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use std::ops::Drop;
use ffi;
use utils::ScopedPhantomcow;
use MessageOwner;
use Message;
use Tags;
use TagsOwner;
#[derive(Debug)]
pub struct Messages<'o, O>
where
O: MessageOwner + 'o,
{
pub(crate) ptr: *mut ffi::notmuch_messages_t,
marker: ScopedPhantomcow<'o, O>,
}
impl<'o, O> Drop for Messages<'o, O>
where
O: MessageOwner + 'o,
{
fn drop(self: &mut Self) {
unsafe { ffi::notmuch_messages_destroy(self.ptr) };
}
}
impl<'o, O> Messages<'o, O>
where
O: MessageOwner + 'o,
{
pub(crate) fn from_ptr<P>(ptr: *mut ffi::notmuch_messages_t, owner: P) -> Messages<'o, O>
where
P: Into<ScopedPhantomcow<'o, O>>,
{
Messages {
ptr,
marker: owner.into(),
}
}
}
impl<'o, O> MessageOwner for Messages<'o, O> where O: MessageOwner + 'o {}
impl<'o, O> TagsOwner for Messages<'o, O> where O: MessageOwner + 'o {}
impl<'o, O> Messages<'o, O>
where
O: MessageOwner + 'o,
{
/**
* Return a list of tags from all messages.
*
* The resulting list is guaranteed not to contain duplicated tags.
*
* WARNING: You can no longer iterate over messages after calling this
* function, because the iterator will point at the end of the list.
* We do not have a function to reset the iterator yet and the only
* way how you can iterate over the list again is to recreate the
* message list.
*
* The function returns NULL on error.
*/
pub fn collect_tags<'m>(self: &'o Self) -> Tags<'m, Self> {
Tags::from_ptr(
unsafe { ffi::notmuch_messages_collect_tags(self.ptr) },
self,
)
}
}
impl<'o, O> Iterator for Messages<'o, O>
where
O: MessageOwner + 'o,
{
type Item = Message<'o, O>;
fn next(&mut self) -> Option<Self::Item> {
let valid = unsafe { ffi::notmuch_messages_valid(self.ptr) };
if valid == 0 {
return None;
}
let cthrd = unsafe {
let thrd = ffi::notmuch_messages_get(self.ptr);
ffi::notmuch_messages_move_to_next(self.ptr);
thrd
};
Some(Message::from_ptr(cthrd, ScopedPhantomcow::<'o, O>::share(&mut self.marker)))
}
}
pub trait MessagesExt<'o, O>
where
O: MessageOwner + 'o,
{
}
impl<'o, O> MessagesExt<'o, O> for Messages<'o, O> where O: MessageOwner + 'o {}
unsafe impl<'o, O> Send for Messages<'o, O> where O: MessageOwner + 'o {}
unsafe impl<'o, O> Sync for Messages<'o, O> where O: MessageOwner + 'o {}
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