system/default: add prompt.nix for prompt coloring

flake.nix

@@ -5,14 +5,17 @@
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
   };
 
-  outputs = { self, nixpkgs, ... }:
-    {
+  outputs = { self, nixpkgs, ... }: {
+    # Set up formatter.
+    formatter.x86_64-linux = nixpkgs.legacyPackages.x86_64-linux.nixpkgs-fmt;
+
     # System Modules
     nixosModules.default = { ... }: {
       imports = [
         ./system/default/editor.nix
         ./system/default/nix.nix
         ./system/default/packages.nix
+        ./system/default/prompt.nix
       ];
     };
 

system/default/prompt.nix

@@ -0,0 +1,64 @@
+{ config, pkgs, ... }:
+let
+  # Define color codes
+  colors = {
+    deepSkyBlue = "38;5;39";
+    green = "38;5;70";
+    orange = "38;5;208";
+    purple = "38;5;135";
+    yellow = "38;5;226";
+    cyan = "38;5;51";
+    magenta = "38;5;201";
+    lightGreen = "38;5;118";
+    turquoise = "38;5;45";
+    purpleBlue = "38;5;99";
+    gold = "38;5;214";
+    limeGreen = "38;5;155";
+    lavender = "38;5;141";
+    teal = "38;5;80";
+    goldenYellow = "38;5;220";
+    lightPurple = "38;5;147";
+  };
+
+    # Static hostname to color mapping
+  hostnameColors = {
+    "ubi" = colors.deepSkyBlue;       # Distinct blue
+    "teb" = colors.green;             # Green
+    "wg1" = colors.orange;            # Orange
+    "t1" = colors.purple;             # Purple
+    "oc1" = colors.cyan;              # Cyan
+    "tr1" = colors.magenta;           # Magenta (distinct from tr2/tr3)
+    "tr2" = colors.lightGreen;        # Light green (different from tr1)
+    "tr3" = colors.gold;              # Gold (very different from tr1/tr2)
+    "rp1" = colors.turquoise;         # Turquoise
+    "mab" = colors.lavender;          # Lavender
+    "C02CLC7FLVDL" = colors.gold;     # Gold
+  };
+
+  # Get the current hostname
+  currentHostname = config.networking.hostName;
+
+  # Get the color for current hostname, default to teal if not in map
+  hostnameColor = hostnameColors.${currentHostname} or colors.teal;
+
+  # The prompt script
+  promptScript = ''
+    # Set prompt with static color: ${hostnameColor}
+    if [ "$EUID" -eq 0 ]; then
+      # Root prompt
+      PS1='\[\033[1;31m\][\[\033[0m\]\[\033[1;31m\]root\[\033[0m\]\[\033[1;31m\]@\[\033[0m\]\[\033[1;${hostnameColor}m\]\h\[\033[0m\]\[\033[1;31m\]:\[\033[0m\]\[\033[1;31m\]\w\[\033[0m\]\[\033[1;31m\]]\[\033[0m\]\[\033[1;31m\]#\[\033[0m\] '
+    else
+      # User prompt
+      PS1='\[\033[1;${hostnameColor}m\][\u@\h:\w]\$\[\033[0m\] '
+    fi
+  '';
+in
+{
+  # Bash prompt configuration
+  programs.bash = {
+  } // (if pkgs.stdenv.isDarwin then {
+    interactiveShellInit = promptScript;
+  } else {
+    promptInit = promptScript;
+  });
+}