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//
// imag - the personal information management suite for the commandline
// Copyright (C) 2015-2020 Matthias Beyer <mail@beyermatthias.de> and contributors
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; version
// 2.1 of the License.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
use anyhow::Result;
use anyhow::Context;
use anyhow::Error;
use libimagstore::iter::get::StoreGetIterator;
use libimagstore::store::FileLockEntry;
use crate::mail::Mail;
pub struct MailIterator<'a> {
inner: StoreGetIterator<'a>,
ignore_ungetable: bool,
}
impl<'a> MailIterator<'a> {
pub fn new(sgi: StoreGetIterator<'a>) -> Self {
MailIterator { inner: sgi, ignore_ungetable: true }
}
pub fn ignore_ungetable(mut self, b: bool) -> Self {
self.ignore_ungetable = b;
self
}
}
pub trait IntoMailIterator<'a> {
fn into_mail_iterator(self) -> MailIterator<'a>;
}
impl<'a> IntoMailIterator<'a> for StoreGetIterator<'a> {
fn into_mail_iterator(self) -> MailIterator<'a> {
MailIterator::new(self)
}
}
impl<'a> Iterator for MailIterator<'a> {
type Item = Result<FileLockEntry<'a>>;
fn next(&mut self) -> Option<Self::Item> {
while let Some(n) = self.inner.next() {
match n {
Ok(Some(fle)) => {
match fle.is_mail().context("Checking whether entry is a Mail").map_err(Error::from) {
Err(e) => return Some(Err(e)),
Ok(true) => return Some(Ok(fle)),
Ok(false) => continue,
}
},
Ok(None) => if self.ignore_ungetable {
continue
} else {
return Some(Err(anyhow!("Failed to get one entry")))
},
Err(e) => return Some(Err(e)),
}
}
None
}
}
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