Issue #3249281 by gisle: Fixed display of README.txt.

* Introduction

* Requirements

* Recommended modules

* Installation

* Configuration

* Maintainers

Drupal site, as well as exposing help to site administrators through the

administrative interface.

* For a full description of the module visit https://www.drupal.org/node/2461741

* For a full description of the module visit

  https://www.drupal.org/project/advanced_help

* To submit bug reports and feature suggestions, or to track changes visit

  https://www.drupal.org/project/issues/advanced_help

REQUIREMENTS

------------

This module has no required dependencies outside of Drupal core.

RECOMMENDED MODULES

-------------------

* Advanced Help Hint (https://www.drupal.org/project/advanced_help_hint):

  If Advanced Help is not enabled, this module will generate a hint string that

  can be used in the project's hook_help to hint that Advanced Help should be

  enabled.

The project's requirements can be found in the project's composer.json.

INSTALLATION

------------

Install the Advanced Help module as you would normally install a contributed

Drupal module. Visit https://www.drupal.org/node/895232 for more information.

You must use composer to install the 8.x-1.x branch of the

project. The exact command line is displayed on the project page,

along with the release.

CONFIGURATION

MAINTAINERS

-----------

* Gisle Hannemyr - https://www.drupal.org/u/gisle

* David Valdez - https://www.drupal.org/u/gnuget

  "name": "drupal/advanced_help",

  "description": "Provide extended help and documentation.",

  "type": "drupal-module",

  "license": "GPL-2.0+",

  "license": "GPL-2.0-or-later",

  "minimum-stability": "dev",

  "authors": [

    {

      "name": "Gisle Hannemyr",

      "homepage": "https://www.drupal.org/u/gisle",

      "role": "Owner"

    },

    {

      "name": "David Valdez (gnuget)",

      "homepage": "https://www.drupal.org/u/gnuget",

    "source": "https://cgit.drupalcode.org/advanced_help"

  },

  "require": {

    "drupal/core": "^8 || ^9",

    "drupal/core": "^8.8 || ^9",

    "michelf/php-markdown": "^1.7"

  }

}

For more extensive example of use of the advanced help features, see

the <strong>Views</strong> project.</p>

<!--

<h2 id="project-recommended">Recommended modules</h2>

<ul>

<li><a href="https://www.drupal.org/project/markdown">Markdown filter</a>:<br>

When this module is enabled, display of any <code>README.md</code> the

module shows will be rendered with markdown.</li>

<li><a href="https://www.drupal.org/project/attributions">Attributions</a>:<br>

When this module is enabled, attributions of third party content used

by the project (i.e. some text from Wikipedia) will be available in an

attribution block and on an attribution page.</li>

</ul>

-->

<h2 id="support-status">Support status</h2>

<p>Reported bugs for the Drupal 7 branch will be fixed in a timely

manner.  Bugs in the issue queue for the Drupal 6 branch will only be

fixed if accompanied with a patch, after the patch has been reviewed

and tested by the community.  No Drupal 8 version is currently under

development.  Post a message in

the <a href="https://www.drupal.org/node/1928218">issue queue</a> if

you're interested in managing a port of the project to to Drupal

8. Older versions are no longer supported.</p>

<p>Reported bugs for all supported versions of the project will be

fixed in a timely manner (provided the bug report describes how to

reproduce the problem at will). Branches compatible with deprecated

versions of Drupal core are not supported.</p>

<p>Community support in the form of patches are very welcome for all

supported versions, and will be given priority. For QA, the project

needs community support in the form of reviews of patches, development

versions and releases.</p>

<p>Community support in the form of patches are very welcome for both

Drupal 6 and Drupal 7 versions, and will be given priority. For QA,

the project needs community support in the form of reviews of patches,

development versions and releases.</p>

<p>The team hopes that the community is willing to help out by

answering &amp; closing support requests.</p>

<p>The primary goal of the module is to remain <strong>light-weight

and simple</strong>.  This means that not all feature requests will be

implemented, even if they are a good idea.  Feature requests

accompanied by patches are more likely to make it into a release.</p>

<p>The maintainer hopes that the community is willing to help out by

answering &amp; closing support requests.</p>

<!--

<h2 id="project-problems">Known problems</h2>

-->

<h2 id="project-maintainers">Credits</h2>

<ul>

<li><a href="https://www.drupal.org/u/redndahead">redndahead</a> (8 commits)</li>

<li><a href="https://www.drupal.org/u/dmitrig01">dmitrig01</a> (3 commits)</li>

<li><a href="https://www.drupal.org/u/amitgoyal">amitgoyal </a> (5 commits)</li>

<li><a href="https://www.drupal.org/u/gisle">gisle</a> (current maintainer, D7)</li>

<li><a href="https://www.drupal.org/u/gisle">gisle</a> (current maintainer, D7, D9)</li>

<li><a href="https://www.drupal.org/u/gnuget">gnuget</a> (current maintainer, D8)</li>

</ul>

  }

  /**

   *

   * Load and render an README.md or README.txt help topic.

   */

  public function topicPage(Request $request, $module, $topic) {

    $is_modal = ($request->query->get(MainContentViewSubscriber::WRAPPER_FORMAT) === 'drupal_modal');

      $build['#markup'] = $this->t('Missing help topic.');

    }

    $build['#attached']['library'][] = 'advanced_help/help';

    $topicfile =$request->attributes->get('topic');

    $txt = strpos($topicfile, 'txt');

    if ($txt) {

      $build['#markup'] = '<pre>' .$build['#markup'] . '</pre>';

    }

    return $build;

  }

  /**

   * Load and render a help topic.

   * Load and render an Advanced Help help topic.

   *

   * @param string $module

   *   Name of the module.