add update method #21

example/test.js

@@ -3,7 +3,7 @@ const fs = require('fs')
 
 
 //tags.image is the path to the image (only png/jpeg files allowed)
-const tags = {
+/*const tags = {
   title: "Tomorrow",
   artist: "Kevin Penkin",
   album: "TVアニメ「メイドインアビス」オリジナルサウンドトラック",
@@ -14,12 +14,12 @@ const tags = {
     text: "some text"
   },
   TRCK: "27"
-}
+}*/
 
 //let success = nodeID3.write(tags, "./example/Kevin Penkin - Tomorrow.mp3");
 //console.log(success);
 
-console.log(nodeID3.read("./example/Kevin Penkin - Tomorrow.mp3"))
+//console.log(nodeID3.read("./example/Kevin Penkin - Tomorrow.mp3"))
 
 //async
 
@@ -46,4 +46,15 @@ nodeID3.read("./example/Kevin Penkin - Tomorrow.mp3", function(err, tags) {
   })
   
 })
-*/
+*/
+
+console.log(nodeID3.update({
+  title: "TomorrowUP",
+  TRCK: "28",
+  image: "./example/mia_cover.jpg",
+  COMM: {
+    language: "eng",
+    text: "some text2"
+  },
+  genre: "testUP"
+}, "./example/Kevin Penkin - Tomorrow.mp3"));

index.js

@@ -216,6 +216,58 @@ NodeID3.prototype.read = function(filebuffer, options, fn) {
     }
 }
 
+/*
+**  Update ID3-Tags from passed buffer/filepath
+**  filebuffer  => Buffer || String
+**  tags        => Object
+**  fn          => function (for asynchronous usage)
+*/
+NodeID3.prototype.update = function(tags, filebuffer, fn) {
+    let rawTags = {}
+    Object.keys(tags).map(function(tagKey) {
+        //  if js name passed (TF)
+        if(TFrames[tagKey]) {
+            rawTags[TFrames[tagKey]] = tags[tagKey]
+
+        //  if js name passed (SF)
+        } else if(SFrames[tagKey]) {
+            rawTags[SFrames[tagKey].name] = tags[tagKey]
+
+        //  if raw name passed (TF)
+        } else if(Object.keys(TFrames).map(i => TFrames[i]).indexOf(tagKey) !== -1) {
+            rawTags[tagKey] = tags[tagKey]
+
+        //  if raw name passed (SF)
+        } else if(Object.keys(SFrames).map(i => SFrames[i]).map(x => x.name).indexOf(tagKey) !== -1) {
+            rawTags[tagKey] = tags[tagKey]
+        }
+    })
+    if(!fn || typeof fn !== 'function') {
+        let currentTags = this.read(filebuffer)
+        currentTags = currentTags.raw
+        //  update current tags with new or keep them
+        Object.keys(rawTags).map(function(tag) {
+            currentTags[tag] = rawTags[tag]
+        })
+        return this.write(currentTags, filebuffer)
+    } else {
+        this.read(filebuffer, function(err, currentTags) {
+            if(err) {
+                fn(err)
+                return
+            }
+            currentTags = currentTags.raw
+            //  update current tags with new or keep them
+            Object.keys(currentTags).map(function(tag) {
+                if(rawTags[tag]) {
+                    currentTags[tag] = rawTags[tag]
+                }
+            })
+            this.write(currentTags, filebuffer, fn)
+        }.bind(this))
+    }
+}
+
 /*
 **  Read ID3-Tags from passed buffer
 **  filebuffer  => Buffer