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nibble's Issues

Do not regenerate the LALR table each execution

You can generate it once at build time, and include it in the release so clients do not have to build their own at all. Take a look at the optimize and picklefile options on yacc.yacc(). lex.lex() has similar features available. Pre-generate preferably, or cache.

Values that are 0.00 to 2 decimal places are rounded to 0

This is an issue for things like representing a second in terms of years (0y instead of 0.000000032y). Rather than display floats to 2dp, we want to display 2 non-zero dp. If a float is integral, we display it as an integer, otherwise we show as many decimal places as necessary to get to a non-zero decimal place, then display 2 of them.

Remember the unit category when an `Information` object is created

This behaviour is unintuitive:

print(Information(123, Information.GIBIBITS))  # '15.38 GiB'

It would be less so if the Information class remembered the unit category with which it was created, and defaulted to this category (only falling back on bB) when formatting:

print(Information(123, Information.GIBIBITS))  # '123 Gib'
print(Information(15000, Information.GIGABITS))  # '15 Tb'
print(Information(47508345203, Information.BITS))  # '5.53 GiB'

Support piping from stdin, similar to bc

Use case: stream of data quantities, one per line, e.g.

6.9Gi
13Gi
64Gi
256Mi
12Gi
40Gi
13.9375Gi
12Gi
40Gi
64Gi
.5625Gi

Want to be able to | paste -sd+ | nibble to add up.

Conversion of `Information`s between units

You seem to have managed to avoid providing a way to get an Information object in a particular unit. Intuitively, you expect to be able to do information.bytes or information.gigabytes. Consider implementing __getattr__(). You could implement it as a method that takes a unit constant, but which of these would you prefer to see?

  • int(math.ceil(size.bits / 8e+9))
  • size.to(Information.GIGABYTES)
  • size.gigabytes

Go with the last one. Should you be returning floats or decimals? Bits should always return int.

Sphinx Documentation

This project is crying out for a reference of properties and methods available on each of the three primary types, and a healthy set of example snippets. The README should be an introduction, not the documentation.

Use sane rounding

Rarely do you care about more than 1 decimal place. Wolfram Alpha gets this right.

Large inputs

Both Google and Wolfram Alpha struggle to evaluate really long expressions (partly due to URL length limits). Ensure Nibble works with such inputs, and parsing/evaluation is not prohibitively slow. E.g.

