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draft 5.3.0 release notes

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John Kerl 2017-11-18 18:44:56 -05:00
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Features:
## Features:
* comment-skipper
* `count-similar` verb
* `.*` int math
* `popcount` function
* **Comment strings in data files:** `mlr --skip-comments` allows you to
filter out input lines starting with `#`, for all file formats. Likewise, `mlr
--skip-comments-with X` lets you specify the comment-string `X`. Comments are
only supported at start of data line.
```seq 1 32 | mlr --nidx put '$2=bitcount(NR)' then sort -n 2```
* The [**count-similar**](http://johnkerl.org/miller-releases/miller-5.2.0/doc/reference-verbs.html#count-similar)
verb lets you compute cluster sizes by cluster labels.
Documentation:
* While Miller DSL arithmetic gracefully overflows from 64-integer to
double-precision float (see also
[**here**](http://johnkerl.org/miller/doc/reference.html#Arithmetic)), there
are now the **integer-preserving arithmetic operators** ``.+` `.-` `.*` `./` `.//`
for those times when you want integer overflow.
* ruby/python/etc. dkvp-reader/writers, and example code
* 'How do I suppress numeric conversion?' @ mlh w/ pagelink; xref to followup task (#150 ...)
* csvlite at mlh/man
* There is a new [**bitcount**](http://johnkerl.org/miller-releases/miller-5.2.0/doc/reference-dsl.html#bitcount) function: for example, `echo x=0xf0000206 | mlr put '$y=bitcount($x)'` produces `x=0xf0000206,y=7`.
Bugfixes:
* [**Issue 158**](https://github.com/johnkerl/miller/issues/158): `mlr -T` is
an alias for `--nidx --fs tab`, and `mlr -t` is an alias for `mlr
--tsvlite`.
* fix https://github.com/johnkerl/miller/issues/158: short option for `--nidx --fs tab`
* Fix https://github.com/johnkerl/miller/issues/159: regex-match of literal dot
## Documentation:
* As noted
[**here**](http://johnkerl.org/miller-releases/miller-5.2.0/doc/reference-dsl.html#A_note_on_the_complexity_of_Miller’s_expression_language), since Miller has its own DSL there will always be things better expressible in a general-purpose language. The new page
[**Sharing data with other languages**](http://johnkerl.org/miller-releases/miller-5.2.0/doc/data-sharing.html) shows how to seamlessly share data back and forth between Miller, Ruby, and Python.
* [**Issue 150**](https://github.com/johnkerl/miller/issues/150) raised a
question about suppressing numeric conversion. This resulted in a new FAQ entry
[**How do I suppress numeric conversion?**](http://johnkerl.org/miller/doc/faq.html#How_do_I_suppress_numeric_conversion?), as well as the
longer-term follow-on [**issue 151**](https://github.com/johnkerl/miller/issues/151) which will make numeric conversion happen on a just-in-time basis.
* To my surprise, **csvlite format options** weren’t listed in `mlr --help` or the manpage. This has been fixed.
## Bugfixes:
* [**Issue 159**](https://github.com/johnkerl/miller/issues/159): fix regex-match of literal dot.