Myron's Dev Notes

Rails

Docs

Kernel

Open

open("testfile") do |f|
  print f.gets
end
# pipe
cmd = open("|date")
print cmd.gets
cmd.close

Unbuffered output

$stdout.sync = true
$stderr.sync = true

Add this comment to top of ruby file.

encoding: utf-8

ENV_JAVA['file.encoding']
export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8
export LANGUAGE=en_US.UTF-8
JAVA_OPTS=-Dfile.encoding=UTF-8

# look these up
:startdoc:
:stopdoc:
:nodoc:

Comment out blocks with =begin and =end at start of line

#!/usr/bin/env ruby
=begin
Every body mentioned this way
to have multiline comments.

The =begin and =end must be at the beginning of the line or
it will be a syntax error.
=end

puts "Hello world!"

<<-DOC
Also, you could create a docstring.
which...
DOC

puts "Hello world!"

"..is kinda ugly and creates
a String instance, but I know one guy
with a Smalltalk background, who
does this."

puts "Hello world!"

##
# most
# people
# do
# this

# read data from __END__ with DATA.each_line
__END__

But all forgot there is another option.
Only at the end of a file, of course.

Install debugger for RubyMine

gem install debase --version '0.2.2.beta10'
gem install ruby-debug-ide --version '0.6.1.beta9'

Disable docs on gem install

begin
  Whatever.you.want
rescue => e
  puts e.message
  puts
  # filter gems and fix path
  puts e.backtrace.grep_v(/\/gems\//).map { |l|
    l.gsub(`pwd`.strip + '/', '')
  }
  raise # always reraise
end

File

DIR_HOME = File.expand_path File.dirname __FILE__
DIR_LIB  = File.join(DIR_HOME, 'lib')
$LOAD_PATH.unshift DIR_LIB unless $LOAD_PATH.include? DIR_LIB

Use require_relative instead of adding to LOAD_PATH

require_relative 'lib/ServerlessOptions'

profiler

prof = []
prof << Time.now
prof << Time.now
prof << Time.now
prof[0..-2].zip(prof[1..-1]).each.with_index do |i,n|
    Rails.logger.info "%4d: %.6f" % [n, i[1] - i[0]]
end

pipe remove color escapes

cat or echo x |ruby -ne 'print $_.gsub(/\e\[[\d\;]*m/,"");'

Misc

puts URI.unescape get_user_policy( user_name:'jenkins.lambdas', policy_name:'jenkins-lambdas').policy_document

plumb the view

rr g controller hello_angular index

Random String

require 'securerandom'
SecureRandom.hex(32)

Version managers

Look here to find different implementations

Bundler

gem install bundler
bundle init # creates Gemfile for new project
bundle # install contents of Gemfile

# Add to top of scripts for auth bundle exec
#!/usr/bin/env ruby
require 'rubygems'
require 'bundler/setup'

% operator