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home-cursor: improve icon compatibility

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The current cursor configuration poorly accomodate applications not
following the XDG icon theme spec. As a result, some applications fail
to locate user defined icons and themes.

To address this, symlinks from icon directories in the provided cursor
package was to $HOME/.icons were added added for greater compatibility
with applications using hardcoded icons directories. This approach was
chosen to allow for coexistence of declarative and non-declarative
icon files in the icons directory. In addition, symlinks of icon
directories were mirrored in $XDG_DATA_HOME/.icons for backwards
compatibility. As per the XDG icon theme spec, applications are to
search in $HOME/.icons first for icons and themes so the existing
behavior should not break for XDG compliant applications[1].

[1] https://specifications.freedesktop.org/icon-theme-spec/latest/ar01s03.html
This commit is contained in:
polykernel 2023-07-28 22:01:41 -04:00 committed by Robert Helgesson
parent 6a94c1a597
commit bdb5bcad01
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GPG Key ID: 36BDAA14C2797E89
1 changed files with 37 additions and 11 deletions
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48
modules/config/home-cursor.nix
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@ -52,6 +52,27 @@ let
escapeShellArg cfg.x11.defaultCursor
}";
defaultIndexThemePackage = pkgs.writeTextFile {
name = "index.theme";
destination = "/share/icons/default/index.theme";
# Set name in icons theme, for compatibility with AwesomeWM etc. See:
# https://github.com/nix-community/home-manager/issues/2081
# https://wiki.archlinux.org/title/Cursor_themes#XDG_specification
text = ''
[Icon Theme]
Name=Default
Comment=Default Cursor Theme
Inherits=${cfg.name}
'';
};
iconMappings = let
knownFiles = filterAttrs (_: type: type != "unknown")
(builtins.readDir "${cfg.package}/share/icons");
in mapAttrs'
(n: _: nameValuePair ".icons/${n}" "${cfg.package}/share/icons/${n}")
knownFiles;
in {
meta.maintainers = [ maintainers.polykernel maintainers.league ];
@ -120,17 +141,7 @@ in {
(hm.assertions.assertPlatform "home.pointerCursor" pkgs platforms.linux)
];
home.packages = [ cfg.package ];
# Set name in icons theme, for compatibility with AwesomeWM etc. See:
# https://github.com/nix-community/home-manager/issues/2081
# https://wiki.archlinux.org/title/Cursor_themes#XDG_specification
xdg.dataFile."icons/default/index.theme".text = ''
[icon theme]
Name=Default
Comment=Default Cursor Theme
Inherits=${cfg.name}
'';
home.packages = [ cfg.package defaultIndexThemePackage ];
# Set directory to look for cursors in, needed for some applications
# that are unable to find cursors otherwise. See:
@ -142,6 +153,21 @@ in {
XCURSOR_SIZE = mkDefault cfg.size;
XCURSOR_THEME = mkDefault cfg.name;
};
# Add symlinks of cursor icons to subdirectories in $HOME/.icons, needed for
# backwards compatibility with some applications. See:
# https://specifications.freedesktop.org/icon-theme-spec/latest/ar01s03.html
home.file = (mapAttrs (_: source: { inherit source; }) iconMappings) // {
".icons/default/index.theme".source =
"${defaultIndexThemePackage}/share/icons/default/index.theme";
};
# Add cursor icon links to $XDG_DATA_HOME as well for redundancy.
xdg.dataFile = (mapAttrs (_: source: { inherit source; }) iconMappings)
// {
".icons/default/index.theme".source =
"${defaultIndexThemePackage}/share/icons/default/index.theme";
};
}
(mkIf cfg.x11.enable {