nixos/home/modules/tmux-sessionizer.nix

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

let
  inherit (lib) getExe;

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

  enable = cfg.enable && tmuxCfg.enable;

  tmux-sessionizer = 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 --tmux center --preview="ls {} --color || true")
      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"
    '';
  };
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"
      ];
    };

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

  config = lib.mkIf enable {
    home.packages = [ cfg.package ];

    programs.tmux.extraConfig = ''
      bind-key -r f run-shell "tmux neww ${getExe cfg.package}"
    '';
  };
}