Explicit support for the common date formats of yyyy-mm-dd and yyyy-dd-mm

[SebastianMC]

Background

At glance, the \-d+ seems to be equivalent to the above formats, yet there is a subtle difference.
When the regexp matches are expanded, the \-d+ is treated as a number and uses number-specific expansion. For example 2012-11-14 is expanded to a title prefix of 00002012|00000011|00000014// (or similar, example to show the idea).

This works for sorting in general, yet when there is a need to mix this sorting with date-based suffixes of prefixes, there is a problem.

Namely, the explicit date patterns are expanded to ISO date format, so for the pattern \[Mmm-dd-yyyy] and a match of Nov-14-2012 the title prefix generated is 2012-11-14//. This obviously will not sort correctly with title prefix as 00002012|00000011|00000014//

Goal

The common date formats of yyyy-mm-dd and yyyy-dd-mm should allow mixing different date formats and prefix- plus suffix- notations within the same sorting rule

Specs

New syntax to introduce:

• yyyy-mm-dd
• yyyy-dd-mm

and the typical usage should be covered by integration tests:

---
sorting-spec: |
   /+ ... \[yyyy-Www (mm-dd)]
   /+ ... \[yyyy-Www]
   /+ ... mm-dd \[yyyy-mm-dd]
   /+ ... dd-mm \[yyyy-dd-mm]
   /+ ... \[yyyy-mm-dd]
   /+ ... \[Mmm-dd-yyyy]
   /+ \[dd-Mmm-yyyy] ...
     > a-z
---

[SebastianMC]

Plugin release 3.1.1 comes with this feature.