flood-tide

Command line flag and option parse utilities.

Features

• no_std and std are supported.
• flags, options, subcommand and free arguments
• short flags and options (like -a)
• long flags and options (like --long)
• combined short flags (like -abc ::= -a -b -c)
• single long options (like -long)
• abbreviate long options (like --abbr ::= --abbreviate)
• single error or multiple errors
• only UTF-8 arguments
• it can be used optimally by a compile switch with many features.
• minimum support: rustc 1.41.1 (f3e1a954d 2020-02-24)

Todos

• [x] multiple errors
• [x] no_std
• [ ] option suggestion (do you mean? '--abc')
• [ ] windows style (like /a)
• [ ] source code generator support tools
• [ ] more easy use

Non-Supports

• procedural macro style
• traditional macro style
• non UTF-8 arguments, multibyte or wide charactor

Examples

in examples directory.

• manual coding style: bsd-sed.rs, gnu-cat.rs
• single long options: ffmpeg.rs
• source code generating by xtask and parsesimplegnu_style(): curl.rs

Supports

• flood-tide-gen - the generating flood-tide tables
• aki-gsub - the sample used flood-tide

Alternatives

This parser is not a new special idea. It's just comparing characters one by one. Is there anything simpler than this?

• clap - is the most popular and complete one
• structopt - clap parser that uses procedural macros
• gumdrop - a simple parser that uses procedural macros
• argh - procedural macros
• rustop - traditional macro
• pico-args - a simple use
• getopts - a simple use
• docopt - a simple use

Benchmarks

The comparing performance and .text size.

| name | bench | .text | Δ bench | Δ .text | |:-------------------|------------:|---------:|------------:|---------:| | cmpnullvoid | 1.213 kc | 342 kib | 0.000 kc | 0 kib | | cmpfloodtide | 5.439 kc | 386 kib | 4.226 kc | 43 kib | | cmpgumdrop | 10.686 kc | 456 kib | 9.473 kc | 114 kib | | cmppurerust | 11.052 kc | 390 kib | 9.839 kc | 47 kib | | cmpargh | 23.644 kc | 429 kib | 22.431 kc | 86 kib | | cmppicoargs | 152.401 kc | 457 kib | 151.188 kc | 114 kib | | cmprustop | 429.309 kc | 497 kib | 428.096 kc | 155 kib | | cmpclap | 488.611 kc | 925 kib | 487.399 kc | 583 kib | | cmpgetopts | 695.832 kc | 428 kib | 694.620 kc | 85 kib | | cmpstructopt | 697.229 kc | 1083 kib | 696.016 kc | 741 kib | | cmpcommander | 712.974 kc | 437 kib | 711.762 kc | 94 kib | | cmplapp | 1113.328 kc | 476 kib | 1112.115 kc | 133 kib | | cmpargs | 2017.061 kc | 489 kib | 2015.848 kc | 146 kib | | cmpapp | 2348.416 kc | 720 kib | 2347.203 kc | 377 kib |

• us is micro seconds
• .text is elf .text section size
• Δ(delta) is the difference from cmpnullvoid
• cmp_null_void is non parser, support only --help and --version
• cmp_pure_rust is newly written with sting match
• compile by rustc 1.56.1 (59eed8a2a 2021-11-01)
• bench on intel Q6600 @ 2.40GHz
• refer comparison of various parsers

Changelogs

This crate's changelog here.

License

This project is licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)

at your option.