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@josephzhang23
josephzhang23 / blockchain.swift
Created December 27, 2017 14:25
在 iOS 中实现区块链
import Cocoa
import Foundation
class Block {
var index: Int = 0
var dateCreated: String
var previousHash: String!
var hash: String!
var nonce: Int
@thelvis4
thelvis4 / select_xcode_signing_method.rb
Last active November 16, 2018 04:16
#!/usr/bin/ruby
require 'xcodeproj'
# ============================================
# !!! I've released a ruby gem that does the same thing, but better.
# You can install it by running `gem install xcprovisioner` or
# `sudo gem install xcprovisioner` if it asks for sudo rights.
#
# For more info: https://github.com/thelvis4/XCProvisioner
@travisnewby
travisnewby / CMDeviceMotion.swift
Last active March 10, 2025 01:56
Determine the direction of "gaze" of the device in any orientation
extension CMDeviceMotion {
func gaze(atOrientation orientation: UIInterfaceOrientation) -> SCNVector4 {
let attitude = self.attitude.quaternion
let aq = GLKQuaternionMake(Float(attitude.x), Float(attitude.y), Float(attitude.z), Float(attitude.w))
let final: SCNVector4
switch orientation {
@protrolium
protrolium / ffmpeg.md
Last active December 1, 2025 21:36
ffmpeg guide

ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

You can get the list of installed codecs with:

@schickling
schickling / Rakefile
Last active September 26, 2025 01:53
Activerecord without Rails
require "active_record"
namespace :db do
db_config = YAML::load(File.open('config/database.yml'))
db_config_admin = db_config.merge({'database' => 'postgres', 'schema_search_path' => 'public'})
desc "Create the database"
task :create do
ActiveRecord::Base.establish_connection(db_config_admin)
@gdavis
gdavis / gist:6670468
Last active November 9, 2024 08:57
Xcode Build Variables List. Adopted from: http://stackoverflow.com/questions/6910901/canonical-list-of-xcode-environment-variables
ACTION
AD_HOC_CODE_SIGNING_ALLOWED
ALTERNATE_GROUP
ALTERNATE_MODE
ALTERNATE_OWNER
ALWAYS_SEARCH_USER_PATHS
ALWAYS_USE_SEPARATE_HEADERMAPS
APPLE_INTERNAL_DEVELOPER_DIR
APPLE_INTERNAL_DIR
APPLE_INTERNAL_DOCUMENTATION_DIR
@jcasimir
jcasimir / render_and_redirect.markdown
Created September 11, 2011 21:29
Render and Redirect in Rails 3

Render and Redirect

The normal controller/view flow is to display a view template corresponding to the current controller action, but sometimes we want to change that. We use render in a controller when we want to respond within the current request, and redirect_to when we want to spawn a new request.

Render

The render method is very overloaded in Rails. Most developers encounter it within the view template, using render :partial => 'form' or render @post.comments, but here we'll focus on usage within the controller.

:action

@kmile
kmile / xml_parser.rb
Created February 15, 2011 12:53
A small nokogiri xml reader DSL.
# A small DSL for helping parsing documents using Nokogiri::XML::Reader. The
# XML Reader is a good way to move a cursor through a (large) XML document fast,
# but is not as cumbersome as writing a full SAX document handler. Read about
# it here: http://nokogiri.org/Nokogiri/XML/Reader.html
#
# Just pass the reader in this parser and specificy the nodes that you are interested
# in in a block. You can just parse every node or only look inside certain nodes.
#
# A small example:
#