feat: store and use m3u files on filesystem for playlists

closes #306
closes #307
closes #66

playlist/playlist_test.go

@@ -0,0 +1,57 @@
+package playlist_test
+
+import (
+	"testing"
+
+	"github.com/matryer/is"
+	"go.senan.xyz/gonic/playlist"
+)
+
+func TestPlaylist(t *testing.T) {
+	is := is.New(t)
+
+	tmp := t.TempDir()
+	store, err := playlist.NewStore(tmp)
+	is.NoErr(err)
+
+	playlistIDs, err := store.List()
+	is.NoErr(err)
+	is.True(len(playlistIDs) == 0)
+
+	for _, playlistID := range playlistIDs {
+		playlist, err := store.Read(playlistID)
+		is.NoErr(err)
+		is.True(!playlist.UpdatedAt.IsZero())
+	}
+
+	before := playlist.Playlist{
+		UserID: 10,
+		Name:   "Examlpe playlist name",
+		Comment: `
+Example comment
+It has multiple lines 👍
+`,
+		Items: []string{
+			"item 1.flac",
+			"item 2.flac",
+			"item 3.flac",
+		},
+		IsPublic: true,
+	}
+
+	newPath := playlist.NewPath(before.UserID, before.Name)
+	is.NoErr(store.Write(newPath, &before))
+
+	after, err := store.Read(newPath)
+	is.NoErr(err)
+
+	is.Equal(before.UserID, after.UserID)
+	is.Equal(before.Name, after.Name)
+	is.Equal(before.Comment, after.Comment)
+	is.Equal(before.Items, after.Items)
+	is.Equal(before.IsPublic, after.IsPublic)
+
+	playlistIDs, err = store.List()
+	is.NoErr(err)
+	is.True(len(playlistIDs) == 1)
+}