tonykwok

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software

tonykwok

Run the following in the terminal:

Install the gcc-7 packages:

sudo apt-get install -y software-properties-common
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt update
sudo apt install g++-7 -y

Set it up so the symbolic links gcc, g++ point to the newer version:

tonykwok

// NOTE: only escapes a " if it's not already escaped
function escapeDoubleQuotes(str) {
	return str.replace(/\\([\s\S])|(")/g,"\\$1$2"); // thanks @slevithan!
}

escapeDoubleQuotes(`ab`);          // ab  =>  ab           (nothing escaped)
escapeDoubleQuotes(`a"b`);         // a"b  =>  a\"b
escapeDoubleQuotes(`a\\"b`);       // a\"b  =>  a\"b       (nothing escaped)
escapeDoubleQuotes(`a\\\\"b`);     // a\\"b  =>  a\\\"b
escapeDoubleQuotes(`a\\\\\\"b`);   // a\\\"b  =>  a\\\"b   (nothing escaped)

tonykwok

import io
import selectors
import subprocess
import sys

def capture_subprocess_output(subprocess_args):
    # Start subprocess
    # bufsize = 1 means output is line buffered
    # universal_newlines = True is required for line buffering
    process = subprocess.Popen(subprocess_args,

tonykwok

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import asyncio
import signal


def my_handler():
    print('Stopping')
    for task in asyncio.Task.all_tasks():
        task.cancel()

tonykwok

import shlex
import subprocess
import sys

def run_cmd(cmd, callback=None, watch=False):
    """Runs the given command and gathers the output.

    If a callback is provided, then the output is sent to it, otherwise it
    is just returned.

tonykwok

#!/usr/bin/env python3

'''
A script to recursively compare two directories (including file size and file hash changes)
Usage: python3 compare_dirs.py DIR1 DIR2
'''

import os, sys, hashlib

COMPARE_FILES = True            # should file sizes be compared if their names are the same?

tonykwok

I recently came across the need to spawn multiple threads, each of which needs to write to the same file. Since the file will experience contention from multiple resources, we need to guarantee thread-safety.

NOTE: The following examples work with Python 3.x. To execute the following programs using Python 2.7, please replace threading.get_ident() with thread.get_ident(). As a result, you would need to import thread and not threading.

1. (The following example will take a very long time). It will create 200 threads, each of which will wait until a global lock is available for acquisition.

# threading_lock.py
import threading

tonykwok

#!/bin/bash

# This is a wrapper for adb.  If there are multiple devices / emulators, this script will prompt for which device to use
# Then it'll pass whatever commands to that specific device or emulator.

# Run adb devices once, in event adb hasn't been started yet
BLAH=$(adb devices)

# Grab the IDs of all the connected devices / emulators
IDS=($(adb devices | sed '1,1d' | sed '$d' | cut -f 1 | sort))

tonykwok

# This is a general-purpose function to ask Yes/No questions in Bash, either
# with or without a default answer. It keeps repeating the question until it
# gets a valid answer.

ask() {
    # https://djm.me/ask
    local prompt default reply

    while true; do