From e09dc1346ce1397b59ddaf8049aad927015bd165 Mon Sep 17 00:00:00 2001
From: "Kenneth Benzie (Benie)" <benie@infektor.net>
Date: Sat, 2 Mar 2024 17:39:06 +0000
Subject: [PATCH] Introduce nvim-tmux-navigator

Also integrate with my custom setup using tmux window options to
communicate between nvim and tmux for which panes contain nvim
processes.
---
 lua/plugins/tmux.lua | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 lua/plugins/tmux.lua

diff --git a/lua/plugins/tmux.lua b/lua/plugins/tmux.lua
new file mode 100644
index 0000000..ad795d0
--- /dev/null
+++ b/lua/plugins/tmux.lua
@@ -0,0 +1,35 @@
+return {
+  "alexghergh/nvim-tmux-navigation",
+  config = function()
+    local plugin = require('nvim-tmux-navigation')
+    plugin.setup({
+      disable_when_zoomed = true,
+    })
+
+    -- Integrate tmux navigation flag
+    local navigation_flag =
+      '@vim' .. vim.fn.substitute(vim.env.TMUX_PANE, '%', '\\%', 'g')
+    local function set_navigation_flag()
+      vim.fn.system('tmux set-window-option ' .. navigation_flag .. ' 1')
+    end
+    local function unset_navigation_flag()
+      vim.fn.system('tmux set-window-option -u ' .. navigation_flag)
+    end
+
+    -- [Un]set tmux window option to detect when to change pane.
+    set_navigation_flag()
+    local augroup = vim.api.nvim_create_augroup('tmux', { clear = true })
+    vim.api.nvim_create_autocmd('FocusGained', {
+      pattern = '*', group = augroup, callback = set_navigation_flag,
+    })
+    vim.api.nvim_create_autocmd('VimLeave', {
+      pattern = '*', group = augroup, callback = unset_navigation_flag,
+    })
+
+    -- Map nativation bindings
+    vim.keymap.set('n', "<C-h>", plugin.NvimTmuxNavigateLeft)
+    vim.keymap.set('n', "<C-j>", plugin.NvimTmuxNavigateDown)
+    vim.keymap.set('n', "<C-k>", plugin.NvimTmuxNavigateUp)
+    vim.keymap.set('n', "<C-l>", plugin.NvimTmuxNavigateRight)
+  end
+}