home-manager/modules/programs/oh-my-zsh.nix

{ config, lib, pkgs, ... }:

with lib;

let

  cfg = config.programs.zsh.oh-my-zsh;

in

{
  options = {
    programs.zsh.oh-my-zsh = {
      enable = mkEnableOption "oh-my-zsh";

      plugins = mkOption {
        default = [];
        example = [ "git" "sudo" ];
        type = types.listOf types.str;
        description = ''
          List of oh-my-zsh plugins
        '';
      };

      custom = mkOption {
        default = "";
        type = types.str;
        example = "$HOME/my_customizations";
        description = ''
          Path to a custom oh-my-zsh package to override config of oh-my-zsh.
          See: https://github.com/robbyrussell/oh-my-zsh/wiki/Customization
        '';
      };

      theme = mkOption {
        default = "";
        example = "robbyrussell";
        type = types.str;
        description = ''
          Name of the theme to be used by oh-my-zsh.
        '';
      };
    };
  };

  config = mkIf cfg.enable {
    home.packages = [ pkgs.oh-my-zsh ];

    programs.zsh.initExtra = with pkgs; ''
      # oh-my-zsh configuration generated by NixOS
      export ZSH=${oh-my-zsh}/share/oh-my-zsh
      export ZSH_CACHE_DIR=''${XDG_CACHE_HOME:-$HOME/.cache}/oh-my-zsh

      ${optionalString (cfg.plugins != [])
        "plugins=(${concatStringsSep " " cfg.plugins})"
      }
      ${optionalString (cfg.custom != "")
        "ZSH_CUSTOM=\"${cfg.custom}\""
      }
      ${optionalString (cfg.theme != "")
        "ZSH_THEME=\"${cfg.theme}\""
      }
      source $ZSH/oh-my-zsh.sh
    '';
  };
}