Papierkorb

/* Compile: $ g++ -std=c++11 -o amd64 amd64.cpp */

#include <cstdio>
#include <cstdlib>
#include <cstdint>
#include <cstring>
#include <sys/mman.h>

// Helper enums so we don't have to poke in bytes directly.
// You can find the documentation of all of these in the *free* AMD64 specification:

Papierkorb

# This code is meant for debugging purposes.  Its performance is probably bad,
# it's just meant to work for some hacky scripts you throw out tomorrow :)
#   Create an instance of `Bitmap`, passing the file (IO or string), the width and height.
#   Then push one (or more) 32bit pixels in ARGB format using `Bitmap#<<`.
#   Pixel format is thus: 0xAARRGGBB (Alpha is highest byte, blue lowest).
#   (Alpha is ignored by most programs however)

class Bitmap
  MAGIC = "BM"
  

Papierkorb

class Boleite::InputReceiver
  def process(event : InputEvent)
    execute_all(@actions, event) unless event.claimed?
    execute_all(@persistent_actions, event)
  end

  private def execute_all(actions, event)
    actions.each{|act| act.execute(event) if act.interested?(event)}
  end
end

Papierkorb

waiter = Channel(Nil).new
var = "Hello"

spawn do
  waiter.receive
  var = 5
end

puts "var is a #{typeof(var)}"
puts "var right now is a #{var.class}"

Papierkorb

class Foo
  @stuff : String | Int32
  
  @waiter = Channel(Nil).new
  
  def initialize(@stuff)
    spawn do
      @waiter.receive # Simulate waiting for some IO
      @stuff = "Oh noes!" # And store the result of it
    end

Papierkorb

require "llvm"

# Initialize LLVM.  There's also `LLVM.init_arm` if that's what you use.
LLVM.init_x86

# The context of everything we'll do.  Main book-keeping structure.
ctx = LLVM::Context.new

# Code can be separated in different modules.  A module can't directly interact
# with another module.  If you'd do that, you'd have to link them.

Papierkorb

# Papierkorb suggestion
class Foo
  include CrystalClear
  
  requires var > 5 # Pushes "var > 5" into SOME_ARRAY
  ensures result.query? # Pushes "result.query?" into SOME_ARRAY
  contract def foo # Expands to the def, processes SOME_ARRAY, and clears it out for the next method
    # Code
  end

Papierkorb

Writing a dynamic library in Crystal, and calling it from C

• Download all files.
• Build the Crystal part:

crystal build --release --cross-compile --prelude ./no_main library.cr
              ^ You can leave this out
                        ^ We want to link ourselves!
 ^ Use our custom prelude!

Papierkorb

  # Requiring stuff from Crystals standard library
  require "macros"
  require "object"
  require "comparable"
  require "exception"
  require "iterable"
  require "iterator"
  require "indexable"
  require "primitives"

Papierkorb

#!/usr/bin/env ruby

# A script to bulk change file associations.  Intended for KDE, but might work
# with other XDG conforming software.  Run it without arguments to see how to
# use it.  Created by me out of frustration, so the code just works ;)

require "inifile" # gem install inifile

ASSOC_FILE = "#{ENV['HOME']}/.config/mimeapps.list"
ASSOC_FILE_BAK = "#{ASSOC_FILE}.bak"