On Wed 20 Sep 2017, Heinz Werner Kramski-Grote wrote:
> At some point in history, /usr/bin/co, /usr/bin/ci, /usr/bin/rlog etc. turned
> from .exe into shell scripts, which are now wrappers for the main program
> /usr/bin/rcs.exe.
>
> However, these shell scripts can not be called directly from a Windows
> command
> line and moreover can not be invoked by a Windows (not Cygwin) Emacs (25.2
> currentlly).
I don't use RCS, but have other Cygwin tools successfully with the
Windows port of emacs.
The advice below fixes your problem: if a program is an executable then
start-process runs normally, but if it is a script then the arguments
are modified to run the script via the shell:
(setq shell-file-name "/usr/bin/bash")
(setq shell-command-switch "-c")
(defun ajm:start-process-filter-scripts (args)
"Ensure `start-process' can handle executable Cygwin shell scripts."
(let ((program (nth 2 args)))
(if (or (null program) (executable-find program))
args
(list (nth 0 args) (nth 1 args)
shell-file-name shell-command-switch
(mapconcat #'identity (nthcdr 2 args) " ")))))
(advice-add 'start-process :filter-args #'ajm:start-process-filter-scripts)
Using "/usr/bin/bash" for shell-file-name requires using the cygwin-mount
package (available from the MELPA package archive). If you do not use
cygwin-mount,
then you will need to use something like "C:\cygwin\bin\bash.exe".
HTH,
AndyM
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