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Re: File_Which What!? [message #32979 is a reply to message #32920]

Fri, 22 November 2002 11:16

rigby
Messages: 16
Registered: September 1995

Junior Member

"Mark Hadfield" <m.hadfield@niwa.co.nz> wrote in message news:<ark86l$d77$1@newsreader.mailgate.org>...
> "David Fanning" <david@dfanning.com> wrote in message
> news:MPG.1846c9eb188ae0b1989a3d@news.frii.com...
>> File_Which very sensibly does NOT search any
>> directory that does not contain either a .pro or
>> .sav file. (Why include directories on an IDL
>> search path that can't result in anything productive?
>> Slows everything down.)
>
> What?!
>
> This would be sensible, *if* FILE_WHICH was to be used only to search for
> .pro or .sav files. There is nothing in the documentation that says this is
> the case, and I (and David) have used it to search for files with other
> extensions. I'm just glad it was David who got tripped up by the hidden
> gotcha. (Not that I'm not sympathetic, David, but...)

I believe this isn't a FILE_WHICH problem, but a side effect of IDL's
expansion of the search PATH you requested. For UNIX (all I'm familiar
with) your IDL !PATH variable is built from your UNIX environment
variable PATH. You can prepend a "+" to a directory name in PATH to
ask that all its subdirectories be included in !PATH. But IDL excludes
subdirectories that don't contain .pro or .sav files; apparently IDL
does this path expansion and exclusion by calling Expand_Path() at
startup. (The documentation also says that even explicitly specified
directories in your PATH environment variable will be removed if the
have no .pro, etc, but that doesn't seem to be the case, at least on
my Solaris system.)

For Unix you can work around this by using the ALL_DIRS keyword in
Expand_Path():

IDL> print, getenv("IDL_PATH")
/home/rigby/idl:/home/rigby/idl/utilities:/home/phony2/s0/so ftware/idl5.5/idl_5.5/lib:+/home/rigby/working

;; I asked for /working and its subdirectories to be included, but ...

IDL> print, !path
/home/rigby/idl:/home/rigby/idl/utilities:/home/phony2/s0/so ftware/idl5.5/idl_5.5/lib

;; ... since there are no .pro files in /working or its
subdirectories, IDL
;; didn't include them in !path. The workaround is

IDL> !path = Expand_Path(getenv("IDL_PATH"),/all_dirs)

IDL> print, !path
/home/rigby/idl:/home/rigby/idl/utilities:/home/phony2/s0/so ftware/idl5.5/idl_5.5/lib:/home/rigby/working/subworking:/ho me/rigby/working

Maybe there's some similiar you can do in Windows.

--Wayne

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[Message index]

		File_Which What!? By: David Fanning on Wed, 20 November 2002 20:28
		Re: File_Which What!? By: rigby on Fri, 22 November 2002 11:16
		Re: File_Which What!? By: Jaco van Gorkom on Fri, 22 November 2002 07:54
		Re: File_Which What!? By: David Fanning on Fri, 22 November 2002 07:33
		Re: File_Which What!? By: Jaco van Gorkom on Fri, 22 November 2002 06:41
		Re: File_Which What!? By: JD Smith on Mon, 25 November 2002 14:00
		Re: File_Which What!? By: David Fanning on Thu, 21 November 2002 20:00
		Re: File_Which What!? By: Mark Hadfield on Thu, 21 November 2002 19:21
		Re: File_Which What!? By: David Fanning on Thu, 21 November 2002 09:46
		Re: File_Which What!? By: R.G. Stockwell on Thu, 21 November 2002 09:39
		Re: File_Which What!? By: David Fanning on Thu, 21 November 2002 06:04
		Re: File_Which What!? By: Nigel Wade on Thu, 21 November 2002 03:56
		Re: File_Which What!? By: R.Bauer on Thu, 21 November 2002 00:27
		Re: File_Which What!? By: David Fanning on Mon, 25 November 2002 14:40

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