Make nvim :terminal more consistent with vim

Vim's :terminal feels much more ergonomic, adding various mappings to
make the experience more similar, mainly by adding a few `<C-w>`
mappings for the most common actions.

Additionally, disable vim-tmux-navigators default mappings and setup
both normal and terminal mode mappings for `<C-w>{h,j,k,l}` in addition
to the normal mode mappings for `<C-{h,j,j,l}>` to make the pane
switching experience more consistent across all buffer types.

plugin/autocmds.vim

@@ -1,7 +1,7 @@
 augroup benieAugroup
   autocmd!
 
-  if $TMUX !=# ''
+  if tmux#inSession()
     " [Un]set tmux window option to detect when to change pane.
     call tmux#setNavigationFlag()
     au FocusGained * silent call tmux#setNavigationFlag()
@@ -28,4 +28,20 @@ augroup benieAugroup
 
   " Augment vim-signify by modifying it's autocmds
   au User SignifyAutocmds call do#signify()
+
+  if has('nvim')
+    " Start in terminal-insert mode.
+    autocmd TermOpen term://* startinsert
+    " Don't show the line number column in terminal-insert mode.
+    autocmd TermEnter term://* set nonumber | set norelativenumber
+    " But do show the line number column in terminal-normal mode.
+    autocmd TermLeave term://* set number | set relativenumber
+    " Automatically press enter when the terminal process exits.
+    autocmd TermClose term://*
+          \ if (expand('<afile>') !~ "fzf") &&
+          \    (expand('<afile>') !~ "ranger") &&
+          \    (expand('<afile>') !~ "coc") |
+          \   call nvim_input('<CR>') |
+          \ endif
+  endif
 augroup END

plugin/mappings.vim

@@ -5,6 +5,11 @@ nmap <leader>gt <Plug>(coc-type-definition)
 nmap <leader>sd <Plug>(coc-diagnostic-info)
 nmap <leader>gr <Plug>(coc-references)
 
+if has('nvim')
+  " Make nvim :terminal more like vim :terminal
+  tnoremap <C-w>N <C-\><C-n>
+endif
+
 " termdebug
 " TODO: Detecet if termdebug is loaded, if not do the default action.
 nnoremap <C-W><C-G> :Gdb<CR>
@@ -59,14 +64,26 @@ nnoremap k gk
 " Quick write
 nnoremap <leader>w :w!<CR>
 
-" Switch panes
-nnoremap <C-h> <C-w>h
-nnoremap <C-j> <C-w>j
-nnoremap <C-k> <C-w>k
-nnoremap <C-l> <C-w>l
-
-" Redraw window
-nnoremap <C-w>l <C-l>
+" Switch panes in a tmux aware way
+nnoremap <silent> <C-h> :TmuxNavigateLeft<CR>
+nnoremap <silent> <C-j> :TmuxNavigateDown<CR>
+nnoremap <silent> <C-k> :TmuxNavigateUp<CR>
+nnoremap <silent> <C-l> :TmuxNavigateRight<CR>
+nnoremap <silent> <C-w>h :TmuxNavigateLeft<CR>
+nnoremap <silent> <C-w>j :TmuxNavigateDown<CR>
+nnoremap <silent> <C-w>k :TmuxNavigateUp<CR>
+nnoremap <silent> <C-w>l :TmuxNavigateRight<CR>
+if has('nvim')
+  tnoremap <silent> <C-w>h <C-\><C-n>:TmuxNavigateLeft<CR>
+  tnoremap <silent> <C-w>j <C-\><C-n>:TmuxNavigateDown<CR>
+  tnoremap <silent> <C-w>k <C-\><C-n>:TmuxNavigateUp<CR>
+  tnoremap <silent> <C-w>l <C-\><C-n>:TmuxNavigateRight<CR>
+else
+  tnoremap <silent> h :TmuxNavigateLeft<CR>
+  tnoremap <silent> j :TmuxNavigateDown<CR>
+  tnoremap <silent> k :TmuxNavigateUp<CR>
+  tnoremap <silent> l :TmuxNavigateRight<CR>
+endif
 
 " Quick tabs
 nnoremap <leader>tn :tabnew<Space>

vimrc

@@ -125,6 +125,7 @@ let g:note_directory = '~/Sync/Notes'
 if !has('win32')
   " Seemless vim/tmux pane navigation
   Pack 'christoomey/vim-tmux-navigator'
+  let g:tmux_navigator_no_mappings = 1
   " Enable focus events when in tmux session
   Pack 'tmux-plugins/vim-tmux-focus-events'
 endif