work on audio

ext/bg/js/database.js

@@ -32,8 +32,7 @@ class Database {
             if (db.verno !== this.version) {
                 await db.delete();
             }
-        }
-        catch(error) {
+        } catch(e) {
             // NOP
         }
     }

ext/mixed/js/util.js

@@ -40,7 +40,7 @@ function clozeBuild(sentence, source) {
  * Audio
  */
 
-function audioBuildUrl(definition, mode, cache={}) {
+async function audioBuildUrl(definition, mode, cache={}) {
     if (mode === 'jpod101') {
         let kana = definition.reading;
         let kanji = definition.expression;
@@ -103,7 +103,7 @@ function audioBuildUrl(definition, mode, cache={}) {
             }
         });
     } else {
-        return Promise.reject('unsupported audio source');
+        return Promise.resolve();
     }
 }
 
@@ -121,16 +121,7 @@ function audioBuildFilename(definition) {
     }
 }
 
-function audioInject(definition, fields, mode) {
-    if (mode === 'disabled') {
-        return Promise.resolve(true);
-    }
-
-    const filename = audioBuildFilename(definition);
-    if (!filename) {
-        return Promise.resolve(true);
-    }
-
+async function audioInject(definition, fields, mode) {
     let usesAudio = false;
     for (const name in fields) {
         if (fields[name].includes('{audio}')) {
@@ -140,11 +131,19 @@ function audioInject(definition, fields, mode) {
     }
 
     if (!usesAudio) {
-        return Promise.resolve(true);
+        return true;
     }
 
-    return audioBuildUrl(definition, mode).then(url => {
+    try {
+        const url = await audioBuildUrl(definition, mode);
+        const filename = audioBuildFilename(definition);
+
+        if (url && filename) {
             definition.audio = {url, filename};
-        return true;
-    }).catch(() => false);
+        }
+
+        return true;
+    } catch (e) {
+        return false;
+    }
 }