From f18e2933d485d1d93d399b9637e26a0de1510747 Mon Sep 17 00:00:00 2001
From: Robert Helgesson <robert@rycee.net>
Date: Sun, 21 Apr 2019 19:31:44 +0200
Subject: [PATCH] fontconfig: generate font cache files

Also deprecates the `fonts.fontconfig.enableProfileFonts` option. The
configuration is now always generated if `fonts.fontconfig.enable` is
set.

Fixes #520
---
 modules/misc/fontconfig.nix | 56 +++++++++++++++++++++++++++++++------
 1 file changed, 47 insertions(+), 9 deletions(-)

diff --git a/modules/misc/fontconfig.nix b/modules/misc/fontconfig.nix
index 9ad8b195f..2b989c8fc 100644
--- a/modules/misc/fontconfig.nix
+++ b/modules/misc/fontconfig.nix
@@ -6,36 +6,74 @@ let
 
   cfg = config.fonts.fontconfig;
 
+  profileDirectory = config.home.profileDirectory;
+
 in
 
 {
   meta.maintainers = [ maintainers.rycee ];
 
+  imports = [
+    (mkRenamedOptionModule
+      [ "fonts" "fontconfig" "enableProfileFonts" ]
+      [ "fonts" "fontconfig" "enable" ])
+  ];
+
   options = {
     fonts.fontconfig = {
-      enableProfileFonts = mkOption {
+      enable = mkOption {
         type = types.bool;
         default = false;
-        example = true;
         description = ''
-          Configure fontconfig to discover fonts installed through
+          Whether to enable fontconfig configuration. This will, for
+          example, allow fontconfig to discover fonts and
+          configurations installed through
           <varname>home.packages</varname> and
           <command>nix-env</command>.
-          </para><para>
-          Note, this is only necessary on non-NixOS systems.
         '';
       };
     };
   };
 
-  config = mkIf cfg.enableProfileFonts {
-    xdg.configFile."fontconfig/conf.d/10-nix-profile-fonts.conf".text = ''
+  config = mkIf cfg.enable {
+    home.extraProfileCommands = ''
+      export FONTCONFIG_FILE=$(pwd)/fonts.conf
+
+      cat > $FONTCONFIG_FILE << EOF
       <?xml version='1.0'?>
       <!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
       <fontconfig>
-        <dir>${config.home.profileDirectory}/lib/X11/fonts</dir>
-        <dir>${config.home.profileDirectory}/share/fonts</dir>
+        <dir>$out/lib/X11/fonts</dir>
+        <dir>$out/share/fonts</dir>
+        <cachedir>$out/lib/fontconfig/cache</cachedir>
       </fontconfig>
+      EOF
+
+      ${getBin pkgs.fontconfig}/bin/fc-cache -f
+      rm $out/lib/fontconfig/cache/CACHEDIR.TAG
+
+      unset FONTCONFIG_FILE
     '';
+
+    xdg.configFile = {
+      "fontconfig/conf.d/10-hm-fonts.conf".text = ''
+        <?xml version='1.0'?>
+
+        <!-- Generated by Home Manager. -->
+
+        <!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
+        <fontconfig>
+          <include ignore_missing="yes">${config.home.path}/etc/fonts/conf.d</include>
+          <include ignore_missing="yes">${config.home.path}/etc/fonts/fonts.conf</include>
+
+          <dir>${config.home.path}/lib/X11/fonts</dir>
+          <dir>${config.home.path}/share/fonts</dir>
+          <dir>${profileDirectory}/lib/X11/fonts</dir>
+          <dir>${profileDirectory}/share/fonts</dir>
+
+          <cachedir>${config.home.path}/lib/fontconfig/cache</cachedir>
+        </fontconfig>
+      '';
+    };
   };
 }