https://github.com/apple/swift-argument-parser is a more standardized way to organize arguments, options, and flags. XCTestHTMLReport's current implementation is outdated and does not conform to some POSIX standards like exit codes, help text, etc.

This is a potentially breaking change. We will ensure existing args/flags/etc. remain backwards compatible, but there is still the chance for unexpected behavior to occur.

A notable example is the usage of stdout and stderr. The current implementation outputs everything through stdout whereas Swift Argument Parser may use stderr for error messages and non-zero exit codes.

Overview of command changes:

• In addition to the -r flag, xcresult paths are now specified via positional args
• In addition to the -i flag, the rendering mode may be specified via --rendering-mode options (inline or linking)
• -o or --output may be used to specify the output directory, defaults to the xcresult location
• Most flags now support long names in addition to their abbreviated versions, e.g. -j or --junit-enabled