refactor(flake): centralize custom packages

configs/nixos/modules/desktop/session/waybar.nix

@@ -30,6 +30,7 @@ in
 
     home-manager.users.${config.user.name}.programs.waybar = {
       enable = true;
+      package = pkgs.alexion.waybar;
 
       # A user service bound to graphical-session.target, which uwsm activates,
       # so the bar comes up with the session and no compositor exec-once.

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

@@ -7,6 +7,15 @@
 }:
 # PipeWire as the desktop audio server.
 let
+  volumeKey = keys: command: {
+    inherit keys;
+    repeating = true;
+    action = {
+      kind = "exec";
+      command = "${lib.getExe' pkgs.swayosd "swayosd-client"} --output-volume ${command}";
+    };
+  };
+
   mediaKey = keys: command: {
     inherit keys;
     locked = true;
@@ -30,6 +39,17 @@ in
     };
 
     registry.keybind.${config.networking.hostName} = {
+      volume-up = volumeKey "XF86AudioRaiseVolume" "raise --max-volume 100";
+      volume-down = volumeKey "XF86AudioLowerVolume" "lower";
+      mute = {
+        keys = "XF86AudioMute";
+        locked = true;
+        action = {
+          kind = "exec";
+          command = "${lib.getExe' pkgs.swayosd "swayosd-client"} --output-volume mute-toggle";
+        };
+      };
+
       media-play = mediaKey "XF86AudioPlay" "play-pause";
       media-next = mediaKey "XF86AudioNext" "next";
       media-previous = mediaKey "XF86AudioPrev" "previous";

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

@@ -5,39 +5,41 @@
   ...
 }:
 # SwayOSD: a transient on-screen popup for volume and brightness changes.
-let
-  user = config.user.name;
-in
 {
   options.modules.desktop.utilities.osd.enable =
     lib.mkEnableOption "the SwayOSD volume and brightness popup";
 
   config = lib.mkIf config.modules.desktop.utilities.osd.enable {
+    environment.systemPackages = [ pkgs.swayosd ];
+
+    # The udev rule chgrps each backlight's brightness node to `video` and adds
+    # group write, so the server dims the panel without root.
+    # Membership below grants the running session that access.
+    services.udev.packages = [ pkgs.swayosd ];
+    users.users.${config.user.name}.extraGroups = [ "video" ];
+
+    # The server draws the popups, so it runs for the whole graphical session.
+    # It binds to the target uwsm activates.
+    home-manager.users.${config.user.name}.systemd.user.services.swayosd = {
+      Unit = {
+        Description = "SwayOSD on-screen display server";
+        PartOf = [ "graphical-session.target" ];
+        After = [ "graphical-session.target" ];
+      };
+      Service = {
+        ExecStart = lib.getExe' pkgs.swayosd "swayosd-server";
+        Restart = "on-failure";
+      };
+      Install.WantedBy = [ "graphical-session.target" ];
+    };
+
     registry.keybind.${config.networking.hostName} = {
-      volume-up = {
-        keys = "XF86AudioRaiseVolume";
-        repeating = true;
-        action = {
-          kind = "exec";
-          command = "${pkgs.swayosd}/bin/swayosd-client --output-volume raise --max-volume 100";
-        };
-      };
-
-      volume-down = {
-        keys = "XF86AudioLowerVolume";
-        repeating = true;
-        action = {
-          kind = "exec";
-          command = "${pkgs.swayosd}/bin/swayosd-client --output-volume lower";
-        };
-      };
-
       brightness-up = {
         keys = "XF86MonBrightnessUp";
         repeating = true;
         action = {
           kind = "exec";
-          command = "${pkgs.swayosd}/bin/swayosd-client --brightness raise";
+          command = "${lib.getExe' pkgs.swayosd "swayosd-client"} --brightness raise";
         };
       };
 
