From 701bd244be7e444928b59388099059257906cd92 Mon Sep 17 00:00:00 2001
From: Sanchayan Maity <sanchayan@sanchayanmaity.net>
Date: Fri, 25 Mar 2022 18:02:38 +0530
Subject: [PATCH] Allow seamless navigation between vim and tmux splits

---
 .gitmodules                           |  3 +++
 nvim/.config/nvim/init.lua            |  5 +++++
 nvim/.config/nvim/lua/keymappings.lua | 13 ++++++++++---
 nvim/.config/nvim/lua/plugins.lua     |  1 +
 tmux/.tmux.conf                       | 25 ++++++++++++++++++++-----
 tmux/.tmux/plugins/vim-tmux-navigator |  1 +
 6 files changed, 40 insertions(+), 8 deletions(-)
 create mode 160000 tmux/.tmux/plugins/vim-tmux-navigator

diff --git a/.gitmodules b/.gitmodules
index 59b2e18..1bf7c59 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -19,3 +19,6 @@
 [submodule "tmux/.tmux/plugins/tmux-cmd-capture"]
 	path = tmux/.tmux/plugins/tmux-cmd-capture
 	url = https://github.com/artemave/tmux_capture_last_command_output.git
+[submodule "tmux/.tmux/plugins/vim-tmux-navigator"]
+	path = tmux/.tmux/plugins/vim-tmux-navigator
+	url = https://github.com/christoomey/vim-tmux-navigator.git
diff --git a/nvim/.config/nvim/init.lua b/nvim/.config/nvim/init.lua
index 07ac756..be86352 100644
--- a/nvim/.config/nvim/init.lua
+++ b/nvim/.config/nvim/init.lua
@@ -93,6 +93,11 @@ vim.g.clipboard = {
   cache_enabled = true
 }
 
+-- No default mappings for tmux navigator
+vim.g.tmux_navigator_no_mappings    = 1
+-- Write the current buffer, but only if changed before navigating from Vim to tmux pane
+vim.g.tmux_navigator_save_on_switch = 1
+
 -- We do this to prevent the loading of the system fzf.vim plugin. This is
 -- present at least on Arch/Manjaro
 vim.api.nvim_command('set rtp-=/usr/share/vim/vimfiles')
diff --git a/nvim/.config/nvim/lua/keymappings.lua b/nvim/.config/nvim/lua/keymappings.lua
index 86c04ea..e36b690 100644
--- a/nvim/.config/nvim/lua/keymappings.lua
+++ b/nvim/.config/nvim/lua/keymappings.lua
@@ -1,6 +1,7 @@
-local remap     = vim.api.nvim_set_keymap
-local expr_opts = { noremap=true, unique=true, expr=true }
-local opts      = { noremap=true, unique=true }
+local remap       = vim.api.nvim_set_keymap
+local expr_opts   = { noremap=true, unique=true, expr=true }
+local silent_opts = { noremap=true, unique=true, silent=true }
+local opts        = { noremap=true, unique=true }
 
 remap('c', '<Esc>', '<C-C>', opts)
 remap('n', '<Esc>', '<Esc>:noh<CR>', opts)
@@ -144,3 +145,9 @@ remap('n', ',D', '<cmd>lua vim.diagnostic.open_float(0, {scope="cursor"})<CR>',
 remap('n', '<Leader>dc', ':DiffConflicts<CR>'           , opts)
 remap('n', '<Leader>ds', ':DiffConflictsShowHistory<CR>', opts)
 remap('n', '<Leader>dw', ':DiffConflictsWithHistory<CR>', opts)
+
+-- Tmux pane and nvim window switching
+remap('n', '<C-Left>' , ':TmuxNavigateLeft<CR>' , silent_opts)
+remap('n', '<C-Right>', ':TmuxNavigateRight<CR>', silent_opts)
+remap('n', '<C-Up>'   , ':TmuxNavigateUp<CR>'   , silent_opts)
+remap('n', '<C-Down>' , ':TmuxNavigateDown<CR>' , silent_opts)
diff --git a/nvim/.config/nvim/lua/plugins.lua b/nvim/.config/nvim/lua/plugins.lua
index c478932..42ed5cc 100644
--- a/nvim/.config/nvim/lua/plugins.lua
+++ b/nvim/.config/nvim/lua/plugins.lua
@@ -101,6 +101,7 @@ local init = function ()
     'chentau/marks.nvim',
   }
   use 'andymass/vim-matchup'
+  use 'christoomey/vim-tmux-navigator'
 end
 
 return require('packer').startup(init)
diff --git a/tmux/.tmux.conf b/tmux/.tmux.conf
index 26a0ab3..398541f 100644
--- a/tmux/.tmux.conf
+++ b/tmux/.tmux.conf
@@ -35,11 +35,26 @@ set-option -g allow-rename off
 set -g mouse on
 set -g focus-events on
 
-# Use Ctrl-arrow keys without prefix key to switch panes
-bind -n C-Left select-pane -L
-bind -n C-Right select-pane -R
-bind -n C-Up select-pane -U
-bind -n C-Down select-pane -D
+# 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)?$'"
+
+bind-key -n 'C-Left'  if-shell "$is_vim" 'send-keys C-Left'  'select-pane -L'
+bind-key -n 'C-Down'  if-shell "$is_vim" 'send-keys C-Down'  'select-pane -D'
+bind-key -n 'C-Up'    if-shell "$is_vim" 'send-keys C-Up'    'select-pane -U'
+bind-key -n 'C-Right' if-shell "$is_vim" 'send-keys C-Right' 'select-pane -R'
+
+tmux_version='$(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-Left'  select-pane -L
+bind-key -T copy-mode-vi 'C-Down'  select-pane -D
+bind-key -T copy-mode-vi 'C-Up'    select-pane -U
+bind-key -T copy-mode-vi 'C-Right' select-pane -R
 
 # Pane resizing with arrow keys
 bind Left resize-pane -L 10
diff --git a/tmux/.tmux/plugins/vim-tmux-navigator b/tmux/.tmux/plugins/vim-tmux-navigator
new file mode 160000
index 0000000..9ca5bfe
--- /dev/null
+++ b/tmux/.tmux/plugins/vim-tmux-navigator
@@ -0,0 +1 @@
+Subproject commit 9ca5bfe5bd274051b5dd796cc150348afc993b80