Original project: http://code.google.com/p/qlcolorcode/
Github repository: https://github.com/anthonygelibert/QLColorCode

This code is tested on macOS Mojave(10.14.5, xcode 12.1) only. Because the purpose of this branch is to resolve weird icon thumbnail issue in macOS Mojave.

• Resolve weird thumbnail icon appearance in macOS Mojave

  Code for generating preview and thumbnail presentation part, I borrowed it from below repositories.
  QLSwift https://github.com/lexrus/QLSwift.git
  QLStephen https://github.com/whomwah/qlstephen.git

• Support Mojave Dark mode

  Setting the thumbnail color style when system dark mode is on (default is darkplus):

    defaults write org.n8gray.QLColorCode darkTheme darkplus
  

  Setting the thumbnail color style when system darkmode is off (default is edit-xcode):

    defaults write org.n8gray.QLColorCode lightTheme edit-xcode
  

• Remove unused framework references.

• Change preview window size

• Add support Crystal language (@crjaensch)