feat(plugins): wezterm integration (folke#61)

* feat: wezterm integration

This adds support for font-size adaptation in the wezterm terminal.

References:
- wez/wezterm#2550
- https://www.reddit.com/r/neovim/comments/xn1q75/comment/iprdrpr

* Update wezterm integration docs

* Fix markdown codeblock

README.md

@@ -20,6 +20,7 @@ Distraction-free coding for Neovim >= 0.5
   - hide [tmux](https://github.com/tmux/tmux) status line
   - increase [Kitty](https://sw.kovidgoyal.net/kitty/) font-size
   - increase [Alacritty](https://alacritty.org/) font-size
+  - increase [wezterm](https://wezfurlong.org/wezterm/) font-size
 - **Zen Mode** is automatically closed when a new non-floating window is opened
 - works well with plugins like [Telescope](https://github.com/nvim-telescope/telescope.nvim) to open a new buffer inside the Zen window
 - close the Zen window with `:ZenMode`, `:close` or `:quit`
@@ -118,6 +119,13 @@ EOF
       enabled = false,
       font = "14", -- font size
     },
+    -- this will change the font size on wezterm when in zen mode
+    -- See alse also the Plugins/Wezterm section in this projects README
+    wezterm = {
+      enabled = false,
+      -- can be either an absolute font size or the number of incremental steps
+      font = "+4", -- (10% increase per step)
+    },
   },
   -- callback where you can add custom code when the Zen window opens
   on_open = function(win)
@@ -142,6 +150,40 @@ require("zen-mode").toggle({
 })
 ```
 
+## 🧩 Plugins
+
+### Wezterm
+
+In order to make the integration with wezterm work as intended, you need to add
+the following function to your wezterm config:
+
+```lua
+wezterm.on('user-var-changed', function(window, pane, name, value)
+    local overrides = window:get_config_overrides() or {}
+    if name == "ZEN_MODE" then
+        local incremental = value:find("+")
+        local number_value = tonumber(value)
+        if incremental ~= nil then
+            while (number_value > 0) do
+                window:perform_action(wezterm.action.IncreaseFontSize, pane)
+                number_value = number_value - 1
+            end
+            overrides.enable_tab_bar = false
+        elseif number_value < 0 then
+            window:perform_action(wezterm.action.ResetFontSize, pane)
+            overrides.font_size = nil
+            overrides.enable_tab_bar = true
+        else
+            overrides.font_size = number_value
+            overrides.enable_tab_bar = false
+        end
+    end
+    window:set_config_overrides(overrides)
+end)
+```
+
+See also: https://github.com/wez/wezterm/discussions/2550
+
 ## Inspiration
 
 - Visual Studio Code [Zen Mode](https://code.visualstudio.com/docs/getstarted/userinterface#_zen-mode)

lua/zen-mode/config.lua

@@ -50,6 +50,13 @@ local defaults = {
       enabled = false,
       font = "14", -- font size
     },
+    -- this will change the font size on wezterm when in zen mode
+    -- See alse also the Plugins/Wezterm section in this projects README
+    wezterm = {
+      enabled = false,
+      -- can be either an absolute font size or the number of incremental steps
+      font = "+4", -- (10% increase per step)
+    },
   },
   -- callback where you can add custom code when the zen window opens
   on_open = function(_win) end,

lua/zen-mode/plugins.lua

@@ -63,6 +63,17 @@ function M.alacritty(state, disable, opts)
   vim.cmd([[redraw]])
 end
 
+-- changes the wezterm font size
+function M.wezterm(state, disable, opts)
+  local stdout = vim.loop.new_tty(1, false)
+  if disable then
+    stdout:write(('\x1b]1337;SetUserVar=%s=%s\b'):format('ZEN_MODE', vim.fn.system({ 'base64' }, tostring(opts.font))))
+  else
+    stdout:write(('\x1b]1337;SetUserVar=%s=%s\b'):format('ZEN_MODE', vim.fn.system({ 'base64' }, '-1')))
+  end
+  vim.cmd([[redraw]])
+end
+
 function M.twilight(state, disable)
   if disable then
     state.enabled = require("twilight.view").enabled