mortalis

The plugin adds HTML editor to the default post editor. The editor is accessible through a new HTML tab. When opening the tab the editor loads the raw HTML source of the post, formats it and applies Ace Editor to the input area. So the edit area has main features from this web editor: syntax highlight, line numbers, highlight of matching tags and brackets, keyboard shortcuts.
The plugin is based on the <a href="https://wordpress.org/plugins/ace-editor-for-wp/" rel="ugc">ACE Editor for WP</a> plugin. It’s updated for WordPress 4.1 and Ace editor 1.1.8.
<h4>Features</h4>
<ul>
<li>Syntax highlighting</li>
<li>Line numbers</li>
<li>Line highlighting</li>
<li>Highlight of matching tags and brackets</li>
<li>Syntax checking</li>
<li>Multicursor</li>
<li>Ace Editor keyboard shortcuts</li>
<li>Search box</li>
<li>Resizable area</li>
<li>Emmet HTML snippets</li>
<li>Full screen mode</li>
<li>Toggle word wrap option</li>
<li>Custom shortcuts</li>
<li>Options page</li>
</ul>
<h4>Usage</h4>
<ol>
<li>Before switching to the HTML tab first make sure you are on the Visual tab because the script loads the data from the TinyMCE editor which is loaded only when the Visual tab activates. </li>
<li>When you are on the Text tab the HTML tab is disabled and has a light red background so you won’t be able to switch to it until you activate the Visual tab. </li>
<li>When the HTML tab is activated the Text tab becomes disabled so you may only switch to the Visual tab. This is done to prevent the conflicts of content which is loaded when appropriate tab is activated.</li>
<li>If you edit some content in the HTML mode and want to save it and update the post first switch to the Visual tab so the edited HTML code loads to the TinyMCE editor. It’s required because the content synchronization is performed only after switching off the HTML tab.</li>
</ol>
<h4>Working with features</h4>
<ol>
<li>Multicursor lets you edit multiple regions at the same time. You can use default shortcuts to add remove regions or select multiple blocks with mouse holding Ctrl key.</li>
<li>Default keyboard shortcuts for the Ace editor can be found on the <a href="https://github.com/ajaxorg/ace/wiki/Default-Keyboard-Shortcuts" rel="nofollow ugc">Ace GitHub Wiki</a> page or on the <a href="http://pcadvice.co.nf/blog/ace-editor-shortcuts/" rel="nofollow ugc">Ace Editor Shortcuts</a> page I created for the WordPress version of this editor. Here I selected some shortcuts and organized them by categories.</li>
<li>The Search box gives additional functions:
<ul>
<li>Search All instances</li>
<li>Use of Regular expressions</li>
<li>Whole word search</li>
<li>Replace content</li>
<li>Replace All 
It shows with Ctrl+F and Ctrl+H combinations.</li>
</ul>
</li>
<li>The editor area can be resized using the bottom (southern) handle but it doesn’t remember its size after switching.</li>
<li>Emmet snippets are used to improve code typing. The documentation:
<ul>
<li><a href="http://docs.emmet.io/abbreviations/" rel="nofollow ugc">Basic Usage</a></li>
<li><a href="http://docs.emmet.io/cheat-sheet" rel="nofollow ugc">Full list</a> of HTML and CSS snippets</li>
</ul>
</li>
<li>Full screen mode is not a default Ace Editor feature. I’ve taken the idea from a demo page in the <a href="https://github.com/ajaxorg/ace-builds/tree/master/demo" rel="nofollow ugc">Ace build package</a>. The page is named scrollable-page.html. 
It adds a new custom shortcut to the editor which toggles the full/normal mode. So I set this function to the F11 key. 
The function extends the editor container to the Wordpess admin boundaries but doesn’t hide top and left menus. It also works if the window size is changed or the left menu is collapsed. But to fill the available space in these cases the F11 key must be pressed two times when the editor is in the full screen mode. 
If you need to change this F11 key to other write me a request and I’ll add an option to the options page.</li>
<li>The Word Wrap checkbox appears when the HTML tab is switched to. By default the editor has word wrapping enabled. You can toggle this option with the checkbox. But it only remembers its state in the current editor session.</li>
<li>I’ve also added some custom shortcuts:
<ul>
<li>Ctrl+Enter adds a new line below the current one regardless of what is the current position the cursor on the current line</li>
<li>Ctrl+R switches to the Visual tab</li>
</ul>
</li>
</ol>
<h4>The Options Page</h4>
<ol>
<li>Font size of the editor may be set in any CSS units (px, pt, em).</li>
<li>Editor themes dropdown shows default Ace Editor theme list plus my custom theme Sublime which is the default theme for the plugin.</li>
<li>The options form is submitted using Ajax so the page doesn’t reload, just wait until the save button is enabled and the success message appears at the top. Then reload the edit post page to see the editor changes.</li>
</ol>
<h4>Other Notes</h4>
<ol>
<li>Emmet plugin works on the specially built package for the Ace Editor. Its source is <a href="https://github.com/cloud9ide/emmet-core" rel="nofollow ugc">here</a>. And I reduced its size by removing the Underscore.js part and CSS snippets. So the final package is <a href="https://github.com/mortalis13/emmet-for-ace-css" rel="nofollow ugc">here</a>.</li>
<li>When the HTML tab is loaded the source code is first represented as one long line. So I used the <a href="https://github.com/beautify-web/js-beautify/tree/master/js" rel="nofollow ugc">JS Beautifier</a> tool and exactly its beautify-html.js subscript to format that line so it has some readable structure. Additionally I applied my own function to have some blank lines before <code><hx></code>, <code></code> and <code><pre></code> tags.</li>
<li>I’ve put only the minified version of the Ace Editor scripts to the plugin package. To get the full uncompressed files go to its <a href="https://github.com/ajaxorg/ace-builds" rel="nofollow ugc">GitHub repository</a>.</li>
</ol>
<h4>Resource Links</h4>
<ol>
<li><a href="http://ace.c9.io" rel="nofollow ugc">Ace Editor Main Site</a> and <a href="https://github.com/ajaxorg/ace" rel="nofollow ugc">GitHub repository</a>.</li>
<li><a href="https://github.com/ajaxorg/ace-builds" rel="nofollow ugc">Ace Builds GitHub repository</a> with sources.</li>
<li><a href="https://github.com/ajaxorg/ace-builds/tree/master/demo" rel="nofollow ugc">Ace Editor Demo Pages</a>.</li>
<li><a href="https://github.com/ajaxorg/ace/wiki/Default-Keyboard-Shortcuts" rel="nofollow ugc">Ace Editor Keyboard Shortcuts</a> and <a href="http://pcadvice.co.nf/blog/ace-editor-shortcuts" rel="nofollow ugc">my edition</a>.</li>
<li>Emmet plugin: <a href="http://emmet.io" rel="nofollow ugc">Main Site</a>, <a href="http://docs.emmet.io" rel="nofollow ugc">Documentation</a>, <a href="http://docs.emmet.io/cheat-sheet" rel="nofollow ugc">List of Abbreviations</a>.</li>
<li><a href="https://github.com/mortalis13/emmet-for-ace-css" rel="nofollow ugc">Special Emmet package</a> for the Ace Editor.</li>
<li><a href="https://github.com/beautify-web/js-beautify/tree/master/js" rel="nofollow ugc">JS Beautifier</a>.</li>
</ol>
This plugin’s GitHub repository: https://github.com/mortalis13/html-post-editor.
<h4>Detected Problems</h4>
<ul>
<li>When switching to the full-screen mode (F11) and the “Enable full-height editor and distraction-free functionality” Screen option is enabled the post tabbar stays on the front.</li>
<li>If cursor doesn’t match its established position (e.g., should be in the line end after the last character but displays with offset to the left) try installing Consolas fonts to the Fonts folder (this problem detected in Windows XP where no Consolas fonts installed by default). Install all 4 types of Consolas (Regular, Bold, Italic, Bold Italic). I’ve taken them from Windows 7 Fonts folder.</li>
</ul>

