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How to use Bundler and RubyGems on WebAssembly

# Download prebuilt ruby
curl -LO https://github.com/ruby/ruby.wasm/releases/download/2022-05-11-a/ruby-head-wasm32-unknown-wasi-full.tar.gz
tar xfz ruby-head-wasm32-unknown-wasi-full.tar.gz

# Install the same version of native ruby to avoid bundler version mismatch in "BUNDLED WITH" of Gemfile.lock
rvm install 3.2.0-preview1
rvm use 3.2.0-preview1

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cask_args appdir: '/Applications'
tap 'homebrew/cask'
tap "homebrew/cask-fonts"
tap 'homebrew/cask-versions'
tap "homebrew/bundle"
tap "homebrew/core"
tap "homebrew/services"

brew "git"
brew "git-lfs"

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#import "NSString+UnicodeLength.h"

@implementation NSString (UnicodeLength)

/**
 * @param range a unicode codepoint range, as described in twitter
 * @return rante a NSRange for the string
 * @see https://dev.twitter.com/overview/api/counting-characters
 */
- (NSRange)composedRangeWithRange:(NSRange)range {

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require 'rubygems'
require 'em-proxy'
require 'http_tools'
require 'uuid'

# > ruby em-proxy-http.rb
# > curl --proxy localhost:8080 www.google.com

host = "0.0.0.0"
port = 8080

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framework 'Cocoa'

class NSColor 
  def toCGColor
    color_RGB = colorUsingColorSpaceName(NSCalibratedRGBColorSpace)
    ## approach #1
    # components = Array.new(4){Pointer.new(:double)}
    # color_RGB.getRed(components[0],
    #                 green: components[1],
    #                 blue: components[2],