wezterm/docs/config/lua/window/set_config_overrides.md

window:set_config_overrides(overrides)

Since: 20210314-114017-04b7cedd

Changes the set of configuration overrides for the window. The config file is re-evaluated and any CLI overrides are applied, followed by the keys and values from the overrides parameter.

This can be used to override configuration on a per-window basis; this is only useful for options that apply to the GUI window, such as rendering the GUI.

Each call to window:set_config_overrides will emit the window-config-reloaded event for the window. If you are calling this method from inside the handler for window-config-reloaded you should take care to only call window:set_config_overrides if the actual override values have changed to avoid a loop.

In this example, a key assignment (CTRL-SHIFT-E) is used to toggle the use of ligatures in the current window:

local wezterm = require 'wezterm'

wezterm.on("toggle-ligature", function(window, pane)
  local overrides = window:get_config_overrides() or {}
  if not overrides.harfbuzz_features then
    -- If we haven't overriden it yet, then override with ligatures disabled
    overrides.harfbuzz_features =  {"calt=0", "clig=0", "liga=0"}
  else
    -- else we did already, and we should disable out override now
    overrides.harfbuzz_features = nil
  end
  window:set_config_overrides(overrides)
end)

return {
  keys = {
    {key="E", mods="CTRL", action=wezterm.action{EmitEvent="toggle-ligature"}},
  },
}

In this example, a key assignment (CTRL-SHIFT-B) is used to toggle opacity for the window:

local wezterm = require 'wezterm'

wezterm.on("toggle-opacity", function(window, pane)
  local overrides = window:get_config_overrides() or {}
  if not overrides.window_background_opacity then
    overrides.window_background_opacity = 0.5;
  else
    overrides.window_background_opacity = nil
  end
  window:set_config_overrides(overrides)
end)

return {
  keys = {
    {key="B", mods="CTRL", action=wezterm.action{EmitEvent="toggle-opacity"}},
  },
}