#!/bin/bash

set -e

if [ -n "$EX4DEBUG" ]; then
  echo "now debugging $0 $@"
  set -x
fi

dh_testdir
if [ -z "$(which grep-dctrl)" ] || ! [ -x "$(which grep-dctrl)" ]; then
  echo >&2 "ERR: no grep-dctrl binary"
  exit 1
fi

fakeroot debian/rules clean

if [ -n "$1" ]; then
  PACKAGESUFFIX="$1"
fi

#DEBUG=1

dh_testdir

cd debian

replacepkgname() {
  sed -e "s/exim4-daemon-custom/exim4-daemon-$PACKAGESUFFIX/g;\
  	  s/exim4-custom/exim4-$PACKAGESUFFIX/g"
}

copytextreplace() {
  FILE="$1"
  DSTFILE="$2"
  if [ -z "$DSTFILE" ]; then
    echo >&2 "no destination file given to copytextreplace $FILE"
    exit 1
  fi
  [ $DEBUG ] && echo >&2 "DBG: source $FILE"
  [ $DEBUG ] && echo >&2 "DBG: dst    $DSTFILE"
  if ! [ -e "$DSTFILE" ]; then
    < $FILE replacepkgname > $DSTFILE
    chmod --reference=$FILE $DSTFILE
  else
    echo >&2 "ERR: can't write to $DSTFILE, file exists"
    exit 1
  fi
}

NEEDEDFILES="exim4-daemon-custom.* rules control"
for file in $NEEDEDFILES; do
  if ! [ -e $file ]; then
    echo >&2 "ERR: $file does not exist, not starting"
    exit 1
  fi
done

# the grep-dctrl|grep construct is necessary on woody,
# since woody grep-dctrl does not give sensible return values.
if grep-dctrl --field=Package exim4-daemon-$PACKAGESUFFIX control | \
   grep -q '^Package:'; then
  echo >&2 "ERR: there is already a debian/control entry for exim4-daemon-$PACKAGESUFFIX, not starting"
  exit 1
fi

if grep -q exim4-daemon-$PACKAGESUFFIX rules; then
  echo >&2 "ERR: exim4-daemon-$PACKAGESUFFIX already mentioned in debian/rules, not starting"
  exit 1
fi

for file in exim4-daemon-custom.* ; do
  copytextreplace $file ${file/exim4-daemon-custom/exim4-daemon-$PACKAGESUFFIX}
done

echo >> control
grep-dctrl --field=Package exim4-daemon-custom control | \
  replacepkgname >> control

< rules sed "/^builddaemonpackages/ \
	     {s/^builddaemonpackages=/builddaemonpackages=exim4-daemon-$PACKAGESUFFIX /; \
	     }" > rules.new
echo >> rules.new
< rules sed -n "\
             /^build-exim4-daemon-custom/,/^[^[:space:]]/ \
	     { \
	      s/exim4-daemon-custom/exim4-daemon-$PACKAGESUFFIX/; \
	      s/exim4-custom/exim4-$PACKAGESUFFIX/; \
	      /^build-exim4-daemon-$PACKAGESUFFIX/p;
	      /^[^[:space:]]/d; \
	      p; \
	     }" \
>> rules.new
chmod --reference=rules rules.new
mv rules.new rules