From 1b5f9fea85ca6fe0ba5786367e1da11bc4df808e Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Tue, 23 Apr 2019 16:58:06 -0400
Subject: ob_parse_control(): Replace if construct with case

---
diff --git a/src/control.sh b/src/control.sh
index 2a2d719..45600a6 100644
--- a/src/control.sh
+++ b/src/control.sh
@@ -56,79 +56,89 @@ parse_control()
 
 	while IFS='' read -r line; do
 		line_nr=$((${line_nr} + 1))
-		if [ "x$(echo ${line})" = 'x' ]; then
-			# Paragraph end.
-			if ${in_paragraph}; then
-				# The first line is blank to consolidate
-				# initialization code (see heredocument below).
-				in_paragraph='false'
+		case "${line}" in
+			'')
+				# Paragraph end.
+				if ${in_paragraph}; then
+					# The first line is blank to consolidate
+					# initialization code (see heredocument
+					# below).
+					in_paragraph='false'
+					if [ "x${name}" != 'x' ]; then
+						if ! "${field_cb}" "${name}" \
+								"${value}"; then
+							return 0
+						fi
+					fi
+					if ! "${paragraph_cb}"; then
+						return 0
+					fi
+					if [ "x${para_req_fields}" != 'x' ]; then
+						para_req_fields="$(printf \
+							"%s$(get_msg \
+							'list_item_separator')"\
+							${para_req_fields})"
+						_parse_control_error \
+							"${file}" "${line_nr}" \
+							'control_missing_fields'\
+							"${para_req_fields}"
+					fi
+				fi
+				para_req_fields="$(printf '%s\n' ${req_fields})"
+				got_fields="${LF}"
+				name=''
+				value=''
+				;;
+			'#'*)  # Comment.
+				in_paragraph='true'
+				;;
+			[!\ ]*':'*)  # "Name: Value" line.
+				in_paragraph='true'
 				if [ "x${name}" != 'x' ]; then
 					if ! "${field_cb}" "${name}" "${value}"
 					then
 						return 0
 					fi
 				fi
-				if ! "${paragraph_cb}"; then
-					return 0
+				name="${line%%:*}"
+				value="${line#*:}"
+				value="${value# }"
+				if [ "x${name}" = 'x' -o "x${name}" = \
+						"x${line}" ]; then
+					_parse_control_error "${file}" \
+						"${line_nr}" 'control_bad_nv'
+					continue
 				fi
 				if [ "x${para_req_fields}" != 'x' ]; then
-					para_req_fields="$(printf "%s$(get_msg \
-						'list_item_separator')" \
-						${para_req_fields})"
+					# Remove field from list of required
+					# fields.
+					para_req_fields="$(printf '%s' \
+						"${para_req_fields}" | \
+						grep -Fv "${name}")"
+				fi
+				if [ "x${got_fields%${LF}${name}${LF}*}" != \
+						"x${got_fields}" ]; then
+					# Duplicate field.
 					_parse_control_error \
 						"${file}" "${line_nr}" \
-						'control_missing_fields' \
-						"${para_req_fields}"
+						'control_duplicate_field' \
+						"${name}"
+				else
+					got_fields="${got_fields}${name}${LF}"
 				fi
-			fi
-			para_req_fields="$(printf '%s\n' ${req_fields})"
-			got_fields="${LF}"
-			name=''
-			value=''
-		elif [ "x${line#\#}" != "x${line}" ]; then
-			# Comment.
-			in_paragraph='true'
-		elif [ "x${line# }" = "x${line}" ]; then
-			# "Name: Value" line.
-			in_paragraph='true'
-			if [ "x${name}" != 'x' ]; then
-				if ! "${field_cb}" "${name}" "${value}"; then
-					return 0
+				;;
+			' '*)  # Continuation line.
+				in_paragraph='true'
+				if [ "x${name}" = 'x' ]; then
+					# Expecting a "Name: Value" line.
+					_parse_control_error "${file}" \
+						"${line_nr}" \
+						'control_found_continuation'
+					continue
 				fi
-			fi
-			name="${line%%:*}"
-			value="${line#*:}"
-			value="${value# }"
-			if [ "x${name}" = 'x' -o "x${name}" = "x${line}" ]; then
-				_parse_control_error "${file}" "${line_nr}" \
-					'control_bad_nv'
-				continue
-			fi
-			if [ "x${para_req_fields}" != 'x' ]; then
-				# Remove field from list of required fields.
-				para_req_fields="$(printf '%s' "${para_req_fields}" | \
-					grep -Fv "${name}")"
-			fi
-			if [ "x${got_fields%${LF}${name}${LF}*}" != \
-					"x${got_fields}" ]; then
-				# Duplicate field.
-				_parse_control_error "${file}" "${line_nr}" \
-					'control_duplicate_field' \
-					"${name}"
-			else
-				got_fields="${got_fields}${name}${LF}"
-			fi
-		else
-			# Continuation line.
-			in_paragraph='true'
-			if [ "x${name}" = 'x' ]; then
-				# Expecting a "Name: Value" line.
-				_parse_control_error "${file}" "${line_nr}" \
-					'control_found_continuation'
-				continue
-			fi
-			value="${value}${LF}${line# }"
-		fi
+				value="${value}${LF}${line# }"
+				;;
+		esac
 	done <<-EOF
 
 		$(cat "${file}")
--
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