace'
-" Explore filesystem
-Plug 'scrooloose/nerdtree'
 " Commenter
 Plug 'scrooloose/nerdcommenter'
 " Theme
@@ -74,15 +72,24 @@ Plug 'vim-erlang/vim-erlang-compiler'
 " Miscellaneous
 Plug 'tpope/vim-surround'
 Plug 'tpope/vim-repeat'
-Plug 'editorconfig/editorconfig-vim'
 Plug 'tpope/vim-eunuch'
+Plug 'tpope/vim-sleuth'
+Plug 'tpope/vim-vinegar'
+Plug 'editorconfig/editorconfig-vim'
 Plug 'vim-utils/vim-man'
 Plug 'unblevable/quick-scope'
 Plug 'igankevich/mesonic'
 Plug 'rhysd/vim-clang-format', { 'for': [ 'c', 'cpp'] }
-Plug 'adelarsq/vim-matchit'
 Plug 'stefandtw/quickfix-reflector.vim'
 Plug 'yuttie/comfortable-motion.vim'
+Plug 'lifecrisis/vim-difforig'
+Plug 'dag/vim-fish'
+Plug 'pbrisbin/vim-syntax-shakespeare'
+Plug 'zenzike/vim-haskell-unicode'
+Plug 'lifepillar/pgsql.vim'
+Plug 'purescript-contrib/purescript-vim'
+Plug 'mbbill/undotree'
+Plug 'airblade/vim-rooter'
 
 " Initialize plugin system
 call plug#end()
@@ -102,7 +109,6 @@ set exrc                " Allow loading local .nvimrc files
 set secure              " Disallow use of autocmd, shell and write in local rc
 set showcmd             " Show (partial) command in status line.
 set showmatch           " Show matching brackets.
-set showmode            " Show current mode.
 set ruler               " Show the line and column numbers of the cursor.
 set number              " Show the line numbers on the left side.
 set formatoptions+=o    " Continue comment marker in new lines.
@@ -118,11 +124,18 @@ set noerrorbells        " No beeps.
 set modeline            " Enable modeline.
 set linespace=0         " Set line-spacing to minimum.
 set nojoinspaces        " Prevents inserting two spaces after punctuation on a join (J)
+set noshowmode          " Because of neovim's cursor shape
 set splitbelow          " Horizontal split below current.
 set splitright          " Vertical split to right of current.
 set nobackup            " no backup files
 set nowritebackup       " only in case you don't want a backup file while editing
 set noswapfile          " no swap files
+set foldmethod=syntax   " Create folds based on files syntax
+set nofoldenable        " Open folds by default
+
+" Wild menu
+set wildmenu
+set wildmode=list:longest,full
 set wildoptions=pum
 set pumblend=30
 
@@ -172,12 +185,6 @@ nnoremap Q <Nop>
 nnoremap <Leader>pg :PlugUpgrade<CR>
 nnoremap <Leader>pd :PlugUpdate<CR>
 nnoremap <Leader>pc :PlugClean<CR>
-" NerdTree
-nnoremap <Leader>ee :NERDTreeVCS<CR>
-nnoremap <Leader>ef :NERDTreeFind<CR>
-nnoremap <Leader>eo :NERDTreeFocus<CR>
-nnoremap <Leader>ec :NERDTreeClose<CR>
-nnoremap <Leader>et :NERDTreeToggle<CR>
 " For skim
 nnoremap <Leader>vf  :Files<CR>
 nnoremap <Leader>vg  :GFiles<CR>
@@ -193,6 +200,8 @@ nnoremap <Leader>vsh :History/<CR>
 " Use ripgrep to search for content in files
 nnoremap <Leader>/ :Rg<CR>
 nnoremap <Leader>b :ls<CR>:b<Space>
+" Undo tree
+nnoremap <Leader>u :UndotreeToggle<CR>
 " Save
 nnoremap <Leader>w <Esc>:w<CR>
 " Search and Replace
@@ -303,6 +312,13 @@ autocmd FileType scheme nnoremap <buffer> <Leader>re :normal mscpaF<cr>`s
 " Evaluates the entire file.
 autocmd FileType scheme nnoremap <buffer> <Leader>rf :normal msggcpG<cr>`s
 
+" Toggles search highlighting off/on according to current mode. Source: http://blog.sanctum.geek.nz/vim-search-highlighting/
+augroup ToggleSearchHighlighting
+	autocmd!
+	autocmd InsertEnter * setlocal nohlsearch
+	autocmd InsertLeave * setlocal hlsearch
+augroup END
+
 let g:haskell_enable_quantification = 1   " to enable highlighting of `forall`
 let g:haskell_enable_recursivedo = 1      " to enable highlighting of `mdo` and `rec`
 let g:haskell_enable_arrowsyntax = 1      " to enable highlighting of `proc`
@@ -404,7 +420,7 @@ let g:SuperTabDefaultCompletionType = "<c-n>"
 let g:workspace_session_directory = $HOME . '/.vim/session/'
 let g:workspace_undodir = $HOME . '/.vim/undodir'
 let g:workspace_autosave = 0
-let g:workspace_autosave_ignore = ['gitcommit', 'qf', 'nerdtree', 'tagbar']
+let g:workspace_autosave_ignore = ['gitcommit', 'qf', 'tagbar']
 " For comfortable motion
 let g:comfortable_motion_scroll_down_key = "j"
 let g:comfortable_motion_scroll_up_key = "k"