flood-tide

flood-tide is 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 error
• only UTF-8 arguments
• it can be used optimally by a compile switch with many features.

Todos

• [x] multiple error
• [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

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 | 1.750 kc | 318 kib | 0.000 kc | 0 kib | | cmpflood-tide | 6.754 kc | 372 kib | 5.004 kc | 54 kib | | cmpgumdrop | 14.251 kc | 474 kib | 12.500 kc | 156 kib | | cmpargh | 26.205 kc | 404 kib | 24.455 kc | 85 kib | | cmppicoargs | 156.760 kc | 413 kib | 155.010 kc | 94 kib | | cmprustop | 429.286 kc | 495 kib | 427.536 kc | 177 kib | | cmpclap | 572.439 kc | 934 kib | 570.688 kc | 616 kib | | cmpgetopts | 688.350 kc | 408 kib | 686.600 kc | 90 kib | | cmpstructopt | 714.529 kc | 1015 kib | 712.778 kc | 697 kib | | cmpcommander | 749.754 kc | 421 kib | 748.004 kc | 102 kib | | cmplapp | 1130.293 kc | 461 kib | 1128.543 kc | 142 kib | | cmpargs | 2070.766 kc | 459 kib | 2069.016 kc | 140 kib | | cmpapp | 2394.380 kc | 707 kib | 2392.630 kc | 388 kib | | cmpdocopt | 5715.680 kc | 1690 kib | 5713.930 kc | 1371 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
• refer comparison of various parsers