PreviewCode

PreviewCode provides QuickLook file previews and Finder file icon thumbnails for source code documents and data files for a wide variety of programming languages.

The app provides two app extensions: Code Previewer and Code Thumbnailer, which can be viewed and managed in macOS’ System Preferences > Extensions. The app itself is a container for these extensions.

You must run the app first to gain these benefits.

PreviewCode supports the following languages features:

• ActionScript

• Ada

• AppleScript

• Arduino

• Basic

• Brainfuck

• C

• C++

• C#

• Clojure

• CoffeeScript

• Dart

• Elixir

• Elm

• Erlang

• Fortran

• F#

• GML

• Go

• Haskell

• Java

• JavaScript

• Julia

• Kotlin

• Lisp

• Lua

• Objective-C

• Pascal

• Perl

• PHP

• Python

• Ruby

• Rust

• Swift

• TypeScript

• Visual Basic Script

• Vue.js

Shell Scripting

• Bash

• C Shell

• Korn Shell

• TCSH

• Z Shell

Assembly

• ARM Assembler

• x86-64 Assembler

Others

• CSS

• LaTex

• Protobuf

• SASS/SCSS

• SQL script

• Twig

• Terraform source and vars files

• .cmake files

• .env files

• Config files

• Asciidoc

• Xcode files (.storyboard, .xib, .plist)

Known Issues

• PreviewCode will not render Clojure .edn files: the .edn file extension is pre-set on macOS to an Adobe digital rights management product.

• PreviewCode will not render TypeScript .ts files: the .ts file extension is pre-set on macOS to MPEG-2 transport stream video files. The .tsx and .typescript extensions are supported.

• PreviewCode will not render Elixir .exs files if GarageBand and/or Logic Pro is installed on your Mac. This is because these apps use this file extension for EXS24 instrument files.

- Previews displayed on external displays, or on Macs with connected to multiple monitors, may intermittently not be scrollable if you’re using a third-party mouse. Workaround: a MacBook’s built-in trackpad will be able to scroll.

- Deselecting code in the preview is not immediate: the highlight clears after ~1s. We are investigating fixes.