From 6d818a3b48fe6046a0607737b3fce6323c4daa5f Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Sat, 15 Jul 2017 15:01:45 +0200
Subject: [PATCH] Add filter module for tag iterators

---
 libimagentrytimetrack/src/iter/filter.rs | 70 ++++++++++++++++++++++++
 libimagentrytimetrack/src/iter/mod.rs    |  1 +
 2 files changed, 71 insertions(+)
 create mode 100644 libimagentrytimetrack/src/iter/filter.rs

diff --git a/libimagentrytimetrack/src/iter/filter.rs b/libimagentrytimetrack/src/iter/filter.rs
new file mode 100644
index 00000000..b236c8dd
--- /dev/null
+++ b/libimagentrytimetrack/src/iter/filter.rs
@@ -0,0 +1,70 @@
+//
+// imag - the personal information management suite for the commandline
+// Copyright (C) 2015, 2016 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 error::TimeTrackError as TTE;
+use error::TimeTrackErrorKind as TTEK;
+use error::MapErrInto;
+
+use libimagstore::store::FileLockEntry;
+use libimagstore::store::Store;
+use libimagstore::storeid::StoreIdIterator;
+use libimagerror::into::IntoError;
+
+use iter::get::GetTimeTrackIter;
+use tag::TimeTrackingTag as TTT;
+use timetracking::TimeTracking;
+
+pub struct WithOneOf<'a> {
+    iter: GetTimeTrackIter<'a>,
+    allowed_tags: &'a Vec<TTT>,
+}
+
+impl<'a> WithOneOf<'a> {
+
+    pub fn new(iter: GetTimeTrackIter<'a>, allowed_tags: &'a Vec<TTT>) -> WithOneOf<'a> {
+        WithOneOf {
+            iter: iter,
+            allowed_tags: allowed_tags
+        }
+    }
+}
+
+impl<'a> Iterator for WithOneOf<'a> {
+    type Item = Result<FileLockEntry<'a>, TTE>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        loop {
+            match self.iter.next() {
+                Some(Ok(fle)) => {
+                    match fle.get_timetrack_tag() {
+                        Err(e) => return Some(Err(e)),
+                        Ok(t) => if self.allowed_tags.contains(&t) {
+                            return Some(Ok(fle))
+                        } else {
+                            // loop
+                        },
+                    }
+                },
+                Some(Err(e)) => return Some(Err(e)),
+                None => return None,
+            }
+        }
+    }
+}
+
diff --git a/libimagentrytimetrack/src/iter/mod.rs b/libimagentrytimetrack/src/iter/mod.rs
index 22dcea26..d2d78cd9 100644
--- a/libimagentrytimetrack/src/iter/mod.rs
+++ b/libimagentrytimetrack/src/iter/mod.rs
@@ -18,6 +18,7 @@
 //
 
 pub mod create;
+pub mod filter;
 pub mod get;
 pub mod setendtime;
 pub mod storeid;