(function (Prism) {
  // CAREFUL!
  // The following patterns are concatenated, so the group referenced by a back reference is non-obvious!

  var strings = [
    // normal string
    /"(?:\\[\s\S]|\$\([^)]+\)|\$(?!\()|`[^`]+`|[^"\\`$])*"/.source,
    /'[^']*'/.source,
    /\$'(?:[^'\\]|\\[\s\S])*'/.source,

    // here doc
    // 2 capturing groups
    /<<-?\s*(["']?)(\w+)\1\s[\s\S]*?[\r\n]\2/.source,
  ].join('|');

  Prism.languages['shell-session'] = {
    command: {
      pattern: RegExp(
        // user info
        /^/.source +
          '(?:' +
          // <user> ":" ( <path> )?
          (/[^\s@:$#%*!/\\]+@[^\r\n@:$#%*!/\\]+(?::[^\0-\x1F$#%*?"<>:;|]+)?/
            .source +
            '|' +
            // <path>
            // Since the path pattern is quite general, we will require it to start with a special character to
            // prevent false positives.
            /[/~.][^\0-\x1F$#%*?"<>@:;|]*/.source) +
          ')?' +
          // shell symbol
          /[$#%](?=\s)/.source +
          // bash command
          /(?:[^\\\r\n \t'"<$]|[ \t](?:(?!#)|#.*$)|\\(?:[^\r]|\r\n?)|\$(?!')|<(?!<)|<<str>>)+/.source.replace(
            /<<str>>/g,
            function () {
              return strings;
            }
          ),
        'm'
      ),
      greedy: true,
      inside: {
        info: {
          // foo@bar:~/files$ exit
          // foo@bar$ exit
          // ~/files$ exit
          pattern: /^[^#$%]+/,
          alias: 'punctuation',
          inside: {
            user: /^[^\s@:$#%*!/\\]+@[^\r\n@:$#%*!/\\]+/,
            punctuation: /:/,
            path: /[\s\S]+/,
          },
        },
        bash: {
          pattern: /(^[$#%]\s*)\S[\s\S]*/,
          lookbehind: true,
          alias: 'language-bash',
          inside: Prism.languages.bash,
        },
        'shell-symbol': {
          pattern: /^[$#%]/,
          alias: 'important',
        },
      },
    },
    output: /.(?:.*(?:[\r\n]|.$))*/,
  };

  Prism.languages['sh-session'] = Prism.languages['shellsession'] =
    Prism.languages['shell-session'];
})(Prism);