Add --color Grep option to the command dynamically

* lisp/progmodes/grep.el (grep-template, grep-find-template):
Update the description for <C>.  (Bug#20728)
(grep-compute-defaults): Don't add the --color option to
grep-options.  Only add it to grep-command.
(grep-expand-keywords): Expand the env value opts into <C>.
(grep-expand-template): Replace cf in the env with the opts list,
that can include -i and --color.

* lisp/progmodes/xref.el (xref-collect-matches): Do not remove
"--color=always" from the template, because we don't have to.

1 files changed, 9 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 84636552973..1f8cbbc1b98 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -883,6 +883,15 @@ word syntax, use `\sw' instead.
 ** The `diff' command uses the unified format now.  To restore the old
 behavior, set `diff-switches' to `-c'.
 
+** `grep-template' and `grep-find-template' values don't include the
+--color argument anymore.  It's added at the <C> place holder position
+dynamically.
+
+** `grep-template' and `grep-find-template' values don't include the
+--color argument anymore.  It's added at the <C> place holder position
+dynamically.  Any third-party code that changes these templates should
+be updated accordingly.
+
 
 * Lisp Changes in Emacs 25.1