refactor(screenshot): simplify capture bindings

configs/nixos/modules/desktop/utilities/screenshot.nix

@@ -7,26 +7,26 @@
 # Keyboard-driven screenshots copy to the clipboard before Satty opens for
 # annotation. Satty copies annotated screenshots when it saves them.
 let
-  user = config.user.name;
-
-  grimblast = "${pkgs.grimblast}/bin/grimblast";
-  satty = "${pkgs.satty}/bin/satty";
-  tee = "${pkgs.coreutils}/bin/tee";
-  wl-copy = "${pkgs.wl-clipboard}/bin/wl-copy";
-  xdgUserDir = "${pkgs.xdg-user-dirs}/bin/xdg-user-dir";
+  screenshotKey = keys: target: {
+    inherit keys;
+    action = {
+      kind = "exec";
+      command = "${capture target}";
+    };
+  };
 
   # Copy the original screenshot before Satty opens.
   # Satty copies and saves annotated screenshots when the user presses Enter.
   capture =
     target:
     pkgs.writeShellScript "screenshot-${target}" ''
-      dir="$(${xdgUserDir} PICTURES)/Screenshots"
-      mkdir -p "$dir"
-      ${grimblast} save ${target} - \
-        | ${tee} >(${wl-copy}) \
-        | ${satty} --filename - \
+      dir="$(${lib.getExe' pkgs.xdg-user-dirs "xdg-user-dir"} PICTURES)/Screenshots"
+      ${lib.getExe' pkgs.coreutils "mkdir"} -p "$dir"
+      ${lib.getExe pkgs.grimblast} save ${target} - \
+        | ${lib.getExe' pkgs.coreutils "tee"} >(${lib.getExe' pkgs.wl-clipboard "wl-copy"}) \
+        | ${lib.getExe pkgs.satty} --filename - \
           --output-filename "$dir/screenshot-%Y%m%d-%H%M%S.png" \
-          --copy-command ${wl-copy} \
+          --copy-command ${lib.getExe' pkgs.wl-clipboard "wl-copy"} \
           --save-after-copy \
           --early-exit \
           --actions-on-enter save-to-clipboard
@@ -37,33 +37,7 @@ in
     lib.mkEnableOption "screenshots via grimblast and satty";
 
   config = lib.mkIf config.modules.desktop.utilities.screenshot.enable {
-    registry.keybind.${config.networking.hostName} = {
-      screenshot-area = {
-        keys = "Print";
-        action = {
-          kind = "exec";
-          command = "${capture "area"}";
-        };
-      };
-
-      screenshot-active = {
-        keys = "SHIFT + Print";
-        action = {
-          kind = "exec";
-          command = "${capture "active"}";
-        };
-      };
-
-      screenshot-screen = {
-        keys = "CTRL + Print";
-        action = {
-          kind = "exec";
-          command = "${capture "screen"}";
-        };
-      };
-    };
-
-    home-manager.users.${user} = {
+    home-manager.users.${config.user.name} = {
       # satty is a one-shot annotation surface, so float it rather than letting
       # it claim a tile in the layout.
       wayland.windowManager.hyprland.settings.window_rule = [
@@ -72,7 +46,12 @@ in
           float = true;
         }
       ];
+    };
 
+    registry.keybind.${config.networking.hostName} = {
+      screenshot-area = screenshotKey "Print" "area";
+      screenshot-active = screenshotKey "SHIFT + Print" "active";
+      screenshot-screen = screenshotKey "CTRL + Print" "screen";
     };
   };
 }