how to set CYGWIN variable for Emacs

[Daniel Barclay <Daniel dot Barclay at digitalfocus dot com>]

What's the recommended way to set the CYGWIN environment variable
when running in an NTEmacs shell buffer?

The CygWin FAQ gives instructions at 
http://sources.redhat.com/cygwin/faq/faq.html#SEC54:

  ...you need to add the following code to your ~/.emacs or ~/_emacs file 
  in order to use bash. ... 

        ;; This assumes that Cygwin is installed in C:\cygwin (the
        ;; default) and that C:\cygwin\bin is not already in your
        ;; Windows Path (it generally should not be).
        ;;
        (setq exec-path (cons "C:/cygwin/bin" exec-path))
        (setenv "PATH" (concat "C:\\cygwin\\bin;" (getenv "PATH")))
        ;;
        ;; NT-emacs assumes a Windows command shell, which you change
        ;; here.
        ;;
        (setq process-coding-system-alist '(("bash" . undecided-unix)))
        (setq w32-quote-process-args ?\")
        (setq shell-file-name "bash")
        (setenv "SHELL" shell-file-name) 
        (setq explicit-shell-file-name shell-file-name) 
        ;;
        ;; This removes unsightly ^M characters that would otherwise
        ;; appear in the output of java applications.
        ;;
        (add-hook 'comint-output-filter-functions
                  'comint-strip-ctrl-m)


However, this seems to run bash directly, bypassing the cygwin.bat
file.

Should Emacs run cygwin.bat directly?  Should the CYGWIN variable be
set in some place other than cygwin.bat (e.g., in Emacs or in the
NT environment) so that it gets set even if cygwin.bat isn't run?

Thanks,
Daniel
-- 
Daniel Barclay
Digital Focus
Daniel.Barclay@digitalfocus.com

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