A command line parser

Project

• License: GNU Lesser General Public License, either version 3, or (at your option) any later version.
• This project follows Semantic Versioning 2.0.0

Features

• No debts. It's an argument parser, so standard Rust is enough.
• parse_file() helps parse arguments stored in your file.
• docs helps make documentation for your program.
• Optional bin feature provides a program which helps you generate simple Rust source code templates. You can run the program with help command for more details.

Specification

A program argument can be:

• A command.
• An argument.
• An option.
• A special phrase: --.

1. Commands

   • A command can be anything which does not start with either - or --.

2. Arguments

   • Same as a command, an argument can be anything which does not start with either - or --.

3. Options

   An option starts with - or --.

   • - supports a single short format option.

   • -- supports a single long format option.

   • Option values can be anything.

   • An option's key and value can be separated by either:

     • An equals sign =.
     • Or mutiple white spaces.

   • A boolean option has 2 values: true and false. The value is optional. If absent, true will be assigned.

4. Special phrases

   • -- means: the program should process all phrases after it as arguments. This is normally used to pass arguments to sub process.

5. Passing arguments to a program

   Must be in this form:

   program [command|arguments...|options...|-] [-- [arguments...]]
   

   in which:

   • [] means optional.
   • ... means multiple arguments.