`t' to `auto-detect', and type from `boolean' to `choice'.
(grep-compute-defaults): Set `grep-highlight-matches' to `t'
if grep option `--color' is available, or to `nil' otherwise.
(grep-use-null-device): Remove redundant type `boolean' (`choice'
is already defined).
(grep-program, find-program, grep-find-use-xargs, grep-history)
(grep-find-history, grep-tag-default, grep-find-command)
(grep-regexp-alist, grep-process-setup, grep-compute-defaults):
Add autoload cookies, for unbundled packages that load `compile'
and expect all grep-related symbols to become defined.
(grep-regexp-alist): Give it the full functionality of gnu style compilation messages with line and column ranges. Ask me for the perl script I'm working on, that uses these.
(grep): New defcustom group.
(grep-window-height): New defcustom, like compilation-window-height.
(grep-auto-highlight): New defcustom, like compile-auto-highlight.
(grep-scroll-output): New defcustom, like compilation-scroll-output.
(grep-command, grep-use-null-device, grep-find-command)
(grep-tree-files-aliases, grep-tree-ignore-case)
(grep-tree-ignore-CVS-directories): Move to grep custom group.
(grep-setup-hook): New hook variable.
(grep-mode-map): New keymap for grep commands. Add Grep menu.
(grep-use-compilation-buffer): New defcustom.
(grep-last-buffer): New defvar, override compilation-last-buffer.
(grep): Add optional arg HIGHLIGHT-REGEXP. Doc fix.
Call compile-internal with args highlight-regexp and grep-mode-map.
