Fix variables in recipes, prefix expansion, and -a switch behavior

recipe.go

@@ -46,15 +46,19 @@ func stripIndentation(s string, mincol int) string {
 func printIndented(out io.Writer, s string, ind int) {
 	indentation := strings.Repeat(" ", ind)
 	reader := bufio.NewReader(strings.NewReader(s))
+	firstline := true
 	for {
 		line, err := reader.ReadString('\n')
 		if len(line) > 0 {
-			io.WriteString(out, indentation)
+			if !firstline {
+				io.WriteString(out, indentation)
+			}
 			io.WriteString(out, line)
 		}
 		if err != nil {
 			break
 		}
+		firstline = false
 	}
 }