Add ImageRun feature

src/patcher/relationship-manager.ts

@@ -0,0 +1,30 @@
+import { Element } from "xml-js";
+
+import { RelationshipType } from "@file/relationships/relationship/relationship";
+import { getFirstLevelElements } from "./util";
+
+const getIdFromRelationshipId = (relationshipId: string): number => parseInt(relationshipId.substring(3), 10);
+
+export const getNextRelationshipIndex = (relationships: Element): number => {
+    const relationshipElements = getFirstLevelElements(relationships, "Relationships");
+
+    return (
+        (relationshipElements
+            .map((e) => getIdFromRelationshipId(e.attributes?.Id?.toString() ?? ""))
+            .reduce((acc, curr) => Math.max(acc, curr), 0) ?? 0) + 1
+    );
+};
+
+export const appendRelationship = (relationships: Element, id: number, type: RelationshipType, target: string): void => {
+    const relationshipElements = getFirstLevelElements(relationships, "Relationships");
+    // eslint-disable-next-line functional/immutable-data
+    relationshipElements.push({
+        attributes: {
+            Id: `rId${id}`,
+            Type: type,
+            Target: target,
+        },
+        name: "Relationship",
+        type: "element",
+    });
+};