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Subject: Re: Any progress on "Fork issues ith long command lines and long $PATH"?
To: cygwin AT cygwin DOT com
References: <569E92D1 DOT 9030506 AT cornell DOT edu> <641659872 DOT 6133623 DOT 1453246485856 DOT JavaMail DOT yahoo AT mail DOT yahoo DOT com> <569EE230 DOT 2060600 AT cornell DOT edu> <158550468 DOT 20160120121946 AT yandex DOT ru>
From: Ken Brown <kbrown AT cornell DOT edu>
Message-ID: <569F86D2.2050104@cornell.edu>
Date: Wed, 20 Jan 2016 08:08:34 -0500
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On 1/20/2016 4:19 AM, Andrey Repin wrote:
> Greetings, Ken Brown!
>
>>> (2) I was using $USERPROFILE as an example. We have dozens of these
>>> environment variables pointing to dozens directories. They enable us to
>>> type in the same file name to emacs's find file (ctrl-x-ctrl-f) regardless
>>> of who is logged in or which computer we are logged into (assuming that
>>> every account has the same directory structure and propertly defined
>>> environment variables).  Yes we can manually translate them at a bash
>>> prompt but this is a lot more typing, cutting and pasteing. We also share
>>> the same .emacs file that contains thousands of file names that contain
>>> these environment variables. We will really missing feature of native
>>> emacs.
>
>> The fact that C-x C-f expands environment variables is not a special
>> feature of native Windows emacs.  But the expansion has to yield a valid
>> file name.  In the case of Cygwin emacs, that means a Posix path.
>
>> Maybe you could write a script that uses cygpath to convert the relevant
>> environment variables to Posix paths, and then call this script from
>> your .bashrc.
>
> I think it would be easier to just set Cygwin to use $USERPROFILE as $HOME.
> Then $HOME would be a POSIX path you can use in the emacs config.

The OP stated that USERPROFILE is one of dozens of problematic 
environment variables, so that wouldn't help.

Siegfried, if the script idea doesn't work for you, another possibility 
is to solve your problem in elisp by using the function 
cygwin-convert-file-name-from-windows, which exists in the Cygwin build 
of emacs.  For example, here's a snippet from server.el in the emacs 
development trunk:

;; Allow Cygwin's emacsclient to be used as a file
;; handler on MS-Windows, in which case FILENAME
;; might start with a drive letter.
(when (and (fboundp 'cygwin-convert-file-name-from-windows)
	   (string-match "\\`[A-Za-z]:" file))
   (setq file (cygwin-convert-file-name-from-windows file)))



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