From ab9200cc0e1166eeeef7690fa6a67a8d8ce07c5c Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Tue, 12 Mar 2019 19:55:00 -0400
Subject: ob_parse_control(): Rewrite missing fields handling

Get rid of echo and sed.
---
diff --git a/lib/control.sh b/lib/control.sh
index b99a05c..3bcedbc 100644
--- a/lib/control.sh
+++ b/lib/control.sh
@@ -80,6 +80,7 @@ ob_parse_control()
 	local line=
 	local name=
 	local value=
+	local sep=
 
 	if [ ${#} -eq 3 ]; then
 		file="${1}"
@@ -173,15 +174,15 @@ ob_parse_control()
 	fi
 
 	if ${check_fields}; then
-		req_fields="${req_fields## }"
-		req_fields="${req_fields%% }"
-		if [ -n "${req_fields}" ]; then
+		case "${req_fields}" in *[!\ ]*)
 			# Missing required control fields.
-			req_fields="$(echo "${req_fields}" | sed 's/  / /g' | \
-				sed "s/ /$(ob_get_msg 'list_item_separator')/g")"
+			sep="$(_ob_get_msg 'list_item_separator')"
+			req_fields="$(printf "%s${sep}" ${req_fields}; \
+				printf 'x')"
+			req_fields="${req_fields%${sep}x}"
 			_ob_parse_control_error "${file}" '0' \
 				'control_missing_fields' "${req_fields}"
-		fi
+		esac
 	fi
 
 	return 0
--
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