Add wallpaper rotation system with upgrade workflow

- Add home/wallpapers/default.nix with per-wallpaper scaling options
- Add 5 new Metroid-themed wallpapers to the rotation
- Update i3+sway and plasma-manager to use wallpaper module
- Add scripts/rotate-wallpaper.sh to cycle through wallpapers
- Add scripts/upgrade.sh to chain: flake update, doom, claude-code, wallpaper
- Add flake apps: rotate-wallpaper, update-claude-code, upgrade
- Fix claude-code update.sh to use REPO_ROOT for flake app compatibility

Run `nix run .#upgrade` for full system update with wallpaper rotation.

flake.nix

@@ -234,15 +234,44 @@
     apps = nixpkgs.lib.genAttrs [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" ] (system:
       let
         pkgs = import nixpkgs { inherit system; };
+        commonDeps = [ pkgs.curl pkgs.jq pkgs.nix pkgs.git pkgs.gnused pkgs.gnugrep pkgs.coreutils pkgs.gawk ];
+
         update-doomemacs = pkgs.writeShellScriptBin "update-doomemacs" ''
-          export PATH="${pkgs.lib.makeBinPath [ pkgs.curl pkgs.jq pkgs.nix pkgs.git pkgs.gnused pkgs.gnugrep pkgs.coreutils ]}:$PATH"
+          export PATH="${pkgs.lib.makeBinPath commonDeps}:$PATH"
           ${builtins.readFile ./scripts/update-doomemacs.sh}
         '';
+
+        update-claude-code = pkgs.writeShellScriptBin "update-claude-code" ''
+          export PATH="${pkgs.lib.makeBinPath commonDeps}:$PATH"
+          ${builtins.readFile ./packages/claude-code/update.sh}
+        '';
+
+        rotate-wallpaper = pkgs.writeShellScriptBin "rotate-wallpaper" ''
+          export PATH="${pkgs.lib.makeBinPath commonDeps}:$PATH"
+          ${builtins.readFile ./scripts/rotate-wallpaper.sh}
+        '';
+
+        upgrade = pkgs.writeShellScriptBin "upgrade" ''
+          export PATH="${pkgs.lib.makeBinPath commonDeps}:$PATH"
+          ${builtins.readFile ./scripts/upgrade.sh}
+        '';
       in {
         update-doomemacs = {
           type = "app";
           program = "${update-doomemacs}/bin/update-doomemacs";
         };
+        update-claude-code = {
+          type = "app";
+          program = "${update-claude-code}/bin/update-claude-code";
+        };
+        rotate-wallpaper = {
+          type = "app";
+          program = "${rotate-wallpaper}/bin/rotate-wallpaper";
+        };
+        upgrade = {
+          type = "app";
+          program = "${upgrade}/bin/upgrade";
+        };
       }
     );
   };

home/roles/i3+sway/default.nix

@@ -4,6 +4,8 @@ with lib;
 
 let
   cfg = config.home.roles.i3_sway;
+  wallpaperConfig = import ../../wallpapers;
+  currentWallpaper = builtins.elemAt wallpaperConfig.wallpapers wallpaperConfig.currentIndex;
 
   shared_config = recursiveUpdate rec {
     modifier = "Mod4";
@@ -281,7 +283,7 @@ in {
           }
           # Set wallpaper with feh
           {
-            command = "feh --bg-scale ${../../wallpapers/metroid-samus-returns-kz-3440x1440.jpg}";
+            command = "feh ${currentWallpaper.feh} ${currentWallpaper.file}";
             always = false;
             notification = false;
           }
@@ -314,7 +316,7 @@ in {
         };
         output = {
           "*" = {
-            bg = "${../../wallpapers/metroid-samus-returns-kz-3440x1440.jpg} fill";
+            bg = "${currentWallpaper.file} ${currentWallpaper.sway}";
           };
         };
         startup = [

home/roles/plasma-manager/default.nix

@@ -4,6 +4,8 @@ with lib;
 
 let
   cfg = config.home.roles.plasma-manager;
+  wallpaperConfig = import ../../wallpapers;
+  currentWallpaper = builtins.elemAt wallpaperConfig.wallpapers wallpaperConfig.currentIndex;
 in
 {
   options.home.roles.plasma-manager = {
@@ -181,7 +183,7 @@ in
         plasma-localerc.Formats.LANG = "en_US.UTF-8";
 
         # Set wallpaper for all desktops
-        plasmarc.Wallpapers.usersWallpapers = "${../../wallpapers/metroid-samus-returns-kz-3440x1440.jpg}";
+        plasmarc.Wallpapers.usersWallpapers = "${currentWallpaper.file}";
       };
     };
   };

