dunst: set icon theme (#2201)

Closes: https://github.com/nix-community/stylix/issues/1948
Link: https://github.com/nix-community/stylix/pull/2201

Reviewed-by: NAHO <90870942+trueNAHO@users.noreply.github.com>

modules/dunst/hm.nix

@@ -43,5 +43,16 @@ mkTarget {
           };
       }
     )
+    (
+      { polarity, icons }:
+      {
+        services.dunst = {
+          iconTheme = {
+            inherit (icons) package;
+            name = if polarity == "dark" then icons.dark else icons.light;
+          };
+        };
+      }
+    )
   ];
 }

stylix/testbed/modules/application.nix

@@ -128,15 +128,28 @@ in
                   text = ''
                     for percent in {0..100}; do
                       ${lib.concatMapStrings
-                        (urgency: ''
-                          notify-send \
-                            --hint="int:value:$percent" \
-                            --hint=string:x-dunst-stack-tag:${urgency} \
-                            --urgency ${urgency} \
-                            ${urgency} \
-                            urgency \
-                            &
-                        '')
+                        (
+                          urgency:
+                          let
+                            icon =
+                              {
+                                low = "dialog-information.svg";
+                                normal = "dialog-warning.svg";
+                                critical = "dialog-error.svg";
+                              }
+                              .${urgency};
+                          in
+                          ''
+                            notify-send \
+                              --hint="int:value:$percent" \
+                              --hint=string:x-dunst-stack-tag:${urgency} \
+                              --icon ${pkgs.papirus-icon-theme}/share/icons/Papirus/32x32/status/${icon} \
+                              --urgency ${urgency} \
+                              ${urgency} \
+                              urgency \
+                              &
+                          ''
+                        )
                         [
                           "low"
                           "normal"