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* Add `ToCString` trait.C. Morgan Hamill2015-03-20
| | | | | | | | Allows easy conversion of any `T: AsOsStr` to a `CString`, whose `as_ptr()` method is quite convenient for FFI calls. Note that `std::path::Path` implements `AsOsStr`, which means we can easily take paths and get a pointer to `*const libc::c_char`.
* Add `ToStr` and `ToStaticStr` traits.C. Morgan Hamill2015-03-20
| | | | | | | | Allow easy mapping of borrowed C strings to borrowed strings with appropriate lifetimes. I have some doubts about this, as I'm not 100% on how lifetimes interact with the notmuch-provided strings yet.
* Add `NotmuchEnum` trait and `notmuch_enum!` macro.C. Morgan Hamill2015-03-19
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.