`gui-startup`

The gui-startup event is emitted once when the GUI server is starting up when running the wezterm start subcommand.

It is triggered before any default program is started.

If no explicit program was passed to wezterm start, and if the gui-startup event causes any panes to be created then those will take precedence over the default program configuration and no additional default program will be spawned.

This event is useful for starting a set of programs in a standard configuration to save you the effort of doing it manually each time.

This event fires before gui-attached.

This event does not fire for wezterm connect invocations.

The event receives an optional SpawnCommand argument that corresponds to any arguments that may have been passed via wezterm start. In earlier releases if you implemented this event, you would essentially prevent wezterm start -- something from spawning something.

The intent is for you to use the information in the command object to spawn a new window, but you can choose to use or ignore it as suits your purpose.

This basic example splits an initial window into thirds:

local wezterm = require 'wezterm'
local mux = wezterm.mux
local config = {}

wezterm.on('gui-startup', function(cmd)
  local tab, pane, window = mux.spawn_window(cmd or {})
  -- Create a split occupying the right 1/3 of the screen
  pane:split { size = 0.3 }
  -- Create another split in the right of the remaining 2/3
  -- of the space; the resultant split is in the middle
  -- 1/3 of the display and has the focus.
  pane:split { size = 0.5 }
end)

return config

This example creates a default window but makes it maximize on startup:

local wezterm = require 'wezterm'
local mux = wezterm.mux
local config = {}

wezterm.on('gui-startup', function(cmd)
  local tab, pane, window = mux.spawn_window(cmd or {})
  window:gui_window():maximize()
end)

return config

Here's a more elaborate example that configures two workspaces:

local wezterm = require 'wezterm'
local mux = wezterm.mux
local config = {}

wezterm.on('gui-startup', function(cmd)
  -- allow `wezterm start -- something` to affect what we spawn
  -- in our initial window
  local args = {}
  if cmd then
    args = cmd.args
  end

  -- Set a workspace for coding on a current project
  -- Top pane is for the editor, bottom pane is for the build tool
  local project_dir = wezterm.home_dir .. '/wezterm'
  local tab, build_pane, window = mux.spawn_window {
    workspace = 'coding',
    cwd = project_dir,
    args = args,
  }
  local editor_pane = build_pane:split {
    direction = 'Top',
    size = 0.6,
    cwd = project_dir,
  }
  -- may as well kick off a build in that pane
  build_pane:send_text 'cargo build\n'

  -- A workspace for interacting with a local machine that
  -- runs some docker containners for home automation
  local tab, pane, window = mux.spawn_window {
    workspace = 'automation',
    args = { 'ssh', 'vault' },
  }

  -- We want to startup in the coding workspace
  mux.set_active_workspace 'coding'
end)

return config

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gui-startup

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`gui-startup`