Ruby Weekly News 3rd - 9th October 2005

T

Tim Sutherland

http://www.rubyweeklynews.org/20051009.html

Ruby Weekly News 3rd - 9th October 2005
---------------------------------------

Ruby Weekly News is a summary of the week's activity on the ruby-talk
mailing list / the comp.lang.ruby newsgroup, brought to you by Tim
Sutherland, with contributions by Christophe Grandsire.

Readers are invited to contribute to the next newsletter by visiting
http://www.rubyweeklynews.org/newsletters/contribute/next.

--> A note from Tim: Over the last couple of weeks, there have been many posts
on ruby-talk and (more-so) ruby-core concerning the pending addition of
the RubyGems packaging system to the standard Ruby library.

A particular point of dispute has been around the role of people who
package libraries and applications for other systems (such as RPMs or DEB
packages), and the impact that even-more-popular RubyGems will have on
this work.

(For example, the relative difficulty of repackaging a gem as a different
type of package, versus starting from a tarball; how to deal with
depdendencies when some libraries are installed via RubyGems, others by
tarball, and others by RPM.)

The problem with popular topics is that they are also hard to summarise,
so that often the most popular threads are ignored in the newsletter, while
those with one or two posts are given attention. That's happened with the
RubyGems threads, with the exception of this meta-summary :)

Articles and Announcements
--------------------------

* Looking for book reviewers
----------------------------

Dave Thomas asked for volunteers to review the draft of Chris Pine's
book "Learn to Program with Ruby".

"However, before you all rush to sign up, there's a catch. I'm really
looking for folks who are the book's target audience: folks with
little or no programming experience who want to learn how to code.
They'll probably be from mid teens on up, curious, and happy to give
honest feedback as they go through the book."

* ruby.codefetch.com offers API and books search
------------------------------------------------

cosmo announced Ruby support for the Codefetch website. It now allows
you to search for Ruby code contained in publically available source
code from Ruby books.

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Tutorial: Rails + RubyScript2Exe = Executable *
* ----------------------------------------------- *
* *
* Erik Veenstra had been getting a lot of emails from people asking how *
* to package their Rails applications up as a single executable, using *
* RubyScript2Exe. *
* *
* So he wrote a tutorial ... *
* *
* Following the instructions, you can turn your app into an *
* executable (on Windows, Linux or MacOS X). Run it, and the application *
* runs, allowing you to connect to it from your web browser, all without *
* the need to install Ruby, Rails, a database system or configure a web *
* server. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

User Group News
---------------

* Beer & Pizza SIG; 8 pm, 10/4, San Francisco, CA, USA
------------------------------------------------------

Rich Morin announced a last minute meeting of the "Bay Area Ruby Beer
& Pizza SIG".

Oops, it was on October 4th, so if you depend on the Ruby Weekly News
for your user-group meeting announcements, then you missed it by at
least a week.

* Johannesburg, SA (and surrounding areas) Ruby Users Group
-----------------------------------------------------------

Luke Randall is gauging interest in setting up a Ruby Users Group in
Johannesburg, South Africa.

"f you live in Jo'burg (or Pretoria, etc. and are willing to
travel), please reply on or off list so that I can see how many people
are interested, and we can hopefully get this started."

* Boston Ruby Users Group is tomorrow (Tuesday) at 7PM!
-------------------------------------------------------

Boston.rb hold Ruby User Group meetings on the first Tuesday of every
month.

Greg Brown:

| I think it would be cool if UNH.rb (University of New Haven) took a
| field trip of sorts up to Boston for one of your meetings some time
| in the near future. What do you think? If it worked out well, maybe
| we could return the favor some time for your group and host you down
| here in Connecticut.

Link of the Week
----------------

* Ruby Code & Style
-------------------

http://www.artima.com/rubycs/index.html

| Ruby Code & Style is a peer-reviewed, online journal for the Ruby
| community. We will focus on bringing a steady stream of high quality
| articles written by Rubyists all over the world which will showcase
| the strengths of this language and the ingenuity of its users in
| solving some real-life non-trivial problems.

The editors are James Britt and Shashank Daté, and the journal also
has an advisory board comprising many well known Rubyists, including
Matz.

"PS: Writers wanted. We're looking for experienced Rubyists to write
articles covering the sort of hard-core technical stuff that's
currently hard to find."

(See also the [comp.lang.ruby announcement].)

Threads
-------

Text Image (#50)
----------------

James Edward Gray II's Ruby Quiz #50 was to create a program that converts
images into ASCII-art.

Several people posted delightfully simple solutions that used the RMagick
library to do all the work of reading the image, resizing it and changing
the colour depth.

Ruby for Palm OS?
-----------------

Brian Le Roy wondered if it is possible to run Ruby on Palm OS devices.

Matz said no, not with the current Ruby implementation, as it requires
POSIX system calls that are not available on that platform. He recommended
the Linux-based Zaurus instead for Ruby-on-small-devices.

New ruby-lang website?
----------------------

Vincent Foley asked about the status of the ruby-lang.org website redesign
- there was a flurry of activity at the start of the year, then silence.

Curt Hibbs reported:

| It hasn't disappeared. There has been sporadic progress over the past
| few months. The visual design was set and the recent efforts have been
| on implementing the design and populating it with initial content.

"I know that from the outside it just looks like nothing is happen, but
please be patient."