@@ -46,41 +48,9 @@ in
         repeating = true;
         action = {
           kind = "exec";
-          command = "${pkgs.swayosd}/bin/swayosd-client --brightness lower";
+          command = "${lib.getExe' pkgs.swayosd "swayosd-client"} --brightness lower";
         };
       };
-
-      mute = {
-        keys = "XF86AudioMute";
-        locked = true;
-        action = {
-          kind = "exec";
-          command = "${pkgs.swayosd}/bin/swayosd-client --output-volume mute-toggle";
-        };
-      };
-    };
-
-    environment.systemPackages = [ pkgs.swayosd ];
-
-    # The udev rule chgrps each backlight's brightness node to `video` and adds
-    # group write, so the server dims the panel without root.
-    # Membership below grants the running session that access.
-    services.udev.packages = [ pkgs.swayosd ];
-    users.users.${user}.extraGroups = [ "video" ];
-
-    # The server draws the popups, so it runs for the whole graphical session.
-    # It binds to the target uwsm activates.
-    home-manager.users.${user}.systemd.user.services.swayosd = {
-      Unit = {
-        Description = "SwayOSD on-screen display server";
-        PartOf = [ "graphical-session.target" ];
-        After = [ "graphical-session.target" ];
-      };
-      Service = {
-        ExecStart = "${pkgs.swayosd}/bin/swayosd-server";
-        Restart = "on-failure";
-      };
-      Install.WantedBy = [ "graphical-session.target" ];
     };
   };
 }

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

@@ -7,13 +7,13 @@
 }:
 # Keybound screen recording: pick a region, then toggle a video-only capture.
 let
-  # A single key both starts and stops.
+  # A single key starts and stops recording.
-  # A running wf-recorder is stopped with SIGINT so it finalises the file.
+  # Waybar refreshes on state changes instead of polling.
-  # Otherwise slurp picks a region and wf-recorder runs in the foreground until
+  recordingToggle = pkgs.writeShellScript "screen-record-toggle" ''
-  # that stop arrives, so this instance lives for the whole recording and then
+    refresh_waybar() {
-  # reports it saved.
+      ${lib.getExe' pkgs.procps "pkill"} -RTMIN+10 waybar >/dev/null 2>&1 || true
-  # No -a means no audio is captured.
+    }
-  toggle = pkgs.writeShellScript "screen-record-toggle" ''
+
     if ${lib.getExe' pkgs.procps "pgrep"} -x wf-recorder >/dev/null; then
       ${lib.getExe' pkgs.procps "pkill"} -INT -x wf-recorder
       exit 0
@@ -25,12 +25,15 @@ let
     file="$dir/recording-$(${lib.getExe' pkgs.coreutils "date"} +%Y%m%d-%H%M%S).mp4"
 
     ${lib.getExe' pkgs.libnotify "notify-send"} -a "Screen recording" "Recording started" "Region capture, no audio."
-    ${lib.getExe pkgs.wf-recorder} -g "$region" -f "$file"
+    ${lib.getExe pkgs.wf-recorder} -g "$region" -f "$file" &
+    recorder=$!
+    refresh_waybar
+    wait "$recorder" || true
+    refresh_waybar
     ${lib.getExe' pkgs.libnotify "notify-send"} -a "Screen recording" "Recording saved" "$file"
   '';
 
-  # Lit while a wf-recorder capture is running.
+  # Empty text collapses the widget when recording is idle.
-  # Empty text collapses the widget when idle, so it shows nothing until then.
   recordingStatus = pkgs.writeShellScript "waybar-recording-status" ''
     if ${lib.getExe' pkgs.procps "pgrep"} -x wf-recorder >/dev/null; then
       printf '{"text":"${util.glyph "f03d"}","tooltip":"Recording","class":"recording"}\n'
@@ -48,7 +51,7 @@ in
       keys = "SUPER + SHIFT + R";
       action = {
         kind = "exec";
-        command = "${toggle}";
+        command = "${recordingToggle}";
       };
     };
 
@@ -57,7 +60,8 @@ in
       settings = {
         return-type = "json";
         exec = "${recordingStatus}";
-        interval = 1;
+        interval = "once";
+        signal = 10;
       };
     };
   };

