Class: Batch

Inherits:
Object
  • Object
show all
Defined in:
lib/batch.rb

Constant Summary collapse

VERSION = 
"0.0.3"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(enumerable) ⇒ Batch

Returns a new instance of Batch.



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# File 'lib/batch.rb', line 6

def initialize(enumerable)
  @enumerable = enumerable
  @width = (ENV["BATCH_WIDTH"] || 75).to_i
  @size = enumerable.size if enumerable.respond_to?(:size)
end

Instance Attribute Details

#enumerable ⇒ Object (readonly)

Returns the value of attribute enumerable.



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# File 'lib/batch.rb', line 4

def enumerable
  @enumerable
end

Class Method Details

.each(enumerable, &block) ⇒ Object 



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# File 'lib/batch.rb', line 84

def self.each(enumerable, &block)
  new(enumerable).each(&block)
end

.start(title, enumerable, &block) ⇒ Object 



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# File 'lib/batch.rb', line 88

def self.start(title, enumerable, &block)
  puts
  puts(title)
  puts
  each(enumerable, &block)
end

Instance Method Details

#each(&block) ⇒ Object 



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# File 'lib/batch.rb', line 12

def each(&block)
  @errors = []
  @current = 0

  report_progress

  enumerable.each do |item|
    begin
      yield(item)
      print "."

    rescue Interrupt => e
      raise e

    rescue Exception => e
      print "E"
      @errors << [item, e]

    ensure
      @current += 1

      if eol?
        print "\n"
        report_progress
      end
    end
  end

  print "\n"
  puts "100% " unless eol?

  report_errors

  nil
end

#eol? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/batch.rb', line 80

def eol?
  @current % @width == 0
end

#progress ⇒ Object 



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# File 'lib/batch.rb', line 66

def progress
  return unless @size

  @current * 100 / @size
end

#report_error(item, error) ⇒ Object 



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# File 'lib/batch.rb', line 58

def report_error(item, error)
  $stderr.puts "#{item.inspect}: #{error}\n"
end

#report_errors ⇒ Object 



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# File 'lib/batch.rb', line 48

def report_errors
  return if @errors.empty?

  $stderr.puts "\nSome errors occured:\n\n"

  @errors.each do |item, error|
    report_error(item, error)
  end
end

#report_progress ⇒ Object 



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# File 'lib/batch.rb', line 72

def report_progress
  if progress
    print "#{progress.to_s.rjust 3, " "}% "
  else
    print "   ? "
  end
end

#total ⇒ Object 



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# File 'lib/batch.rb', line 62

def total
  @size
end