Rails - Sep 2009 - Best way to convert path slash for backtick usage?

Hi,
Depenbding on whether running under windows or unix/mac I obviously need
to use the \ instead of the / character for shell commands so I have 2
questions really
1) I would love to know if anyone has a neat way of dealing with
converting paths to use ''\'' instead of ''/''
for use with command line
calls like command and backtick?

2) How to determine the applications Operating System environment?

This is the function I need it for

  def create_command_line_string(cmd)
    result = Rails.root.join(cmd)
    logger.debug("@@@@ - #{result}")
    result
  end

Any ideas or pointers would be greatly appreciated
-- 
Posted via http://www.ruby-forum.com/.

James West wrote:
> Hi,
> Depenbding on whether running under windows or unix/mac I obviously need
> to use the \ instead of the / character for shell commands so I have 2
> questions really
> 1) I would love to know if anyone has a neat way of dealing with
> converting paths to use ''\'' instead of
''/'' for use with command line
> calls like command and backtick?
> 
> 2) How to determine the applications Operating System environment?
> 
> This is the function I need it for
> 
>   def create_command_line_string(cmd)
>     result = Rails.root.join(cmd)
>     logger.debug("@@@@ - #{result}")
>     result
>   end
> 
> Any ideas or pointers would be greatly appreciated
Just an adendum to this.
I''m actually trying to call cap deploy with the result of this function

    logger.debug("Creating domain")
    cmd = create_command_line_string("cap cloud_deploy:setup -S 
destination=#{self.requested_url}")
    response = `#{cmd}`
    exit_code = $?
    logger.debug("@@@@ Create domain response = #{response}, Exit code = 
#{exit_code}")
    exit_code

This is producing a command "c:/development/cloud/cap cloud_deploy:setup 
-S etc..."
Which is fine on the server as the Rails.root will give me the correct 
application root path but not on development.
In development I obviously need to just replace the / slashes with \ 
slashes.
It would be nice though if the ` backtick usage actually returned 
something. Anything at all would be good but the output from the 
logger.debug looks like this

@@@@ Create domain response = , Exit code 
So maybe backticks are not the right solution? Is there something that 
will give me more info over what is going on so I can deal with results 
more effectively?
-- 
Posted via http://www.ruby-forum.com/.

James West wrote:
> Hi,
> Depenbding on whether running under windows or unix/mac I obviously need
> to use the \ instead of the / character for shell commands so I have 2
> questions really
> 1) I would love to know if anyone has a neat way of dealing with
> converting paths to use ''\'' instead of
''/'' for use with command line
> calls like command and backtick?
path.gsub(''/'', ''\\'')

Actually, you may need 4 backslashes instead of 2; Ruby does weird thing 
with backslashes.  But that should get you going.

Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
-- 
Posted via http://www.ruby-forum.com/.

>> Depenbding on whether running under windows or unix/mac I obviously  
>> need
>> to use the \ instead of the / character for shell commands so I  
>> have 2
>> questions really
>> 1) I would love to know if anyone has a neat way of dealing with
>> converting paths to use ''\'' instead of
''/'' for use with command line
>> calls like command and backtick?
Split it into segments and use File.join()...that''s what it''s
there for.

-- MarkusQ

Markus Roberts wrote:
>>> Depenbding on whether running under windows or unix/mac I obviously
>>> need
>>> to use the \ instead of the / character for shell commands so I  
>>> have 2
>>> questions really
>>> 1) I would love to know if anyone has a neat way of dealing with
>>> converting paths to use ''\'' instead of
''/'' for use with command line
>>> calls like command and backtick?
> 
> Split it into segments and use File.join()...that''s what
it''s there for.
> 
> -- MarkusQ
File.join does exactly the same thing as Rails.root.join so that''s no 
good at all. But thanks anyway. It was worth a thought.
-- 
Posted via http://www.ruby-forum.com/.

Marnen Laibow-Koser wrote:
> James West wrote:
>> Hi,
>> Depenbding on whether running under windows or unix/mac I obviously
need
>> to use the \ instead of the / character for shell commands so I have 2
>> questions really
>> 1) I would love to know if anyone has a neat way of dealing with
>> converting paths to use ''\'' instead of
''/'' for use with command line
>> calls like command and backtick?
> 
> path.gsub(''/'', ''\\'')
> 
> Actually, you may need 4 backslashes instead of 2; Ruby does weird thing 
> with backslashes.  But that should get you going.
> 
> Best,
> --
> Marnen Laibow-Koser
> http://www.marnen.org
> marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
path.gsub would do the job. Thankyou.
I need to know how to determine the current operating system in order to 
decide whether or not to call the gsub routine. Any ideas?