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;
+  screenshotKey = keys: target: {
-
+    inherit keys;
-  grimblast = "${pkgs.grimblast}/bin/grimblast";
+    action = {
-  satty = "${pkgs.satty}/bin/satty";
+      kind = "exec";
-  tee = "${pkgs.coreutils}/bin/tee";
+      command = "${capture target}";
-  wl-copy = "${pkgs.wl-clipboard}/bin/wl-copy";
+    };
-  xdgUserDir = "${pkgs.xdg-user-dirs}/bin/xdg-user-dir";
+  };
 
   # Copy the original screenshot before Satty opens.
   # Satty copies and saves annotated screenshots when the user presses Enter.
   capture =
     target:
     pkgs.writeShellScript "screenshot-${target}" ''
-      dir="$(${xdgUserDir} PICTURES)/Screenshots"
+      dir="$(${lib.getExe' pkgs.xdg-user-dirs "xdg-user-dir"} PICTURES)/Screenshots"
-      mkdir -p "$dir"
+      ${lib.getExe' pkgs.coreutils "mkdir"} -p "$dir"
-      ${grimblast} save ${target} - \
+      ${lib.getExe pkgs.grimblast} save ${target} - \
-        | ${tee} >(${wl-copy}) \
+        | ${lib.getExe' pkgs.coreutils "tee"} >(${lib.getExe' pkgs.wl-clipboard "wl-copy"}) \
-        | ${satty} --filename - \
+        | ${lib.getExe pkgs.satty} --filename - \
           --output-filename "$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.${config.networking.hostName} = {
+    home-manager.users.${config.user.name} = {
-      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} = {
       # 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";
     };
   };
 }

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

@@ -6,15 +6,13 @@
 }:
 # Nord theming for the graphical layer, driven from one base16 scheme by Stylix.
 let
-
   # A single static Nord wallpaper, drawn as a vertical gradient across the
   # Polar Night shades so it needs no committed binary and no network fetch.
   wallpaper = pkgs.runCommand "nord-wallpaper.png" { } ''
-    ${pkgs.imagemagick}/bin/magick \
+    ${lib.getExe pkgs.imagemagick} \
       -size 2560x1440 gradient:'#2E3440'-'#3B4252' \
       "$out"
   '';
-  user = config.user.name;
 in
 {
   options.modules.desktop.utilities.theming.enable =
@@ -58,12 +56,8 @@ in
         };
       };
     };
-    registry.env.${config.networking.hostName} = {
-      HYPRCURSOR_THEME = config.stylix.cursor.name;
-      HYPRCURSOR_SIZE = toString config.stylix.cursor.size;
-    };
 
-    home-manager.users.${user} = {
+    home-manager.users.${config.user.name} = {
       # Stylix drives the cursor through home-manager's pointer-cursor config,
       # whose generation must be switched on explicitly.
       home.pointerCursor.enable = true;
@@ -72,5 +66,10 @@ in
       # base16 mapping Stylix would apply, so its target stays off.
       stylix.targets.nixvim.enable = false;
     };
+
+    registry.env.${config.networking.hostName} = {
+      HYPRCURSOR_THEME = config.stylix.cursor.name;
+      HYPRCURSOR_SIZE = toString config.stylix.cursor.size;
+    };
   };
 }

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

@@ -1,14 +1,27 @@
 { config, lib, ... }:
-# Declares the XDG user directories, so a tool that queries them lands in a
+# Declares XDG user directories, so tools that query them use predictable
-# well-known folder a host can relocate from one place.
+# folders a host can relocate from one place.
 let
-  user = config.user.name;
+  homeDirectory = "/home/${config.user.name}";
 in
 {
   options.modules.desktop.utilities.userdirs.enable = lib.mkEnableOption "XDG user directories";
 
