Add option to Mendeley importer to relink items

New option only appears if importer version is < 1 or not present.
It will:
    * Skip fetching collections and attachments
    * Skip any new items
    * Update relations on existing items

chrome/content/zotero/fileInterface.js

@@ -450,6 +450,7 @@ var Zotero_File_Interface = new function() {
 			translation.mendeleyAuth = options.mendeleyAuth;
 			translation.mendeleyCode = options.mendeleyCode;
 			translation.newItemsOnly = options.newItemsOnly;
+			translation.relinkOnly = options.relinkOnly;
 		}
 		else {
 			// Check if the file is an SQLite database

chrome/content/zotero/import/importWizard.js

@@ -12,6 +12,7 @@ var Zotero_Import_Wizard = {
 	_mendeleyCode: null,
 	_mendeleyAuth: null,
 	_mendeleyHasPreviouslyImported: false,
+	_mendeleyImporterVersion: 0,
 	_isZotfileInstalled: false,
 	
 	init: async function () {
@@ -32,6 +33,8 @@ var Zotero_Import_Wizard = {
 			this._mendeleyHasPreviouslyImported = !!(await Zotero.DB.valueQueryAsync(relSQL, predicateID));
 		}
 
+		this._mendeleyImporterVersion = parseInt((await Zotero.DB.valueQueryAsync("SELECT value FROM settings WHERE setting='mendeleyImport' AND key='version'")) || 0);
+		
 		// If no existing collections or non-trash items in the library, don't create a new
 		// collection by default
 		var args = window.arguments[0].wrappedJSObject;
@@ -82,6 +85,8 @@ var Zotero_Import_Wizard = {
 		document.getElementById('mendeley-username').addEventListener('keyup', this.onMendeleyAuthKeyUp.bind(this));
 		document.getElementById('mendeley-password').addEventListener('keyup', this.onMendeleyAuthKeyUp.bind(this));
 		
+		document.getElementById('relink-only-checkbox').addEventListener('command', this.onRelinkOnlyChange.bind(this));
+		
 		Zotero.Translators.init(); // async
 	},
 
@@ -187,6 +192,16 @@ var Zotero_Import_Wizard = {
 			&& document.getElementById('mendeley-password').value.length > 0;
 	},
 
+	onRelinkOnlyChange: function () {
+		if (document.getElementById('relink-only-checkbox').checked) {
+			document.getElementById('new-items-only-checkbox').checked = true;
+			document.getElementById('create-collection-checkbox').checked = false;
+		}
+
+		document.getElementById('new-items-only-checkbox').disabled = document.getElementById('relink-only-checkbox').checked;
+		document.getElementById('create-collection-checkbox').disabled = document.getElementById('relink-only-checkbox').checked;
+	},
+	
 	goToStart: function () {
 		this._wizard.goTo('page-start');
 		this._wizard.canAdvance = true;
@@ -268,6 +283,7 @@ var Zotero_Import_Wizard = {
 		document.getElementById('file-handling-options').hidden = !!(this._mendeleyAuth || this._mendeleyCode);
 		const hideExtraMendeleyOptions = !this._mendeleyHasPreviouslyImported || !(this._mendeleyAuth || this._mendeleyCode);
 		document.getElementById('mendeley-options').hidden = hideExtraMendeleyOptions;
+		document.getElementById('relink-only-wrapper').hidden = hideExtraMendeleyOptions || this._mendeleyImporterVersion > 0;
 		if (hideExtraMendeleyOptions) {
 			document.getElementById('new-items-only-checkbox').removeAttribute('checked');
 		}
@@ -309,12 +325,12 @@ var Zotero_Import_Wizard = {
 			let result = await Zotero_File_Interface.importFile({
 				file: this._file,
 				onBeforeImport: this.onBeforeImport.bind(this),
-				addToLibraryRoot: !document.getElementById('create-collection-checkbox')
+				addToLibraryRoot: !document.getElementById('create-collection-checkbox').checked,
-					.hasAttribute('checked'),
 				linkFiles: document.getElementById('file-handling-radio').selectedIndex == 1,
 				mendeleyAuth: this._mendeleyAuth,
 				mendeleyCode: this._mendeleyCode,
-				newItemsOnly: document.getElementById('new-items-only-checkbox').hasAttribute('checked')
+				newItemsOnly: document.getElementById('new-items-only-checkbox').checked,
+				relinkOnly: document.getElementById('relink-only-checkbox').checked
 			});
 			
