From: "G.Durga Prasad" <gdprasad@...>
Date: 2006-04-14T00:29:40+09:00
Subject: Re: Shame on me poorr newbie " unexpected kend"

On 4/13/06, Kroeger, Simon (ext) <simon.kroeger.ext@siemens.com> wrote:
>
>
> > -----Original Message-----
> > From: Daniel Harple [mailto:dharple@generalconsumption.org]
> > Sent: Thursday, April 13, 2006 4:06 PM
> > To: ruby-talk ML
> > Subject: Re: Shame on me poorr newbie " unexpected kend"
> >
> > Don't use numbers as a substitute for booleans. Also, why are you
> > calling IO.popen? File.read would work fine.
> >
> > def ask(msg)
> >    loop do
> >      print "#{msg} [y/n]: "
> >      response = gets().strip
> >      if response == "y"
> >        return true
> >      elsif response == "n"
> >        return false
> >      else
> >        puts "Invalid response. Please enter y or n"
> >      end
> >    end
> > end
> >
> > def find_device
> >    puts "We are now trying to find the device"
> >    store = 0
> >    loops do
> >      usb_dev = "/proc/scsi/usb-storage/#{store}"
> >      usb = File.read(usb_dev)
> >      if ask("Found in #{usb_dev}: #{usb}. Is this your device?")
> >        @procdata = usb
> >        break
> >      else
> >        store += 1
> >      end
> >    end
> > end
>
> and you can simplify this even more:
> ------------------------------------------------------------------------
> -
> def ask(msg)
>    loop do
>      print "#{msg} [y/n]: "
>      response = gets().strip
>      return true if response == 'y'
>      return false if response == 'n'
>      puts "Invalid response. Please enter y or n"
>    end
> end
>
> def find_device
>    puts "We are now trying to find the device"
>    Dir["/proc/scsi/usb-storage/*"].each do |usb_dev|
>      usb = File.read(usb_dev)
>      return usb if ask("Found in #{usb_dev}: #{usb}. Is this your
> device?")
>    end && nil
> end
>
> procdata = find_device
> ------------------------------------------------------------------------
> -
>
> cheers
>
> Simon
>
> p.s.: I have no /proc/scsi/usb-storage (win2000) so this is untested.
>
>
Tested and am glad to get the following:
$ ruby find_usbdev.rb
We are now trying to find the device
Found in /proc/scsi/usb-storage/3:    Host scsi3: usb-storage
       Vendor: SanDisk Corporation
      Product: Cruzer Mini
Serial Number: 2004351462080892ebd0
     Protocol: Transparent SCSI
    Transport: Bulk
       Quirks:
. Is this your
device? [y/n]: y

Prasad