luislavena

$ pwd
/home/luis/code/_sandbox/testing-alpine

$ echo 'foo' > file.txt

$ ls
file.txt

$ cat file.txt
foo

luislavena

require "../src/beryl"

# This sample showcases how to use a separate action
class HelloRouter < Beryl::Router
  routing do
    get "/", HelloAction
  end
end

class HelloAction

luislavena

clang++-3.7 -c  -o src/llvm/ext/llvm_ext.o src/llvm/ext/llvm_ext.cc `/usr/bin/llvm-config-3.7 --cxxflags`
src/llvm/ext/llvm_ext.cc:122:27: error: no member named 'setSubprogram' in 'llvm::Function'
  unwrap<Function>(Func)->setSubprogram(Sub);
  ~~~~~~~~~~~~~~~~~~~~~~  ^
src/llvm/ext/llvm_ext.cc:214:100: error: too few arguments to function call, expected at least 2,
      have 1
  ...*CT = Dref->createSubroutineType(DITypeRefArray(unwrap<MDTuple>(ParameterTypes)));
           ~~~~~~~~~~~~~~~~~~~~~~~~~~                                                ^
/usr/lib/llvm-3.7/include/llvm/IR/DIBuilder.h:383:5: note: 'createSubroutineType' declared here
    DISubroutineType *createSubroutineType(DIFile *File,

luislavena

struct Wrapper(T)
  module Interface
    abstract def unwrap
  end

  include Interface

  def unwrap
    T
  end

luislavena

require "option_parser"

number = 0

parser = OptionParser.new do |op|
  op.on "-n N", "--number N", "Set the number" { |n| number = n.to_i }

  op.missing_option do |option|
    puts "Missing value for '#{option}'"
  end

luislavena

$ bin/crystal build --debug foo.cr
Using compiled compiler at .build/crystal

$ ./foo 
BOOM (Exception)
0x0000000000434c20: *baz:NoReturn at /home/luis/code/crystal-lang/crystal/foo.cr 10:3
0x0000000000434c06: ??? at /home/luis/code/crystal-lang/crystal/foo.cr 6:3
0x0000000000434bf6: ??? at /home/luis/code/crystal-lang/crystal/foo.cr 2:3
0x00000000004306e1: ??? at /home/luis/code/crystal-lang/crystal/src/signal.cr 129:1
0x0000000000434ad9: main at /home/luis/.cache/crystal/macro70478608.cr 12:15

luislavena

$ docker-machine create --driver virtualbox --virtualbox-cpu-count 2 --virtualbox-memory 2048 --virtualbox-hostonly-cidr "192.168.59.3/24" default

$ docker-machine ssh default
# add script (shown below) and reboot

$ docker-machine regenerate-certs default

luislavena

Crystal benchmark (nightly vs new-fibers)

This benchmark compares the performance of new fibers implementation vs current (PCL backed one).

• Code was compiled with --release flag
• Benchmarks were performed on same computer (localhost)

Benchmarks

luislavena

require "benchmark/ips"
require "granola"

require "json"
require "oj"
require "yajl"

require "multi_json"
require "multi_json/adapters/json_gem"
require "multi_json/adapters/oj"

luislavena

# place unit in /etc/systemd/system/[email protected]
# start and enable with `systemctl start|enable gpg-agent@username`
[Unit]
Description=GnuPG private key agent for %I
IgnoreOnIsolate=true

[Service]
User=%i
Type=forking
ExecStart=/usr/bin/gpg-agent --daemon --write-env-file "${HOME}/.gpg-agent-info"