text: var words = {};
  function define(style, dict) {
    for(var i = 0; i < dict.length; i++) {
      words[dict[i]] = style;
    }
  };
  
  var commonAtoms = ["true", "false"];
  var commonKeywords = ["if", "then", "do", "else", "elif", "while", "until", "for", "in", "esac", "fi",
                        "fin", "fil", "done", "exit", "set", "unset", "export", "function"];
  var commonCommands = ["ab", "awk", "bash", "beep", "cat", "cc", "cd", "chown", "chmod", "chroot", "clear",
                        "cp", "curl", "cut", "diff", "echo", "find", "gawk", "gcc", "get", "git", "grep", "hg", "kill", "killall",
                        "ln", "ls", "make", "mkdir", "openssl", "mv", "nc", "nl", "node", "npm", "ping", "ps", "restart", "rm",
                        "rmdir", "sed", "service", "sh", "shopt", "shred", "source", "sort", "sleep", "ssh", "start", "stop",
                        "su", "sudo", "svn", "tee", "telnet", "top", "touch", "vi", "vim", "wall", "wc", "wget", "who", "write",
                        "yes", "zsh"];
  
  define('atom', commonAtoms);
  define('keyword', commonKeywords);
  define('builtin', commonCommands);
  
  function tokenBase(stream, state) {
    if (stream.eatSpace()) return null;
  
    var sol = stream.sol();
    var ch = stream.next();
  
    if (ch === '\\') {
      stream.next();
      return null;
    }
    if (ch === '\'' || ch === '"' || ch === '`') {
      state.tokens.unshift(tokenString(ch, ch === "`" ? "quote" : "string"));
      return tokenize(stream, state);
    }
    if (ch === '#') {
      if (sol && stream.eat('!')) {
        stream.skipToEnd();
        return 'meta'; // 'comment'?
      }
      stream.skipToEnd();
      return 'comment';
    }
    if (ch === '$') {
      state.tokens.unshift(tokenDollar);
      return tokenize(stream, state);
    }
    if (ch === '+' || ch === '=') {
      return 'operator';
    }
    if (ch === '-') {
      stream.eat('-');
      stream.eatWhile(/\w/);
      return 'attribute';
    }
    if (ch == "<") {
      if (stream.match("<<")) return "operator"
      var heredoc = stream.match(/^<-?\s*['"]?([^'"]*)['"]?/)
      if (heredoc) {
        state.tokens.unshift(tokenHeredoc(heredoc[1]))
        return 'string.special'
      }
    }
    if (/\d/.test(ch)) {
      stream.eatWhile(/\d/);
      if(stream.eol() || !/\w/.test(stream.peek())) {
        return 'number';
      }
    }
    stream.eatWhile(/[\w-]/);
    var cur = stream.current();
    if (stream.peek() === '=' && /\w+/.test(cur)) return 'def';
    return words.hasOwnProperty(cur) ? words[cur] : null;
  }
  
  function tokenString(quote, style) {
    var close = quote == "(" ? ")" : quote == "{" ? "}" : quote
    return function(stream, state) {
      var next, escaped = false;
      while ((next = stream.next()) != null) {
        if (next === close && !escaped) {
          state.tokens.shift();
          break;
        } else if (next === '$' && !escaped && quote !== "'" && stream.peek() != close) {
          escaped = true;
          stream.backUp(1);
          state.tokens.unshift(tokenDollar);
          break;
        } else if (!escaped && quote !== close && next === quote) {
          state.tokens.unshift(tokenString(quote, style))
          return tokenize(stream, state)
        } else if (!escaped && /['"]/.test(next) && !/['"]/.test(quote)) {
          state.tokens.unshift(tokenStringStart(next, "string"));
          stream.backUp(1);
          break;
        }
        escaped = !escaped && next === '\\';
      }
      return style;
    };
  };
  
  function tokenStringStart(quote, style) {
    return function(stream, state) {
      state.tokens[0] = tokenString(quote, style)
      stream.next()
      return tokenize(stream, state)
    }
  }
  
  var tokenDollar = function(stream, state) {
    if (state.tokens.length > 1) stream.eat('$');
    var ch = stream.next()
    if (/['"({]/.test(ch)) {
      state.tokens[0] = tokenString(ch, ch == "(" ? "quote" : ch == "{" ? "def" : "string");
      return tokenize(stream, state);
    }
    if (!/\d/.test(ch)) stream.eatWhile(/\w/);
    state.tokens.shift();
    return 'def';
  };
  
  function tokenHeredoc(delim) {
    return function(stream, state) {
      if (stream.sol() && stream.string == delim) state.tokens.shift()
      stream.skipToEnd()
      return "string.special"
    }
  }
  
  function tokenize(stream, state) {
    return (state.tokens[0] || tokenBase) (stream, state);
  };
  
  export const shell = {
    startState: function() {return {tokens:[]};},
    token: function(stream, state) {
      return tokenize(stream, state);
    },
    languageData: {
      autocomplete: commonAtoms.concat(commonKeywords, commonCommands),
      closeBrackets: {brackets: ["(", "[", "{", "'", '"', "`"]},
      commentTokens: {line: "#"}
    }
  };
  