From 41f9ecc73b66ab1a775e5609a0cc7b38b8300b8c Mon Sep 17 00:00:00 2001
From: Jonathan Matthews <github@hello.jonathanmatthews.com>
Date: Fri, 11 Nov 2022 23:44:44 +0200
Subject: [PATCH] Introduce new DB type: DelimeteredString

---
 beets/dbcore/types.py | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/beets/dbcore/types.py b/beets/dbcore/types.py
index 40f6a0805..8ab3bcfa2 100644
--- a/beets/dbcore/types.py
+++ b/beets/dbcore/types.py
@@ -207,6 +207,29 @@ class String(Type):
         else:
             return self.model_type(value)
 
+class DelimeteredString(String):
+    """A list of Unicode strings, represented in-database by a single string
+    containing delimiter-separated values.
+    """
+    model_type = list
+
+    def __init__(self, delim=','):
+        self.delim = delim
+
+    def to_sql(self, model_value):
+        return self.delim.join([str(elem) for elem in model_value])
+
+    def from_sql(self, sql_value):
+        if sql_value is None:
+            return self.null()
+        else:
+            return self.parse(sql_value)
+
+    def parse(self, string):
+        try:
+            return string.split(self.delim)
+        except:
+            return self.null
 
 class Boolean(Type):
     """A boolean type.
@@ -231,3 +254,4 @@ FLOAT = Float()
 NULL_FLOAT = NullFloat()
 STRING = String()
 BOOLEAN = Boolean()
+SEMICOLON_DSV = DelimeteredString(delim=';')