From: John Carter <john.carter@...>
Date: 2003-06-17T08:59:00+09:00
Subject: Re: Samples of daliy use

On Mon, 16 Jun 2003, Daniel [UNKNOWN] V�lkerts wrote:

> I found Ruby very interesting and I'll be glad if anyone could give some
> urls which demonstrates the use of ruby in our daily work ( e.g. common
> problems solved with ruby, administrative tasks etc.).

Just completed this now. Boss wanted to track from defect number in
the defect tracking tool to files changed. ie. Project is forking the
code, low tier model going into production, high tier model starting
development.  Unfortunately at the point of forking the code base and
porting it to new platform, there were still a number of defects.

My little Ruby scripts parses 'cvs log' output, grabs things that look
like defect tracking numbers and chucks it in a file. Another script uses
the cgi module to present the results, complete with hot links into
web interface of the defect tracking tool and into cvsweb showing exactly
which file was changed and what the log entry was.

Clip it to my Apache server (standard with Linux), email out the URL and
instantly the whole company has access to my results. You've just
got to love it.

Less than a days work.

Ooo I love the develope by iteration style in Ruby.

Version 1 looks like this....

File.open( "proj.log") do |log|
  log.each_line do |line|
    puts line
  end
end

-------------------
Very easy, can see it work.

Then the next version....

File.open( "proj.log") do |log|
  log.each_line do |line|
    if line =~ /^Working file: (\S+)/ then # Pick up file name with regex
      puts "File #{$1}"
    end
  end
end

----------

#Right, I'm finding the file start so lets iterate over files..

def each_file(log)
  log.each_line do |line|
    if line =~ /^Working file: (\S+)/ then
      yield $1
    end
  end
end

# Now my main loop is very clean...
File.open( "proj.log") do |log|
  each_file(log) do |file|
    puts file
  end
end
-----------------
#Now each file has a bunch of revisions associated with it...

def each_revision(log)
  log.each_line do |line|
    if line =~ /^revision (\S+)/ then
      yield $1
    end
  end
end

def each_file(log)
  log.each_line do |line|
    if line =~ /^Working file: (\S+)/ then
      yield $1
    end
    each_revision(log) do |rev|
      puts rev
    end
  end
end

# Now my main loop is very clean...
File.open( "proj.log") do |log|
  each_file(log) do |file|
    puts file
  end
end
---------------------
Hmm. I need to package a list of revisions with the file, no problem
spin a file class.

class CVSFile
  attr_reader :file_name
  attr_accessor :head_revision, :revision

  def initialize( name)
    @file_name = name
    @revision = Hash.new
  end
end

Hmm I need to package some info with the revision
number , no problem spin a class for that.

And so I go, alternately adding complexity, and then factoring it out into
nested iterations so each iteration is simple.

It's just soo blooming easy to do!


John Carter                             Phone : (64)(3) 358 6639
Tait Electronics                        Fax   : (64)(3) 359 4632
PO Box 1645 Christchurch                Email : john.carter@tait.co.nz
New Zealand

A Million Monkeys can inflict worse things than just Shakespeare on
your system.