lnav v0.12.1 released!

[lnav support]

lnav v0.12.1 has been released here:

https://github.com/tstack/lnav/releases/tag/v0.12.1

Features:

* Database queries can now be written in

  [PRQL](https://prql-lang.org).  When executing a query with `;`,

  if the query starts with `from`, it will be treated as PRQL.

  The pipeline structure of PRQL queries is more desirable for

  interactive use since lnav can make better suggestions and

  show previews of the stages of the pipeline.

* Log partitions can automatically be created by defining a log

  message pattern in a log format.  Under a format definition,

  add an entry into the "partitions" object in a format definition.

  The "pattern" property specifies the regular expression to match

  against a line in a file that matches the format.  If a match is

  found, the partition name will be set to the value(s) captured

  by the regex.  To restrict matches to certain files, you can add

  a "paths" array whose object elements contain a "glob" property

  that will be matched against file names.

Interface changes:

* When using PRQL in the database query prompt (`;`),

  the preview pane will show the results for the pipeline

  stage the cursor is within along with the results of

  the previous stage (if there is one).  The preview

  works on a limited data set, so the preview results

  may differ from the final results.

* Changed the breadcrumb bar styling to space things out

  more and make the divisions between items clearer.

* The `ESC` key can now be used to exit the files/filters

  configuration panel instead of `q`.  This should make

  it easier to avoid accidentally exiting lnav.

* Added some default help text for the command prompt.

* Suggestions are now shown for some commands and can

  be accepted by pressing the right arrow key.  For

  example, after typing in `:filter-in` the current

  search term for the view will be suggested (if

  one is active).

* The focused line should be preserved more reliably in

  the LOG/TEXT views.

* In the LOG view, the current partition name (as set

  with the `:partition-name` command) is shown as the

  first breadcrumb in the breadcrumb bar.  And, when

  that breadcrumb is selected, you can select another

  partition to jump to.

* The `{` / `}` hotkeys, `:next-section`, and `:prev-section`

  commands now work in the LOG view and take you to the

  next/previous partition.

* The DB view now defaults to not showing bar charts.

Breaking changes:

* Many of the lesser used column in the log format tables

  (e.g. `log_tags`) have been moved to after the columns

  defined by the format.  These columns are usually `NULL`

  and are a distraction when previewing queries.