 			// Cancelled by user or due to error

chrome/content/zotero/import/importWizard.xul

@@ -78,6 +78,11 @@
 			onpageshow="Zotero_Import_Wizard.onOptionsShown()"
 			onpagerewound="return Zotero_Import_Wizard.goToStart()"
 			onpageadvanced="Zotero_Import_Wizard.onImportStart()">
+
+		<vbox id="relink-only-wrapper">
+			<checkbox id="relink-only-checkbox" label="&zotero.import.online.relinkOnly;" />
+		</vbox>
+
 		<checkbox id="create-collection-checkbox" label="&zotero.import.createCollection;" checked="true" />
 		
 		<vbox id="file-handling-options">

chrome/content/zotero/import/mendeley/mendeleyImport.js

@@ -32,6 +32,7 @@ var Zotero_Import_Mendeley = function () {
 	this.newCollections = [];
 	this.mendeleyAuth = null;
 	this.newItemsOnly = false;
+	this.relinkOnly = false;
 	
 	this._tokens = null;
 	this._db = null;
@@ -93,12 +94,14 @@ Zotero_Import_Mendeley.prototype.translate = async function (options = {}) {
 		...(options.saveOptions || {})
 	};
 
+	this.newItemsOnly = this.newItemsOnly || this.relinkOnly;
+	
 	const libraryID = options.libraryID || Zotero.Libraries.userLibraryID;
 	const { key: rootCollectionKey } = options.collections
 		? Zotero.Collections.getLibraryAndKeyFromID(options.collections[0])
 		: {};
 
-	Zotero.debug(`Begining Mendeley import at ${this._started}. libraryID: ${libraryID}, linkFiles: ${this.linkFiles}, rootCollectionKey: ${rootCollectionKey}`);
+	Zotero.debug(`Begining Mendeley import at ${this._started}. libraryID: ${libraryID}, linkFiles: ${this.linkFiles}, rootCollectionKey: ${rootCollectionKey}, newItemsOnly: ${this.newItemsOnly}, relinkOnly: ${this.relinkOnly}`);
 	
 	// TODO: Get appropriate version based on schema version
 	const mapVersion = 83;
@@ -135,14 +138,17 @@ Zotero_Import_Mendeley.prototype.translate = async function (options = {}) {
 		this._progressMax = 50;
 		this._itemDone();
 
-		const folders = this._tokens
+		let folderKeys = new Map();
-			? await this._getFoldersAPI(mendeleyGroupID)
+		if(!this.relinkOnly) {
-			: await this._getFoldersDB(mendeleyGroupID);
+			const folders = this._tokens
+				? await this._getFoldersAPI(mendeleyGroupID)
+				: await this._getFoldersDB(mendeleyGroupID);
 
-		const collectionJSON = this._foldersToAPIJSON(folders, rootCollectionKey);
+			const collectionJSON = this._foldersToAPIJSON(folders, rootCollectionKey);
-		const folderKeys = this._getFolderKeys(collectionJSON);
+			folderKeys = this._getFolderKeys(collectionJSON);
 
-		await this._saveCollections(libraryID, collectionJSON, folderKeys);
+			await this._saveCollections(libraryID, collectionJSON, folderKeys);
+		}
 		
 		this._interruptChecker(true);
 		//
@@ -175,13 +181,13 @@ Zotero_Import_Mendeley.prototype.translate = async function (options = {}) {
 
 		this._interruptChecker(true);
 
-		let collections = this._tokens
+		let collections = this.relinkOnly ? new Map() : this._tokens
 			? await this._getDocumentCollectionsAPI(documents, rootCollectionKey, folderKeys)
 			: await this._getDocumentCollectionsDB(mendeleyGroupID, documents, rootCollectionKey, folderKeys);
 
 		this._interruptChecker(true);
 
