Textastic

Textastic is a simple and fast text, code, and markup editor. With support for more than 80 source code and markup languages, it brings the powerful syntax coloring engine of the popular iOS code editor to the Mac:

• Syntax highlighting for more than 80 languages
• Compatible with TextMate syntax definitions and themes
• Code completion for HTML, CSS, JavaScript, PHP, C, and Objective-C
• Open files in tabs
• Open folders in a sidebar
• Find in files
• Print files
• Symbol list to quickly navigate in a file
• Emmet support built-in
• Auto Save and Versions
• iCloud document sync (OS X 10.8 Mountain Lion only)
• Ready for Retina displays

Note: You can use Textastic for iPad and iPhone to sync files between the Mac and iOS versions of Textastic using iCloud.

• Added full support for Dark Mode on macOS Mojave and improved the user interface.
• New syntax highlighter: Textastic 4 has a completely new syntax highlighter that can use Sublime Text 3 syntax definitions (in addition to language grammars from TextMate 1). This means much better support for modern features in almost all supported programming and markup languages
• Added syntax definitions for TypeScript, Rust, and reStructuredText. Updated syntax definitions for almost all other supported languages