feat(home): Add starship cross-shell prompt role

Add a new home-manager role for starship.rs, a fast and customizable
cross-shell prompt written in Rust.

Configuration includes:
- Bash and Zsh integration enabled
- Clean character symbols (> for success, x for error)
- Vi mode indicator support
- Smart directory truncation (4 levels, truncate to repo root)
- Git branch and status display
- Nix shell indicator with snowflake symbol
- Command duration for long-running commands (2s+)
- Disabled noisy modules (language runtimes, cloud providers)

Enabled in: home-desktop, home-laptop-compact, home-live-usb,
home-media-center configurations.

Closes: nixos-configs-uji

flake.lock

@@ -21,45 +21,6 @@
         "type": "github"
       }
     },
-    "doomemacs": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1767773143,
-        "narHash": "sha256-QL/t9v2kFNxBDyNJb/s411o3mxujan+QX5IZglTdpTk=",
-        "owner": "doomemacs",
-        "repo": "doomemacs",
-        "rev": "3e15fb36d7f94f0a218bda977be4d3f5da983a71",
-        "type": "github"
-      },
-      "original": {
-        "owner": "doomemacs",
-        "repo": "doomemacs",
-        "type": "github"
-      }
-    },
-    "emacs-overlay": {
-      "inputs": {
-        "nixpkgs": [
-          "nix-doom-emacs-unstraightened"
-        ],
-        "nixpkgs-stable": [
-          "nix-doom-emacs-unstraightened"
-        ]
-      },
-      "locked": {
-        "lastModified": 1768011937,
-        "narHash": "sha256-SnU2XTo34vwVaijs+4VwcXTNwMWO4nwzzs08N39UagA=",
-        "owner": "nix-community",
-        "repo": "emacs-overlay",
-        "rev": "79abf71d9897cf3b5189f7175cda1b1102abc65c",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "emacs-overlay",
-        "type": "github"
-      }
-    },
     "flake-compat": {
       "flake": false,
       "locked": {
@@ -198,27 +159,6 @@
         "type": "github"
       }
     },
-    "nix-doom-emacs-unstraightened": {
-      "inputs": {
-        "doomemacs": "doomemacs",
-        "emacs-overlay": "emacs-overlay",
-        "nixpkgs": [],
-        "systems": "systems_2"
-      },
-      "locked": {
-        "lastModified": 1768034604,
-        "narHash": "sha256-62pIZMvGHhYJmMiiBsxHqZt/dFyENPcFHlJq5NJF3Sw=",
-        "owner": "marienz",
-        "repo": "nix-doom-emacs-unstraightened",
-        "rev": "9b3b8044fe4ccdcbb2d6f733d7dbe4d5feea18bc",
-        "type": "github"
-      },
-      "original": {
-        "owner": "marienz",
-        "repo": "nix-doom-emacs-unstraightened",
-        "type": "github"
-      }
-    },
     "nix-github-actions": {
       "inputs": {
         "nixpkgs": [
@@ -363,7 +303,6 @@
         "home-manager-unstable": "home-manager-unstable",
         "jovian": "jovian",
         "nix-darwin": "nix-darwin",
-        "nix-doom-emacs-unstraightened": "nix-doom-emacs-unstraightened",
         "nixos-wsl": "nixos-wsl",
         "nixpkgs": "nixpkgs_2",
         "nixpkgs-unstable": "nixpkgs-unstable",
@@ -385,21 +324,6 @@
         "repo": "default",
         "type": "github"
       }
-    },
-    "systems_2": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
     }
   },
   "root": "root",

flake.nix

@@ -47,12 +47,6 @@
       url = "github:steveyegge/beads";
       inputs.nixpkgs.follows = "nixpkgs-unstable";
     };
-
-    nix-doom-emacs-unstraightened = {
-      url = "github:marienz/nix-doom-emacs-unstraightened";
-      # Don't follow nixpkgs to avoid rebuild issues with emacs-overlay
-      inputs.nixpkgs.follows = "";
-    };
   };
 
   outputs = { self, nixpkgs, nixpkgs-unstable, nixos-wsl, ... } @ inputs: let
@@ -76,7 +70,6 @@
         home-manager.useUserPackages = true;
         home-manager.sharedModules = [
           inputs.plasma-manager.homeModules.plasma-manager
-          inputs.nix-doom-emacs-unstraightened.homeModule
         ];
         home-manager.extraSpecialArgs = {
           globalInputs = inputs;
@@ -105,7 +98,6 @@
         home-manager.useUserPackages = true;
         home-manager.sharedModules = [
           inputs.plasma-manager-unstable.homeModules.plasma-manager
-          inputs.nix-doom-emacs-unstraightened.homeModule
         ];
         home-manager.extraSpecialArgs = {
           globalInputs = inputs;
@@ -137,9 +129,6 @@
         ];
         home-manager.useGlobalPkgs = true;
         home-manager.useUserPackages = true;
-        home-manager.sharedModules = [
-          inputs.nix-doom-emacs-unstraightened.homeModule
-        ];
         home-manager.extraSpecialArgs = {
           globalInputs = inputs;
         };

home/home-desktop.nix

@@ -23,6 +23,7 @@
     kubectl.enable = true;
     tmux.enable = true;
     plasma-manager.enable = true;
+    starship.enable = true;
   };
 
   targets.genericLinux.enable = true;

home/home-laptop-compact.nix

@@ -23,6 +23,7 @@
     plasma-manager.enable = true;
     emacs.enable = true;
     i3_sway.enable = true;
+    starship.enable = true;
 
