Find::Bin, use lib, in ruby

ruby-talk
1

Hi,

problem:

I have my own set of libraries located relative to my script in …/lib
i.e. my configuration is something like

rubyscripts/bin/script.rb
rubyscripts/lib/libforscript.rb

How can I tell script.rb where to look for libforscript.rb without
having to use absolute paths?

db

···

–
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Mar 19 St. Joseph’s Day, obeserved in Colombia, Costa Rica, Holy See,
Liechtenstein, San Marino, Spain, Venezuela
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2

$:.unshift “…/lib”
require “libforscript.rb”

···

On Thu, Mar 20, 2003 at 03:03:09AM +0900, Daniel Bretoi wrote:

rubyscripts/bin/script.rb
rubyscripts/lib/libforscript.rb

How can I tell script.rb where to look for libforscript.rb without
having to use absolute paths?

3

In bin/script.rb:
$: << “…/lib”

Now you can:
require ‘libforscript’

-austin
– Austin Ziegler, austin@halostatue.ca on 2003.03.19 at 13:33:42

···

On Thu, 20 Mar 2003 03:03:09 +0900, Daniel Bretoi wrote:

problem:

I have my own set of libraries located relative to my script in
…/lib i.e. my configuration is something like

rubyscripts/bin/script.rb
rubyscripts/lib/libforscript.rb

How can I tell script.rb where to look for libforscript.rb without
having to use absolute paths?

4

in script.rb do (on *nix systems)

prefix = File.dirname (FILE) << ‘/…/lib/’
require (prefix + ‘libforscript’)

-a

···

On Thu, 20 Mar 2003, Daniel Bretoi wrote:

Hi,

problem:

I have my own set of libraries located relative to my script in …/lib
i.e. my configuration is something like

rubyscripts/bin/script.rb
rubyscripts/lib/libforscript.rb

How can I tell script.rb where to look for libforscript.rb without
having to use absolute paths?

–

Ara Howard
NOAA Forecast Systems Laboratory
Information and Technology Services
Data Systems Group
R/FST 325 Broadway
Boulder, CO 80305-3328
Email: ahoward@fsl.noaa.gov
Phone: 303-497-7238
Fax: 303-497-7259
====================================

5

Daniel Bretoi lists@debonair.net writes:

Hi,

problem:

I have my own set of libraries located relative to my script in …/lib
i.e. my configuration is something like

rubyscripts/bin/script.rb
rubyscripts/lib/libforscript.rb

How can I tell script.rb where to look for libforscript.rb without
having to use absolute paths?

Adam Spiers, the co-developer of RubyPhoto, wrote a library to do this
that is included as part of the RubyPhoto distribution. Grab
abspath.rb and findbin.rb from:

http://www.plig.net/~ture/rubyphoto/rubyphoto-latest/

and stick them in your site library directory. You should then be
able to do things like:

require ‘findbin’
$:.push FindBin::RealBin + “/…/lib”

in your script, similar to how the Perl module works. It even handles
symlinks the same as the Perl one, IIRC.

At some point he or I might even write documentation for it and parcel
it up separately, though it’s not a terribly big module, so you should
be able to work out what’s going on.

···

–
Mark Hulme-Jones < ture@plig.net >

6

what if you were in /usr/bin/ while running script.rb? the ‘…/lib’ needs to
be relative to the location of script.rb, not the current working directory.

-a

···

On Thu, 20 Mar 2003, Brian Candler wrote:

On Thu, Mar 20, 2003 at 03:03:09AM +0900, Daniel Bretoi wrote:

rubyscripts/bin/script.rb
rubyscripts/lib/libforscript.rb

How can I tell script.rb where to look for libforscript.rb without
having to use absolute paths?

$:.unshift “…/lib”
require “libforscript.rb”

–

Ara Howard
NOAA Forecast Systems Laboratory
Information and Technology Services
Data Systems Group
R/FST 325 Broadway
Boulder, CO 80305-3328
Email: ahoward@fsl.noaa.gov
Phone: 303-497-7238
Fax: 303-497-7259
====================================

7

I’ve run into this problem before, i.e. your script is stored in a different
location to the current dir, and requires a file from the same directory as
itself. I simply put this at the top of my files:

$LOAD_PATH << File.dirname(FILE.gsub(/\/, ‘/’))

The gsub is needed on Windows systems because dirname only works with
forward slashes (is there any plan to fix this it’s a pain).

(I also prefer using $LOAD_PATH because I hate all that $: nonsence… its
completely unreadable)

Alan

“ahoward” ahoward@fsl.noaa.gov wrote in message
news:Pine.LNX.4.53.0303201609120.1795@eli.fsl.noaa.gov…

rubyscripts/bin/script.rb
rubyscripts/lib/libforscript.rb

How can I tell script.rb where to look for libforscript.rb without
having to use absolute paths?

$:.unshift “…/lib”
require “libforscript.rb”

what if you were in /usr/bin/ while running script.rb? the ‘…/lib’ needs
to
be relative to the location of script.rb, not the current working
directory.

···

On Thu, 20 Mar 2003, Brian Candler wrote:

On Thu, Mar 20, 2003 at 03:03:09AM +0900, Daniel Bretoi wrote:

-a

–

Ara Howard
NOAA Forecast Systems Laboratory
Information and Technology Services
Data Systems Group
R/FST 325 Broadway
Boulder, CO 80305-3328
Email: ahoward@fsl.noaa.gov
Phone: 303-497-7238
Fax: 303-497-7259
====================================

8

Yes, good point. What I often actually use is:

require ‘/etc/my.conf.rb’

and in there put

$:.unshift ‘/path/to/lib’

whilst developing a particular library.

I use $: only because I came across it in the Pickaxe before $LOAD_PATH, and
because I (wrongly) thought I’d have to “require ‘English’” to get it.

Cheers,

Brian.

···

On Fri, Mar 21, 2003 at 01:37:40AM +0900, ahoward wrote:

$:.unshift “…/lib”
require “libforscript.rb”

what if you were in /usr/bin/ while running script.rb? the ‘…/lib’ needs to
be relative to the location of script.rb, not the current working directory.