call-shell-region: New defun
Suggested by Stefan Monnier in Bug#22679. * lisp/subr.el (call-shell-region): New defun; execute a command in an inferior shell with the buffer region as input. * lisp/simple.el (shell-command-on-region): Use it. * lisp/gnus/message.el (message-do-fcc): Idem. * doc/lispref/processes.texi: Document call-shell-region in the manual. ;* etc/NEWS: Add entry for this new function.
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