Show emoji colored tags directly in items list

We can do fun things now.

Also:

- Make colored tag swatches resize with the font size
- Increase border radius for color swatches, and adjust with size

chrome/content/zotero/itemTree.jsx

@@ -41,6 +41,7 @@ const TYPING_TIMEOUT = 1000;
 const CHILD_INDENT = 12;
 const COLORED_TAGS_RE = new RegExp("^[0-" + Zotero.Tags.MAX_COLORED_TAGS + "]{1}$");
 const COLUMN_PREFS_FILEPATH = OS.Path.join(Zotero.Profile.dir, "treePrefs.json");
+const EMOJI_RE = /\p{Emoji_Modifier_Base}\p{Emoji_Modifier}?|\p{Emoji_Presentation}|\p{Emoji}\uFE0F/gu;
 
 function makeItemRenderer(itemTree) {
 	function renderPrimaryCell(index, data, column) {
@@ -76,7 +77,7 @@ function makeItemRenderer(itemTree) {
 			retracted.classList.add("retracted");
 		}
 		
-		let tags = item.getTagColors().map(color => itemTree._getTagSwatch(color));
+		let tags = item.getColoredTags().map(x => itemTree._getTagSwatch(x.tag, x.color));
 
 		let textSpan = document.createElementNS("http://www.w3.org/1999/xhtml", 'span');
 		textSpan.className = "cell-text";
@@ -3511,10 +3512,25 @@ var ItemTree = class ItemTree extends LibraryTree {
 		return icon;
 	}
 	
-	_getTagSwatch(color) {
+	_isOnlyEmoji(str) {
+		// Remove emoji and zero-width joiner and see if anything's left
+		return !str.replace(EMOJI_RE, '').replace(/\u200D/g,'');
+	}
+	
+	_getTagSwatch(tag, color) {
 		let span = document.createElementNS("http://www.w3.org/1999/xhtml", 'span');
 		span.className = 'tag-swatch';
+		// If only emoji, display directly
+		//
+		// TODO: Check for a maximum number of graphemes, which is hard to do
+		// https://stackoverflow.com/a/54369605
+		if (this._isOnlyEmoji(tag)) {
+			span.textContent = tag;
+		}
+		// Otherwise display color
+		else {
 			span.style.backgroundColor = color;
+		}
 		return span;
 	}
 };

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

@@ -4254,6 +4254,17 @@ Zotero.Item.prototype.getImageSrc = function() {
 
 
 Zotero.Item.prototype.getTagColors = function () {
+	Zotero.warn("Zotero.Item::getTagColors() is deprecated -- use Zotero.Item::getColoredTags()");
+	return this.getColoredTags().map(x => x.color);
+};
+
+
+/**
+ * Return tags and colors
+ *
+ * @return {Object[]} - Array of object with 'tag' and 'color' properties
+ */
+Zotero.Item.prototype.getColoredTags = function () {
 	var tags = this.getTags();
 	if (!tags.length) return [];
 	
@@ -4262,14 +4273,13 @@ Zotero.Item.prototype.getTagColors = function () {
 	for (let tag of tags) {
 		let data = tagColors.get(tag.tag);
 		if (data) {
-			colorData.push(data);
+			colorData.push({tag: tag.tag, ...data});
 		}
 	}
-	return colorData.sort((a, b) => a.position - b.position).map(val => val.color);
+	return colorData.sort((a, b) => a.position - b.position).map(x => ({ tag: x.tag, color: x.color }));
 };
 
 
-
 /**
  * Compares this item to another
  *

scss/components/_item-tree.scss

@@ -19,10 +19,10 @@
 
 	.tag-swatch {
 	  display: inline-block;
-	  min-width: 8px;
-	  min-height: 8px;
+	  min-width: .728em;
+	  min-height: .728em;
 	  margin-inline-start: 3px;
-	  border-radius: 1px;
+	  border-radius: .15em;
 	}
   }