From ad6a802106dbb5432d8f65e3803f658abda8c7c6 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Mon, 24 Nov 2014 15:28:32 -0500
Subject: kconfigpp: Substitute variables

---
diff --git a/kconfigpp/kconfigpp.sh b/kconfigpp/kconfigpp.sh
index 90b03f1..0518544 100644
--- a/kconfigpp/kconfigpp.sh
+++ b/kconfigpp/kconfigpp.sh
@@ -22,33 +22,62 @@ set -u
 
 main()
 {
+	local script=
+	local arg=
+	local var=
+	local val=
+
+	if [ ${#} -lt 1 ]; then
+		usage >&2
+		exit 1
+	fi
+
+	script=''
+	for arg in "${@}"; do
+		case "${arg}" in
+			*=*)
+				IFS='=' read var val <<-EOF
+					${arg}
+					EOF
+				val="$(printf '%s' "${val}" | sed 's|/|\\/|g')"
+				script="${script}s/\$${var}/${val}/g;"
+				shift 1
+				;;
+			*)
+				break
+		esac
+	done
+
 	if [ ${#} -ne 1 ]; then
 		usage >&2
 		exit 1
 	fi
 
-	parse "${1}"
+	parse "${1}" "${script}"
 }
 
 usage()
 {
-	printf 'Usage: %s <kconfig-file>\n' "${0}"
+	printf 'Usage: %s [<var>=<val> ...] <kconfig-file>\n' "${0}"
 }
 
 parse()
 {
 	local file="${1}"
+	local script="${2}"
 	local line=
 
 	while IFS='' read line; do
 		if [ "x${line}" != "x${line#source}" ]; then
 			line="$(printf '%s' "${line}" | \
 				sed 's/^source[ \t][ \t]*"*\([^"]*\).*$/\1/')"
-			parse "${line}"
+			parse "${line}" "${script}"
 		else
 			printf '%s\n' "${line}"
 		fi
-	done <"${file}"
+	done <<-EOF
+		$(sed "${script}" <"${file}")
+		EOF
 }
 
 main "${@}"
--
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