Remove all colored tags on selected items if 0 is pressed

Like Thunderbird

chrome/content/zotero/xpcom/data/tags.js

@@ -757,6 +757,32 @@ Zotero.Tags = new function() {
 	};
 	
 	
+	/**
+	 * @param {Zotero.Item[]}
+	 * @return {Promise}
+	 */
+	this.removeColoredTagsFromItems = async function (items) {
+		return Zotero.DB.executeTransaction(async function () {
+			for (let item of items) {
+				let colors = this.getColors(item.libraryID);
+				let tags = item.getTags();
+				let changed = false;
+				for (let tag of tags) {
+					if (colors.has(tag.tag)) {
+						item.removeTag(tag.tag);
+						changed = true;
+					}
+				}
+				if (changed) {
+					await item.save({
+						skipDateModifiedUpdate: true
+					});
+				}
+			}
+		}.bind(this));
+	};
+	
+	
 	/**
 	 * A tree cell can show only one image, and (as of Fx19) it can't be an SVG,
 	 * so we need to generate a composite image containing the existing item type

chrome/content/zotero/xpcom/itemTreeView.js

@@ -148,7 +148,7 @@ Zotero.ItemTreeView.prototype.setTree = async function (treebox) {
 		// Add a keypress listener for expand/collapse
 		var tree = this._getTreeElement();
 		var self = this;
-		var coloredTagsRE = new RegExp("^[1-" + Zotero.Tags.MAX_COLORED_TAGS + "]{1}$");
+		var coloredTagsRE = new RegExp("^[0-" + Zotero.Tags.MAX_COLORED_TAGS + "]{1}$");
 		var listener = function(event) {
 			if (self._skipKeyPress) {
 				self._skipKeyPress = false;
@@ -199,6 +199,11 @@ Zotero.ItemTreeView.prototype.setTree = async function (treebox) {
 				if (coloredTagsRE.test(key)) {
 					let libraryID = self.collectionTreeRow.ref.libraryID;
 					let position = parseInt(key) - 1;
+					// When 0 is pressed, remove all colored tags
+					if (position == -1) {
+						let items = self.getSelectedItems();
+						return Zotero.Tags.removeColoredTagsFromItems(items);
+					}
 					let colorData = Zotero.Tags.getColorByPosition(libraryID, position);
 					// If a color isn't assigned to this number or any
 					// other numbers, allow key navigation

test/tests/tagsTest.js

@@ -198,4 +198,28 @@ describe("Zotero.Tags", function () {
 			assert.isNull(o);
 		});
 	});
+	
+	
+	describe("#removeColoredTagsFromItems()", function () {
+		it("shouldn't remove regular tags", async function () {
+			var libraryID = Zotero.Libraries.userLibraryID;
+			var item = await createDataObject('item', {
+				tags: [
+					{ tag: 'A' },
+					{ tag: 'B', type: 1 },
+					{ tag: 'C' },
+					{ tag: 'D', type: 1 }
+				]
+			});
+			await Zotero.Tags.setColor(libraryID, 'C', '#111111', 0);
+			await Zotero.Tags.setColor(libraryID, 'D', '#222222', 1);
+			
+			await Zotero.Tags.removeColoredTagsFromItems([item]);
+			
+			assert.sameDeepMembers(item.getTags(), [
+				{ tag: 'A' },
+				{ tag: 'B', type: 1 }
+			]);
+		});
+	});
 })