Traits and implementations for parsing command-line arguments.
This crate provides traits and implementations for parsing command-line arguments.
The core of the crate is ParseArg trait. It works much like FromStr trait, but with
these differences:
&OsStr instead of &str, thus allowing wider range of possible inputs.parse_owned_arg() method which can be specialized to avoid allocations.describe_type() to print human-readable description.
of expected input.Display in order to enable user-friendly interface.Further, the crate provides ParseArgFromStr trait, which causes any type implementing it to
auto-implement ParseArg trait. This is handy when implementing ParseArg for types that
already have FromStr implemented, so that boilerplate is reduced.
Since matching both --foo VAL and --foo=VAL arguments is common and it's not an easy task to
implement on top of OsStr, due to limitation of std, this crate also provides a function to
match and parse such arguments.
I will merge new implementations liberally, provided these conditions are met:
std or in another crate which is added as an optional dependency.MITNFA