     # Launcher wrappers for excluded/optional packages
     launchers = {

home/home-live-usb.nix

@@ -14,13 +14,9 @@
     desktop.enable = true;
     tmux.enable = true;
     plasma-manager.enable = true;
-    emacs = {
+    emacs.enable = true;
-      enable = true;
-      # Use pre-built Doom Emacs - all packages built at nix build time
-      # This means no doom sync is needed after booting the live USB
-      prebuiltDoom = true;
-    };
     i3_sway.enable = true;
+    starship.enable = true;
     # development.enable = false;  # Not needed for live USB
     # communication.enable = false; # Not needed for live USB
     # office.enable = false;       # Not needed for live USB

home/home-media-center.nix

@@ -20,6 +20,7 @@
     plasma-manager.enable = true;
     emacs.enable = true;
     i3_sway.enable = true;
+    starship.enable = true;
     # office.enable = false;    # Not needed for media center
     # sync.enable = false;      # Shared machine, no personal file sync
   };

home/roles/default.nix

@@ -19,5 +19,6 @@
     ./sync
     ./tmux
     ./emacs
+    ./starship
   ];
 }

home/roles/emacs/default.nix

@@ -23,90 +23,55 @@ let
     if pkgs.stdenv.isDarwin
     then pkgs.emacs-macport.pkgs.withPackages emacsPackages
     else pkgs.emacs.pkgs.withPackages emacsPackages;
-
-  # Path to doom config directory (relative to this file)
-  doomConfigDir = ./doom;
 in
 {
   options.home.roles.emacs = {
     enable = mkEnableOption "Doom Emacs with vterm and tree-sitter support";
-
-    prebuiltDoom = mkOption {
-      type = types.bool;
-      default = false;
-      description = ''
-        Use nix-doom-emacs-unstraightened to pre-build all Doom packages at
-        nix build time. This eliminates the need to run `doom sync` after
-        first boot, making it ideal for live USB images or immutable systems.
-
-        When enabled, the doom configuration is read-only (stored in nix store).
-      '';
-    };
   };
 
-  config = mkIf cfg.enable (mkMerge [
+  config = mkIf cfg.enable {
-    # Common configuration for both modes
+    home.packages = [
-    {
+      pkgs.emacs-all-the-icons-fonts
-      home.packages = [
+      pkgs.fira-code
-        pkgs.emacs-all-the-icons-fonts
+      pkgs.fontconfig
-        pkgs.fira-code
+      pkgs.graphviz
-        pkgs.fontconfig
+      pkgs.isort
-        pkgs.graphviz
+      pkgs.nerd-fonts.fira-code
-        pkgs.isort
+      pkgs.nerd-fonts.droid-sans-mono
-        pkgs.nerd-fonts.fira-code
+      pkgs.nil # nix lsp language server
-        pkgs.nerd-fonts.droid-sans-mono
+      pkgs.nixfmt-rfc-style
-        pkgs.nil # nix lsp language server
+      (pkgs.ripgrep.override {withPCRE2 = true;})
-        pkgs.nixfmt-rfc-style
+      pkgs.pipenv
-        (pkgs.ripgrep.override {withPCRE2 = true;})
+      pkgs.poetry
-        pkgs.pipenv
+      pkgs.python3
-        pkgs.poetry
+    ];
-        pkgs.python3
-      ];
 
-      fonts.fontconfig.enable = true;
+    programs.emacs = {
-    }
+      enable = true;
+      package = defaultEmacsPackage;
+    };
 
-    # Standard Doom Emacs mode (requires doom sync at runtime)
+    fonts.fontconfig.enable = true;
-    (mkIf (!cfg.prebuiltDoom) {
-      programs.emacs = {
-        enable = true;
-        package = defaultEmacsPackage;
-      };
 
-      # Mount emacs and tree-sitter grammars from nix store
+    # Mount emacs and tree-sitter grammars from nix store
-      home.file = {
+    home.file = {
-        "${config.xdg.configHome}/emacs".source = doomEmacs;
+      "${config.xdg.configHome}/emacs".source = doomEmacs;
-      };
+    };
 
