Expose theme_from_str_hash to SQL.

To be used in a db migration for storing the previously implicit value

src/db.rs

@@ -5,6 +5,7 @@ use r2d2::{CustomizeConnection, Pool};
 use r2d2_diesel::{self, ConnectionManager};
 
 use rendering;
+use theme;
 
 embed_migrations!();
 
@@ -15,6 +16,7 @@ struct SqliteInitializer;
 mod sqlfunc {
     use diesel::sql_types::Text;
     sql_function!(fn markdown_to_fts(text: Text) -> Text);
+    sql_function!(fn theme_from_str_hash(text: Text) -> Text);
 }
 
 impl CustomizeConnection<SqliteConnection, r2d2_diesel::Error> for SqliteInitializer {
@@ -28,6 +30,11 @@ impl CustomizeConnection<SqliteConnection, r2d2_diesel::Error> for SqliteInitial
             |text: String| rendering::render_markdown_for_fts(&text)
         ).map_err(|x| r2d2_diesel::Error::QueryError(x))?;
 
+        sqlfunc::theme_from_str_hash::register_impl(
+            conn,
+            |title: String| theme::theme_from_str_hash(&title)
+        ).map_err(|x| r2d2_diesel::Error::QueryError(x))?;
+
         Ok(())
     }
 }
@@ -53,3 +60,42 @@ pub fn test_connection() -> SqliteConnection {
 
     conn
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    use diesel::sql_query;
+
+    #[test]
+    fn markdown_to_fts() {
+        let conn = test_connection();
+
+        #[derive(QueryableByName, PartialEq, Eq, Debug)]
+        struct Row { #[sql_type = "Text"] text: String }
+
+        let res = sql_query("SELECT markdown_to_fts('[link](url)') as text")
+            .load::<Row>(&conn)
+            .unwrap();
+
+        let expected = rendering::render_markdown_for_fts("[link](url)");
+
+        assert_eq!(expected, res[0].text);
+    }
+
+    #[test]
+    fn theme_from_str_hash() {
+        let conn = test_connection();
+
+        #[derive(QueryableByName, PartialEq, Eq, Debug)]
+        struct Row { #[sql_type = "Text"] theme: theme::Theme }
+
+        let res = sql_query("SELECT theme_from_str_hash('Bartefjes') as theme")
+            .load::<Row>(&conn)
+            .unwrap();
+
+        let expected = theme::theme_from_str_hash("Bartefjes");
+
+        assert_eq!(expected, res[0].theme);
+    }
+}