Center wezterm when opening additional new window(s) (CMD+N)

[Hacksore]

What Operating System(s) are you running on?

macOS

Which Wayland compositor or X11 Window manager(s) are you using?

No response

WezTerm version

wezterm 20240203-110809-5046fc22

Ask your question!

I have this scripture and seems to work fine for wezterm first spawning but if I CMD+N to create a new window it goes to a seemingly random position.

-- center
wezterm.on("gui-startup", function()
  local screen = wezterm.gui.screens().active
  local _, _, window = wezterm.mux.spawn_window({})

  local gui_window = window:gui_window()

  -- Set dimensions to 85% of current screen size
  -- The actual dimensions will be a bit bigger if we take into
  -- account the decorations on top
  local width = screen.width * 0.85
  local height = screen.height * 0.85

  gui_window:set_inner_size(width, height)

  -- Position the window at the center of the screen
  local dimensions = gui_window:get_dimensions()
  local x = (screen.width - dimensions.pixel_width) * 0.5
  local y = (screen.height - dimensions.pixel_height) * 0.5

  gui_window:set_position(x, y)
end)

demo of issue:

2024-06-17_10-53-24.mp4

[Hacksore]

paging the termfather himself!

@wez any ideas or pointers here?

[wez]

What you want is some kind of "gui-window-created" event, which we don't have right now.
You could approximate it for yourself by using the "update-status" event to resolve the mux-window-id of the window, and if you haven't seen it before (keep a list of things you've seen in wezterm.GLOBAL, then center the gui window.

[Hacksore]

will look into this and figure out if I can find a working scripture, thanks @wez ❤️.

Should i open a feature request for a gui-window-created event?

[wez]

yeah, I though we already had an issue tracking that event, but we don't.

You might want to try this in the meantime: #256 (comment)

[Hacksore]

Was able to find a working solution for this with what @wez suggestion above.

local function center_window_once(window)
  wezterm.GLOBAL.windows_centered = wezterm.GLOBAL.windows_centered or {}

  local window_id = window:window_id() .. ""
  if wezterm.GLOBAL.windows_centered[window_id] then
    return
  end

  local screen = wezterm.gui.screens().active

  local width = screen.width * 0.85
  local height = screen.height * 0.85

  window:set_inner_size(width, height)

  local dimensions = window:get_dimensions()
  local x = (screen.width - dimensions.pixel_width) * 0.5
  local y = (screen.height - dimensions.pixel_height) * 0.5

  wezterm.GLOBAL.windows_centered[window_id] = true

  window:set_position(x, y)
end

wezterm.on("update-status", function(window)
  center_window_once(window)
end)