- Fix pcre detection

- Add --color={always,never,tty} argument
- Add --devices (analogous to --directories)
- Don't enable blinking by default
- Document changes

* configure.in: Detect pcre correctly even when it's in
non-standard locations, using pcre-config
* src/grep.c: Add --color={always,never,tty} argument (like in ls)
* src/grep.c: Turn off blinking in the default colorization
* src/grep.c: Add --devices (-D) switch (analogous to --directories)
* doc/grep.texi, doc/grep.1: Document changes (--color, --devices, -D)

1 files changed, 14 insertions, 2 deletions

diff --git a/doc/grep.texi b/doc/grep.texi
index 316c57c4..0e86ca39 100644
--- a/doc/grep.texi
+++ b/doc/grep.texi
@@ -261,11 +261,12 @@ Print @var{num} lines of leading context before matching lines.
 @cindex context
 Print @var{num} lines of output context.
 
-@item --colour
-@itemx --color
+@item --colour[=@var{WHEN}]
+@itemx --color[=@var{WHEN}]
 @opindex --colour
 @cindex highlight, color, colour
 The matching string is surrounded by the marker specify in @var{GREP_COLOR}.
+@var{WHEN} may be `never', `always', or `auto'.
 
 @item -@var{num}
 @opindex -NUM
@@ -314,6 +315,17 @@ byte offsets
 depend on whether the @samp{-u} (@samp{--unix-byte-offsets}) option is
 used; see below.
 
+@item -D @var{action}
+@itemx --devices=@var{action}
+@opindex -D
+@opindex --devices
+@cindex device search
+If an input file is a device, FIFO or socket, use @var{action} to process it.
+By default, @var{action} is @samp{read}, which means that devices are
+read just as if they were ordinary files.
+If @var{action} is @samp{skip}, devices, FIFOs and sockets are silently
+skipped.
+
 @item -d @var{action}
 @itemx --directories=@var{action}
 @opindex -d