1 files changed, 76 insertions, 0 deletions
diff --git a/frontend/src/lib/Form.ts b/frontend/src/lib/Form.ts
new file mode 100644
index 0000000..ab0f4f7
--- /dev/null
+++ b/frontend/src/lib/Form.ts
@@ -0,0 +1,76 @@
+import type { FullComicFragment, FullTag, Namespace } from '$gql/graphql';
+import type { OmitIdentifiers } from '$gql/Utils';
+import equal from 'fast-deep-equal';
+import type { Snippet } from 'svelte';
+
+export interface FormProps<I, P> {
+	initial: OmitIdentifiers<I>;
+	submit: (input: P) => void;
+	children?: Snippet;
+}
+
+interface Item {
+	id: number | string;
+	name: string;
+}
+
+function stringPending(a?: string | null, b?: string | null) {
+	if (a?.length === 0) {
+		a = null;
+	}
+
+	if (b?.length === 0) {
+		b = null;
+	}
+
+	return a !== b;
+}
+
+function associationPending(as: Item[], bs: Item[]) {
+	return !equal(
+		as.map((a) => a.id),
+		bs.map((b) => b.id)
+	);
+}
+
+export function itemPending(initial: OmitIdentifiers<Item>, current: OmitIdentifiers<Item>) {
+	return stringPending(initial.name, current.name);
+}
+
+export function namespacePending(
+	initial: OmitIdentifiers<Namespace>,
+	current: OmitIdentifiers<Namespace>
+) {
+	return itemPending(initial, current) || stringPending(initial.sortName, current.sortName);
+}
+
+export function tagPending(a: OmitIdentifiers<FullTag>, b: OmitIdentifiers<FullTag>) {
+	return (
+		itemPending(a, b) ||
+		stringPending(a.description, b.description) ||
+		associationPending(a.namespaces, b.namespaces)
+	);
+}
+
+export function comicPending(a?: FullComicFragment, b?: OmitIdentifiers<FullComicFragment>) {
+	if (a === undefined) return b === undefined;
+	if (b === undefined) return a === undefined;
+
+	return (
+		stringPending(a.title, b.title) ||
+		stringPending(a.originalTitle, b.originalTitle) ||
+		stringPending(a.url, b.url) ||
+		stringPending(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 ||
+		associationPending(a.artists, b.artists) ||
+		associationPending(a.circles, b.circles) ||
+		associationPending(a.characters, b.characters) ||
+		associationPending(a.tags, b.tags) ||
+		associationPending(a.worlds, b.worlds)
+	);
+}