src/core/interface/library/testmod.rs

@@ -2,7 +2,7 @@ use once_cell::sync::Lazy;
 
 use crate::core::{
     collection::{album::AlbumMonth, track::TrackFormat},
-    library::Item,
+    interface::library::Item,
 };
 
 pub static LIBRARY_ITEMS: Lazy<Vec<Item>> = Lazy::new(|| -> Vec<Item> {

src/core/interface/mod.rs

@@ -0,0 +1,2 @@
+pub mod database;
+pub mod library;

src/core/mod.rs

@@ -1,6 +1,5 @@
 pub mod collection;
-pub mod database;
+pub mod interface;
-pub mod library;
 pub mod musichoard;
 
 #[cfg(test)]

src/core/musichoard/mod.rs

@@ -6,7 +6,10 @@ pub mod musichoard_builder;
 
 use std::fmt::{self, Display};
 
-use crate::core::{collection, database, library};
+use crate::core::{
+    collection,
+    interface::{database, library},
+};
 
 /// Error type for `musichoard`.
 #[derive(Debug, PartialEq, Eq)]

src/core/musichoard/musichoard.rs

@@ -8,8 +8,10 @@ use crate::core::{
         track::{Track, TrackId, TrackNum, TrackQuality},
         Collection, MergeCollections,
     },
+    interface::{
         database::IDatabase,
         library::{ILibrary, Item, Query},
+    },
     musichoard::Error,
 };
 
@@ -468,8 +470,10 @@ mod tests {
 
     use crate::core::{
         collection::{artist::ArtistId, musicbrainz::MusicBrainz},
+        interface::{
             database::{self, MockIDatabase},
             library::{self, testmod::LIBRARY_ITEMS, MockILibrary},
+        },
         testmod::{FULL_COLLECTION, LIBRARY_COLLECTION},
     };
 

src/core/musichoard/musichoard_builder.rs

@@ -1,7 +1,6 @@
 use crate::{
     core::{
-        database::IDatabase,
+        interface::{database::IDatabase, library::ILibrary},
-        library::ILibrary,
         musichoard::musichoard::{MusicHoard, NoDatabase, NoLibrary},
     },
     Error,
@@ -79,7 +78,7 @@ impl<LIB: ILibrary, DB: IDatabase> MusicHoardBuilder<LIB, DB> {
 
 #[cfg(test)]
 mod tests {
-    use crate::core::{database::NullDatabase, library::NullLibrary};
+    use crate::core::interface::{database::NullDatabase, library::NullLibrary};
 
     use super::*;
 

src/database/json/mod.rs

@@ -7,7 +7,7 @@ use mockall::automock;
 
 use crate::core::{
     collection::Collection,
-    database::{IDatabase, LoadError, SaveError},
+    interface::database::{IDatabase, LoadError, SaveError},
 };
 
 use super::serde::{deserialize::DeserializeDatabase, serialize::SerializeDatabase};

src/database/serde/deserialize.rs

@@ -9,7 +9,7 @@ use crate::core::{
         musicbrainz::MusicBrainz,
         Collection,
     },
-    database::LoadError,
+    interface::database::LoadError,
 };
 
 #[derive(Debug, Deserialize)]

src/lib.rs

@@ -5,10 +5,7 @@ pub mod database;
 pub mod library;
 
 pub use core::collection;
-
+pub use core::interface;
-// TODO: evaluate the exports and/or how to do them
-pub use core::database::{IDatabase, NullDatabase};
-pub use core::library::{Field, ILibrary, Item, NullLibrary, Query};
 
 pub use core::musichoard::{
     musichoard::{MusicHoard, NoDatabase, NoLibrary},

src/library/beets/executor.rs

@@ -8,7 +8,7 @@ use std::{
     str,
 };
 
-use crate::core::library::Error;
+use crate::core::interface::library::Error;
 use crate::library::beets::IBeetsLibraryExecutor;
 
 const BEET_DEFAULT: &str = "beet";

src/library/beets/mod.rs

@@ -8,7 +8,7 @@ use mockall::automock;
 
 use crate::core::{
     collection::track::TrackFormat,
-    library::{Error, Field, ILibrary, Item, Query},
+    interface::library::{Error, Field, ILibrary, Item, Query},
 };
 
 macro_rules! list_format_separator {
@@ -201,7 +201,7 @@ mod testmod;
 mod tests {
     use mockall::predicate;
 
-    use crate::{collection::album::AlbumMonth, core::library::testmod::LIBRARY_ITEMS};
+    use crate::{collection::album::AlbumMonth, core::interface::library::testmod::LIBRARY_ITEMS};
 
     use super::*;
     use testmod::LIBRARY_BEETS;

src/main.rs

@@ -11,11 +11,15 @@ use structopt::StructOpt;
 
 use musichoard::{
     database::json::{backend::JsonDatabaseFileBackend, JsonDatabase},
+    interface::{
+        database::{IDatabase, NullDatabase},
+        library::{ILibrary, NullLibrary},
+    },
     library::beets::{
         executor::{ssh::BeetsLibrarySshExecutor, BeetsLibraryProcessExecutor},
         BeetsLibrary,
     },
-    IDatabase, ILibrary, MusicHoardBuilder, NoDatabase, NoLibrary, NullDatabase, NullLibrary,
+    MusicHoardBuilder, NoDatabase, NoLibrary,
 };
 
 use tui::{App, EventChannel, EventHandler, EventListener, Tui, Ui};

src/tui/lib.rs

@@ -1,4 +1,7 @@
-use musichoard::{collection::Collection, IDatabase, ILibrary, MusicHoard};
+use musichoard::{
+    collection::Collection, interface::database::IDatabase, interface::library::ILibrary,
+    MusicHoard,
+};
 
 #[cfg(test)]
 use mockall::automock;

tests/database/json.rs

@@ -6,7 +6,7 @@ use tempfile::NamedTempFile;
 use musichoard::{
     collection::{album::AlbumDate, artist::Artist, Collection},
     database::json::{backend::JsonDatabaseFileBackend, JsonDatabase},
-    IDatabase,
+    interface::database::IDatabase,
 };
 
 use crate::testlib::COLLECTION;

tests/library/beets.rs

@@ -8,8 +8,8 @@ use std::{
 use once_cell::sync::Lazy;
 
 use musichoard::{
+    interface::library::{Field, ILibrary, Item, Query},
     library::beets::{executor::BeetsLibraryProcessExecutor, BeetsLibrary},
-    Field, ILibrary, Item, Query,
 };
 
 use crate::library::testmod::LIBRARY_ITEMS;

tests/library/testmod.rs

@@ -2,7 +2,7 @@ use once_cell::sync::Lazy;
 
 use musichoard::{
     collection::{album::AlbumMonth, track::TrackFormat},
-    Item,
+    interface::library::Item,
 };
 
 pub static LIBRARY_ITEMS: Lazy<Vec<Item>> = Lazy::new(|| -> Vec<Item> {