insert-header.sin
44e5311975eamaster

insert-header.sin
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			# Sed script that inserts the file called HEADER before the header entry.
			#
			# At each occurrence of a line starting with "msgid ", we execute the following
			# commands. At the first occurrence, insert the file. At the following
			# occurrences, do nothing. The distinction between the first and the following
			# occurrences is achieved by looking at the hold space.
			/^msgid /{
			x
			# Test if the hold space is empty.
			s/m/m/
			ta
			# Yes it was empty. First occurrence. Read the file.
			r HEADER
			# Output the file's contents by reading the next line. But don't lose the
			# current line while doing this.
			g
			N
			bb
			:a
			# The hold space was nonempty. Following occurrences. Do nothing.
			x
			:b
			}