RubyConf2005Facebook page on RubyGarden wiki
--------------------------------------------

Francis Hwang:

"Maybe I'm just vain and want everyone to see my face, but I thought it
might be useful to have a publically viewable page of photos of people who
are going to be at RubyConf this year."

fun with splats
---------------

Martin DeMello posted some code that shows that the * (splat) operator
works even when you might not expect it to.

class A
include Enumerable

def each
yield :foo
yield :bar
yield :baz
end
end

a = A.new
b = *a #=> [:foo, :bar, :baz]

He explained that it does the right thing because * works by calling to_a,
which is defined by Enumerable.

Neato.

select! not present but reject! is
----------------------------------

Geert Fannes found it strange that Array#reject! exists, but Array#select!
does not. Why is there this discrepancy?

Mark Hubbart gave a good explanation:

| The english words "select" and "reject" are not opposites. "reject" and
| "keep" might be, as someone else suggested.
|
| Going back, say you have a box of apples, some of which are shiny, the
| rest of which are dull. You don't want the dull ones. If you say:
|
| apple_box.reject! {|apple| apple.dull?}
|
| ..it sounds like you want to reject, or throw out, any dull apples,
| leaving only the shiny ones. The opposite would be:
|
| apple_box.keep! {|apple| apple.shiny?}
|
| ..because you want to keep only the shiny ones. "keep" implies that the
| rest are not kept, and are thrown out.
|
| On the other hand, if you said:
|
| apple_box.select! {|apple| apple.shiny?}
|
| It implies that you want to keep both; you remove the selected ones from
| the box, and leave the unselected ones behind.

(The name keep! was suggested by Jacob Fugal, who nonetheless thought that
Array#select! should be included in the standard library. Jacob also
introduced us to shiny apples.)

A similar argument was put forward by David A. Black, who felt that it is
unnatural to associate "selecting" with a destructive operation. Matz
agreed with this reason, but noted that Array#map! used to not exist for
the same reason. "Now we have map! in Array class. Same thing could happen
on select!"

David also mused about the possibility of a Array#delete_unless method, to
pair with Array#delete_if.

There were almost fifty posts in the thread, with a mixture of views.
(In spite of this summary focusing on those against adding the method.)

Much of the discussion was around the philosophy of `bang-method's (those
whose name ends in '!'), with some proponents of Array#select! saying that
(for Array at least), bang-methods are by convention simply in-place
variants of their non-bang counterparts, and that intuitive arguments
around the meaning of the word `select' are therefore irrelevant - all
that matters for select! is that it's an alternative to select.

RubyConf video, audio, streams and recordings?
----------------------------------------------

ES was sad.

| Sadly, I cannot attend this year (I will send you pictures from my COBOL
| Retreat in the Rockies) but I sensed a definite lack of any firm
| understanding of the state of capturing the wonderful essences of
| rubydom on redistributable media?

Following some requests for help, and responses to the same, it was
reported that mp3s of the sessions will be posted after the conference.
Hurrah!

Can ruby replace c?
-------------------

Q: Can Ruby replace the C programming language?

A: No. :)

ruby-dev summary 27103-27392
----------------------------

Takaaki Tateishi posted the latest summary of the Japanese list ruby-dev.

The Santa Matz tradition is alive and well, with Ruby 1.8.4 due on
December 24.

YARV Compile and Disassemble CGI
--------------------------------

Son-shi Koichi Sasada created a simple web application to demonstrate
YARV: enter Ruby code and bytecode comes out.

YARV is "Yet Another Ruby VM"; a humble name for a very important project
that Matz says will be the VM for Ruby 2.0.

ActiveRecord and FXRuby
-----------------------

Graham Foster wanted to know if there was anything stopping him using the
ActiveRecord object-relational mapper library (popularised for its role in
Rails) with an FXRuby GUI application?

David Naseby said that it would work, in fact he had used it in exactly
this scenario.

| I've built a beer brewing helper in FXRuby/ActiveRecord with a SQLite db
| to keep it all nice and file-y. No problems, no conflicts. Almost got to
| the stage where I built scaffolding, before I remembered I was building
| the program to help me brew beer, rather than brewing beer to help me
| program.

The only difference between using ActiveRecord inside of Rails, and using
it outside, is that in the latter case you'd typically call
ActiveRecord.establish_connection directly with the database connection
information (such as driver, username, host, password), rather than
relying on a config/database.yml file.

New Releases
------------

Ruby Win32 Drag and Drop 0.5
----------------------------

Wayne Vucenic released "Ruby Win32 Drag and Drop" version 0.5, a Windows
Explorer Drop Handler allowing one to drag and drop files and text onto a
.rb program.

rctool-1.0.0
------------

rubikitch released rctool 1.0.0, a library for projects that need to
modify other programs' rcfiles (such as .bashrc, .emacs).

Users are shown the changes that will be made to their files before going
through with the alteration.

el4r-0.9.2 - EmacsLisp for Ruby
-------------------------------

rubikitch announced the latest version of El4r, with which you can write
Emacs programs in EmacsRuby instead of EmacsLisp.

Configuration is now automatic, it works in Windows, can be installed to
any directory, and more.

Rake 0.6.2
----------

Jim Weirich posted a small update to the Rake build tool. This version
fixes a compatibility problem with Rails projects.

Ruby for Rose RealTime v0.2.0
-----------------------------

Damphyr introduced "Ruby for Rose RealTime", a library that enables you to
access models in IBM Rational Rose RealTime on Windows.

KirbyBase 2.3 beta 2
--------------------

Jamey Cribbs announced beta2 of KirbyBase, a pure-Ruby database management
system that stores its data as plain-text files.

Changes include a new YAML column type, automatic use of indices when they
exist (resulting in queries being much faster in some cases), and bug
fixes.
 

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