Dmytro Shteflyuk

CodeColorer lets you insert syntax-highlighted code snippets into posts, comments, and feeds.
CodeColorer currently bundles GeSHi 1.0.9.0 from the upstream 1.0.x line, with a small set of project-local maintenance patches for current PHP and WordPress compatibility.
Plugin based on GeSHi library, which supports most languages. CodeColorer has various nice features:
<ul>
<li>syntax highlighting in RSS feeds</li>
<li>syntax highlighting of a single line of code (inline)</li>
<li>syntax highlighting of code in comments</li>
<li>line numbers</li>
<li>automatic links to the documentation inserting</li>
<li>code block intelligent scroll detection (short code would have a short block, for a long one the block height would be fixed and a scrollbar would appear)</li>
<li>predefined color themes (Slush & Poppies, Blackboard, Dawn, Mac Classic, Twitlight, Vibrant Ink, Railscasts, Solarized Light, Solarized Dark)</li>
<li>syntax colors customization in CSS file</li>
<li>code protect from mangling by WordPress (for example, quotes, double-dashes, and others would look just right as you entered)</li>
</ul>
<h4>Support</h4>
If you have any suggestions, found a bug, wanted to contribute a translation to your language, or just wanted to say “thank you”, feel free to email me <a href="mailto:kpumuk@kpumuk.info" rel="nofollow ugc">kpumuk@kpumuk.info</a>. I will try my best to answer you.
If you want to contribute your code, see the Development section under the Other Notes tab.
<h3>Supported languages</h3>
Here is the list of languages supported by CodeColorer: 4cs, 6502acme, 6502kickass, 6502tasm, 68000devpac, abap, actionscript, actionscript3, ada, aimms, algol68, apache, applescript, apt_sources, arm, asm, asp, asymptote, autoconf, autohotkey, autoit, avisynth, awk, bascomavr, bash, basic4gl, batch, bf, biblatex, bibtex, blitzbasic, bnf, boo, c, c_loadrunner, c_mac, c_winapi, caddcl, cadlisp, ceylon, cfdg, cfm, chaiscript, chapel, cil, clojure, cmake, cobol, coffeescript, cpp-qt, cpp-winapi, cpp, csharp, css, cuesheet, d, dart, dcl, dcpu16, dcs, delphi, diff, div, dos, dot, e, ecmascript, eiffel, email, epc, erlang, euphoria, ezt, f1, falcon, fo, fortran, freebasic, freeswitch, fsharp, gambas, gdb, genero, genie, gettext, glsl, gml, gnuplot, go, groovy, gwbasic, haskell, haxe, hicest, hq9plus, html4strict, icon, idl, ini, inno, intercal, io, ispfpanel, j, java, java5, javascript, jcl, jquery, julia, kixtart, klonec, klonecpp, kotlin, latex, lb, ldif, lisp, llvm, locobasic, logtalk, lolcode, lotusformulas, lotusscript, lscript, lsl2, lua, m68k, magiksf, make, mapbasic, mathematica, matlab, mercury, metapost, mirc, mk-61, mmix, modula2, modula3, mpasm, mxml, mysql, nagios, netrexx, newlisp, nginx, nimrod, nsis, oberon2, objc, objeck, ocaml-brief, ocaml, octave, oobas, oorexx, oracle11, oracle8, oxygene, oz, parasail, parigp, pascal, pcre, per, perl, perl6, pf, phix, php-brief, php, pic16, pike, pixelbender, pli, plsql, postgresql, postscript, povray, powerbuilder, powershell, proftpd, progress, prolog, properties, providex, purebasic, pycon, pys60, python, q, qbasic, qml, racket, rails, rbs, rebol, reg, rexx, robots, rpmspec, rsplus, ruby, rust, sas, sass, scala, scheme, scilab, scl, sdlbasic, smalltalk, smarty, spark, sparql, sql, standardml, stonescript, swift, systemverilog, tcl, tclegg, teraterm, texgraph, text, thinbasic, tsql, twig, typoscript, unicon, upc, urbi, uscript, vala, vb, vbnet, vbscript, vedit, verilog, vhdl, vim, visualfoxpro, visualprolog, whitespace, whois, winbatch, xbasic, xml, xojo, xorg_conf, xpp, xyscript, yaml, z80, zxbasic.
<h3>Development</h3>
Sources of this plugin are available both in SVN and Git:
<ul>
<li><a href="https://plugins.svn.wordpress.org/codecolorer/" rel="nofollow ugc">WordPress SVN repository</a></li>
<li><a href="https://github.com/kpumuk/codecolorer/" rel="nofollow ugc">GitHub</a></li>
</ul>
The GitHub repository includes local contributor tooling based on <code>mise</code>, Composer, <code>pnpm</code>, and <code>wp-env</code>. A typical setup is:
<ol>
<li><code>mise install</code></li>
<li><code>mise run bootstrap</code></li>
<li><code>mise run test</code></li>
<li><code>mise run wp-start</code></li>
</ol>
Feel free to check them out, make your changes and send me patches or pull requests. Promise, I will apply every patch (of course, if they add a value to the product). Email for patches, suggestions, or bug reports: <a href="mailto:kpumuk@kpumuk.info" rel="nofollow ugc">kpumuk@kpumuk.info</a>.
If you’re interested in translating CodeColorer to your language, please check out the <a href="https://translate.wordpress.org/projects/wp-plugins/codecolorer" rel="nofollow ugc">translation page</a> for the plugin.
<h3>Customization</h3>
Syntax coloring is highly customizable: you could change the color scheme for all languages or a specific language. You could find CodeColorer CSS in wp-content/plugins/codecolorer/codecolorer.css file. To change colors for all languages edit lines below Color scheme section.
There is a simple mapping between TextMate color themes and CodeColorer ones:
<pre><code>/* "Slush & Poppies" color scheme (default) */
.codecolorer-container, .codecolorer { color: #000000; background-color: #F1F1F1; }
/* Comment */
.codecolorer .co0, .codecolorer .co1, .codecolorer .co2, .codecolorer .co3, .codecolorer .co4, .codecolorer .coMULTI { color: #406040; font-style: italic; }
/* Constant */
.codecolorer .nu0, .codecolorer .re3 { color: #0080A0; }
/* String */
.codecolorer .st0, .codecolorer .st_h, .codecolorer .es0, .codecolorer .es1 { color: #C03030; }
/* Entity */
.codecolorer .me1, .codecolorer .me2 { color: #0080FF; }
/* Keyword */
.codecolorer .kw1, .codecolorer .kw2, .codecolorer .sy1 { color: #2060A0; }
/* Storage */
.codecolorer .kw3, .codecolorer .kw4, .codecolorer .kw5, .codecolorer .re2 { color: #008080; }
/* Variable */
.codecolorer .re0, .codecolorer .re1 { color: #A08000; }
/* Global color */
.codecolorer .br0, .codecolorer .sy0 { color: #000000; }
</code></pre>
Check the codecolorer.css file to get more examples.