-		let files = this._tokens
+		let files = this.relinkOnly ? new Map() : this._tokens
 			? await this._getDocumentFilesAPI(documents)
 			: await this._getDocumentFilesDB(mendeleyGroupID);
 
@@ -1331,6 +1337,10 @@ Zotero_Import_Mendeley.prototype._saveItems = async function (libraryID, json) {
 			}
 		}
 
+		if(this.relinkOnly && !isMappedToExisting) {
+			continue;
+		}
+		
 		// Remove external id before save
 		let toSave = Object.assign({}, itemJSON);
 		delete toSave.documentID;

chrome/locale/en-US/zotero/zotero.dtd

@@ -187,6 +187,7 @@
 <!ENTITY zotero.import.createCollection                "Place imported collections and items into new collection">
 <!ENTITY zotero.import.fileHandling                    "File Handling">
 <!ENTITY zotero.import.online.newItemsOnly             "Download new items only; don’t update previously imported items">
+<!ENTITY zotero.import.online.relinkOnly               "Relink Mendeley Desktop citations">
 
 <!ENTITY zotero.exportOptions.title						"Export…">
 <!ENTITY zotero.exportOptions.format.label				"Format:">

chrome/skin/default/zotero/importWizard.css

@@ -122,3 +122,7 @@ button, checkbox {
 	color: red;
 	font-weight: bold;
 }
+
+[disabled="true"] .checkbox-label {
+	opacity: .5;
+}

test/tests/mendeleyImportTest.js

@@ -402,5 +402,56 @@ describe('Zotero_Import_Mendeley', function () {
 			assert.equal(report.getField('title'), 'Sample Report');
 			assert.equal(report.getRelations()['mendeleyDB:documentUUID'], '616ec6d1-8d23-4414-8b6e-7bb129677577');
 		});
+
+		it("should only correct IDs and not add new items if \"relinkOnly\" is configured", async () => {
+			setHTTPResponse(server, 'https://api.mendeley.com/', {
+				method: 'GET',
+				url: `documents?view=all&limit=500`,
+				status: 200,
+				headers: {},
+				json: JSON.parse(
+					await Zotero.File.getContentsFromURLAsync('resource://zotero-unit-tests/data/mendeleyMock/items-simple-no-desktop-id.json')
+				)
+			});
+			const importer1 = getImporter();
+			await importer1.translate({
+				libraryID: Zotero.Libraries.userLibraryID,
+				collections: null,
+				linkFiles: false,
+			});
+
+			const report = (await Zotero.Relations
+				.getByPredicateAndObject('item', 'mendeleyDB:remoteDocumentUUID', '07a74c26-28d1-4d9f-a60d-3f3bc5ef76ef'))
+				.filter(item => item.libraryID == Zotero.Libraries.userLibraryID && !item.deleted)
+				.shift();
+
+			assert.equal(report.getField('title'), 'Sample Report');
+			assert.equal(report.getRelations()['mendeleyDB:documentUUID'], '07a74c26-28d1-4d9f-a60d-3f3bc5ef76ef');
+			
+			setHTTPResponse(server, 'https://api.mendeley.com/', {
+				method: 'GET',
+				url: `documents?view=all&limit=500`,
+				status: 200,
+				headers: {},
+				json: JSON.parse(
+					await Zotero.File.getContentsFromURLAsync('resource://zotero-unit-tests/data/mendeleyMock/items-updated.json')
+				)
+			});
+
+			const importer2 = getImporter();
+			importer2.relinkOnly = true;
+			await importer2.translate({
+				libraryID: Zotero.Libraries.userLibraryID,
+				collections: null,
+				linkFiles: false,
+			});
+
+			assert.equal(report.getField('title'), 'Sample Report');
+			assert.equal(report.getRelations()['mendeleyDB:documentUUID'], '616ec6d1-8d23-4414-8b6e-7bb129677577');
+
+			const noNewItemHere = await Zotero.Relations.getByPredicateAndObject('item', 'mendeleyDB:documentUUID', '86e56a00-5ae5-4fe8-a977-9298a03b16d6');
+			assert.lengthOf(noNewItemHere, 0);
+
+		});
 	});
 });