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.

1 files changed, 4 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 494a091a361..d30d1faf7ab 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -56,6 +56,10 @@ affected by this, as SGI stopped supporting IRIX in December 2013.
 * Changes in Emacs 25.2
 
 +++
+** The new funtion 'call-shell-region' executes a command in an
+inferior shell with the buffer region as input.
+
++++
 ** The new user option 'shell-command-not-erase-buffer' controls
 if the output buffer is erased between shell commands; if non-nil,
 the output buffer is not erased; this variable also controls where