Zeroarg

Zeroarg is a zero-setup commandline argument parser. It determines operands, attributes and flags purely from syntax. However, it makes stronger assumptions and is stricter about syntax than other parsers.

Usage

Use the parse_arguments function to get a Vec of operands, flags and attributes.

Features

• Requires zero setup: operands, attributes and flags are determined entirely from syntax.
• Approximately supports traditional syntax, but differs slightly in disallowing some common patterns. For example, = is always required for values, even for short options.
• Simple conventions that require just a small parser.

Rules & assumptions

• There is no distinction between short and long options.
• Options within an argument can be separated by +.
• Options can be prefixed by --, +.
• Short options can additionally be compounded and prefixed by -.
• Attribute values must always be preceded by =.

Supported syntax

Operand

operand

Flag

--flag
+flag

Short flag

A short flag consists of a single character. It can be prefixed by a single -.

-f

Multiple flags

Multiple flags in the same argument can be delimited by +. In such cases, the argument does not require a prefix.

--flag1+flag2
+flag1+flag2
flag1+flag2

Multiple short flags

-abc

Attribute

--attribute=value
+attribute=value
attribute=value

Short attribute

A short attribute consists of a single character. It can be prefixed by a single -.

-a=value

Trailing attribute

--flag1+flag2+attribute=value
+flag1+flag2+attribute=value
flag1+flag2+attribute=value

Trailing short attribute

Here, a and b are flags and c is an attribute.

-abc=value

Operand delimiter

Any argument after an operand delimiter is parsed as an operand.

-
--
+