For editing plugin or theme source code files, WordPress natively uses a bland ol' textarea.
The 'Developer Code Editor' plugin uses the advanced CodeMirror JS-based code editor to stylize that textarea and add several improvements to it.
These improvements include syntax highlighting and line numbers, for easily finding code sections and syntax errors.
Installation:
Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.
Requirements:
· WordPress 2.9 or higher
What's New in This Release: [ read full changelog ]
· Fixed more minor bugs.