I''m thinking that Rails must have a way of dealing with this otherwise 
it wouldn''t run on Windows.
-- 
Posted via http://www.ruby-forum.com/.

In Windows:
>> Dir.chdir ''c:/myscripts''
=> 0
>> Dir.pwd
=> "c:/myscripts"

I think you''re making a mountain out of a molehill. Ruby interprets the
path properly. Keep it to ''/'' and do input sanitation when the
user
tries to give you a ''\''

Yet, I don''t know what you''re doing, so..
>> PLATFORM
=> "i386-mswin32"
-- 
Posted via http://www.ruby-forum.com/.

Aldric Giacomoni wrote:
> In Windows:
>>> Dir.chdir ''c:/myscripts''
> => 0
>>> Dir.pwd
> => "c:/myscripts"
> 
> I think you''re making a mountain out of a molehill. Ruby
interprets the
> path properly. Keep it to ''/'' and do input sanitation
when the user
> tries to give you a ''\''
> 
> Yet, I don''t know what you''re doing, so..
No mountain, no molehill :-)
What I''m doing was clearly (I hope) explained in my 2 opening posts but
just to be clear here it is again

I''m actually trying to call cap deploy with the result of this function

    logger.debug("Creating domain")
    cmd = create_command_line_string("cap cloud_deploy:setup -S
destination=#{self.requested_url}")
    response = `#{cmd}`
    exit_code = $?
    logger.debug("@@@@ Create domain response = #{response}, Exit code
#{exit_code}")
    exit_code

This is producing a command "c:/development/cloud/cap cloud_deploy:setup
-S etc..."
Which is wrong on Windows :-)
> 
>>> PLATFORM
> => "i386-mswin32"
Thank you :-)
-- 
Posted via http://www.ruby-forum.com/.

On Sep 4, 2009, at 12:40 PM, James West wrote:
> Aldric Giacomoni wrote:
>> In Windows:
>>>> Dir.chdir ''c:/myscripts''
>> => 0
>>>> Dir.pwd
>> => "c:/myscripts"
>>
>> I think you''re making a mountain out of a molehill. Ruby
interprets
>> the
>> path properly. Keep it to ''/'' and do input sanitation
when the user
>> tries to give you a ''\''
>>
>> Yet, I don''t know what you''re doing, so..
>
> No mountain, no molehill :-)
> What I''m doing was clearly (I hope) explained in my 2 opening
posts
> but
> just to be clear here it is again
>
> I''m actually trying to call cap deploy with the result of this  
> function
>
>    logger.debug("Creating domain")
>    cmd = create_command_line_string("cap cloud_deploy:setup -S
> destination=#{self.requested_url}")
>    response = `#{cmd}`
>    exit_code = $?
>    logger.debug("@@@@ Create domain response = #{response}, Exit  
> code > #{exit_code}")
>    exit_code
>
> This is producing a command "c:/development/cloud/cap  
> cloud_deploy:setup
> -S etc..."
> Which is wrong on Windows :-)
>
>>
>>>> PLATFORM
>> => "i386-mswin32"
>
> Thank you :-)
> -- 

irb> PLATFORM
=> "universal-darwin9.0"
irb> File::SEPARATOR
=> "/"
irb> File::ALT_SEPARATOR
=> nil

Can you use either of these on Windows to construct a suitable gsub?

Guessing:
   cmd.gsub!(File::SEPARATOR, File::ALT_SEPARATOR) if  
File::ALT_SEPARATOR

Or you can go brute-force with:
gsub(''/'',''\\\\'')

irb> Dir.pwd
=> "/Users/rab/code/ruby"
irb> Dir.pwd.gsub(''/'',''\\\\'')
=> "\\Users\\rab\\code\\ruby"
irb> puts _
\Users\rab\code\ruby
=> nil

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org

> Guessing:
>    cmd.gsub!(File::SEPARATOR, File::ALT_SEPARATOR) if
> File::ALT_SEPARATOR
> 
> 
> -Rob
> 
> Rob Biedenharn    http://agileconsultingllc.com
> Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org
You absolute star :-)
That will do EXACTLY what I need. Thanks so much.
James
-- 
Posted via http://www.ruby-forum.com/.

>>>>> PLATFORM
>>> => "i386-mswin32"
>>
>> Thank you :-)
>> -- 
> 
> 
> irb> PLATFORM
> => "universal-darwin9.0"
> irb> File::SEPARATOR
> => "/"
> irb> File::ALT_SEPARATOR
> => nil
irb(main):060:0> RUBY_DESCRIPTION
=> "ruby 1.8.7 (2008-08-11 patchlevel 72) [i386-mswin32]"
irb(main):058:0> File::SEPARATOR
=> "/"
irb(main):059:0> File::ALT_SEPARATOR
=> "\\"

Hope that helps.
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