[ANN] Grepper: object-oriented grepping

ruby-talk
1

Hi --

If you feel the need to do simple object-oriented grepping, have a
look at the Grepper class, which is in a project I've started on
RubyForge (http://rubyforge.org/projects/grepper/). You give a Grepper
object a list of files, a pattern, some options... and it creates a
result set, which you can then walk through.

   g = Grepper.new
   g.files = %w{ one.txt two.txt three.txt }
   g.options = %w{ B2 } # two lines of before-context
   g.run

   g.results.each do |file, result|
     result.matches.each do |lineno,before,line,after|

   etc.

There's also a Formatter, which does its best to emulate standard
grep(1) output. In fact the whole thing started as an experiment in
implementing grep in Ruby. I then decided to create a layer that just
did the grep logic, on top of which I could build the output
formatting and so forth.

Let me know if any bugs, questions, etc.

David

···

--
David A. Black / Ruby Power and Light, LLC
Ruby/Rails consulting & training: http://www.rubypal.com
Coming in 2009: The Well-Grounded Rubyist (http://manning.com/black2)

2

David A. Black escreveu:

Hi --

If you feel the need to do simple object-oriented grepping, have a
look at the Grepper class, which is in a project I've started on
RubyForge (http://rubyforge.org/projects/grepper/\). You give a Grepper
object a list of files, a pattern, some options... and it creates a
result set, which you can then walk through.

  g = Grepper.new
  g.files = %w{ one.txt two.txt three.txt }
  g.options = %w{ B2 } # two lines of before-context
  g.run

  g.results.each do |file, result|
    result.matches.each do |lineno,before,line,after|

  etc.

There's also a Formatter, which does its best to emulate standard
grep(1) output. In fact the whole thing started as an experiment in
implementing grep in Ruby. I then decided to create a layer that just
did the grep logic, on top of which I could build the output
formatting and so forth.

Let me know if any bugs, questions, etc.

David

Hi David,
Very cool your idea! I will take a look and make some codes to see the power of the Grepper.
Hugs,
- Tiago