   config = lib.mkIf config.modules.desktop.utilities.userdirs.enable {
-    # Write ~/.config/user-dirs.dirs from the option defaults.
+    home-manager.users.${config.user.name}.xdg.userDirs = {
-    home-manager.users.${user}.xdg.userDirs.enable = true;
+      enable = true;
+      createDirectories = true;
+      setSessionVariables = true;
+
+      desktop = "${homeDirectory}/.ignoreme";
+      documents = "${homeDirectory}/docs";
+      download = "${homeDirectory}/dwn";
+      music = "${homeDirectory}/mus";
+      pictures = "${homeDirectory}/pic";
+      publicShare = "${homeDirectory}/.ignoreme";
+      templates = "${homeDirectory}/.ignoreme";
+      videos = "${homeDirectory}/vid";
+      projects = "${homeDirectory}/.ignoreme";
+    };
   };
 }

configs/nixos/modules/shell/pi/default.nix

@@ -12,18 +12,14 @@ let
   piDir = "${config.users.users.${user}.home}/.pi/agent";
 in
 {
-  options.modules.shell.pi = {
+  options.modules.shell.pi.enable =
-    enable = lib.mkEnableOption "Pi, a terminal coding agent, configured through home-manager";
+    lib.mkEnableOption "Pi, a terminal coding agent, configured through home-manager";
-  };
 
   config = lib.mkIf config.modules.shell.pi.enable {
     home-manager.users.${user} = {
       programs.pi-coding-agent = {
         enable = true;
-        package = pkgs.pi-coding-agent.overrideAttrs {
+        package = pkgs.alexion.pi-coding-agent;
-          src = ../../../../../third_party/pi;
-          patches = [ ];
-        };
 
         settings = {
           defaultProvider = "openai-codex";

src/dotfiles/default.nix

@@ -33,7 +33,12 @@ let
     repositoryModules = modules;
     root = root + "/guests";
   };
-  modules.imports = util.collectNixFiles (root + "/modules");
+  modules.imports = [
+    {
+      nixpkgs.overlays = [ self.overlays.custom ];
+    }
+  ]
+  ++ util.collectNixFiles (root + "/modules");
 
 in
 import ./hosts.nix {

src/flake/default.nix

@@ -6,6 +6,19 @@
   system,
 }:
 {
+  overlays.custom = final: _prev: {
+    alexion = import ./packages {
+      pkgs = final;
+      inherit root;
+    };
+  };
+
+  packages.${system} =
+    (import inputs.nixpkgs {
+      inherit system;
+      overlays = [ self.overlays.custom ];
+    }).alexion;
+
   nixosConfigurations = import ../dotfiles {
     inherit
       inputs

src/flake/packages/default.nix

@@ -0,0 +1,8 @@
+{ pkgs, root }:
+{
+  pi-coding-agent = pkgs.callPackage ./pi-coding-agent.nix {
+    inherit root;
+  };
+
+  waybar = pkgs.callPackage ./waybar.nix { };
+}

src/flake/packages/pi-coding-agent.nix

@@ -0,0 +1,8 @@
+{
+  pi-coding-agent,
+  root,
+}:
+pi-coding-agent.overrideAttrs {
+  src = root + "/third_party/pi";
+  patches = [ ];
+}

src/flake/packages/waybar.nix

@@ -0,0 +1,28 @@
+{
+  fetchFromGitHub,
+  waybar,
+}:
+waybar.overrideAttrs {
+  src = fetchFromGitHub {
+    owner = "Alexays";
+    repo = "Waybar";
+    rev = "05945748dccce28bf96d26d8f64a9e69a8dd49ba";
+    hash = "sha256-51R3mIt8cLNvh/X5qe9vOqeJCj0U9KRyemVE5y+OhiU=";
+  };
+
+  postUnpack =
+    let
+      libcava = fetchFromGitHub {
+        owner = "LukashonakV";
+        repo = "cava";
+        tag = "0.10.7";
+        hash = "sha256-zkyj1vBzHtoypX4Bxdh1Vmwh967DKKxN751v79hzmgQ=";
+      };
+    in
+    ''
+      pushd "$sourceRoot"
+      cp -R --no-preserve=mode,ownership ${libcava} subprojects/cava-0.10.7
+      patchShebangs .
+      popd
+    '';
+}