swirl 2.1.1

v2.1.1

• Fixed a bug in the third lesson of Intro to R.

v2.1.0

• parse_content() now parses content (at runtime) in its original form (R Markdown, YAML, etc.), making conversion to CSV files unnecessary. The appropriate parsing method is called based on the extension of the lesson file. Creating a new course authoring format is as simple as writing a new method for parse_content() that accepts the content as input and returns a properly structured lesson object.
• author_lesson() function creates and opens a customized lesson template for authoring content.
• Suite of functions for installing (and uninstalling) swirl courses:
  • install_course_directory(): Install a course from a course directory
  • install_course_dropbox(): Install a course from a zipped course directory shared on Dropbox
  • install_course_github(): Install a course from a GitHub repository
  • install_course_google_drive(): Install a course from a zipped course directory shared on Google Drive
  • install_course_url(): Install a course from a url that points to a zip file
  • install_course_zip(): Install a course from a zipped course folder
  • uninstall_course(): Uninstall a course
  • zip_course(): Zip a course directory
• Course authors can add custom tests for student repsonses.
  • Custom tests may be defined in the lesson directory in file named customTests.R.
  • Custom tests run in the same environment as tests provided with the package.
• Revised suite of answer tests (contained in answerTests2.R) using a more natural function call syntax.
• Revised user progress tracking and restoration.
  • Improved tracking by taking environmental "snapshots."
  • Keep a list of variables created or modified by correct responses.
  • Restore list to global environment after a lesson is suspended and resumed.
• Message notifying the user when she's completed a lesson, just prior to returning to the main menu.
• Miscellaneous big fixes