CodeColorer

Syntax highlighting for code snippets in posts, comments, and RSS, with inline code, themes, and line numbers.

Jan-Philip Gehrcke

• <a href="https://gehrcke.de/wp-geshi-highlight-demo/" rel="nofollow ugc">Live demo</a>
• Highlights:
<ul>
<li>Supports <a href="https://github.com/GeSHi/geshi-1.0/tree/v1.0.9.1/src/geshi" rel="nofollow ugc">259 languages</a>.</li>
<li>Server-side. Saves bandwidth, latency, and battery compared to client-side rendering.</li>
<li>Near-zero load on the backend. With a caching solution this does not affect your page load time at all.</li>
<li>Line numbering. If you want to (no vertical displacements between code line and line number).</li>
<li>Default style was tested with more than 20 themes, including Twenty Ten to Fifteen, and tweaked based on a bunch of user feedback.</li>
<li>If you’d like to tweak the style: just provide your own CSS file. Styles are highly & easily configurable.</li>
<li>Per-block styles: each code block on a single page can be styled on its own (if that is something you would liked to do).</li>
<li>Clean, small and valid HTML output.</li>
<li>Well-documented source code using modern WordPress API calls.</li>
<li>I have maintained this plugin for several years and I plan to continue to provide support.</li>
<li>Based on <a href="http://qbnz.com/highlighter/" rel="nofollow ugc">GeSHi</a>, a reliable and well-established PHP highlighting engine, used by popular community forum applications such as phpBB or wiki applications such as Dokuwiki or MediaWiki.</li>
</ul>
WP-GeSHi-Highlight works as a drop-in replacement for <a href="https://wordpress.org/extend/plugins/wp-syntax/" rel="ugc">WP-Syntax</a>, which does not seem to be maintained anymore (as of 2015). Make the switch, it should just work (let me know how it went)!
• Usage:
WordPress 5 users: for now I have tested this plugin only with the <a href="https://wordpress.org/plugins/classic-editor/" rel="ugc">Classical Editor</a>. Gutenberg is not yet supported (it may work though, let me know).
Recommendation: use the “Text” (raw) editor. Do not use the “Visual” editor. Switching between both may corrupt the contents of your code blocks.
In the text editor insert code blocks as <code>pre</code> blocks, and use the <code>lang</code> argument to define the language of the code snippet:
<pre><code><pre lang="language">
 CODE
</pre>
</code></pre>
A short example for the <code>bash</code> language:
<pre><code><pre lang="bash">
 $ dd if=/dev/zero of=image.ext3 bs=1M count=10000 oflag=append conv=notrunc
</pre>
</code></pre>
Publish/preview, and have a look at the result!
Also check out the reference documentation for all available options. You can find it on the <a href="https://gehrcke.de/wp-geshi-highlight" rel="nofollow ugc">plugin’s website</a>. Note that more usage examples can be found on the <a href="https://gehrcke.de/wp-geshi-highlight-demo/" rel="nofollow ugc">demo website</a>.
• Issues:
A bunch of websites have used this plugin for years, and it seems to serve its purpose well. If you find an issue please let me know: drop a <a href="mailto:jgehrcke@googlemail.com" rel="nofollow ugc">mail</a> or leave a <a href="http://gehrcke.de/wp-geshi-highlight" rel="nofollow ugc">comment</a>.
• Theme compatibility of the default style sheet:
The default style sheet was tested with recent versions of all official themes (Twenty Ten to Twenty Fifteen), and with a large range of non-official themes such as Vantage, Customizr, ColorWay, Zerif Lite, Responsive, Storefront, Virtue, evolve, Make, Sparkling, Spacious, Enigma, Sydney, Point, Interface, SinglePage.
Certain themes might define styles with a high specificity that negatively affect the visual code block appearance. It is difficult to impossible to anticipate all these cases in advance, so I expect this to happen in rare cases (the past has proven that these things happen). So, I need you to look out for these situations, and please report them!

WP-GeSHi-Highlight — rock-solid syntax highlighting for 259 languages

Simple. Fast. 259 languages. Mobile-friendly. Rock-solid (GeSHi).

CodeColorer vs WP-GeSHi-Highlight — rock-solid syntax highlighting for 259 languages