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Implements enum types in pairs, specifying the type and variant names of
each, like so:
notmuch_enum! {
pub enum enum_name => EnumName {
variant_one => VariantOne,
variant_two => VariantTwo
}
}
Which expands to:
pub enum enum_name {
variant_one,
variant_two
}
pub enum EnumName {
VariantOne,
VariantTwo
}
The `NotmuchEnum` trait also entails two functions to convert between
the defined pairs, `from_notmuch_t()` and `to_notmuch_t()`. The macro
takes care of their implementation, also.
Yes, this is purely aesthetic whimsy: I wanted the types in the `ffi`
module to match the types from the `notmuch.h` file, and I wanted the
types I used within (and exported by) this crate to match the expected
Rust convention.
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