More FormatStyle implementation for more types.

This package provides more FormatStyle implementations for various types. Many types also provide parserStrategy implementations for parsing strings into the type where appropriate.

It also provides extensions for String and string interpolation to make it easier to format values.

1: Type provided as FormatInput in the FormatStyle implementation. 2: Type provided as FormatOutput in the FormatStyle implementation. 3: Format of the output. 4: Whether the FormatStyle implementation provides a corresponding ParserStrategy. 5: Whether a convenience property is provided to access style on FormatStyle. 6: Formats the input as a comma-separated list.

let number = 123.456
let formatted = "The number is \(number, .number)"
// formatted == "The number is 123.456"

let point = CGPoint(x: 1.234, y: 5.678)
let formatted = point.formatted(.decimal(places: 2))
// formatted == "(1.23, 5.68)"

The initial priority is to expose formats and parsers for more SIMD/CG types. Some common helper format styles will be added (e.g. "field" parser - see TODO).

• Find and handle all the TODOs
• Add more .formatted() and .formatted(_ style:) functions where appropriate
• Add sugar for parsing (does a standard library equivalent to .formatted() exist?)
• Investigate attribute strings and other non-string FormatOutput types
• More CoreGraphics types
• Yet another CGColor to web colour converter
• Do all SIMD types in a sane way
• Make a "field" type generic format, e.g. represent CGPoint as x: 1.234, y: 5.678 (use for SIMD and other CG types)
• A parser for angle would be nice but Measurement<Angle> has no parser we can base it off.
• Investigate a "Parsable" and "Formattable" protocol that provides a .formatted() etc functions.

• https://developer.apple.com/documentation/foundation/formatstyle
• https://developer.apple.com/documentation/foundation/parseableformatstyle
• https://developer.apple.com/documentation/foundation/floatingpointformatstyle

• https://fuckingformatstyle.com