cw - Count Words
wc clone in Rust.
-% cw --help cw 0.4.0 Thomas Hurst <email@example.com> Count Words - word, line, character and byte count USAGE: cw [FLAGS] [input]... FLAGS: -c, --bytes Count bytes -m, --chars Count UTF-8 characters instead of bytes -h, --help Prints help information -l, --lines Count lines -L, --max-line-length Count bytes (default) or characters (-m) of the longest line -V, --version Prints version information -w, --words Count words ARGS: <input>... Input files -% cw Dickens_Charles_Pickwick_Papers.xml 3449440 51715840 341152640 Dickens_Charles_Pickwick_Papers.xml
Line counts are optimized using the
'cw -l Dickens_Charles_Pickwick_Papers.xml' ran 3.44 ± 0.04 times faster than 'wc -l Dickens_Charles_Pickwick_Papers.xml' 4.17 ± 0.05 times faster than 'gwc -l Dickens_Charles_Pickwick_Papers.xml'
Line counts with line length are optimized using the
'cw -lL Dickens_Charles_Pickwick_Papers.xml' ran 1.73 ± 0.01 times faster than 'wc -lL Dickens_Charles_Pickwick_Papers.xml' 15.07 ± 0.07 times faster than 'gwc -lL Dickens_Charles_Pickwick_Papers.xml'
-m cw only operates on bytes, and it never cares about your locale.
'cw Dickens_Charles_Pickwick_Papers.xml' ran 1.34 ± 0.00 times faster than 'wc Dickens_Charles_Pickwick_Papers.xml' 1.90 ± 0.00 times faster than 'gwc Dickens_Charles_Pickwick_Papers.xml'
-m enables UTF-8 processing, with a fast-path for just character length, again
'cw -m Dickens_Charles_Pickwick_Papers.xml' ran 30.21 ± 0.39 times faster than 'gwc -m Dickens_Charles_Pickwick_Papers.xml' 70.36 ± 0.91 times faster than 'wc -m Dickens_Charles_Pickwick_Papers.xml'
'cw -m test-utf-8.html' ran 84.74 ± 1.12 times faster than 'wc -m test-utf-8.html' 124.21 ± 1.64 times faster than 'gwc -m test-utf-8.html'
And another path for character and line length:
'cw -mlL Dickens_Charles_Pickwick_Papers.xml' ran 3.59 ± 0.01 times faster than 'gwc -mlL Dickens_Charles_Pickwick_Papers.xml' 8.36 ± 0.01 times faster than 'wc -mlL Dickens_Charles_Pickwick_Papers.xml'
'cw -mlL test-utf-8.html' ran 10.05 ± 0.05 times faster than 'wc -mlL test-utf-8.html' 20.22 ± 0.11 times faster than 'gwc -mlL test-utf-8.html'
And a slow path for everything else:
'cw -mLlw Dickens_Charles_Pickwick_Papers.xml' ran 1.04 ± 0.00 times faster than 'gwc -mLlw Dickens_Charles_Pickwick_Papers.xml' 2.41 ± 0.01 times faster than 'wc -mLlw Dickens_Charles_Pickwick_Papers.xml'
These tests are on FreeBSD 12 on a 2.1GHz Westmere Xeon.
gwc is from GNU
For best results build with:
cargo build --release --features runtime-dispatch-simd
This enables SIMD optimizations for line and character counting. It has no effect if you count anything else.
- Test suite.
- Factor internals out into a library. (#1)
- Improve multibyte support.
- Possibly implement locale.
- Replace clap/structopt with something lighter.
uwc focuses on following Unicode rules as precisely as possible, taking into account less-common newlines, counting graphemes as well as codepoints, and following Unicode word-boundary rules precisely.
The cost of this is currently a great deal of performance, with counts on my benchmark file taking over a minute.
cw was originally called rwc until I noticed this existed. It's quite old and doesn't appear to compile.
A little library that only does plain newline counting, along with a binary
lc. Version 0.2 will use the same algorithm as