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***************
Version History
***************
The version history of the metadata syntax is given below.
0.21 - 2023-08-30
=================
Changed
-------
- The syntax for substitution placeholders is now zero-indexed and uses curly
braces instead of percentage signs. For example, ``%1% %2%`` is now
``{0} {1}``.
Removed
-------
- Support for the ``LOOT`` file path alias. It will now be interpreted as a
normal path, i.e. a file or folder named ``LOOT`` in the game's data path.
0.18 - 2022-02-27
=================
Added
-----
- The condition function ``readable(filesystem_path path)``, which checks if
the given path is a readable directory or file.
Changed
-------
- The documentation for the version comparison condition functions has been
updated to detail the supported version syntax and semantics.
- Mentions of GitHub Flavored Markdown have been replaced with CommonMark, as
LOOT now uses the latter instead of the former.
Fixed
-----
- Support for ``not (<expression>)`` syntax was not properly documented.
- The documentation for the version comparison functions stated that missing
versions would be treated as if they were ``0``, which was not accurate.
0.17 - 2021-09-24
=================
Added
-----
- The ``File`` data structure now has a ``detail`` key that takes a string or
localised content list.
- The top-level ``prelude`` key can be used to supply common data structure
definitions, and in masterlists its value is replaced by the contents of the
masterlist prelude file, if present.
- Support for parsing inverted metadata conditions (``not (<expression>)``).
Changed
-------
- The cleaning data structure's ``info`` key has been renamed to ``detail`` for
consistency.
0.16 - 2020-07-12
=================
Changed
-------
- Equality for all metadata data structures is now determined by comparison of
all their fields. String comparison is case-sensitive, with the exception of
``File``'s ``name`` field.
Removed
-------
- The ``enabled`` field has been removed from plugin metadata objects.
0.15 - 2019-11-05
=================
Added
-----
- The condition function ``is_master(file_path path)``, which checks if the
given file is an installed master plugin.
0.14 - 2018-12-09
=================
Added
-----
- The ``Group`` data structure now has a ``description`` key that takes a string
value.
- The condition function ``product_version(file_path path, version
given_version, comparison_operator comparator)``, which checks against the
Product Version field of an executable.
Changed
-------
- ``clean`` and ``dirty`` metadata are now allowed in regex plugin entries.
- ``Location``, ``Message``, ``MessageContent`` and ``Tag`` equality comparisons
are now case-sensitive.
- Regular expressions in condition strings now use a `modified Perl grammar`_
instead of a modified ECMAScript grammar. ``Plugin`` object ``name`` fields
still use the modified ECMAScript grammar for regex values. To improve
portability and avoid mistakes, it's best to stick to using the subset of
regular expression features that are common to both grammars.
Removed
-------
- The change in regular expression grammar means that the following regular
expression features are no longer supported in condition strings:
- ``\c<letter>`` control code escape sequences, use ``\x<hex>`` instead
- The ``\0`` null escape sequence, - use ``\x00`` instead
- The ``[:d:]``, ``[:w:]`` and ``[:s:]`` character classes,
use ``[:digit:]``, ``[:alnum:]`` and ``[:space:]`` instead respectively.
- ``\<number>`` backreferences
- ``(?=<subpattern>)`` and ``(?!<subpattern>)`` positive and negative lookahead
.. _modified Perl grammar: https://docs.rs/regex/1.0.5/regex/index.html#syntax
0.13 - 2018-04-02
=================
Added
-----
- The ``Group`` data structure.
- The ``groups`` list to the root of the metadata file format.
- The ``group`` key to the plugin data structure.
Removed
-------
- The ``priority`` field from the plugin data structure.
- The ``global_priority`` field from the plugin data structure.
0.10 - 2016-11-06
=================
Added
-----
* The ``clean`` key to the plugin data structure.
* The ``global_priority`` field to the plugin data structure.
* The ``many_active()`` condition function.
* The ``info`` key to the cleaning data structure.
Changed
-------
* Renamed the ``str`` key in the localised content data structure to ``text`` .
* The ``priority`` field of the plugin data structure now stores values between -127 and 127 inclusive.
* Regular expressions no longer accept ``\`` as a directory separator: ``/`` must now be used.
* The ``file()`` condition function now also accepts a regular expression.
* The ``active()`` condition function to also accept a regular expression.
* Renamed the dirty info data structure to the cleaning data structure.
Removed
-------
* The ``regex()`` condition function, as it has been obsoleted by the ``file()`` function's new regex support.
0.8 - 2015-07-22
================
Added
-----
* The ``name`` key to the location data structure.
* The ``many("regex")`` condition function.
* The documentation now defines the equality criteria for all of the metadata syntax's non-standard data structures.
Changed
-------
* Detection of regular expression plugin entries. Previously, a plugin entry was treated as having a regular expression filename if the filename ended with ``\.esp`` or ``\.esp`` . Now, a plugin entry is treated as having a regular expression filename if the filename contains one or more of ``:\*?|`` .
Removed
-------
* Removed the ``ver`` key in the location data structure.
Fixed
-----
* The documentation gave the values of the ``after`` , ``req`` , ``inc`` , ``tag`` , ``url`` and ``dirty`` keys as lists, when they have always been sets.
0.7 - 2015-05-20
================
Added
-----
* The message string substitution key, i.e. ``sub`` , in the message data structure.
* Support for YAML merge keys, i.e. ``<<`` .
Changed
-------
* Messages may now be formatted using most of GitHub Flavored Markdown, minus the GitHub-specific features (like @mentions, issue/repo linking and emoji).
0.6 - 2014-07-05
================
No changes.
0.5 - 2014-03-31
================
Initial release.