machine_setup/nix/configuration/roles/zsh/default.nix

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

let
  zshrc = pkgs.writeTextFile {
    name = ".zshrc";
    text = ''
      # Lines configured by zsh-newuser-install
      HISTFILE=~/.zhistory
      HISTSIZE=100000
      SAVEHIST=100000
      setopt appendhistory notify
      unsetopt beep
      bindkey -e
      # End of lines configured by zsh-newuser-install
      # The following lines were added by compinstall
      #

      # Use menu complete immediately instead of after the first tab
      setopt MENU_COMPLETE

      zstyle :compinstall filename "$HOME/.zshrc"

      autoload -Uz compinit
      compinit
      # End of lines added by compinstall

      # Enable the 2d menu for tab completion
      zstyle ':completion:*' menu select

      autoload colors zsh/terminfo
      if [[ "$terminfo[colors]" -ge 8 ]]; then
          colors
      fi
      for color in RED GREEN YELLOW BLUE MAGENTA CYAN WHITE; do
          eval PR_$color='%{$terminfo[bold]$fg[''${(L)color}]%}'
          eval PR_LIGHT_$color='%{$fg[''${(L)color}]%}'
          (( count = $count + 1 ))
      done
      PR_NO_COLOR="%{$terminfo[sgr0]%}"
      PS1="[$PR_BLUE%n$PR_WHITE@$PR_GREEN%U%m%u$PR_NO_COLOR:$PR_RED%2c$PR_NO_COLOR]%(!.#.$) "

      source ${pkgs.zsh-histdb}/share/zsh/plugins/zsh-histdb/sqlite-history.zsh
      autoload -Uz add-zsh-hook

      source ${pkgs.zsh-histdb}/share/zsh/plugins/zsh-histdb/histdb-interactive.zsh
      bindkey '^r' _histdb-isearch
    '';
  };
in
{
  imports = [ ];

  options.me = {
    zsh.enable = lib.mkOption {
      type = lib.types.bool;
      default = false;
      example = true;
      description = "Whether we want to install zsh.";
    };
  };

  config = lib.mkIf config.me.zsh.enable (
    lib.mkMerge [
      {
        environment.systemPackages = with pkgs; [
          zsh
        ];

        users.users.talexander.shell = pkgs.zsh;
        environment.shells = with pkgs; [ zsh ];

        programs.zsh = {
          enable = true;
        };

        home-manager.users.talexander =
          { pkgs, ... }:
          {
            home.file.".zshrc" = {
              source = "${zshrc}";
            };
          };

        environment.persistence."/persist" = lib.mkIf (!config.me.buildingIso) {
          hideMounts = true;
          users.talexander = {
            directories = [
              {
                directory = ".histdb";
                user = "talexander";
                group = "talexander";
                mode = "0700";
              }
            ];
          };
        };
      }
    ]
  );
}