expect.rb in 1.8.2

[Phil Tomson]

On my Linux box I've got Ruby 1.8.1 installed and it seems to have the
expect library:

irb(main):011:0> require 'expect'
=> true
irb(main):012:0> VERSION
=> "1.8.1"


However when I try to do that on my Windows box, it doesn't know anything
about expect.

Has the expect lib been removed from 1.8.2? Or, is it just not available
on Windows? ( I thought it was just a pure-Ruby, simple implementation)

Phil

 

[Lennon Day-Reynolds]

Phil,

The 'expect.rb' library uses 'select()', which only works for sockets
on Windows, not regular file handles, IIRC. Looking at the source,
though, it seems to only work on a single file handle at a time,
anyway, so I'm not sure what it buys you something like the
uber-simple version below.

-- 'miniexpect.rb'
require 'timeout'

class IO
def expect(pat, wait=9999999)
result = nil
buff = ''
begin
timeout(wait) do
c = getc.chr
buff << c

if pat.match(buff)
result = [buff, *mat.to_a[1..-1]]
end
end
rescue Timeout::Error; end

if block_given?
yield result
else
return result
end
end
end

 

[Phil Tomson]

Phil,

The 'expect.rb' library uses 'select()', which only works for sockets
on Windows, not regular file handles, IIRC. Looking at the source,
though, it seems to only work on a single file handle at a time,
anyway, so I'm not sure what it buys you something like the
uber-simple version below.

-- 'miniexpect.rb'
require 'timeout'

class IO
def expect(pat, wait=9999999)
result = nil
buff = ''
begin
timeout(wait) do
c = getc.chr
buff << c

if pat.match(buff)
result = [buff, *mat.to_a[1..-1]]
end
end
rescue Timeout::Error; end

if block_given?
yield result
else
return result
end
end
end

 

[Phil Tomson]

Phil,

The 'expect.rb' library uses 'select()', which only works for sockets
on Windows, not regular file handles, IIRC. Looking at the source,
though, it seems to only work on a single file handle at a time,
anyway, so I'm not sure what it buys you something like the
uber-simple version below.

-- 'miniexpect.rb'
require 'timeout'

class IO
def expect(pat, wait=9999999)
result = nil
buff = ''
begin
timeout(wait) do
c = getc.chr
buff << c

if pat.match(buff)
result = [buff, *mat.to_a[1..-1]]
end
end
rescue Timeout::Error; end

if block_given?
yield result
else
return result
end
end
end

I hit 'send' a bit prematurely...


There is no PTY lib on Windows either (not surprising); all of the expect
examples I've seen seem to rely on it.

Phil