modules/programs: introduce a gsettings config option, which so far routes to dconf but later will stand alone

hosts/common/programs/dconf.nix

@@ -5,6 +5,17 @@
 { config, lib, pkgs, ... }:
 
 let
+  # [ ProgramConfig ]
+  enabledPrograms = builtins.filter
+    (p: p.enabled && p.gsettings != {})
+    (builtins.attrValues config.sane.programs);
+
+  sitePackages = lib.map (p: pkgs.writeTextFile {
+    name = "${p.name}-dconf";
+    destination = "/etc/dconf/db/site.d/10_${p.name}";
+    text = lib.generators.toDconfINI p.gsettings;
+  }) enabledPrograms;
+
   cfg = config.sane.programs.dconf;
 in
 {
@@ -13,10 +24,11 @@ in
       type = types.submodule {
         options = {
           site = mkOption {
+            # TODO: this option shouldn't be necessary; generate it all directly from `gsettings`
             type = types.listOf types.package;
             default = [];
             description = ''
-              extra packages to link into /etc/dconf
+              dconf values to link into /etc/dconf
             '';
           };
         };
@@ -40,7 +52,7 @@ in
     # but in practice seems unnecessary.
     # env.GIO_EXTRA_MODULES = "${pkgs.dconf.lib}/lib/gio/modules";
 
-    config.site = [
+    config.site = sitePackages ++ [
       (pkgs.writeTextFile {
         name = "dconf-user-profile";
         destination = "/etc/dconf/profile/user";

hosts/common/programs/gnome-weather.nix

@@ -1,6 +1,4 @@
-# preferences are saved via dconf; see `dconf dump /`
+{ lib, pkgs, ... }:
-# cache dir is just for weather data (or maybe a http cache)
-{ config, lib, pkgs, ... }:
 {
   sane.programs.gnome-weather = {
     buildCost = 1;
@@ -16,21 +14,29 @@
     sandbox.wrapperType = "inplace";  #< /share/org.gnome.Weather/org.gnome.Weather file refers to bins by full path
     sandbox.whitelistWayland = true;
     sandbox.net = "clearnet";
-    suggestedPrograms = [ "dconf" ];  #< stores city/location settings
 
     persist.byStore.plaintext = [
-      ".cache/libgweather"
+      ".cache/libgweather"  # weather data (or maybe a http cache)
+    ];
+
+    gsettings."org/gnome/Weather" = with lib.gvariant; {
+      # i have no idea the schema: i just exported this after manually entering a location
+      locations = [
+        (mkVariant
+          (mkTuple [
+            (mkUint32 2)
+            (mkVariant
+              (mkTuple [
+                "Seattle"
+                "KBFI"
+                true
+                [ (mkTuple [ 0.82983133145337307 (-2.134775231953554) ]) ]
+                [ (mkTuple [ 0.83088509144255718 (-2.135097419733472) ]) ]
+              ])
+            )
+          ])
+        )
       ];
     };
-
+  };
-  sane.programs.dconf.config.site = lib.mkIf config.sane.programs.gnome-weather.enabled [
-    (pkgs.writeTextFile {
-      name = "sane-gnome-weather";
-      destination = "/etc/dconf/db/site.d/10_gnome_weather";
-      text = ''
-        [org/gnome/Weather]
-        locations=[<(uint32 2, <('Seattle', 'KBFI', true, [(0.82983133145337307, -2.134775231953554)], [(0.83088509144255718, -2.135097419733472)])>)>]
-      '';
-    })
-  ];
 }

hosts/common/programs/sane-theme.nix

@@ -312,27 +312,17 @@ in
     suggestedPrograms = [
       "sane-backgrounds"
     ];
+
+    gsettings."org/gnome/desktop/interface" = {
+      inherit (cfg) color-scheme cursor-theme gtk-theme icon-theme;
+    };
   };
 
   sane.programs.sane-backgrounds = {
     sandbox.enable = false;  #< no binaries
   };
 
-
   environment.pathsToLink = lib.mkIf config.sane.programs.sane-backgrounds.enabled [
     "/share/backgrounds"
   ];
-  sane.programs.dconf.config.site = lib.mkIf config.sane.programs.sane-theme.enabled [
-    (pkgs.writeTextFile {
-      name = "sane-theme";
-      destination = "/etc/dconf/db/site.d/10_gtk_settings";
-      text = ''
-        [org/gnome/desktop/interface]
-        color-scheme="${cfg.color-scheme}"
-        cursor-theme="${cfg.cursor-theme}"
-        gtk-theme="${cfg.gtk-theme}"
-        icon-theme="${cfg.icon-theme}"
-      '';
-    })
-  ];
 }

modules/programs/default.nix

@@ -111,6 +111,10 @@ let
   );
   pkgSpec = with lib; types.submodule ({ config, name, ... }: {
     options = {
+      name = mkOption {
+        type = types.str;
+        default = name;
+      };
       packageUnwrapped = mkOption {
         type = types.nullOr types.package;
         description = ''
@@ -165,6 +169,24 @@ let
         type = types.bool;
         default = true;
       };
+      # XXX: even if these `gsettings` and `mime` properties aren't used by this module,
+      # putting them here allows for the visibility by the consumers that do actually use them.
+      gsettings = mkOption {
+        type = types.attrs;
+        default = {};
+        description = ''
+          gsetting config values to provide this program (and the broader system).
+          this is the nix representation of what you'd want `dconf dump /` to show
+          (only, it's not plumbed to dconf but rather the layer above it -- gsettings).
+        '';
+        example = ''
+        {
+          "org/erikreider/swaync" = {
+            dnd-state = true;
+          };
+        }
+        '';
+      };
       mime.priority = mkOption {
         type = types.int;
         default = 100;