insert-header.sin
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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
	}