Fix typo and add --list option

The -l / --list option will now display the name and index of all available input devices.

mycroft/util/audio_test.py

@@ -14,6 +14,7 @@
 #
 import argparse
 import os
+import pyaudio
 from contextlib import contextmanager
 
 from speech_recognition import Recognizer
@@ -79,18 +80,33 @@ def main():
     parser.add_argument(
         '-v', '--verbose', dest='verbose', action='store_true', default=False,
         help="Add extra output regarding the recording")
+    parser.add_argument(
+        '-l', '--list', dest='show_devices', action='store_true',
+        default=False, help="List all availabile input devices")
     args = parser.parse_args()
 
+    if args.show_devices:
+        print(" Initializing... ")
+        pa = pyaudio.PyAudio()
+
+        print(" ====================== Audio Devices ======================")
+        print("  Index    Device Name")
+        for device_index in range(pa.get_device_count()):
+            dev = pa.get_device_info_by_index(device_index)
+            if dev['maxInputChannels'] > 0:
+                print('   {}:       {}'.format(device_index, dev['name']))
+        print()
+
     config = Configuration.get()
     if "device_name" in config["listener"]:
         dev = config["listener"]["device_name"]
-    elif "device_index" in config["listenter"]:
+    elif "device_index" in config["listener"]:
         dev = "Device at index {}".format(config["listener"]["device_index"])
     else:
         dev = "Default device"
     samplerate = config["listener"]["sample_rate"]
     play_cmd = config["play_wav_cmdline"].replace("%1", "WAV_FILE")
-    print(" ============================= Info ==============================")
+    print(" ========================== Info ===========================")
     print(" Input device: {} @ Sample rate: {} Hz".format(dev, samplerate))
     print(" Playback commandline: {}".format(play_cmd))
     print()