Adding upstream version 0.5.

Signed-off-by: Daniel Baumann <daniel@debian.org>

zgrep.in

@@ -8,6 +8,7 @@
 LC_ALL=C
 export LC_ALL
 args=
+default_prog=gzip
 have_pat=0
 list=0
 no_name=0
@@ -24,7 +25,9 @@ while [ x"$1" != x ] ; do
 		echo "transparent search on any combination of compressed and non-compressed"
 		echo "files. If any given file is compressed, its uncompressed content is"
 		echo "used. If a given file does not exist, zgrep tries the compressed file"
-		echo "names corresponding to the supported compressors."
+		echo "names corresponding to the supported compressors. If no files are"
+		echo "specified, the standard input is decompressed using the selected"
+		echo "compressor and fed to grep."
 		echo "The supported compressors are gzip, bzip2, lzip and xz."
 		echo
 		echo "Zegrep is a shortcut for \"zgrep -E\""
@@ -38,6 +41,10 @@ while [ x"$1" != x ] ; do
 		echo "Options:"
 		echo "  -h, --help          display this help and exit"
 		echo "  -V, --version       output version information and exit"
+		echo "      --gzip          use gzip as decompressor for stdin (default)"
+		echo "      --bzip2         use bzip2 as decompressor for stdin"
+		echo "      --lzip          use lzip as decompressor for stdin"
+		echo "      --xz            use xz as decompressor for stdin"
 		echo
 		echo "Report bugs to zutils-bug@nongnu.org"
 		echo "Zutils home page: http://www.nongnu.org/zutils/zutils.html"
@@ -48,6 +55,14 @@ while [ x"$1" != x ] ; do
 		echo "This script is free software: you have unlimited permission"
 		echo "to copy, distribute and modify it."
 		exit 0 ;;
+	--gz*)
+		default_prog=gzip ;;
+	--bz*)
+		default_prog=bzip2 ;;
+	--lz*)
+		default_prog=lzip ;;
+	--xz*)
+		default_prog=xz ;;
 	-[drRzZ] | --di* | --exc* | --inc* | --nu* | --rec*)
 		echo "$0: option $1 not supported"
 		exit 1 ;;
@@ -80,6 +95,11 @@ if [ ${have_pat} = 0 ]; then
 	exit 1
 fi
 
+if [ $# = 0 ]; then
+	${default_prog} -cdfq | grep ${args}
+	exit $?
+fi
+
 retval=0
 for i in "$@" ; do
 	if [ "$i" = "--" ] && [ ${two_hyphens} = 0 ] ; then two_hyphens=1