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wezterm/docs/config/lua/window/get_appearance.md
2021-09-03 09:11:00 -07:00

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# window:get_appearance()
*Since: 20210814-124438-54e29167*
This method returns the appearance of the window environment. The appearance
can be one of the following 4 values:
* `"Light"` - the normal appearance, with dark text on a light background
* `"Dark"` - "dark mode", with predominantly dark colors and probably a lighter, lower contrasting, text color on a dark background
* `"LightHighContrast"` - light mode but with high contrast colors
* `"DarkHighContrast"` - dark mode but with high contrast colors
wezterm currently doesn't know how to interrogate the appearance on Wayland
systems, and will always report `"Light"`.
On macOS, X11 and Windows systems, wezterm is able to detect when the
appearance has changed and will generate a
[window-config-reloaded](../window-events/window-config-reloaded.md) event for each
window.
This example configuration shows how you can have your color scheme
automatically adjust to the current appearance:
```lua
local wezterm = require 'wezterm'
function scheme_for_appearance(appearance)
if appearance:find("Dark") then
return "Builtin Solarized Dark"
else
return "Builtin Solarized Light"
end
end
wezterm.on("window-config-reloaded", function(window, pane)
local overrides = window:get_config_overrides() or {}
local appearance = window:get_appearance()
local scheme = scheme_for_appearance(appearance)
if overrides.color_scheme ~= scheme then
overrides.color_scheme = scheme
window:set_config_overrides(overrides)
end
end)
return {
}
```
### Wayland GNOME Appearance
The GNOME desktop environment provides the `gsettings` tool that can
inform us of the selected appearance even in a Wayland session. We can
substitute the call to `window:get_appearance` above with a call to the
following function, which takes advantage of this:
```lua
function query_appearance_gnome()
local success, stdout = wezterm.run_child_process(
{"gsettings", "get", "org.gnome.desktop.interface", "gtk-theme"}
)
-- lowercase and remove whitespace
stdout = stdout:lower():gsub("%s+", "")
local mapping = {
highcontrast = "LightHighContrast",
highcontrastinverse = "DarkHighContrast",
adwaita = "Light",
["adwaita-dark"] = "Dark"
}
local appearance = mapping[stdout]
if appearance then
return appearance
end
if stdout:find("dark") then
return "Dark"
end
return "Light"
end
```
Since WezTerm will not fire a `window-config-reloaded`
event on Wayland, you will instead need to listen on the
[update-right-status](../window-events/update-right-status.md) event,
which will essentially poll for the appearance periodically:
```lua
local wezterm = require 'wezterm'
function scheme_for_appearance(appearance)
if appearance:find("Dark") then
return "Builtin Solarized Dark"
else
return "Builtin Solarized Light"
end
end
wezterm.on("update-right-status", function(window, pane)
local overrides = window:get_config_overrides() or {}
local appearance = query_appearance_gnome()
local scheme = scheme_for_appearance(appearance)
if overrides.color_scheme ~= scheme then
overrides.color_scheme = scheme
window:set_config_overrides(overrides)
end
end)
return {
}
```