Please find attached a reference implementation of this feature, using make.
-- Please do not send copies of list mail to me; I read the list! .''`. martin f. krafft <[EMAIL PROTECTED]> : :' : proud Debian developer and author: http://debiansystem.info `. `'` `- Debian - when you have better things to do than fixing a system
#: LEAD = ^\w{3} [ :[:digit:]]{11} @HOSTNAME@
#: HOSTNAME = [-_[:alnum:]]+
#: PID = [[:digit:]]{1,5}
#: PROC_SMTPD = postfix/[EMAIL PROTECTED]@\]
#: QUEUE_ID = (NOQUEUE|[[:upper:][:digit:]]+)
#: DN = [-_.[:alnum:]]+
#: FQDN = @[EMAIL PROTECTED]:alpha:]]{2,4}
#: IPADDR = ([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}
#: STATUS = [45][[:digit:]]{2}
#: EXT_STATUS = @STATUS@ ([[:digit:]]+\.){2}[[:digit:]]+
#: EMAIL = <[-_.+[:alnum:]]+@@DN@>
#: PROTO = proto=E?SMTP
#: FROM = [EMAIL PROTECTED]@
#: TO = [EMAIL PROTECTED]@
#: HELO = helo=<@DN@>
#: EOL = $
@LEAD@ @PROC_SMTPD@: @QUEUE_ID@: reject: RCPT from @[EMAIL PROTECTED]@[EMAIL
PROTECTED]: @EXT_STATUS@ @EMAIL@: Relay access denied; @FROM@ @TO@ @PROTO@
@HELO@@EOL@
#/usr/bin/make -f
#
# logcheck interpolation Makefile
#
# The Makefile allows for the automatic generation of logcheck/egrep -f files,
# using interpolation. Any lines starting with '#: ' and specifying a variable
# assignment are parsed into variable/value pairs, which are then subsequently
# interpolated recursively into the rest of the file, replacing occurrences of
# the variable name enclosed with 'at' signes (@).
#
# Example:
#
# #: MYVAR = myval @ANOTHER@
# #: ANOTHER = foo
#
# @MYVAR@
#
# This will yield
#
# myval foo
#
# Limitations:
# - no way to work around the situation when a string /@[_[:alnum:]]+@/ should
# actually be part of the result.
#
# Copyright © 2006 martin f. krafft <[EMAIL PROTECTED]>
# Released under the terms of the Artistic Licence
#
# Revision: 2006.06.30.1253
#
all: $(patsubst %.in,%,$(wildcard *.in))
LEAD = ^\#:
VAR = [_[:alnum:]]+
VAR_ASSIGN = ($(VAR))[[:space:]]*=[[:space:]]*(.*)
ESCAPES = s,\\,\\\\\\,g;s,/,\\/,g
%: SEDSCRIPT = $(shell sed -rne '$(ESCAPES)' -e 's,$(LEAD)
$(VAR_ASSIGN),s/@\1@/\2/g;,p' $<)
%: %.in
sed -re '/$(LEAD) /d' \
-e '/^(#|[[:space:]]*$$)/d' \
$< > $@
while egrep -q '@$(VAR)@' $@; do \
md5sum=$$(md5sum $@); \
sed -i -e "$(SEDSCRIPT)" $@; \
if [ "$$(md5sum $@)" = "$$md5sum" ]; then \
VAR="$$(sed -rne 's,.*@([EMAIL PROTECTED])@.*,\1,p'
$@)"; \
echo "E: found the variable $$VAR but did not know what
to substitute." >&2; \
exit 1; \
fi; \
cat $@; \
done
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