Rework alias system

src/catalog.rs

@@ -0,0 +1,50 @@
+// (catalog_name, (username, password))
+pub type CatalogDefinition<'a> = (&'a str, Login<'a>);
+pub type Login<'a> = Option<(&'a str, &'a str)>;
+
+pub static ALIASES: &[(&str, CatalogDefinition)] = &[
+    ("DS_WS1617", ("16w-diskrete-strukturen", None)),
+    ("EIDI_WS1617", ("eidi1-2016", Some(("eidi-2016", "PGdP.16")))),
+    ("ERA_WS1617", ("era-2016", None)),
+
+    ("GAD_SS17", ("17s-grundlagen-algorithmen-und-datenstrukturen", None)),
+    ("LA_SS17", ("17s-lineare-algebra-fuer-informatik", None)),
+    // EIST is on a Nextcloud
+];
+
+pub static ALIAS_ALIASES: &[(&str, &str)] = &[
+    ("DS", "DS_WS1617"),
+    ("EIDI", "EIDI_WS1617"),
+    ("ERA", "ERA_WS1617"),
+
+    ("GAD", "GAD_SS17"),
+    ("LA", "LA_SS17"),
+];
+
+pub fn resolve_alias(mut query: &str) -> Option<CatalogDefinition> {
+    for &(alias_alias, alias) in ALIAS_ALIASES {
+        if query == alias_alias {
+            query = alias;
+        }
+    }
+
+    for &(alias_name, def) in ALIASES {
+        if query == alias_name {
+            return Some(def);
+        }
+    }
+
+    None
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn check_alias_aliases() {
+        for &(alias, _) in ALIAS_ALIASES {
+            assert!(resolve_alias(alias).is_some());
+        }
+    }
+}