setup neovim and tmux to both use ctrl+[hjkl] for split navigation

nvim/.config/nvim/init.lua

@@ -40,6 +40,7 @@ require("lazy").setup({
 	require("plugins.neo-tree"),
 	require("plugins.telescope"),
 	require("plugins.treesitter"),
+	require("plugins.vim-tmux-navigation"),
 	{ "catppuccin/nvim", name = "catppuccin", priority = 1000 },
 })
 

nvim/.config/nvim/lua/plugins/vim-tmux-navigation.lua

@@ -0,0 +1,18 @@
+return {
+  "christoomey/vim-tmux-navigator",
+  cmd = {
+    "TmuxNavigateLeft",
+    "TmuxNavigateDown",
+    "TmuxNavigateUp",
+    "TmuxNavigateRight",
+    "TmuxNavigatePrevious",
+    "TmuxNavigatorProcessList",
+  },
+  keys = {
+    { "<c-h>",  "<cmd><C-U>TmuxNavigateLeft<cr>" },
+    { "<c-j>",  "<cmd><C-U>TmuxNavigateDown<cr>" },
+    { "<c-k>",  "<cmd><C-U>TmuxNavigateUp<cr>" },
+    { "<c-l>",  "<cmd><C-U>TmuxNavigateRight<cr>" },
+    { "<c-\\>", "<cmd><C-U>TmuxNavigatePrevious<cr>" },
+  },
+}

tmux/.config/tmux/keymaps.conf

@@ -14,18 +14,30 @@ bind-key -n M-S-Right swap-window -t +1 -d
 #bind-key -n M-S-Right move-window -a -s +0 -t +1
 
 # pane navigation
-bind -n M-h select-pane -L
-bind -n M-j select-pane -D
-bind -n M-k select-pane -U
-bind -n M-l select-pane -R
+bind -n M-j swap-pane -D
+bind -n M-k swap-pane -U
 
-bind -n M-n swap-pane -D
-bind -n M-p swap-pane -U
+# 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|l?n?vim?x?|fzf)(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'"
 
-unbind x
-bind x kill-pane -t +0
+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
 
-# keymaps for splitting
+# keymaps for working with split windows
 bind v split-pane -v -c "#{pane_current_path}"
 bind h split-pane -h -c "#{pane_current_path}"
 bind b break-pane
@@ -36,6 +48,9 @@ bind -n M-F1 select-layout even-horizontal
 bind -n M-F2 select-layout main-vertical
 bind -n M-F3 select-layout tiled
 
+unbind x
+bind x kill-pane -t +0
+
 # detach current session and close terminal
 bind k run "tmux detach -P"