HTML Post Editor

Adds HTML tab to the post editor which shows the raw source of the page and is highlighted with the Ace Editor

willdelphia

Registers a raw html block which uses the ACE Editor. Features include syntax highligting, line numbers, indentation, and HTML validation.
Any HTML markup included in your block will be interpreted and rendered on your user-facing page or post just like the core “Custom HTML” block. This plugin is not for embedding pretty markup on your front-end site, rather it is for those developers that need to include raw HTML in their pages or posts and want to improve the readability of their HTML snippets and have a better in-browser code editing experience.
<h3>To Use:</h3>
Create a new block in the editor and look for “ACE HTML Block” in the Formatting section. It has a heart icon.
<h3>Note on block transforms:</h3>
There (hopefully) may come a time in the future when WordPress introduces native syntax highlighting on core “Custom HTML” blocks. This block is configured to transform to (and from) the core HTML block so the transition away from this plugin will be easy if you ever want to disable it. To transform this block click on the heart icon in the upper left corner of the block and select “Custom HTML” from the dropdown menu.
<h3>Thanks:</h3>
Under the hood it uses <a href="https://github.com/securingsincity/react-ace" rel="nofollow ugc">react-ace</a>.

ACE HTML Block

Registers a raw html block which uses the ACE Editor. Features include syntax highligting, line numbers, indentation, and HTML validation.

HTML Post Editor vs ACE HTML Block