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brew tap homebrew/versoins
brew install FORMULA # here is maven30\maven31\maven2 etc...
brew unlink maven2 # suppose that maven2 (version 2.2.1) is installed previously
brew link maven30 # now maven30 (version 3.0.x) will substitute maven2
# to revert this process, no need to reinstall maven2. just
brew unlink maven30
brew link maven2

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1. TO run a spring shell project in IDEA
[edit configurations]->add Application->specify [Main class] as "org.springframework.shell.Bootstrap"

2. TO run a spring shell project with maven (exec-maven-plugin)
$ cd path/to/projectRoot (where pom.xml exists)
$ mvn exec:java -Dexec.mainClass="org.springframework.shell.Bootstrap"

reference:
http://docs.spring.io/spring-shell/docs/current/reference/htmlsingle/#d4e260

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set -ex

[ "$ACTION" = build ] || exit 0
[ "$BUILD_VARIANTS" = "normal" ] || exit 0
[ "$CONFIGURATION" = "Release" ] || exit 0

dir="$TEMP_FILES_DIR/disk"
dmg="$HOME/Desktop/$PROJECT_NAME.dmg"

rm -rf "$dir"

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1. Download the latest AndroidStudios(AS)
2. Install Genymotion simultor.
3. Download 'gradle-2.2.1-all.zip',and unzip into 'GRADLE_PATH=gradle-2.2.1-all'
4. In AS, search 'Global Gradle settings. Unselect 'offline work', 
select 'use local gradle distribution', and specify 'Gradle home' to the GRADLE_PATH directory.
5. Download 'android-sdk_r24.3.3-macosx.zip' and unzip into 'ANDROID_SDK_PATH=android-sdk-macosx'
6. In AS, search 'Android SDK',and specify 'Android SDK Location' to the ANDROID_SDK_PATH directory.

references:

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#Intro

Kotlin is a new programming language for the JVM. It produces Java bytecode, supports Android and generates JavaScript. The latest version of the language is Kotlin M5.3

Kotlin project website is at kotlin.jetbrains.org.

All the codes here can be copied and run on Kotlin online editor.

Let's get started.

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from django.contrib import admin
from polls.models import Poll, Choice

from django.contrib.auth.models import User

from django.contrib.admin import AdminSite

from polls.views import index

class MyAdminSite(AdminSite):

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# Read more at http://www.pindi.us/blog/migrating-cross-domain-cookies-django

from django.conf import settings
from importlib import import_module

class UpdateSessionCookieMiddleware(object):
    """
        Migrates session data from an old (hardcoded) session cookie name and domain to the name and
        domain currently defined in the Django settings.
        

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task dependencyReport {
	doLast {
		def file = new File("project-dependencies.dot")
		file.delete()
		file << "digraph {\n"
		file << "splines=ortho\n"
		allprojects.each { item ->
			def from = item
			from.configurations.compile.dependencies
					.matching { it in ProjectDependency }

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Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

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import pygame

pygame.init()
text = "庞中华"
font = pygame.font.Font("/path/to/庞中华行书.ttf", 25)
rtext = font.render(text, True, (0, 0, 0), (255, 255, 255))
pygame.image.save(rtext, "t.gif")