-      home.sessionPath = [
+    home.sessionPath = [
-        "${config.xdg.configHome}/emacs/bin"
+      "${config.xdg.configHome}/emacs/bin"
-      ];
+    ];
 
-      home.sessionVariables = {
+    home.sessionVariables = {
-        DOOMDIR = "${config.xdg.configHome}/doom";
+      DOOMDIR = "${config.xdg.configHome}/doom";
-        DOOMLOCALDIR = "${config.xdg.dataHome}/doom";
+      DOOMLOCALDIR = "${config.xdg.dataHome}/doom";
-      };
+    };
 
-      # TODO: Use mkOutOfStoreSymlink instead?
+    # TODO: Use mkOutOfStoreSymlink instead?
-      home.activation.doomConfig = lib.hm.dag.entryAfter ["writeBoundary"] ''
+    home.activation.doomConfig = lib.hm.dag.entryAfter ["writeBoundary"] ''
-        # Always remove and recreate the symlink to ensure it points to the source directory
+      # Always remove and recreate the symlink to ensure it points to the source directory
-        rm -rf "${config.xdg.configHome}/doom"
+      rm -rf "${config.xdg.configHome}/doom"
-        ln -sf "${config.home.homeDirectory}/nixos-configs/home/roles/emacs/doom" "${config.xdg.configHome}/doom"
+      ln -sf "${config.home.homeDirectory}/nixos-configs/home/roles/emacs/doom" "${config.xdg.configHome}/doom"
-      '';
+    '';
-    })
+  };
-
-    # Pre-built Doom Emacs mode (no doom sync needed - ideal for live USB)
-    (mkIf cfg.prebuiltDoom {
-      programs.doom-emacs = {
-        enable = true;
-        doomDir = doomConfigDir;
-        doomLocalDir = "${config.xdg.dataHome}/doom";
-        # Add extra packages that aren't part of Doom but needed for our config
-        extraPackages = epkgs: [
-          epkgs.vterm
-          epkgs.treesit-grammars.with-all-grammars
-        ];
-      };
-    })
-  ]);
 }

home/roles/emacs/doom/packages.el

@@ -51,21 +51,11 @@
 
 ;; (package! org-caldav)
 
-;; Note: Packages with custom recipes must be pinned for nix-doom-emacs-unstraightened
-;; to build deterministically. Update pins when upgrading packages.
-
 (package! gptel :recipe (:nonrecursive t))
 
 (package! claude-code-ide
-  :recipe (:host github :repo "manzaltu/claude-code-ide.el")
+  :recipe (:host github :repo "manzaltu/claude-code-ide.el"))
-  :pin "760240d7f03ff16f90ede9d4f4243cd94f3fed73")
 
 (package! gptel-tool-library
   :recipe (:host github :repo "aard-fi/gptel-tool-library"
-           :files ("*.el"))
+           :files ("*.el")))
-  :pin "baffc3b0d74a2b7cbda0d5cd6dd7726d6ccaca83")
-
-(package! beads
-  :recipe (:type git :repo "https://codeberg.org/ctietze/beads.el.git"
-           :files ("lisp/*.el"))
-  :pin "f40a6461d3c0fa0969311bbb6a1e30d1bba86c88")

home/roles/starship/default.nix

@@ -0,0 +1,72 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.home.roles.starship;
+in
+{
+  options.home.roles.starship = {
+    enable = mkEnableOption "starship cross-shell prompt";
+  };
+
+  config = mkIf cfg.enable {
+    programs.starship = {
+      enable = true;
+      enableBashIntegration = true;
+      enableZshIntegration = true;
+
+      settings = {
+        add_newline = true;
+
+        character = {
+          success_symbol = "[>](bold green)";
+          error_symbol = "[x](bold red)";
+          vimcmd_symbol = "[<](bold green)";
+        };
+
+        directory = {
+          truncation_length = 4;
+          truncate_to_repo = true;
+        };
+
+        git_branch = {
+          symbol = "";
+          format = "[$symbol$branch(:$remote_branch)]($style) ";
+        };
+
+        git_status = {
+          format = "([$all_status$ahead_behind]($style) )";
+        };
+
+        nix_shell = {
+          symbol = "";
+          format = "[$symbol$state( \\($name\\))]($style) ";
+        };
+
+        cmd_duration = {
+          min_time = 2000;
+          format = "[$duration]($style) ";
+        };
+
+        # Disable modules that are noisy or rarely needed
+        package.disabled = true;
+        nodejs.disabled = true;
+        python.disabled = true;
+        ruby.disabled = true;
+        java.disabled = true;
+        golang.disabled = true;
+        rust.disabled = true;
+        php.disabled = true;
+        lua.disabled = true;
+        perl.disabled = true;
+        terraform.disabled = true;
+        kubernetes.disabled = true;
+        docker_context.disabled = true;
+        aws.disabled = true;
+        gcloud.disabled = true;
+        azure.disabled = true;
+      };
+    };
+  };
+}