PreviewCode 1.2.5

PreviewCode provides macOS QuickLook file previews and Finder icon thumbnails for more than 50 programming and scripting languages, header files, and data files.

It is not exhaustive, nor is it intended to be. It is, however, intended to support the most popular languages used by Mac-based developers, whether for use on a Mac or on other platforms.

Installation and Usage

Just run the host app once to register the extensions — you can quit the app as soon as it has launched. We recommend logging out of your Mac and back in again at this point. Now you can preview source code files using QuickLook (select an icon and hit Space), and Finder’s preview pane and Info panels.

You can disable and re-enable the Code Previewer and Code Thumbnailer extensions at any time in System Preferences > Extensions > Quick Look.

Adjusting the Preview

Open the main app and click on Show Preview Preferences, or select Preferences... from the PreviewCode menu.

You can select from a range of text sizes, choose a monospace font, select the font’s style — regular, bold, italic, etc. — and pick which theme you would like previews to use. One hundred themes are included, and you can view all of them, or just dark or light ones.

PreviewCode will use your selected theme whether your Mac is set to light or dark mode. It will not adapt according to your system setting, but we may add support for this in a future release.

Languages

Compiled Languages

• ActionScript (.actionscript)
• Ada (.ads, .adb)
• AppleScript (.applescript)
• Arduino (.arduino, .ino)
• Basic (.basic, .bas)
• Brainfuck (.brainfuck, .b, .bf)
• C (.c, .h)
• C++ (.cpp, .hpp)
• C# (.csx, .cs, .c-sharp)
• Clojure (.clojure, .clj, .cljc, .cljs)
• CoffeeScript (.coffee, .coffeescript, .litcoffee)
• Dart (.dart)
• Elixir (.elxir, .ex, .exs)
• Erlang (.erlang, .erl, .hrl)
• Fortran (.for)
• F# (.f-sharp, .fsi, .fsx, .fsscript)
• Go (.go)
• Haskell (.haskell, .hs, .lhs)
• Java (.java)
• JavaScript (.js)
• Julia (.julia, .jl)
• Kotlin (.kotlin, .kt, .ktm, .kts)
• Lisp (.lisp, .lsp, .fasl)
• Lua (.lua)
• Objective-C (.m)
• Pascal (.pas)
• Perl (.perl)
• PHP (.php)
• Python (.py)
• Ruby (.rb)
• Rust (.rs, .rust)
• Swift (.swift)
• TypeScript (.typescript, .tsx)
• Visual Basic Script (.vbscript, .vbe, .vbs, .wsc, .wsf)

Shell Scripting

• Bash (.sh)
• C Shell (.csh)
• Korn Shell (.ksh)
• TCSH (.tsch)
• Z Shell (.zsh)

Assembly

• ARM Assembler (.s)
• x86-64 Assembler (.asm, .nasm)

Others

• AsciiDoc (.asciidoc, .adoc, .asc)
• Config files (.conf, .cf, .cfg, .ini, .rc)
• Cmake files (.cmake)
• CSS (.css)
• Enviroment (.env)
• LaTex (.latex, .tex)
• Makefiles (makefile)
• Misc. files (.in, .out)
• Apple Property list files (.plist)
• Protobuf (.proto)
• SASS/SCSS (.scss, .sass)
• SQL script (.sql)
• Terraform source file (.tf, .terraform)
• Terraform variable file (.tfvars)
• Twig (.twig)

Known Issues

• 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.
• PreviewCode will not render Clojure .edn files. This is because the .edn file extension is pre-set on macOS to an Adobe digital rights management product. We are investigating possible workarounds.
• PreviewCode will not render TypeScript .ts files. This is because the .ts file extension is a standard for transport stream video files. Workaround: use .tsx for TypeScript files.

Source Code

This repository contains the primary source code for PreviewCode. Certain graphical assets and data files are not included. To build PreviewCode from scratch, you will need to add these files yourself or remove them from your fork.

Acknowledgements

PreviewCode makes use of HighlighterSwift which provides a Swift wrapper for Highlight.js and is derived from Highlightr.

Release Notes

• 1.2.5 21 January 2023
  • Add link to PreviewText.
  • Better menu handling when panels are visible.
  • Better app exit management.
• 1.2.4 14 December 2022
  • Add com.microsoft.c-sharp UTI.
  • Support makefiles.
• 1.2.3 2 October 2022
  • Add link to PreviewJson.
• 1.2.2 26 August 2022
  • Add public.lua-script UTI.
  • Support XML .plist files.
  • Initial support for non-utf8 source code file encodings.
• 1.2.1 7 August 2022
  • Support the .cs C# extension.
  • Fix ARM assembly file display.
  • Fix operation of Preferences’ font style popup.
• 1.2.0 26 April 2022
  • Update to use HighlighterSwift 1.1.0.
  • Support environment .env files.
  • Support CMake .cmake files.
  • Support Terraform variable .tfvars files.
  • Support AsciiDoc .adoc, .asciidoc and .asc files.
  • Support .conf, .cf, .cfg, .ini and .rc config files
  • Fix Haskell .hsl extension.
  • Fix x86 .nasm preview.
  • Change ActionScript supported extension to .actionscript to avoid clash with AppleSingle .as.
  • Remove Lisp .cl — clash with OpenCL source.
  • Remove Lisp .l — clash with Lex source.
  • Remove F# .fs — clash with OpenGL Fragment Shader source.
  • Remove Dylan .dylan and .lid extensions.
• 1.1.1 19 November 2021
  • Support HashiCorp Terraform .tf files.
  • Disable file-type thumbnail tags under macOS 12 Monterey to avoid clash with system-added tags.
• 1.1.0 28 July 2021
  • Improved font selection code.
  • Separate font style selection.
  • Accelerate loading of the Preferences panel, especially on Intel Macs.
  • Code streamlining.
  • Fixed a rare bug in the previewer error reporting code.
  • Apple wants links to other apps to be App Store links. So be it. What Apple wants, Apple gets.
• 1.0.0 16 June 2021
  • Initial public release.

Copyright and Credits

Primary app code and UI design © 2023, Tony Smith.

Code portions © 2016 Juan Pablo Illanes.
Code portions © 2006-22 Ivan Sagalaev.