View android logcat for react-native. Support multi device connected.

logcatRN.py

#!/usr/bin/env python
# coding:utf-8
# This script is aimed to grep logs for React-Native.

import os
import sys

def getDeviceId():
    devices = []
    command = "adb devices -l | sed '1d'| awk '{print $1}'"
    result = os.popen(command)
    deviceId = result.readline().strip()
    if deviceId != "":
        devices.append(deviceId)

    while (deviceId != ""):
        deviceId = result.readline().strip()
        if deviceId != "":
            devices.append(deviceId)
    return devices


def printRNLog(device):
    # print device, packageName
    print "Got device: " + device
    command = "adb -s %s logcat *:S ReactNative:V ReactNativeJS:V" % (device)
    os.system(command)


devices = getDeviceId()
devicesNum = len(devices)

if devicesNum < 1:
    print "Device not found."
elif devicesNum == 1:
    device = devices[0]
    printRNLog(device)
else:
    print "Please chose a dvice, input the index of the device:"
    for i in xrange(0, devicesNum):
        print str(i) + "\t" + devices[i]
    index = raw_input("")
    printRNLog(devices[int(index)])