add nvim side for zellij, waiting for zellij side

[zellij #967](zellij-org/zellij#967)

README.md

@@ -55,6 +55,7 @@ vim.keymap.set({'n', 't'}, '<A-p>', '<CMD>NavigatorPrevious<CR>')
 
 - [Tmux](https://github.com/numToStr/Navigator.nvim/wiki/Tmux-Integration)
 - [WezTerm](https://github.com/numToStr/Navigator.nvim/wiki/WezTerm-Integration)
+- [Zellij](https://github.com/numToStr/Navigator.nvim/wiki/Zellij-Integration)
 
 #### Configuration (optional)
 

lua/Navigator/mux/zellij.lua

@@ -0,0 +1,56 @@
+---@mod navigator.zellij Zellij navigator
+---@brief [[
+---This module provides navigation and interaction for Zellij, and uses |navigator.vi|
+---as a base class. This is used automatically when zellij is detected on host system
+---but can also be used to manually override the mux.
+---
+---@brief ]]
+
+---@private
+---@class Zellij: Vi
+---@field private direction table<Direction, string>
+---@field private execute fun(arg: string): unknown
+local Zellij = require('Navigator.mux.vi'):new()
+
+---Creates a new Zellij navigator instance
+---@return Zellij
+---@usage [[
+---local ok, zellij = pcall(function()
+---    return require('Navigator.mux.zellij'):new()
+---end)
+---
+---require('Navigator').setup({
+---    mux = ok and zellij or 'auto'
+---})
+---@usage ]]
+function Zellij:new()
+  assert(os.getenv('ZELLIJ'), '[Navigator] Zellij is not running!')
+  local U = require('Navigator.utils')
+
+  ---@type Zellij
+  local state = {
+    execute = function(arg)
+      local cmd = string.format('zellij action %s', arg)
+      return U.execute(cmd)
+    end,
+    direction = {
+      p = 'focus-previous-pane',
+      h = 'move-focus left',
+      k = 'move-focus up',
+      l = 'move-focus right',
+      j = 'move-focus down'
+    },
+  }
+  self.__index = self
+  return setmetatable(state, self)
+end
+
+---Switch pane in zellij
+---@param direction Direction See |navigator.api.Direction|
+---@return Zellij
+function Zellij:navigate(direction)
+  self.execute(string.format('%s', self.direction[direction]))
+  return self
+end
+
+return Zellij

lua/Navigator/navigate.lua

@@ -13,18 +13,27 @@ local N = {
 ---Detect and load correct mux
 ---@return Vi
 local function load_mux()
+    local ok_zellij, zellij = pcall(function()
+        return require('Navigator.mux.zellij'):new()
+    end)
+    if ok_zellij then
+        return zellij
+    end
+
     local ok_tmux, tmux = pcall(function()
         return require('Navigator.mux.tmux'):new()
     end)
     if ok_tmux then
         return tmux
     end
+
     local ok_wezterm, wezterm = pcall(function()
         return require('Navigator.mux.wezterm'):new()
     end)
     if ok_wezterm then
         return wezterm
     end
+
     return require('Navigator.mux.vi'):new()
 end