Add saving periods

src/types.rs

@@ -0,0 +1,98 @@
+use std::fmt::{Debug, Formatter};
+use std::io::Write;
+
+use diesel::backend::Backend;
+use diesel::deserialize::FromSql;
+use diesel::serialize::{IsNull, Output, ToSql};
+use diesel::sql_types::Binary;
+use diesel::sqlite::Sqlite;
+use diesel::{deserialize, serialize};
+use serde::{Serialize, Serializer};
+use uuid::Uuid;
+
+#[derive(AsExpression, FromSqlRow, PartialEq, Clone)]
+#[sql_type = "Binary"]
+pub enum EmgauwaUid {
+    On,
+    Off,
+    Any(Uuid),
+}
+
+impl Default for EmgauwaUid {
+    fn default() -> Self {
+        EmgauwaUid::Any(Uuid::new_v4())
+    }
+}
+
+impl Debug for EmgauwaUid {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self {
+            EmgauwaUid::On => "on".fmt(f),
+            EmgauwaUid::Off => "off".fmt(f),
+            EmgauwaUid::Any(value) => value.fmt(f),
+        }
+    }
+}
+
+impl ToSql<Binary, Sqlite> for EmgauwaUid {
+    fn to_sql<W: Write>(&self, out: &mut Output<W, Sqlite>) -> serialize::Result {
+        match self {
+            EmgauwaUid::On => out.write_all(&[1])?,
+            EmgauwaUid::Off => out.write_all(&[0])?,
+            EmgauwaUid::Any(_) => out.write_all(Uuid::from(self).as_bytes())?,
+        }
+        Ok(IsNull::No)
+    }
+}
+
+impl FromSql<Binary, Sqlite> for EmgauwaUid {
+    fn from_sql(bytes: Option<&<Sqlite as Backend>::RawValue>) -> deserialize::Result<Self> {
+        match bytes {
+            None => Ok(EmgauwaUid::default()),
+            Some(value) => match value.read_blob() {
+                [0] => Ok(EmgauwaUid::Off),
+                [1] => Ok(EmgauwaUid::On),
+                value_bytes => Ok(EmgauwaUid::Any(Uuid::from_slice(value_bytes).unwrap())),
+            },
+        }
+    }
+}
+
+impl Serialize for EmgauwaUid {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        String::from(self).serialize(serializer)
+    }
+}
+
+impl From<Uuid> for EmgauwaUid {
+    fn from(uid: Uuid) -> EmgauwaUid {
+        match uid.as_u128() {
+            0 => EmgauwaUid::Off,
+            1 => EmgauwaUid::On,
+            _ => EmgauwaUid::Any(uid),
+        }
+    }
+}
+
+impl From<&EmgauwaUid> for Uuid {
+    fn from(emgauwa_uid: &EmgauwaUid) -> Uuid {
+        match emgauwa_uid {
+            EmgauwaUid::On => uuid::Uuid::from_u128(1),
+            EmgauwaUid::Off => uuid::Uuid::from_u128(0),
+            EmgauwaUid::Any(value) => *value,
+        }
+    }
+}
+
+impl From<&EmgauwaUid> for String {
+    fn from(emgauwa_uid: &EmgauwaUid) -> String {
+        match emgauwa_uid {
+            EmgauwaUid::Off => String::from("off"),
+            EmgauwaUid::On => String::from("on"),
+            EmgauwaUid::Any(value) => value.to_hyphenated().to_string(),
+        }
+    }
+}