#Setup of the Starship theme switcher

You can get my latest catppucin mocha starship-configs (blue-ish gradient, green & red) at my nix-config repo, or just use your own ones. If using yours make sure to adjust the names of the themes.

Little explanation, what this does is basically just two things:

you have all your "themes" as seperate starship config files in a folder under /etc/nixos

the small script just symlinks the starship config (~/.config/starship.toml) to either one of them

Put all themed starship configs into the directory /etc/nixos/home/starship-themes:

/etc/nixos/home
├── username.nix
└── starship-themes
    ├── red.toml
    ├── blue.toml
    └── green.toml

#Setup for homemanger

In your /etc/nixos/home/username.nix add the following to enable starship if not already done (here for fish & bash, just use your shell):

programs.starship = {
  enable = true;
 
  enableBashIntegration = true;
  enableFishIntegration = true;
};
programs.fish.enable = true;
programs.bash.enable = true;

To populate the starship config file:

# Create initial symlink (only runs if file doesn't exist)
home.activation.setupStarshipTheme = config.lib.dag.entryAfter ["writeBoundary"] ''
  if [ ! -e "$HOME/.config/starship.toml" ]; then
    $DRY_RUN_CMD ln -s "/etc/nixos/home/starship-themes/blue.toml" "$HOME/.config/starship.toml"
  fi
'';

And at the end we'll have to add the script to switch themes (you can import it form an other file etc as well oc):

# User Packages
home.packages = with pkgs; [
  starship
  
  # your other packages
 
  (pkgs.writeShellScriptBin "starship-theme" ''
    THEME="$1"
    THEMES="/etc/nixos/home/starship-themes"
    ACTIVE="$HOME/.config/starship.toml"
 
    if [[ ! "$THEME" =~ ^(red|blue|green)$ ]]; then
      echo "Usage: starship-theme [red|blue|green]"
      exit 1
    fi
 
    ln -sf "$THEMES/$THEME.toml" "$ACTIVE"
    echo "✨ Starship theme switched to $THEME"
  '')
];

Now you just have to rebuild, and run starship-theme red for example
Have fun ;)

Nix Starship Themes

#Setup of the Starship theme switcher

#Setup for homemanger