RE: [Axiom-developer] Check for item in PATH in Emacs?

[C Y]

Cool!  Thanks Bill.  I actually hacked up my own version yesterday
which might be a little simpler for our purposes, but I've yet to test
it on Windows.  I'll upload it to the wiki this morning - I THINK this
version should work without trouble on Windows or Linux, but I'll feel
better if it is confirmed ;-).

Cheers,
CY

--- "Page, Bill" <address@hidden> wrote:

> On Tuesday, May 02, 2006 11:13 PM C Y wrote:
> > 
> > Does anybody know of a way to check for, say, "axiom" in the
> > PATH on a particular system from Emacs?  Trying to run something
> > via comint seems to result in an error which stops everything.
> > I'm trying to first run "axiom" if it's available (it turns out
> > graphics do work when run from the Emacs buffer) and if it isn't
> > available fall back to "AXIOMsys".  I know I could do some hackery
> > with running "which axiom" on Linux but I'm hoping for something
> > more straightforward and portable.
> > 
> I'm no emacs hacker, but it looks like some code in emacs esh-ext
> might do what you want. See:
> 
>
http://www.cgl.uwaterloo.ca/~mmwasile/data/elisp/eshell-2.4.2/esh-ext.el
> 
> ...
> (defun eshell-search-path (name)
>   "Search the environment path for NAME."
>   (if (file-name-absolute-p name)
>       name
>     (let ((list (parse-colon-path (getenv "PATH")))
>         suffixes n1 n2 file)
>       (while list
>       (setq n1 (concat (car list) name))
>       (setq suffixes eshell-binary-suffixes)
>       (while suffixes
>         (setq n2 (concat n1 (car suffixes)))
>         (if (and (or (file-executable-p n2)
>                      (and eshell-force-execution
>                           (file-readable-p n2)))
>                  (not (file-directory-p n2)))
>             (setq file n2 suffixes nil list nil))
>         (setq suffixes (cdr suffixes)))
>       (setq list (cdr list)))
>       file)))
> ...
> 
> Regards,
> Bill Page.
> 


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