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{ stdenv, lib, pkgs, makeWrapper }:

rec {
  # Begin API
  buildBaseReaktorPlugin = { name
                        , config # python extra configuration for plugin
                        , phases ? []
                        , ... } @ attrs:
    stdenv.mkDerivation (attrs // {
      name = "Reaktor-plugin-" + name;
      isReaktorPlugin = true;
    });

  buildSimpleReaktorPlugin = name: { script
                        , path ? []
                        , env ? {}
                        , append_rule ? false # append the rule instead of insert
                        , pattern ? ""
                        , ... } @ attrs:
    let
      path_env = { "PATH" = lib.makeSearchPath "bin" (path ++ [ pkgs.coreutils ]); };
      src_dir = pkgs.substituteAll ( {
        inherit name;
        dir = "bin";
        isExecutable = true;
        src = script;
      });
      src_file = "${src_dir}/bin/${name}";
      config = ''
        public_commands.${if append_rule then "append(" else "insert(0," }{
          'capname' : "${name}",
          'pattern' : ${if pattern == "" then
                          ''indirect_pattern.format("${name}")'' else
                          ''"${pattern}"'' },
          'argv'    : ["${src_file}"],
          'env'     : ${builtins.toJSON (path_env // env)} })
      '';
      config_file = pkgs.writeText "plugin.py" config;
    in buildBaseReaktorPlugin (attrs // rec {
      inherit name config;

      phases = [ "installPhase" ];
      buildInputs = [ makeWrapper ];
      installPhase = ''
        mkdir -p $out/bin $out/etc/Reaktor
        ln -s ${src_file} $out/bin
        wrapProgram $out/bin/${name} \
          --prefix PATH : ${path_env.PATH}
        ln -s ${config_file} $out/etc/Reaktor/plugin.py
      '';

    });
  # End API

  # Begin Plugins
  random-emoji = buildSimpleReaktorPlugin "emoji" {
    path = with pkgs; [ gnused gnugrep xmlstarlet curl ];
    script = ./scripts/random-emoji.sh;
  };

  sed-plugin = buildSimpleReaktorPlugin "sed-plugin" {
    path = [ pkgs.gnused pkgs.python3 ];
    # only support s///gi the plugin needs to see every msg
    # TODO: this will eat up the last regex, fix Reaktor to support fallthru
    append_rule = true;
    pattern = "^(?P<args>.*)$$";
    script = ./scripts/sed-plugin.py;
  };

  shack-correct = buildSimpleReaktorPlugin "shack-correct" {
    path = [ pkgs.gnused ];
    pattern = "^(?P<args>.*Shack.*)$$";
    script = ./scripts/shack-correct.sh;
  };

  nixos-version = buildSimpleReaktorPlugin "nixos-version" {
    script = pkgs.writeDash "nixos-version" ''
      . /etc/os-release
      echo "$PRETTY_NAME"
      '';
  };
  stockholm-issue = buildSimpleReaktorPlugin "stockholm-issue" {
    script = ./scripts/random-issue.sh;
    path = with pkgs; [ git gnused haskellPackages.lentil ];
    env = { "origin" = "http://cgit.gum/stockholm"; };
  };

  titlebot =
  let
    pypkgs = pkgs.python3Packages;
    titlebot_cmds =  pypkgs.buildPythonPackage {
      name = "titlebot_cmds";
      propagatedBuildInputs =  with pypkgs; [ setuptools ];
      src = pkgs.fetchurl {
        url = "https://github.com/makefu/reaktor-titlebot/archive/2.1.0.tar.gz";
        sha256 = "0wvf09wmk8b52f9j65qrw81nwrhs9pfhijwrlkzp5l7l2q8cjkp6";
        };
      };
  in buildBaseReaktorPlugin rec {
    name = "titlebot";
    phases = [ "installPhase" ];
    installPhase = ''
      mkdir -p $out
      ln -s ${titlebot_cmds}/* $out
    '';
    config = ''
      def titlebot_cmd(cmd):
        from os import environ
        return {  'capname': None,
                  'env': { 'TITLEDB':
                    environ['state_dir']+'/suggestions.json' },
                  'pattern': '^\\.' + cmd + '\\s*(?:\\s+(?P<args>.*))?$$',
                  'argv': [ '${titlebot_cmds}/bin/' + cmd ] }
      for i in ['up','help','list','top','new']:
        public_commands.insert(0,titlebot_cmd(i))
      commands.insert(0,titlebot_cmd('clear'))
    '';
  };

  url-title = (buildSimpleReaktorPlugin "url-title" {
    pattern = "^.*(?P<args>http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+).*$$";
    path = with pkgs; [ curl perl ];
    script = pkgs.writePython3 [ "beautifulsoup4" "lxml" ] "url-title" ''
      import sys
      import urllib.request
      from bs4 import BeautifulSoup

      try:
          soup = BeautifulSoup(urllib.request.urlopen(sys.argv[1]), "lxml")
          title = soup.find('title').string

          if title:
              if len(title) > 512:
                  print('message to long, skipped')
              elif len(title.split('\n')) > 5:
                  print('to many lines, skipped')
              else:
                  print(title)
      except:  # noqa: E722
          pass
    '';
  });

  taskwarrior = buildSimpleReaktorPlugin "task" {
    pattern = "^task: (?P<args>.*)$$";
    script = pkgs.writeDash "task-wrapper" ''
      task "$*"
    '';
  };

  todo = name: {
    add = buildSimpleReaktorPlugin "${name}-add" {
      pattern = "^${name}-add: (?P<args>.*)$$";
      script = pkgs.writeDash "${name}-add" ''
        echo "$*" >> ${name}-todo
        echo "added ${name} todo"
      '';
    };
    delete = buildSimpleReaktorPlugin "${name}-delete" {
      pattern = "^${name}-delete: (?P<args>.*)$$";
      script = pkgs.writeDash "${name}-delete" ''
        ${pkgs.gnugrep}/bin/grep -Fvxe "$*" ${name}-todo > ${name}-todo.tmp
        ${pkgs.coreutils}/bin/mv ${name}-todo.tmp ${name}-todo
        echo "removed ${name} todo: $*"
      '';
    };
    show = buildSimpleReaktorPlugin "${name}-show" {
      pattern = "^${name}-show$";
      script = pkgs.writeDash "${name}-show" ''
        ${pkgs.coreutils}/bin/cat ${name}-todo
      '';
    };
  };
}