music: add demo release type

This is part of the MusicBrainz spec, but I didn't think of implementing
it. Turns out it's stupidly common among music releases, so may as well.

Resolves #590.

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 #### What's New
 - Added ability to rewind/skip tracks by swiping back/forward
+- Added support for demo release type
 
 ## 3.2.1
 

app/src/main/java/org/oxycblt/auxio/detail/DetailViewModel.kt

@@ -607,6 +607,7 @@ constructor(
                             is ReleaseType.Soundtrack -> AlbumGrouping.SOUNDTRACKS
                             is ReleaseType.Mix -> AlbumGrouping.DJMIXES
                             is ReleaseType.Mixtape -> AlbumGrouping.MIXTAPES
+                            is ReleaseType.Demo -> AlbumGrouping.DEMOS
                         }
                 }
             }
@@ -709,6 +710,7 @@ constructor(
         SOUNDTRACKS(R.string.lbl_soundtracks),
         DJMIXES(R.string.lbl_mixes),
         MIXTAPES(R.string.lbl_mixtapes),
+        DEMOS(R.string.lbl_demos),
         APPEARANCES(R.string.lbl_appears_on),
         LIVE(R.string.lbl_live_group),
         REMIXES(R.string.lbl_remix_group),

app/src/main/java/org/oxycblt/auxio/music/info/ReleaseType.kt

@@ -143,6 +143,18 @@ sealed interface ReleaseType {
             get() = R.string.lbl_mixtape
     }
 
+    /**
+     * A demo. These are usually [EP]-sized releases of music made to promote an Artist or a future
+     * release.
+     */
+    data object Demo : ReleaseType {
+        override val refinement: Refinement?
+            get() = null
+
+        override val stringRes: Int
+            get() = R.string.lbl_demo
+    }
+
     /** A specification of what kind of performance a particular release is. */
     enum class Refinement {
         /** A release consisting of a live performance */
@@ -220,6 +232,7 @@ sealed interface ReleaseType {
                 type.equals("dj-mix", true) -> Mix
                 type.equals("live", true) -> convertRefinement(Refinement.LIVE)
                 type.equals("remix", true) -> convertRefinement(Refinement.REMIX)
+                type.equals("demo", true) -> Demo
                 else -> convertRefinement(null)
             }
     }

app/src/main/res/values/strings.xml

@@ -63,6 +63,10 @@
     <string name="lbl_mixtapes">Mixtapes</string>
     <!-- As in the collection of music -->
     <string name="lbl_mixtape">Mixtape</string>
+    <!-- As in the collection of music -->
+    <string name="lbl_demo">Demo</string>
+    <!-- AS in the collection of music -->
+    <string name="lbl_demos">Demos</string>
     <!-- As in a compilation of several performances that blend into a single continuous flow of music (Also known as DJ Mixes) -->
     <string name="lbl_mixes">DJ Mixes</string>
     <!-- As in a compilation of several performances that blend into a single continuous flow of music (Also known as DJ Mixes) -->

app/src/test/java/org/oxycblt/auxio/music/info/ReleaseTypeTest.kt

@@ -36,6 +36,7 @@ class ReleaseTypeTest {
         assertEquals(ReleaseType.Soundtrack, ReleaseType.parse(listOf("album", "soundtrack")))
         assertEquals(ReleaseType.Mix, ReleaseType.parse(listOf("album", "dj-mix")))
         assertEquals(ReleaseType.Mixtape, ReleaseType.parse(listOf("album", "mixtape/street")))
+        assertEquals(ReleaseType.Demo, ReleaseType.parse(listOf("album", "demo")))
     }
 
     @Test