From 00fa1775a84ffc6327a493e47c3c2301052e3a27 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Sat, 05 Jan 2019 09:39:30 -0500
Subject: ob_parse_control(): Replace if construct with case

---
diff --git a/lib/control.sh b/lib/control.sh
index 9115d7f..bbca4d8 100644
--- a/lib/control.sh
+++ b/lib/control.sh
@@ -109,64 +109,65 @@ ob_parse_control()
 
 	while IFS= read -r line; do
 		line_nr=$(($line_nr + 1))
-		if [ -z "$(echo ${line})" ]; then
-			_ob_parse_control_error "${file}" "${line_nr}" \
-				'control_empty_line'
-		elif [ "${line#\#}" != "${line}" ]; then
-			# Comment.
-			:
-		elif [ "${line# }" = "${line}" ]; then
-			# "Name: Value" line.
-			if [ -n "${name}" ]; then
-				OB_CONTROL_NAME="${name}"
-				OB_CONTROL_VALUE="${value}"
-				"${field_cb}"
-				if [ ${?} -ne 0 ]; then
-					return 0
-				fi
-			fi
-			name="${line%%:*}"
-			value="${line#*:}"
-			value="${value# }"
-			if [ -z "${name}" \
-				-o "${name}" = "${line}" ]; then
-				# Badly formatted control field.
+		case "${line}" in
+			'')
 				_ob_parse_control_error "${file}" "${line_nr}" \
-					'control_bad_nv'
-				continue
-			fi
-			if ${check_fields}; then
-				if [ "${all_fields% ${name} *}" = \
-						"${all_fields}" ]; then
-					# Unknown field.
-					_ob_parse_control_error \
-						"${file}" "${line_nr}" \
-						'control_unknown_field' "${name}"
+					'control_empty_line'
+				;;
+			'#'*)  # Comment.
+				;;
+			[!\ ]*':'*)  # "Name: Value" line.
+				if [ -n "${name}" ]; then
+					OB_CONTROL_NAME="${name}"
+					OB_CONTROL_VALUE="${value}"
+					"${field_cb}"
+					if [ ${?} -ne 0 ]; then
+						return 0
+					fi
+				fi
+				name="${line%%:*}"
+				value="${line#*:}"
+				value="${value# }"
+				if [ -z "${name}" \
+					-o "${name}" = "${line}" ]; then
+					# Badly formatted control field.
+					_ob_parse_control_error "${file}" "${line_nr}" \
+						'control_bad_nv'
+					continue
+				fi
+				if ${check_fields}; then
+					if [ "${all_fields% ${name} *}" = \
+							"${all_fields}" ]; then
+						# Unknown field.
+						_ob_parse_control_error \
+							"${file}" "${line_nr}" \
+							'control_unknown_field' "${name}"
+					else
+						# Remove field from list of required fields.
+						req_fields="$(echo "${req_fields}" | \
+							sed "s/${name}//")"
+					fi
+				fi
+				if [ "${got_fields% ${name} *}" != \
+						"${got_fields}" ]; then
+					# Duplicate field.
+					_ob_parse_control_error "${file}" "${line_nr}" \
+						'control_duplicate_field' "${name}"
 				else
-					# Remove field from list of required fields.
-					req_fields="$(echo "${req_fields}" | \
-						sed "s/${name}//")"
+					got_fields="${got_fields}${name} "
 				fi
-			fi
-			if [ "${got_fields% ${name} *}" != \
-					"${got_fields}" ]; then
-				# Duplicate field.
-				_ob_parse_control_error "${file}" "${line_nr}" \
-					'control_duplicate_field' "${name}"
-			else
-				got_fields="${got_fields}${name} "
-			fi
-		else
-			# Continuation line.
-			if [ -z "${name}" ]; then
-				# Expecting a "Name: Value" line.
-				_ob_parse_control_error "${file}" "${line_nr}" \
-					'control_found_continuation'
-				continue
-			fi
-			value="${value}
+				;;
+			' '*)  # Continuation line.
+				if [ -z "${name}" ]; then
+					# Expecting a "Name: Value" line.
+					_ob_parse_control_error "${file}" "${line_nr}" \
+						'control_found_continuation'
+					continue
+				fi
+				value="${value}
 ${line# }"
-		fi
+				;;
+		esac
 	done <<-EOF
 		$(cat "${file}")
 		EOF
--
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