From d59b50ccc97d3652f190a76b7b138643b55f664a Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Fri, 6 Mar 2020 13:46:57 +0100
Subject: Remove unused iter extensions

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
---
 lib/core/libimagerror/src/iter.rs | 130 --------------------------------------
 lib/core/libimagerror/src/lib.rs  |   1 -
 2 files changed, 131 deletions(-)
 delete mode 100644 lib/core/libimagerror/src/iter.rs

diff --git a/lib/core/libimagerror/src/iter.rs b/lib/core/libimagerror/src/iter.rs
deleted file mode 100644
index fa6fec1a..00000000
--- a/lib/core/libimagerror/src/iter.rs
+++ /dev/null
@@ -1,130 +0,0 @@
-//
-// imag - the personal information management suite for the commandline
-// Copyright (C) 2015-2020 the imag 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 failure::Error;
-
-/// An iterator that unwraps the `Ok` items of `iter`, while passing the `Err` items to its
-/// closure `f`.
-///
-/// This `struct` is created by the `unwrap_with()` method on `TraceIterator`. See its
-/// documentation for more information.
-#[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
-#[derive(Clone)]
-pub struct UnwrapWith<I, F>{
-    iter: I,
-    f: F
-}
-
-impl<I, F, T> Iterator for UnwrapWith<I, F>
-    where
-        I: Iterator<Item = Result<T, Error>>,
-        F: FnMut(Error)
-{
-    type Item = T;
-
-    #[inline]
-    fn next(&mut self) -> Option<Self::Item> {
-        loop {
-            match self.iter.next() {
-                Some(Err(e))   => { (self.f)(e); },
-                Some(Ok(item)) => return Some(item),
-                None           => return None,
-            }
-        }
-    }
-}
-
-
-
-/// Iterator helper for Unwrap with exiting on error
-pub struct UnwrapExit<I, T>(I)
-    where I: Iterator<Item = Result<T, Error>>;
-
-impl<I, T> Iterator for UnwrapExit<I, T>
-    where I: Iterator<Item = Result<T, Error>>,
-{
-    type Item = T;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        use crate::trace::MapErrTrace;
-        self.0.next().map(|e| e.map_err_trace_exit_unwrap())
-    }
-}
-
-impl<I, T> DoubleEndedIterator for UnwrapExit<I, T>
-    where I: DoubleEndedIterator<Item = Result<T, Error>>,
-{
-    fn next_back(&mut self) -> Option<Self::Item> {
-        use crate::trace::MapErrTrace;
-        self.0.next_back().map(|e| e.map_err_trace_exit_unwrap())
-    }
-}
-
-/// This trait provides methods that make it easier to work with iterators that yield a `Result`.
-pub trait TraceIterator<T> : Iterator<Item = Result<T, Error>> + Sized {
-    /// Creates an iterator that yields the item in each `Ok` item, while filtering out the
-    /// `Err`
-    /// items. Each filtered `Err` will be trace-logged with [`::trace::trace_error`].
-    ///
-    /// As with all iterators, the processing is lazy. If you do not use the result of this method,
-    /// nothing will be passed to `::trace::trace_error`, no matter how many `Err` items might
-    /// be present.
-    #[inline]
-    fn trace_unwrap(self) -> UnwrapWith<Self, fn(Error)> {
-        #[inline]
-        fn trace_error(err: Error) {
-            err.iter_chain().for_each(|cause| {
-                eprintln!("{}", cause);
-            });
-        }
-
-        self.unwrap_with(trace_error)
-    }
-
-    /// Creates an iterator that yields the item in each `Ok` item.
-    ///
-    /// The first `Err(_)` element is traced using `::trace::trace_error_exit`.
-    ///
-    /// As with all iterators, the processing is lazy. If you do not use the result of this method,
-    /// nothing will be passed to `::trace::trace_error_exit`, no matter how many `Err` items might
-    /// be present.
-    #[inline]
-    fn trace_unwrap_exit(self) -> UnwrapExit<Self, T> {
-        UnwrapExit(self)
-    }
-
-
-    /// Takes a closure and creates an iterator that will yield the items inside all `Ok` items
-    /// yielded by the original iterator. All `Err` items will be filtered out, and the contents
-    /// of each `Err` will be passed to the closure.
-    ///
-    /// As with all iterators, the processing is lazy. The result of this method must be evaluated
-    /// for the closure to be called.
-    #[inline]
-    fn unwrap_with<F>(self, f: F) -> UnwrapWith<Self, F>
-        where F: FnMut(Error)
-    {
-        UnwrapWith { iter: self, f }
-    }
-}
-
-impl<I, T> TraceIterator<T> for I where
-    I: Iterator<Item = Result<T, Error>>
-{}
-
diff --git a/lib/core/libimagerror/src/lib.rs b/lib/core/libimagerror/src/lib.rs
index 2358316c..fc3a33cf 100644
--- a/lib/core/libimagerror/src/lib.rs
+++ b/lib/core/libimagerror/src/lib.rs
@@ -43,7 +43,6 @@ extern crate failure;
 pub mod errors;
 pub mod exit;
 pub mod io;
-pub mod iter;
 pub mod str;
 pub mod trace;
 
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