57.1GB + 59.8GB + 59.3GB + 63.6GB + 61.1GB + 59GB + 58.2GB + 59.1GB + 59.2GB + 58.1GB + 54.7GB + 58.5GB + 50.6GB + 54.6GB + 57.7GB + 56.4GB + 59.6GB + 57.5GB + 52.8GB + 58.9GB + 48.4GB + 55.3GB + 51.5GB + 52.2GB + 49.4GB + 43.7GB + 47GB + 53.6GB + 52.5GB + 49.1GB + 51.2GB + 52.8GB + 42.1GB + 40.3GB + 38.9GB + 31.6MB + 29.2MB + 15.3MB + 18.2MB + 14.9MB + 19.8MB + 12.4MB + 11.4MB + 18.5MB + 10.9MB + 12.7MB + 9.1MB + 9.6MB + 14.9MB + 10.7MB + 13.6MB + 6.9MB + 1.8MB + 11.7MB + 11.9MB + 21.3MB + 9.3MB + 4MB + 8.9MB + 10.7MB + 7.2MB + 11.8MB + 10.2MB + 10.2MB + 5.5MB + 7.7MB + 7MB + 7.6MB + 6.9MB + 7.6MB + 6.1MB + 5.7MB + 2.7MB + 2.6MB + 2.9MB + 1.9MB + 7.5MB + 3.4MB + 2MB + 2.2MB + 1.4MB + 2.2MB + 1.5MB + 1.7MB + 1.5MB + 1.8MB + 3MB + 1.4MB + 1.8MB + 1.4MB + 1.3MB + 1.5MB + 1.3MB + 6.8MB + 1.2MB + 1.2MB + 972.6KB + 1.9MB + 3MB + 984.8KB + 964.4KB + 975.1KB + 2.3MB + 961.2KB + 947.2KB + 1.2MB + 2.4MB + 1MB + 1MB + 2.2MB + 853KB + 806.6KB + 3.3MB + 1.5MB + 1MB + 1.8MB + 3.1MB + 1MB + 1.7MB + 1.8MB + 2.3MB + 7MB + 1.4MB + 4.5MB + 3.4MB + 1.8MB + 2.3MB + 683.4KB + 698KB + 698KB + 656.7KB + 717.3KB + 2.5MB + 1.5MB + 653.7KB + 1.3MB + 671.6KB + 1.1MB + 1.4MB + 672KB + 1.1MB + 997.6KB + 628.3KB + 608.6KB + 592.8KB + 748.6KB + 2.4MB + 1.5MB + 1.2MB + 643.6KB + 539KB + 1.2MB + 3MB + 1.5MB + 1MB + 568.7KB + 542.6KB + 543.7KB + 557.3KB + 565.2KB + 1.2MB + 550.3KB + 553.4KB + 521.5KB + 533.5KB + 532.9KB + 951.5KB + 1.6MB + 842.5KB + 1.4MB + 760.1KB + 1.2MB + 524.5KB + 492.5KB + 1.6MB + 626.5KB + 1.6MB + 1.6MB + 497.3KB + 490KB + 478.7KB + 452.6KB + 3.8MB + 780.7KB + 447.1KB + 471KB + 2.1MB + 446.1KB + 445KB + 851.5KB + 1.7MB + 1.2MB + 395.3KB + 419.3KB + 461.1KB + 992.9KB + 1.1MB + 1.1MB + 398.1KB + 361.7KB + 640.6KB + 953.6KB + 1.1MB + 326.4KB + 498.9KB + 284.6KB + 578.5KB + 577.9KB + 800.9KB + 1.5MB + 552.9KB + 110.6KB + 290.3KB + 314.9KB + 481KB + 299.1KB + 315.5KB + 311.8KB + 661.7KB + 170.9KB + 1.2MB + 260.5KB + 244.2KB + 1.3MB + 485.7KB + 245.7KB + 636.5KB + 172.7KB + 264.1KB + 238.1KB + 264.1KB + 756.2KB + 239.4KB + 219.8KB + 238.1KB + 500.6KB + 193.9KB + 691KB + 807.5KB + 89.8KB + 567.5KB + 313.8KB + 329.7KB + 156.9KB + 802.8KB + 177.7KB + 211.5KB + 211.5KB + 457.4KB + 193.6KB + 211.9KB + 211.9KB + 398.4KB + 172.2KB + 246.3KB + 510.9KB + 333.9KB + 333.8KB + 186.8KB + 186.1KB + 197.3KB + 181.8KB + 213KB + 196.1KB + 187.6KB + 186.8KB + 178.1KB + 176.1KB + 185.9KB + 121.8KB + 117.4KB + 751.9KB + 152.7KB + 225.8KB + 496.1KB + 164.4KB + 148.5KB + 395.4KB + 143.2KB + 159.7KB + 159KB + 159.7KB + 79.8KB + 176.6KB + 102.5KB + 138.2KB + 81.1KB + 452.8KB + 302.1KB + 119.4KB + 305.8KB + 607.4KB + 147.1KB + 144KB + 115.4KB + 115.5KB + 111.5KB + 116KB + 133KB + 144KB + 126.9KB + 135KB + 117.9KB + 134.8KB + 122.1KB + 134.9KB + 117.1KB + 73.1KB + 125KB + 134.8KB + 57KB + 195.1KB + 272.3KB + 143.4KB + 80.7KB + 273.8KB + 288.5KB + 108.1KB + 88.4KB + 107.1KB + 107.1KB + 107.1KB + 107.1KB + 107.1KB + 108.7KB + 145.4KB + 108.8KB + 771.1KB + 108.1KB + 225.1KB + 82.1KB + 100.1KB + 100.1KB + 107.4KB + 107.4KB + 84.8KB + 215.8KB + 132.8KB + 160.3KB + 242.9KB + 64.9KB + 42.4KB + 81.4KB + 81.7KB + 82.7KB + 82.6KB + 95.6KB + 82.8KB + 85.9KB + 82.5KB + 64.5KB + 64.7KB + 82.8KB + 74KB + 259KB + 49.6KB + 82.5KB + 82.6KB + 19.5KB + 39KB + 57.8KB + 227.7KB + 47.7KB + 57.9KB + 57.8KB + 63.8KB + 57.8KB + 64.4KB + 52.8KB + 34.2KB + 56.4KB + 55.8KB + 25.2KB + 57.5KB + 56.5KB + 313.2KB + 56.4KB + 56.4KB + 56.4KB + 136.1KB + 12KB + 22KB + 68.1KB + 22KB + 14.4KB + 22KB + 31.1KB + 22KB + 30.6KB + 31.1KB + 31.1KB + 31.1KB + 30.5KB + 19.3KB + 70.6KB + 31.1KB + 19.1KB + 12.4KB + 29.4KB + 29.4KB + 30.6KB + 30.5KB + 30.5KB + 30.6KB + 207.1KB + 22KB + 30.4KB + 30.5KB + 30.3KB + 30.3KB + 69.9KB + 70.6KB + 53KB + 69.9KB + 69.9KB + 4.5KB

Overflow tests

Python 2 does not have arbitrary length ints. People will want to know what happens should the sum of two large quantities overflow.

Sample expressions

Tracking issue for queries to handle:

  • 5 petabytes / 730 hours in Gb/s

Log list of tokens when debugging

This is not currently exposed in the debug output:

$ nibble -vv 400GiB at .85Mb/s
DEBUG Namespace(expression=[u'400GiB', u'at', u'.85Mb/s'], verbosity=2)
Generating LALR tables
DEBUG information = number 400.0, information unit GiB
DEBUG duration = 1 of duration unit s
DEBUG speed unit = information unit Mb per duration 1 second
DEBUG speed = number 0.85, speed unit (u'Mb', <Duration(1000000000)>)
DEBUG duration = information 400 GiB at speed 103.76 KiB/s
DEBUG expression = duration 1 month 2 weeks 2 days 8 hours 52 minutes 2 seconds 160 milliseconds 941 microseconds 177 nanoseconds
1 month 2 weeks 2 days 8 hours 52 minutes 2 seconds 160 milliseconds 941 microseconds 177 nanoseconds
DEBUG Returning exit status 0

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