3 files changed, 32 insertions, 1 deletions
diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index e97f32b5..027cc250 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -98,6 +98,10 @@ class Backend {
         }
 
         this.anki = options.anki.enable ? new AnkiConnect(options.anki.server) : new AnkiNull();
+
+        if (options.parsing.enableMecabParser) {
+            this.mecab.startListener();
+        }
     }
 
     async getFullOptions() {
diff --git a/ext/bg/js/mecab.js b/ext/bg/js/mecab.js
index fba9b2eb..4c62c2b0 100644
--- a/ext/bg/js/mecab.js
+++ b/ext/bg/js/mecab.js
@@ -19,16 +19,20 @@
 
 class Mecab {
     constructor() {
+        this.port = null;
         this.listeners = {};
         this.sequence = 0;
-        this.startListener();
     }
 
     async parseText(text) {
+        if (this.port === null) {
+            return {};
+        }
         return await this.invoke('parse_text', {text});
     }
 
     startListener() {
+        if (this.port !== null) { return; }
         this.port = chrome.runtime.connectNative('yomichan_mecab');
         this.port.onMessage.addListener((message) => {
             const {sequence, data} = message;
@@ -41,6 +45,14 @@ class Mecab {
         });
     }
 
+    stopListener() {
+        if (this.port === null) { return; }
+        this.port.disconnect();
+        this.port = null;
+        this.listeners = {};
+        this.sequence = 0;
+    }
+
     invoke(action, params) {
         return new Promise((resolve, reject) => {
             const sequence = this.sequence++;
diff --git a/ext/bg/js/settings.js b/ext/bg/js/settings.js
index f4fe032a..0013291a 100644
--- a/ext/bg/js/settings.js
+++ b/ext/bg/js/settings.js
@@ -154,6 +154,7 @@ async function formWrite(options) {
 
 function formSetupEventListeners() {
     $('input, select, textarea').not('.anki-model').not('.ignore-form-changes *').change(utilAsync(onFormOptionsChanged));
+    $('#parsing-mecab-enable').change(onParseMecabChanged);
     $('.anki-model').change(utilAsync(onAnkiModelChanged));
 }
 
@@ -441,6 +442,20 @@ function onMessage({action, params}, sender, callback) {
 
 
 /*
+ * Text parsing
+ */
+
+function onParseMecabChanged(e) {
+    const mecab = utilBackend().mecab;
+    if (e.target.checked) {
+        mecab.startListener();
+    } else {
+        mecab.stopListener();
+    }
+}
+
+
+/*
  * Anki
  */