[tmux/vim] Use vim-tmux-navigator for seemless navigation between vim splits and tmux panes.

.tmux.conf

@@ -11,11 +11,25 @@ set-option -g renumber-windows on
 # see https://github.com/neovim/neovim/wiki/FAQ#esc-in-tmux-or-gnu-screen-is-delayed
 set -sg escape-time 0
 
-# vim keys for switching between panes
-bind-key -r k select-pane -U
-bind-key -r j select-pane -D
-bind-key -r h select-pane -L
-bind-key -r l select-pane -R
+# Smart pane switching with awareness of Vim splits.
+# See: https://github.com/christoomey/vim-tmux-navigator
+is_vim="ps -o state= -o comm= -t '#{pane_tty}' \
+    | grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(view|n?vim?x?)(diff)?$'"
+bind-key -n 'C-h' if-shell "$is_vim" 'send-keys C-h'  'select-pane -L'
+bind-key -n 'C-j' if-shell "$is_vim" 'send-keys C-j'  'select-pane -D'
+bind-key -n 'C-k' if-shell "$is_vim" 'send-keys C-k'  'select-pane -U'
+bind-key -n 'C-l' if-shell "$is_vim" 'send-keys C-l'  'select-pane -R'
+tmux_version='$(tmux -V | sed -En "s/^tmux ([0-9]+(.[0-9]+)?).*/\1/p")'
+if-shell -b '[ "$(echo "$tmux_version < 3.0" | bc)" = 1 ]' \
+    "bind-key -n 'C-\\' if-shell \"$is_vim\" 'send-keys C-\\'  'select-pane -l'"
+if-shell -b '[ "$(echo "$tmux_version >= 3.0" | bc)" = 1 ]' \
+    "bind-key -n 'C-\\' if-shell \"$is_vim\" 'send-keys C-\\\\'  'select-pane -l'"
+
+bind-key -T copy-mode-vi 'C-h' select-pane -L
+bind-key -T copy-mode-vi 'C-j' select-pane -D
+bind-key -T copy-mode-vi 'C-k' select-pane -U
+bind-key -T copy-mode-vi 'C-l' select-pane -R
+bind-key -T copy-mode-vi 'C-\' select-pane -l
 
 # vim mode keys in copy-mode
 set-window-option -g mode-keys vi

.vimrc

@@ -24,6 +24,9 @@ call plug#begin('~/.vim/plugged')
     " Send code to REPL
     Plug 'jpalardy/vim-slime'
 
+    " Seemless vim/tmux navigation
+    Plug 'christoomey/vim-tmux-navigator'
+
     if has('nvim')
         " LSP helpers
         Plug 'neovim/nvim-lspconfig'
@@ -79,11 +82,6 @@ call plug#end()
 :set tabstop=4 softtabstop=4 shiftwidth=4 expandtab smarttab autoindent "Nicer tab actions
 "Highlight without moving
 :nnoremap * *``
-"Move aroung splits without the C-W prefix
-:nnoremap <C-J> <C-W><C-J>
-:nnoremap <C-K> <C-W><C-K>
-:nnoremap <C-L> <C-W><C-L>
-:nnoremap <C-H> <C-W><C-H>
 "Easier fzf keybindings
 :nnoremap <C-F> :Rg!<CR>
 :nnoremap <expr> <C-P> (len(system('git rev-parse')) ? ':Files!' : ':GFiles!')."<CR>"