From: "lrlebron@..." <lrlebron@...>
Date: 2007-06-13T02:10:23+09:00
Subject: Re: Ruby way to update a file in place

On Jun 12, 1:10 am, barjunk <barj...@attglobal.net> wrote:
> On Jun 11, 6:23 pm, "lrleb...@gmail.com" <lrleb...@gmail.com> wrote:
>
>
>
> > On Jun 11, 2:42 pm, Li Chen <chen_...@yahoo.com> wrote:
>
> > > Hi all,
>
> > > I just wonder what is the Ruby way to update a file in place. Do I need
> > > to open a temporary/new file for writing and then rename the temporary
> > > file?
>
> > > Thanks,
>
> > > Li
>
> > > --
> > > Posted viahttp://www.ruby-forum.com/.
>
> > I've used the rio library for this before.http://rio.rubyforge.org/.
> > The website has some very good examples on how to use it.
>
> > Luis
>
> That's a nice library...I didn't notice any thing about locking the
> file object.  I'm assuming that that would be done outside the use of
> the rio object.
>
> I was also wondering if you thought you could use that library to read
> files that have records that look like:
>
> start line 1
> line 2
> line 3
> end line4
>
> and treat the above four lines as a record?
>
> Mike B.

Here's an example of using rio
require 'rio'
rio('C://test').all.files('*.vb') do |f|
   rio(f) <f.contents.gsub(/'UPGRADE.*\s/,"").gsub(/On Error GoTo
ErrHandler/,"Try").gsub(/ErrHandler:/,"Catch ex as Exception\n").gsub(/
Resume Next/,"End Try")
end


I had converted a bunch of vb6 files to vb.net. The VS2005 convertor
added hundreds of comment lines that started with 'UPGRADE. I also
wanted to change the vb6 Exception handlers
On Error GoTo ErrHandler
ErrHandler
Resume Next

to the vb.net format of
Try
Catch ex as Exception
End Try

This little snippet of code did the trick very quickly.

Luis