# PaneInformation

The PaneInformation struct describes a pane. Unlike the Pane object, PaneInformation is a snapshot of some of the key characteristics of the pane, intended for use in synchronous, fast, event callbacks that format GUI elements such as the window and tab title bars.

The PaneInformation struct contains the following fields:

• pane_id - the pane identifier number
• pane_index - the logical position of the pane within its containing layout
• is_active - is true if the pane is the active pane within its containing tab
• is_zoomed - is true if the pane is in the zoomed state
• left - the cell x coordinate of the left edge of the pane
• top - the cell y coordinate of the top edge of the pane
• width - the width of the pane in cells
• height - the height of the pane in cells
• pixel_width - the width of the pane in pixels
• pixel_height - the height of the pane in pixels
• title - the title of the pane, per pane:get_title() at the time the pane information was captured
• user_vars - the user variables defined for the pane, per pane:get_user_vars() at the time the pane information was captured.

Since: 20220101-133340-7edc5b5a

Additional fields are available; note that accessing these may not be cheap to compute and may slow down wezterm. Unlike the fields listed above, these are not pre-computed snapshots of information, so if you don't use them, you won't pay the cost of computing them.

This example places the executable name in the tab titles:

local wezterm = require 'wezterm'

-- Equivalent to POSIX basename(3)
-- Given "/foo/bar" returns "bar"
-- Given "c:\\foo\\bar" returns "bar"
function basename(s)
return string.gsub(s, "(.*[/\\])(.*)", "%2")
end

wezterm.on("format-tab-title", function(tab, tabs, panes, config, hover, max_width)
local pane = tab.active_pane
local title = basename(pane.foreground_process_name) .. " " .. pane.pane_id
local color = "navy"
if tab.is_active then
color = "blue"
end
return {
{Background={Color=color}},
{Text=" " .. title .. " "},
}
end)

return {
}


Since: 20220319-142410-0fcdea07

The has_unseen_output field returns true if the there has been output in the pane since the last time it was focused.

This example shows how to use this event to change the color of the tab in the tab bar when there is unseen output.

local wezterm = require 'wezterm'

wezterm.on("format-tab-title", function(tab, tabs, panes, config, hover, max_width)
if tab.is_active then
return {
{Background={Color="blue"}},
{Text=" " .. tab.active_pane.title .. " "},
}
end
local has_unseen_output = false
for _, pane in ipairs(tab.panes) do
if pane.has_unseen_output then
has_unseen_output = true
break;
end
end
if has_unseen_output then
return {
{Background={Color="Orange"}},
{Text=" " .. tab.active_pane.title .. " "},
}
end
return tab.active_pane.title
end)

return {
}


Since: 20220624-141144-bd1b7c5d

The domain_name field returns the name of the domain with which the pane is associated.

This example shows the domain name of the active pane appended to the tab title:

local wezterm = require 'wezterm'

wezterm.on('format-tab-title', function(tab)
local pane = tab.active_pane
local title = pane.title
if pane.domain_name then
title = title .. ' - (' .. pane.domain_name .. ')'
end
return title
end)

return {
}