Re: Using Expect in Ruby

On Oct 30, 2008, at 2:00 PM, Hugh Sasse wrote:

On Fri, 31 Oct 2008, James Gray wrote:

On Oct 30, 2008, at 1:10 PM, Hugh Sasse wrote:

On Fri, 31 Oct 2008, stephan.zimmer wrote:

I'm using Expect inside of a ruby script to control an external
program. So far I have only used libexpect from a C program and
would
have several questions regarding the Ruby interface of Expect,
maybe

I didn't know there was one yet.

expect.rb ships with Ruby.

Correct me if I'm wrong, but that is not Don Libes' Expect
implementation
and it has to be used with PTY. So it is not libexpect.

It's not libexpect. You are right.

I don't know who wrote it. It's a very short just adding a single
method to IO. Here's the whole thing:

$expect_verbose = false

class IO
def expect(pat,timeout=9999999)
buf = ''
case pat
when String
e_pat = Regexp.new(Regexp.quote(pat))
when Regexp
e_pat = pat
end
while true
if !IO.select([self],nil,nil,timeout) or eof? then
result = nil
break
end
c = getc.chr
buf << c
if $expect_verbose
STDOUT.print c
STDOUT.flush
end
if mat=e_pat.match(buf) then
result = [buf,*mat.to_a[1..-1]]
break
end
end
if block_given? then
yield result
else
return result
end
nil
end
end

I do expect that's intended to be used with pty.

James Edward Gray II

.