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+//
+// imag - the personal information management suite for the commandline
+// Copyright (C) 2015-2019 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::path::Path;
+
+use failure::Fallible as Result;
+
+use libimagentryref::hasher::Hasher;
+
+pub struct MailHasher;
+
+impl Hasher for MailHasher {
+ const NAME: &'static str = "MailHasher";
+
+ /// hash the file at path `path`
+ ///
+ /// TODO: This is the expensive implementation. We use the message Id as hash, which is
+ /// convenient and _should_ be safe
+ ///
+ /// TODO: Confirm that this approach is right
+ fn hash<P: AsRef<Path>>(path: P) -> Result<String> {
+ ::util::get_message_id_for_mailfile(path)
+ }
+}