dteoh

Keybase proof

I hereby claim:

• I am dteoh on github.
• I am dteoh (https://keybase.io/dteoh) on keybase.
• I have a public key whose fingerprint is 981E AFFF 4AE6 5ED3 AC3E 401E 8498 2F30 A58D F5CB

To claim this, I am signing this object:

dteoh

users = User.arel_table
query = users.project(users[Arel.star])

dteoh

par2 is not just for checksumming and recovering Usenet binaries, you can use it for your backups as well.

In my case, I wanted to make sure my RAW and JPG files don't get corrupted by bitrot.

Generating the checksum:

$ cd /the/directory/where/files/are/kept
$ par2 c something.par2 *
$ shasum -a 256 * > shasum256.txt

dteoh

require 'digest'
key = 'the value to hash'
num = Digest::MD5.digest(key).unpack('L').first

dteoh

In Rails 5, the preferred base class for testing controllers is ActionDispatch::IntegrationTest.

If you have an API that receives parameters as JSON request bodies, here are some helper methods to facilitate testing:

class ActionDispatch::IntegrationTest
  def put_json(path, obj)
    put path, params: obj.to_json, headers: { 'CONTENT_TYPE' => 'application/json' }
  end

dteoh

In Rails 4.x, you could add extra test paths to rake test by overriding the Rake task like so:

Rake::Task['test:run'].clear

namespace :test do
  Rails::TestTask.new(:run) do |t|
    paths = ['test/**/*_test.rb']
    paths << 'engines/foo_engine/test/**/*_test.rb'

dteoh

There is a built-in command line utility caffeinate that can be used to prevent macOS from sleeping.

To prevent macOS from sleeping before a process with given PID exits:

$ caffeinate -w PID

To prevent macOS from sleeping for the next N seconds:

dteoh

(lldb) expression (void) rb_backtrace()
/Users/dteoh/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/puma-3.8.2/lib/puma/plugin/tmp_restart.rb:22: [BUG] pthread_cond_wait: Invalid argument (EINVAL)
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin16]

-- Crash Report log information --------------------------------------------
   See Crash Report log file under the one of following:
     * ~/Library/Logs/CrashReporter
     * /Library/Logs/CrashReporter
     * ~/Library/Logs/DiagnosticReports
     * /Library/Logs/DiagnosticReports

dteoh

[merge]
	tool = vimdiff

[mergetool]
	keepBackup = false
    
[mergetool "vimdiff"]
	cmd = nvim -d $LOCAL $REMOTE $MERGED -c '$wincmd w' -c 'wincmd J'

dteoh

A pattern for encoding records with bs-json

If you have a record type like:

type post = {
  title: string,
  body: string,
};