jjb

def do_jobs
  begin
    while true
      # do interesting things
    end
  rescue NoMoreDiskSpace
    # tidy things up
  end
end

jjb

require 'timeout'

Timeout.timeout(rand) do # random number between 0 and 1 (seconds)
  sleep 0.1
  sleep 0.1
  sleep 0.1
  sleep 0.1
  sleep 0.1
  sleep 0.1
  sleep 0.1

jjb

#!/bin/env ruby

require 'rubygems'
require 'pony'

# total memory used
total_memory_used = `free | awk '$1=="Mem:" {print $3 / $2 * 100}'`.to_i

# active memory used
used = `awk '$1=="Active:"{active=$2}$1=="MemTotal:"{total=$2}END{print active/total * 100}' /proc/meminfo`.to_i

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2012-09-27 18:08:53.258 growlnotify[83684:707] Got disconnected: Error Domain=NSPOSIXErrorDomain Code=61 "Connection refused" UserInfo=0x7fb3e2a0f900 {NSLocalizedDescription=Connection refused, NSLocalizedFailureReason=Error in connect() function}
2012-09-27 18:08:53.260 growlnotify[83684:707] <GrowlGNTPRegistrationAttempt: 0x7fb3e2a0f770> failed because Error Domain=NSPOSIXErrorDomain Code=61 "Connection refused" UserInfo=0x7fb3e2a0f900 {NSLocalizedDescription=Connection refused, NSLocalizedFailureReason=Error in connect() function}
2012-09-27 18:08:53.260 growlnotify[83684:707] Failed to register with (null)

jjb

foo
bar
 

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# diff -c 1.txt 3.txt - lack of newline is announced in output
*** 1.txt	2012-11-03 23:24:05.000000000 -0400
--- 3.txt	2012-11-03 23:28:44.000000000 -0400
***************
*** 1,2 ****
! foo
  bar
\ No newline at end of file
--- 1,2 ----
! food

jjb

# diff -c 1.txt 2.txt
*** 1.txt	2012-11-03 23:24:05.000000000 -0400
--- 2.txt	2012-11-03 23:24:13.000000000 -0400
***************
*** 1,2 ****
  foo
! bar
\ No newline at end of file
--- 1,3 ----
  foo

jjb

function chpwd {
  if [ -r $PWD/Gemfile ]; then
    export PATH=./bin:${PATH//\.\/bin:}
  else
    regexp-replace PATH '\./bin:' ''
  fi
}

jjb

def my_method(arg1, arg2)
  unless Foo == arg1.class
    raise ArgumentError,
      "A Foo is expected for the first argument. An #{arg1.class} was given."
  end
  unless Bar == arg2.class
    raise ArgumentError,
      "A Bar is expected for the first argument. An #{arg2.class} was given."
  end

jjb

class Object
  def self.typecheck(object)
    unless self == object.class
      raise ArgumentError,
        "expected type: #{self}. given: #{object.class}."
    end
  end
end

class Foo; end