[neomutt-devel] Rules not Lists

[Richard Russon]

All the code to set config variables used to live in parse_set().
It was an enormous function containing lists of variables which should be
treated in a special ways.

The new config code breaks up this function by defining types (which
live in config/*.c) and giving them control over what is valid, or not.

Each type can be sub-typed by adding flags, e.g declaring:
- Strings DT_NOT_EMPTY
- Numbers DT_NOT_NEGATIVE

For finer-grained control, you can add a 'validator' to any config item.

The header cache has a string config item "header_cache_backend".
Its validator checks that the string is one of "tokyocabinet", "lmdb", etc

Note: The validators are called as needed, so they can make decisions
      based on the current state.

The pager validator, determines if a variable can be set depending on
whether the user is currently viewing an email.

These changes mean that features can define their own complex config
types, but NeoMutt doesn't need to understand them.

More code and knowledge coming soon.

Rich / FlatCap
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