home/wallpapers/default.nix

@@ -0,0 +1,45 @@
+# Wallpaper rotation system
+# The currentIndex is incremented by `nix run .#rotate-wallpaper`
+# and gets committed as part of `nix run .#upgrade`
+{
+  currentIndex = 1;  # Index into wallpapers list
+
+  wallpapers = [
+    {
+      name = "metroid-samus-returns";
+      file = ./metroid-samus-returns-kz-3440x1440.jpg;
+      sway = "fill";
+      feh = "--bg-fill";
+    }
+    {
+      name = "metroid3_map";
+      file = ./metroid3_map.gif;
+      sway = "fit";
+      feh = "--bg-max";
+    }
+    {
+      name = "super-metroid-gunship-cavern";
+      file = ./super-metroid-gunship-cavern.jpg;
+      sway = "fit";
+      feh = "--bg-max";
+    }
+    {
+      name = "super-metroid-samus-statue";
+      file = ./super-metroid-samus-statue.png;
+      sway = "fit";
+      feh = "--bg-max";
+    }
+    {
+      name = "metroid-samus-action-4k";
+      file = ./metroid-samus-action-4k.jpg;
+      sway = "fit";
+      feh = "--bg-max";
+    }
+    {
+      name = "metroid-creature-minimalist";
+      file = ./metroid-creature-minimalist.jpg;
+      sway = "fit";
+      feh = "--bg-max";
+    }
+  ];
+}

packages/claude-code/update.sh

@@ -33,7 +33,8 @@ YELLOW='\033[1;33m'
 NC='\033[0m' # No Color
 
 CASK_URL="https://raw.githubusercontent.com/Homebrew/homebrew-cask/HEAD/Casks/c/claude-code.rb"
-NIX_FILE="$(dirname "$0")/default.nix"
+REPO_ROOT="${REPO_ROOT:-$(git rev-parse --show-toplevel 2>/dev/null || pwd)}"
+NIX_FILE="$REPO_ROOT/packages/claude-code/default.nix"
 
 echo "Fetching latest claude-code version from Homebrew cask..."
 

scripts/rotate-wallpaper.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+# Configuration
+REPO_ROOT="${REPO_ROOT:-$(git rev-parse --show-toplevel 2>/dev/null || pwd)}"
+WALLPAPER_FILE="$REPO_ROOT/home/wallpapers/default.nix"
+
+echo -e "${GREEN}Rotating wallpaper...${NC}"
+
+# Check if file exists
+if [[ ! -f "$WALLPAPER_FILE" ]]; then
+    echo -e "${RED}Error: $WALLPAPER_FILE not found${NC}"
+    exit 1
+fi
+
+# Get current index
+CURRENT_INDEX=$(grep -oP 'currentIndex = \K\d+' "$WALLPAPER_FILE")
+echo -e "Current index: ${YELLOW}$CURRENT_INDEX${NC}"
+
+# Count wallpapers (count occurrences of "name = " in the wallpapers list)
+WALLPAPER_COUNT=$(grep -c 'name = "' "$WALLPAPER_FILE")
+echo -e "Total wallpapers: ${YELLOW}$WALLPAPER_COUNT${NC}"
+
+# Calculate next index (wrap around)
+NEXT_INDEX=$(( (CURRENT_INDEX + 1) % WALLPAPER_COUNT ))
+echo -e "Next index: ${YELLOW}$NEXT_INDEX${NC}"
+
+# Update the currentIndex
+sed -i "s/currentIndex = $CURRENT_INDEX;/currentIndex = $NEXT_INDEX;/" "$WALLPAPER_FILE"
+
+echo -e "${GREEN}Successfully rotated wallpaper!${NC}"
+echo -e "  Old index: ${YELLOW}$CURRENT_INDEX${NC}"
+echo -e "  New index: ${YELLOW}$NEXT_INDEX${NC}"
+echo ""
+echo "Rebuild your system to apply the new wallpaper."

scripts/upgrade.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BLUE='\033[0;34m'
+NC='\033[0m' # No Color
+
+REPO_ROOT="${REPO_ROOT:-$(git rev-parse --show-toplevel 2>/dev/null || pwd)}"
+
+echo -e "${BLUE}========================================${NC}"
+echo -e "${BLUE}  NixOS Configuration Major Upgrade${NC}"
+echo -e "${BLUE}========================================${NC}"
+echo ""
+
+# Step 1: Update flake inputs
+echo -e "${GREEN}[1/4] Updating flake inputs...${NC}"
+cd "$REPO_ROOT"
+nix flake update
+echo ""
+
+# Step 2: Update Doom Emacs
+echo -e "${GREEN}[2/4] Updating Doom Emacs...${NC}"
+"$REPO_ROOT/scripts/update-doomemacs.sh"
+echo ""
+
+# Step 3: Update Claude Code
+echo -e "${GREEN}[3/4] Updating Claude Code...${NC}"
+"$REPO_ROOT/packages/claude-code/update.sh"
+echo ""
+
+# Step 4: Rotate wallpaper
+echo -e "${GREEN}[4/4] Rotating wallpaper...${NC}"
+"$REPO_ROOT/scripts/rotate-wallpaper.sh"
+echo ""
+
+echo -e "${BLUE}========================================${NC}"
+echo -e "${GREEN}Upgrade complete!${NC}"
+echo -e "${BLUE}========================================${NC}"
+echo ""
+echo "Next steps:"
+echo "  1. Review changes: git diff"
+echo "  2. Rebuild system: sudo nixos-rebuild switch --flake ."
+echo "  3. If satisfied, commit: git add -A && git commit -m 'chore: Major upgrade'"