From c14e5780068625391ed8ef632b728add2e6c9ce5 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Mon, 18 Mar 2019 16:03:24 -0400
Subject: ob_set_source_substvar(): Replace here-documents with printf

---
diff --git a/lib/control.sh b/lib/control.sh
index b5cc5d6..cd982e9 100644
--- a/lib/control.sh
+++ b/lib/control.sh
@@ -197,13 +197,10 @@ ob_set_source_substvar()
 	case "${name}" in *[!A-Za-z0-9-]* | '')
 		return 1
 	esac
-	name="$(tr 'a-z-' 'A-Z_' <<-EOF
-		${name}
-		EOF
-		)"
+	name="$(printf '%s' "${name}" | tr 'a-z-' 'A-Z_')"
 
 	# Trim leading and trailing whitespace from value.
-	value="$(sed -n '
+	value="$(printf '%s' "${value}" | sed -n '
 		H;             # Store each input line in the hold space.
 		${             # At the last line of input:
 		  g;           # restore the hold space into the pattern space,
@@ -211,10 +208,7 @@ ob_set_source_substvar()
 		  s/[\n]*$//;  # remove trailing newline characters, and
 		  p;           # print the results.
 		};
-		' <<-EOF
-		${value}
-		EOF
-		)"
+		')"
 
 	eval "_OB_SUBSTVAR_${name}=\"\${value}\""
 
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