From 518f28157358862ddda3bc94e546447b81e8936f Mon Sep 17 00:00:00 2001
From: Alejandro Colomar <alx@kernel.org>
Date: Fri, 3 Nov 2023 22:21:30 +0100
Subject: Add recursive search back in with -r

Signed-off-by: Alejandro Colomar <alx@kernel.org>
---
 bin/grepc              | 24 ++++++++++++++++++++++--
 share/man/man1/grepc.1 | 11 ++++++++++-
 2 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/bin/grepc b/bin/grepc
index db053d9..6d05b25 100755
--- a/bin/grepc
+++ b/bin/grepc
@@ -5,6 +5,7 @@
 iflag='';
 lflag='';
 kflag='no';
+rflag='no';
 tflag='no';
 t_e='no';
 t_fp='no';
@@ -38,7 +39,7 @@ grepc_err()
 
 grepc_parse_cmd()
 {
-	while getopts "chiklt:" opt; do
+	while getopts "chiklrt:" opt; do
 		case "$opt" in
 		c)
 			cflag='yes';
@@ -57,6 +58,9 @@ grepc_parse_cmd()
 			lflag='l';
 			kflag='yes';
 			;;
+		r)
+			rflag='yes';
+			;;
 		t)
 			case "$OPTARG" in
 			e)
@@ -228,11 +232,27 @@ grepc_patterns()
 }
 
 
+grepc_search()
+{
+	p="$(mktemp -u -t grepc.p.XXXXXX)";
+
+	grepc_patterns "$identifier" >"$p";
+
+	if test "$rflag" = 'no'; then
+		pcre2grep -${iflag}${lflag}HMn -f "$p" $files;
+	else
+		find $files -type f \
+		| xargs grep -${iflag}lPI -- "$identifier" \
+		| xargs pcre2grep -${iflag}${lflag}HMn -f "$p";
+	fi;
+}
+
+
 main()
 {
 	grepc_parse_cmd "$@" </dev/null;
 
-	pcre2grep -${iflag}${lflag}HMn -f <(grepc_patterns "$identifier") $files \
+	grepc_search \
 	| sed -E -f <(test "$kflag" = 'no'  && echo 's/^[^: ]+:[0-9]+:/\n\n&\n/') \
 	| perl -pe "$(test "$cflag" = 'yes' && echo 's/('"$identifier"')/\033[32m\1\033[0m/' || echo 's///')" \
 	| if [ -n "$lflag" ]; then
diff --git a/share/man/man1/grepc.1 b/share/man/man1/grepc.1
index 8785020..eb79522 100644
--- a/share/man/man1/grepc.1
+++ b/share/man/man1/grepc.1
@@ -21,7 +21,8 @@ and word boundaries are implicitly added to it in most cases.
 If no
 .I file
 is given,
-the program reads the standard input.
+nonrecursive searches read standard input,
+and recursive searches examine the working directory.
 .SS Types of code
 This program can search for several types of code.
 The following arguments can be passed to the
@@ -143,6 +144,14 @@ instead print the name of each input file
 from which output would normally have been printed.
 Each file is only printed once.
 .TP
+.B \-r
+Recursive search.
+If an input file is a directory,
+read all files under such directory, recursively,
+without following symbolic links.
+This is useful even if specific files are specified in the command line
+as it enables certain optimizations that cannot be enabled in filter mode.
+.TP
 .BI \-t " type"
 Restrict the search to a specific
 .I type
-- 
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