m4_divert(-1)m4_dnl ### -*-m4-*-
###
### Basic definitions for distorted.org.uk Exim configuration
###
### (c) 2012 Mark Wooding
###

###----- Licensing notice ---------------------------------------------------
###
### This program is free software; you can redistribute it and/or modify
### it under the terms of the GNU General Public License as published by
### the Free Software Foundation; either version 2 of the License, or
### (at your option) any later version.
###
### This program is distributed in the hope that it will be useful,
### but WITHOUT ANY WARRANTY; without even the implied warranty of
### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
### GNU General Public License for more details.
###
### You should have received a copy of the GNU General Public License
### along with this program; if not, write to the Free Software Foundation,
### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

m4_changequote(<:, :>)
m4_changecom(<:#:#:>)

###--------------------------------------------------------------------------
### Output file preamble and postamble.

m4_divert(0)m4_dnl
### -*-conf-*- GENERATED FROM /etc/mail/m4/*.m4: DO NOT EDIT!
###
### Exim configuration for distorted.org.uk.

m4_divert(1000)m4_dnl
### GENERATED FROM exim4.conf.m4: DO NOT EDIT!
m4_divert(-1)

###--------------------------------------------------------------------------
### Useful macros.

## ONEOF(arg, ...)
##
## Output the first of its arguments that is non-empty.
m4_define(<:ONEOF:>, <:m4_ifelse(<:$#:>, <:1:>, <:$1:>,
	<:$1:>, <::>, <:ONEOF(m4_shift($@)):>, <:$1:>):>)

## DEFCONF(conf, default)
##
## Define config variable CONF, assigning it the DEFAULT value if not
## overridden by `SETCONF'.
m4_define(<:DEFCONF:>,
<:m4_ifdef(<:CONF_$1:>, <::>,
<:m4_define(<:CONF_$1:>, <:$2:>):>):>)

## SETCONF(conf, value)
##
## Set config variable VALUE.
m4_define(<:SETCONF:>, <:m4_define(<:CONF_$1:>, <:$2:>):>)

## FOREACH(what, list)
##
## The LIST is a comma-separated list of things, like an m4 argument list.
## For each item in the list, expand WHAT as if it's the body of a macro with
## the list item as its arguments.  In other words, the list item itself can
## be a list of comma-separated items, which are available as $1, $2, ...,
## within WHAT.
m4_define(<:_FOREACH:>, <:m4_dnl
m4_ifelse(<:$#:>, <:1:>, <:_foreach_func($1):>,
	<:_foreach_func($1)<::>_FOREACH(m4_shift($@)):>):>)
m4_define(<:FOREACH:>, <:m4_dnl
m4_pushdef(<:_foreach_func:>, <:$1:>)m4_dnl
_FOREACH($2)<::>m4_dnl
m4_popdef(<:_foreach_func:>):>)

## CLRSEP
##
## Clear the separator.  Use in conjunction with `SEP' below.
m4_define(<:CLRSEP:>, <:m4_define(<:__sep:>, <::>):>)m4_dnl

## SEP(newsep)
##
## Insert the current separator, and then set the separator to NEWSEP.  This
## is handy in `FOREACH' loops, in order to separate the items with the
## correct number of fenceposts: call `CLRSEP' before the list, and begin
## each item with SEP(...).
m4_define(<:SEP:>, <:__sep<::>m4_define(<:__sep:>, <:$1:>):>)m4_dnl

## DIVERT(name)
##
## Make _div:NAME be the current diversion.
m4_define(<:DIVERT:>, <:m4_dnl
m4_divert(m4_indir(<:_div:$1:>))m4_dnl
:>)

## SECTION(name, [sub])
##
## Contribute the following text to section NAME, inserting appropriate
## header text to the top of the section if necessary.  If a SUB-section name
## is given, then the contribution is made to the subsection, and the
## subsection's header (if any) is also inserted.
m4_define(<:SECTION:>, <:m4_dnl
DIVERT(<:$1:>)m4_dnl
m4_ifdef(<:_done:$1:>, <::>, <:m4_dnl
###--------------------------------------------------------------------------
m4_ifdef(<:_head:$1:>, <:m4_indir(<:_head:$1:>):>, <:begin $1:>)

m4_define(<:_done:$1:>, <:1:>):>)m4_dnl
m4_ifelse(<:$2:>, <::>, <::>, <:m4_dnl
DIVERT(<:$1/$2:>)m4_dnl
m4_ifdef(<:_done:$1/$2:>, <::>, <:m4_dnl
m4_ifdef(<:_head:$1/$2:>, <:<:##:> m4_indir(<:_head:$1/$2:>)
:>)m4_define(<:_done:$1/$2:>):>):>):>)

## LOOKUP_DOMAIN(dom, [if-found], [if-not-found])
##
## Look up DOM in the master domains file.  If it's found, put the
## information found in `$value' and expand to IF-FOUND, which may use `KV'
## to extract keyword values, and defaults to `$value'; otherwise, obey
## IF-NOT-FOUND, which may be the token `fail', or replacement text in
## braces.
m4_define(<:LOOKUP_DOMAIN:>,
	<:if exists{CONF_sysconf_dir/domains.conf} \
	     {${lookup {$1}partial0-lsearch{CONF_sysconf_dir/domains.conf} \
		       m4_ifelse(<:$2$3:>, <::>, <::>,
				 <:$2:>, <::>, <:{$value}$3:>,
				 <:$2$3:>)}} \
	     $3:>)

## KV(key, result)
##
## Extract the value of the named KEY in the ${extract ...}-style string in
## the current $value (where it may have been left by `LOOKUP-DOMAIN').  The
## RESULT is a pair {IF-FOUND}{IF-NOT-FOUND}; the former may use $value to
## refer to the value; the latter may be `fail' (not in braces) to force
## expansion failure.
m4_define(<:KV:>, <:${extract {$1}{$value}$2}:>)

## DOMKV(key, result)
##
## Extract the value of the named KEY in the ${extract ...}-style string in
## $domain_data; see `KV'.
m4_define(<:DOMKV:>, <:${extract {$1}{$domain_data}$2}:>)

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###----- That's all, folks --------------------------------------------------
m4_divert(-1)