87 lines
3.2 KiB
Nix
87 lines
3.2 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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{
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options = {
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gtk.iconCache.enable = mkOption {
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type = types.bool;
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default = config.services.xserver.enable;
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description = ''
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Whether to build icon theme caches for GTK applications.
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'';
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};
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};
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config = mkIf config.gtk.iconCache.enable {
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# (Re)build icon theme caches
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# ---------------------------
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# Each icon theme has its own cache. The difficult is that many
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# packages may contribute with icons to the same theme by installing
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# some icons.
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#
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# For instance, on my current NixOS system, the following packages
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# (among many others) have icons installed into the hicolor icon
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# theme: hicolor-icon-theme, psensor, wpa_gui, caja, etc.
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#
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# As another example, the mate icon theme has icons installed by the
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# packages mate-icon-theme, mate-settings-daemon, and libmateweather.
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#
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# The HighContrast icon theme also has icons from different packages,
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# like gnome-theme-extras and meld.
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# When the cache is built all of its icons has to be known. How to
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# implement this?
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#
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# I think that most themes have all icons installed by only one
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# package. On my system there are 71 themes installed. Only 3 of them
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# have icons installed from more than one package.
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#
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# If the main package of the theme provides a cache, presumably most
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# of its icons will be available to applications without running this
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# module. But additional icons offered by other packages will not be
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# available. Therefore I think that it is good that the main theme
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# package installs a cache (although it does not completely fixes the
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# situation for packages installed with nix-env).
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#
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# The module solution presented here keeps the cache when there is
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# only one package contributing with icons to the theme. Otherwise it
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# rebuilds the cache taking into account the icons provided all
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# packages.
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environment.extraSetup = ''
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# For each icon theme directory ...
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find $out/share/icons -mindepth 1 -maxdepth 1 -print0 | while read -d $'\0' themedir
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do
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# In order to build the cache, the theme dir should be
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# writable. When the theme dir is a symbolic link to somewhere
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# in the nix store it is not writable and it means that only
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# one package is contributing to the theme. If it already has
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# a cache, no rebuild is needed. Otherwise a cache has to be
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# built, and to be able to do that we first remove the
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# symbolic link and make a directory, and then make symbolic
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# links from the original directory into the new one.
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if [ ! -w "$themedir" -a -L "$themedir" -a ! -r "$themedir"/icon-theme.cache ]; then
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name=$(basename "$themedir")
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path=$(readlink -f "$themedir")
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rm "$themedir"
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mkdir -p "$themedir"
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ln -s "$path"/* "$themedir"/
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fi
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# (Re)build the cache if the theme dir is writable, replacing any
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# existing cache for the theme
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if [ -w "$themedir" ]; then
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rm -f "$themedir"/icon-theme.cache
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${pkgs.gtk3.out}/bin/gtk-update-icon-cache --ignore-theme-index "$themedir"
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fi
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done
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'';
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};
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}
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