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use std::rc::Rc;
use std::ops::Drop;
use std::fmt::Debug;
use from_variants::FromVariants;
use ffi;
use Query;
use Thread;
#[derive(Clone, Debug, FromVariants)]
pub(crate) enum ThreadsOwner {
Query(Query),
}
#[derive(Debug)]
pub struct ThreadsPtr(*mut ffi::notmuch_threads_t);
impl Drop for ThreadsPtr
{
fn drop(&mut self) {
unsafe { ffi::notmuch_threads_destroy(self.0) };
}
}
#[derive(Clone, Debug)]
pub struct Threads
{
ptr: Rc<ThreadsPtr>,
owner: Box<ThreadsOwner>,
}
impl Threads
{
pub(crate) fn from_ptr<O>(ptr: *mut ffi::notmuch_threads_t, owner: O) -> Threads
where
O: Into<ThreadsOwner>,
{
Threads {
ptr: Rc::new(ThreadsPtr(ptr)),
owner: Box::new(owner.into()),
}
}
}
impl Iterator for Threads
{
type Item = Thread;
fn next(&mut self) -> Option<Self::Item> {
let valid = unsafe { ffi::notmuch_threads_valid(self.ptr.0) };
if valid == 0 {
return None;
}
let cthrd = unsafe {
let thrd = ffi::notmuch_threads_get(self.ptr.0);
ffi::notmuch_threads_move_to_next(self.ptr.0);
thrd
};
Some(Thread::from_ptr(cthrd, self.clone()))
}
}