Fix "tags" template (#539)

* fix tag templates for merge and group modes

* update version upgrade

* adjust upgrade replacement order

6 files changed, 52 insertions, 13 deletions

diff --git a/.eslintrc.json b/.eslintrc.json
index 3186a491..3e384524 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -98,6 +98,7 @@
                 "areSetsEqual": "readonly",
                 "getSetIntersection": "readonly",
                 "getSetDifference": "readonly",
+                "escapeRegExp": "readonly",
                 "EventDispatcher": "readonly",
                 "EventListenerCollection": "readonly",
                 "EXTENSION_IS_BROWSER_EDGE": "readonly"
diff --git a/ext/bg/data/default-anki-field-templates.handlebars b/ext/bg/data/default-anki-field-templates.handlebars
index 4382f707..42deae23 100644
--- a/ext/bg/data/default-anki-field-templates.handlebars
+++ b/ext/bg/data/default-anki-field-templates.handlebars
@@ -151,7 +151,7 @@
 {{/inline}}
 
 {{#*inline "tags"}}
-    {{~#each definition.definitionTags}}{{name}}{{#unless @last}}, {{/unless}}{{/each~}}
+    {{~#mergeTags definition group merge}}{{this}}{{/mergeTags~}}
 {{/inline}}
 
 {{#*inline "url"}}
@@ -166,4 +166,4 @@
     {{~context.document.title~}}
 {{/inline}}
 
-{{~> (lookup . "marker") ~}}
\ No newline at end of file
+{{~> (lookup . "marker") ~}}
diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index 557ceb29..20d31efc 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -150,7 +150,7 @@ class Backend {
             await profileConditionsDescriptorPromise;
 
             this.optionsSchema = await requestJson(chrome.runtime.getURL('/bg/data/options-schema.json'), 'GET');
-            this.defaultAnkiFieldTemplates = await requestText(chrome.runtime.getURL('/bg/data/default-anki-field-templates.handlebars'), 'GET');
+            this.defaultAnkiFieldTemplates = (await requestText(chrome.runtime.getURL('/bg/data/default-anki-field-templates.handlebars'), 'GET')).trim();
             this.options = await optionsLoad();
             this.options = JsonSchema.getValidValueOrDefault(this.optionsSchema, this.options);
 
diff --git a/ext/bg/js/handlebars.js b/ext/bg/js/handlebars.js
index 860acb14..822174e2 100644
--- a/ext/bg/js/handlebars.js
+++ b/ext/bg/js/handlebars.js
@@ -123,6 +123,26 @@ function handlebarsRegexMatch(...args) {
     return value;
 }
 
+function handlebarsMergeTags(object, isGroupMode, isMergeMode) {
+    const tagSources = [];
+    if (isGroupMode || isMergeMode) {
+        for (const definition of object.definitions) {
+            tagSources.push(definition.definitionTags);
+        }
+    } else {
+        tagSources.push(object.definitionTags);
+    }
+
+    const tags = new Set();
+    for (const tagSource of tagSources) {
+        for (const tag of tagSource) {
+            tags.add(tag.name);
+        }
+    }
+
+    return [...tags].join(', ');
+}
+
 function handlebarsRegisterHelpers() {
     if (Handlebars.partials !== Handlebars.templates) {
         Handlebars.partials = Handlebars.templates;
@@ -134,6 +154,7 @@ function handlebarsRegisterHelpers() {
         Handlebars.registerHelper('sanitizeCssClass', handlebarsSanitizeCssClass);
         Handlebars.registerHelper('regexReplace', handlebarsRegexReplace);
         Handlebars.registerHelper('regexMatch', handlebarsRegexMatch);
+        Handlebars.registerHelper('mergeTags', handlebarsMergeTags);
     }
 }
 
diff --git a/ext/bg/js/options.js b/ext/bg/js/options.js
index 10df033c..35fdde82 100644
--- a/ext/bg/js/options.js
+++ b/ext/bg/js/options.js
@@ -111,19 +111,31 @@ const profileOptionsVersionUpdates = [
     },
     (options) => {
         // Version 14 changes:
-        //  Changed template for Anki audio.
+        //  Changed template for Anki audio and tags.
         let fieldTemplates = options.anki.fieldTemplates;
         if (typeof fieldTemplates !== 'string') { return; }
 
-        const replacement = '{{#*inline "audio"}}\n    {{~#if definition.audioFileName~}}\n        [sound:{{definition.audioFileName}}]\n    {{~/if~}}\n{{/inline}}';
-        let replaced = false;
-        fieldTemplates = fieldTemplates.replace(/\{\{#\*inline "audio"\}\}\{\{\/inline\}\}/g, () => {
-            replaced = true;
-            return replacement;
-        });
-
-        if (!replaced) {
-            fieldTemplates += '\n\n' + replacement;
+        const replacements = [
+            [
+                '{{#*inline "audio"}}{{/inline}}',
+                '{{#*inline "audio"}}\n    {{~#if definition.audioFileName~}}\n        [sound:{{definition.audioFileName}}]\n    {{~/if~}}\n{{/inline}}'
+            ],
+            [
+                '{{#*inline "tags"}}\n    {{~#each definition.definitionTags}}{{name}}{{#unless @last}}, {{/unless}}{{/each~}}\n{{/inline}}',
+                '{{#*inline "tags"}}\n    {{~#mergeTags definition group merge}}{{this}}{{/mergeTags~}}\n{{/inline}}'
+            ]
+        ];
+
+        for (const [pattern, replacement] of replacements) {
+            let replaced = false;
+            fieldTemplates = fieldTemplates.replace(new RegExp(escapeRegExp(pattern), 'g'), () => {
+                replaced = true;
+                return replacement;
+            });
+
+            if (!replaced) {
+                fieldTemplates += '\n\n' + replacement;
+            }
         }
 
         options.anki.fieldTemplates = fieldTemplates;
diff --git a/ext/mixed/js/core.js b/ext/mixed/js/core.js
index 835d9cea..589425f2 100644
--- a/ext/mixed/js/core.js
+++ b/ext/mixed/js/core.js
@@ -94,6 +94,11 @@ function hasOwn(object, property) {
     return Object.prototype.hasOwnProperty.call(object, property);
 }
 
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
+function escapeRegExp(string) {
+    return string.replace(/[.*+\-?^${}()|[\]\\]/g, '\\$&');
+}
+
 // toIterable is required on Edge for cross-window origin objects.
 function toIterable(value) {
     if (typeof Symbol !== 'undefined' && typeof value[Symbol.iterator] !== 'undefined') {