1 files changed, 74 insertions, 0 deletions
diff --git a/frontend/src/gql/Utils.ts b/frontend/src/gql/Utils.ts
new file mode 100644
index 0000000..dd21bbe
--- /dev/null
+++ b/frontend/src/gql/Utils.ts
@@ -0,0 +1,74 @@
+import equal from 'fast-deep-equal';
+import * as gql from './graphql';
+
+export type OmitIdentifiers<T> = Omit<T, 'id' | '__typename'>;
+export type RequiredName<T> = T & { name: string };
+
+export function isSuccess(object: any): object is gql.Success {
+	if (object.__typename === undefined) {
+		return false;
+	}
+
+	return object.__typename.endsWith('Success') && (object as gql.Success).message !== undefined;
+}
+
+export function isError(object: any): object is gql.Error {
+	if (object.__typename === undefined) {
+		return false;
+	}
+	return object.__typename.endsWith('Error') && (object as gql.Error).message !== undefined;
+}
+
+type Item = {
+	id: number | string;
+	name: string;
+};
+
+export function itemEquals(a: Item, b: Item) {
+	return a.name == b.name;
+}
+
+function assocEquals(as: Item[], bs: Item[]) {
+	return equal(
+		as.map((a) => a.id),
+		bs.map((b) => b.id)
+	);
+}
+
+function stringEquals(a: string | null | undefined, b: string | null | undefined) {
+	return (a ? a : null) == (b ? b : null);
+}
+
+export function tagEquals(a: gql.FullTag, b: gql.FullTag) {
+	return (
+		itemEquals(a, b) &&
+		stringEquals(a.description, b.description) &&
+		assocEquals(a.namespaces, b.namespaces)
+	);
+}
+
+export function comicEquals(
+	a: gql.FullComicFragment | undefined,
+	b: gql.FullComicFragment | undefined
+) {
+	if (a === undefined) return b === undefined;
+	if (b === undefined) return a === undefined;
+
+	return (
+		stringEquals(a.title, b.title) &&
+		stringEquals(a.originalTitle, b.originalTitle) &&
+		stringEquals(a.url, b.url) &&
+		stringEquals(a.date, b.date) &&
+		a.category == b.category &&
+		a.rating == b.rating &&
+		a.censorship == b.censorship &&
+		a.language == b.language &&
+		a.direction == b.direction &&
+		a.layout == b.layout &&
+		assocEquals(a.artists, b.artists) &&
+		assocEquals(a.circles, b.circles) &&
+		assocEquals(a.characters, b.characters) &&
+		assocEquals(a.tags, b.tags) &&
+		assocEquals(a.worlds, b.worlds)
+	);
+}