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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 std::io::Write;
use std::ops::Deref;
use libimagstore::store::Entry;
use libimagstore::store::FileLockEntry;
use crate::error::Result;
pub trait Viewer {
fn view_entry<W>(&self, e: &Entry, sink: &mut W) -> Result<()>
where W: Write;
fn view_entries<I, E, W>(&self, entries: I, sink: &mut W) -> Result<()>
where I: Iterator<Item = E>,
E: Deref<Target = Entry>,
W: Write
{
for entry in entries {
self.view_entry(entry.deref(), sink)?;
}
Ok(())
}
}
/// Extension for all iterators, so that an iterator can be viewed with:
///
/// ```ignore
/// iter.view::<Viewer, _>(&mut sink)
/// ```
///
pub trait ViewFromIter {
fn view<V, W>(self, sink: &mut W) -> Result<()>
where V: Viewer + Default,
W: Write;
fn view_with<V, W>(self, v: V, sink: &mut W) -> Result<()>
where V: Viewer,
W: Write;
}
impl<I, E> ViewFromIter for I
where I: Iterator<Item = E>,
E: Deref<Target = Entry>
{
fn view<V, W>(self, sink: &mut W) -> Result<()>
where V: Viewer + Default,
W: Write
{
self.view_with(V::default(), sink)
}
fn view_with<V, W>(self, v: V, sink: &mut W) -> Result<()>
where V: Viewer,
W: Write
{
v.view_entries(self, sink)
}
}
pub trait IntoViewIter<V, W, F, T>
where Self: Iterator<Item = T> + Sized,
V: Viewer,
W: Write,
F: Fn(&T) -> Option<&FileLockEntry>,
T: Sized,
{
fn view_all_if(self, v: V, sink: &mut W, func: F) -> ViewIter<Self, V, W, F, T> {
ViewIter {
inner: self,
viewer: v,
func,
sink,
}
}
}
impl<I, V, W, F, T> IntoViewIter<V, W, F, T> for I
where I: Iterator<Item = T>,
V: Viewer,
W: Write,
F: Fn(&T) -> Option<&FileLockEntry>,
T: Sized,
{
// default impl
}
pub struct ViewIter<'a, I, V, W, F, T>
where I: Iterator<Item = T>,
V: Viewer,
W: Write,
F: Fn(&T) -> Option<&FileLockEntry>,
T: Sized,
{
inner: I,
viewer: V,
func: F,
sink: &'a mut W
}
impl<'a, I, V, W, F, T> Iterator for ViewIter<'a, I, V, W, F, T>
where I: Iterator<Item = T>,
V: Viewer,
W: Write,
F: Fn(&T) -> Option<&FileLockEntry>,
T: Sized,
{
type Item = failure::Fallible<T>;
fn next(&mut self) -> Option<Self::Item> {
if let Some(next) = self.inner.next() {
if let Some(entry) = (self.func)(&next) {
if let Err(e) = self.viewer.view_entry(&entry, self.sink) {
return Some(Err(e).map_err(failure::Error::from))
}
}
return Some(Ok(next))
}
None
}
}
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