I have the following Ruby code:

def Mutt.afterConfigure
	system("perl -i -p -e 's/^#define DEBUG/#undef DEBUG/' config.h")
	system("perl -i -p -e 's/^#define USE_DOTLOCK.*$/#undef USE_DOTLOCK/' config.h")
end

It's not very efficient, becuase it forks/exec two processes just to
change a line in a file. But, it took me less than a minute to write.

Now, I want to write a generic function that will make changes to a file,
to use it like this:

patchFile 'config.h' do |x|
 x.gsub!("#define DEBUG", "#undef DEBUG")
 x.gsub!("#define USE_DOTLOCK", "#undef USE_DOTLOCK")
end


This don't work:

def patchFile(fname, &block)
	IO.foreach(fname) block
end
	

What do I do wrong?


-- 
Any technology distinguishable from magic is insufficiently advanced.
		-- Arthur C. Clarke