fix(constants): extract browser to $BROWSER

configs/chromium.nix

@@ -13,5 +13,5 @@
 
   environment.systemPackages = [ pkgs.chromium ];
 
-  niveum.applications.browser = "chromium";
+  environment.variables.BROWSER = "chromium";
 }

configs/default.nix

@@ -81,6 +81,18 @@ in
     {
       services.dbus.packages = [ pkgs.gnome3.dconf ];
     }
+    {
+      environment.systemPackages = [
+        (pkgs.writers.writeDashBin "x-www-browser" ''
+          for browser in $BROWSER firefox chromium google-chrome google-chrome-stable opera vivaldi qupzilla iceweasel konqueror firefox-aurora google-chrome-beta opera-beta vivaldi-beta google-chrome-dev opera-developer vivaldi-snapshot luakit midori epiphany lynx w3m dillo elinks vimb; do
+            if command -v $browser > /dev/null 2>&1; then
+              exec $browser "$@"
+            fi
+          done
+          exit 1
+        '')
+      ];
+    }
     {
       nixpkgs = {
         config.allowUnfree = true;

configs/dunst.nix

@@ -31,7 +31,7 @@ with config.niveum; {
         sticky_history = true;
         history_length = 20;
         dmenu = "${pkgs.rofi}/bin/rofi -display-run dunst -show run";
-        browser = applications.browser;
+        browser = "x-www-browser";
         verbosity = "mesg";
         corner_radius = 0;
         mouse_left_click = "do_action";

configs/i3.nix

@@ -105,7 +105,7 @@ in with config.niveum; {
         "${modifier}+v" = "split v";
         "${modifier}+w" = "layout tabbed";
         "${modifier}+x" = "exec --no-startup-id ${new-workspace}";
-        "${modifier}+y" = "exec ${applications.browser}";
+        "${modifier}+y" = "exec x-www-browser";
         "XF86AudioLowerVolume" = "exec --no-startup-id ${pkgs.pamixer}/bin/pamixer -d 5";
         "XF86AudioMute" = "exec --no-startup-id ${pkgs.pamixer}/bin/pamixer -t";
         "XF86AudioRaiseVolume" = "exec --no-startup-id ${pkgs.pamixer}/bin/pamixer -i 5";

modules/constants.nix

@@ -35,8 +35,6 @@ let
 in {
   options.niveum = {
     applications = {
-      terminal = mkOption { type = types.str; };
-      browser = mkOption { type = types.str; };
       fileManager = mkOption { type = types.str; };
     };