Fix #47: Delete the correct item in playlist [wi]

Recording information, when an item was added to the playlist
makes it possible to remove the correct item in playlist, in case
duplicate items in playlist exists.

interface.py

@@ -3,6 +3,7 @@
 from flask import Flask, render_template, request, redirect, send_file
 import variables as var
 import util
+from datetime import datetime
 import os.path
 from os import listdir
 import random
@@ -68,7 +69,7 @@ def index():
     if request.method == 'POST':
         print(request.form)
         if 'add_file' in request.form and ".." not in request.form['add_file']:
-            item = ('file', request.form['add_file'])
+            item = ('file', request.form['add_file'], datetime.now())
             var.playlist.append(item)
         if ('add_folder' in request.form and ".." not in request.form['add_folder']) or ('add_folder_recursively' in request.form and ".." not in request.form['add_folder_recursively']) :
             try:
@@ -84,7 +85,7 @@ def index():
                 files = music_library.get_files_recursively(folder)
             else:
                 files = music_library.get_files(folder)
-            files = list(map(lambda file: ('file', folder + '/' + file), files))
+            files = list(map(lambda file: ('file', folder + '/' + file, datetime.now()), files))
             print('Adding to playlist: ', files)
             var.playlist.extend(files)
         elif 'delete_music' in request.form:

templates/index.html

@@ -84,7 +84,7 @@
 
     <ul>
         {% for m in playlist %}
-        <li>{{ m }}
+        <li>{{ m[0], m[1] }}
             <form method="post"><input type="text" value="{{ m }}" name="delete_music" hidden><input type="submit" value="X"></form>
         </li>
         {% endfor %}