Fellow Ruby developers.
I am building a prompt interface with Ruby 1.8.7. As such, I'm using 'readline' in my codes.
As it is a prompt interface I'm building, I want to create an option such that, should a user specify a logfile, all STDOUT and STDERR gets tee'd to said logfile as well as gets displayed on prompt (default STDOUT and STDERR).
I created a class "TeeIo" to do this. This example applies to STDOUT, but same would apply to STDERR. See below:
class TeeIo < IO
def initialize orig, file
@orig = orig
@file = file
end
def write string
@file.write string
@orig.write string
end
end
tee = TeeIo.new $stdout, File.new('foo', 'w')
$stdout = tee
Then, in my code, I create a TeeIo object and assign it to $stdout. I prefer this approach because I used gems in my code, and I don't get full control to all the STDOUT / STDERR activities (some are embedded in gem code, other libraries, etc.)
When I do so, I got "uninitialized stream" errors. Tracing that points the error back to readline.
I know that the irb uses readlines to read from prompt. As such, I tested the above portion of code on irb. I got a more elaborate message this time:
/arm/tools/ruby/ruby/1.8.7/rhe5-x86_64/lib/ruby/1.8/irb/input-method.rb:97:in `readline': uninitialized stream (IOError)
Does anyone know why doing what I did above affects 'readline' input stream?
Many thanks for your help!
