nixos/home/modules/tmux-sessionizer.nix

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

let
  inherit (lib) getExe getExe';

  cfg = config.snowhawk.tmux.sessionizer;
  tmuxCfg = config.snowhawk.tmux;

  enable = cfg.enable && tmuxCfg.enable;
in
{
  options.snowhawk.tmux.sessionizer = {
    enable = lib.mkEnableOption "tmux-sessionizer home-manager module";

    paths = lib.mkOption {
      type = with lib.types; listOf str;
      description = ''
        list of paths to select with tmux-sessionizer
      '';
      default = [ ];
      example = [
        "~"
        "~/projects"
        "~/src"
      ];
    };

    pkg = lib.mkOption {
      type = lib.types.package;
      description = ''
        tmux-sessionizer binary package
      '';
    };
  };

  config = lib.mkIf enable {
    snowhawk.tmux.sessionizer.pkg =
      lib.mkDefault (pkgs.writeShellApplication {
        name = "tmux-sessionizer";
        runtimeInputs = with pkgs; [ tmux fzf findutils coreutils procps ];
        text = ''
          if [[ $# -eq 1 ]]; then
            selected=$1
          else
            selected=$(find -L ${lib.concatStringsSep " " cfg.paths} -mindepth 1 -maxdepth 1 -type d | fzf)
          fi

          if [[ -z $selected ]]; then
            exit 0
          fi

          selected_name=$(basename "$selected" | tr . _)
          tmux_running=$(pgrep tmux)

          if [[ -z $TMUX ]] && [[ -z $tmux_running ]]; then
            tmux new-session -s "$selected_name" -c "$selected"
            exit 0
          fi

          if ! tmux has-session -t="$selected_name" 2>/dev/null; then
            tmux new-session -ds "$selected_name" -c "$selected"
          fi

          tmux switch-client -t "$selected_name"
        '';
      });

    home.packages = [ cfg.pkg ];
  };
}