after_install / postflight mini-DSL

[rolandwalker]

after_install (soon to be renamed postflight) and other similar blocks should have a mini-DSL for common functionality, like caveats does.

references: #5266.

[federicobond]

What common functionality, besides #5266, is needed here?

[rolandwalker]

Definitely wanted:

• enable accessibility access #5266, accessibility
• Suppress "move to applications" as in alfred.rb
• A front-end to SystemCommand.run that accepts only list-form commands (and then consider disabling system within the mini-DSL)

Wishlist:

• A wrapper for PlistBuddy that reduces boilerplate. For example, once we change link to app, Info.plist has a default location. So this line from pycharm.rb

  system "/usr/libexec/PlistBuddy", "-c", "Set :JVMOptions:JVMVersion 1.6+", "#{destination_path}/PyCharm.app/Contents/Info.plist"

  might be reduceable to

  plist_set(':JVMOptions:JVMVersion', '1.6+')

• A wrapper for ln might have a few advantages: better error reporting, and control of behavior when the file already exists.

• Anything else that shows up more than two or three times in after_install is a candidate.

[rolandwalker]

Also

• ability to quit apps, unload launchctl services, etc as is available in uninstall
• ability to remove icons from the Dock