#! /bin/bash
#

function errexit() {
  exec >&2
  echo "Error: $@"
  exit 1
}

export LC_ALL=""
EDITOR=${EDITOR:-vi}

TDIR=$(dirname $0)
test -n "$TDIR" && cd $TDIR

CHANGESFILE=$(ls package/*.changes)
test -f "$CHANGESFILE" || errexit "No changes file '$CHANGESFILE'"

VERSIONFILE="VERSION.cmake"
test -f "$VERSIONFILE" || errexit "No version file '$VERSIONFILE'"

## Version.cmake tags in getversion() are still zypp specific.

function usage() {
  exec >&2
cat <<EOF

Usage:   $(basename $0) [OPTIONS]
Options: -h,-?,--help   This page.

$(basename $0) will load the changes file '$CHANGESFILE'
into your editor (\$EDITOR=$EDITOR), providing a new changes
entry template:

    -------------------------------------------------------------------
    Wed Jul 30 18:20:06 CEST 2008 - ma@suse.de

    -
    #---delete-or-release---# LAST RELEASED: 5.3.2 (2) NEW RELEASE: 5.4.0 (4)

The line '#---delete-or-release---#...' shows the last version submitted
to autobuild ('# LAST RELEASED:; tag in $VERSIONFILE). And also the current
version, asuming you already updated the $VERSIONFILE according to your changes.
(The number in parenthesis is _COMPATMINOR)


- Delete the line if you don't want to submit the package to autobuild.

- Leave the line in place if you want to submit the package.


Closing the editor you are prompted:

    #---delete-or-release---# LAST RELEASED: 5.3.2 (2) NEW RELEASE: 5.4.0 (4)
    (a)bort, (c)ontinue, (e)dit :

Choosing (c)ontinue will write the new changes file. The '#---delete-or-release---#'
line is missing in case you deleted it. It's presence will remind you
that it is going to be converted into:

    - version 5.4.0

and the '# LAST RELEASED:; tag in $VERSIONFILE will be updated accordingly.
Now check the result, check in your changes, build the package and submit
to autobuild.

Released by accident? Don't mind. Nothing bad will happen. If you want to
undo the change, restore the 'LAST RELEASED: ' entry in $VERSIONFILE and
delete the '- version' line in $CHANGESFILE'.

EOF
  exit 1
}

case "$1" in
  -[hH?]*)
    usage
    ;;
  --help)
    usage
    ;;
esac

function getversion() {
  cat "$VERSIONFILE" \
  | awk '
  function getnum() {
    gsub("^[^\"]*\"","")
    gsub("\".*$","")
  }
  /^ *SET *\( *LIBZYPP_MAJOR *"[0-9]+" *\)/       {getnum();major=$0}
  /^ *SET *\( *LIBZYPP_MINOR *"[0-9]+" *\)/       {getnum();minor=$0}
  /^ *SET *\( *LIBZYPP_PATCH *"[0-9]+" *\)/       {getnum();patch=$0}
  /^ *SET *\( *LIBZYPP_COMPATMINOR *"[0-9]+" *\)/ {getnum();compatminor=$0}
  /^# LAST RELEASED:/                             {gsub("^.*RELEASED: *","");gsub(" +$","");gsub(" +\\("," (");lastrelease=$0}
  END {
    thisrelease = major"."minor"."patch" ("compatminor")"
    if ( thisrelease == lastrelease )
      print "#---delete-or-release---# LAST RELEASED: "lastrelease" UNCHANGED RELEASE: "thisrelease
    else
      print "#---delete-or-release---# LAST RELEASED: "lastrelease" NEW RELEASE: "thisrelease
  }
  '
}

test -r /etc/sysconfig/mail && source /etc/sysconfig/mail
EMAIL="${USER}@${FROM_HEADER:-$(hostname -f)}"

GOTVERSION="$(getversion)"

TMPFILE=$(mktemp)
exec 3>&1-
exec >$TMPFILE
echo "-------------------------------------------------------------------"
echo "$(date) - $EMAIL"
echo ""
echo "- "
echo "$GOTVERSION"
echo ""
cat $CHANGESFILE
exec >&3

RES=e
while [ "$RES" == "e" ]; do
  $EDITOR $TMPFILE
  echo
  NEWREL=$(grep '#---delete-or-release---#' $TMPFILE)
  test -n "$NEWREL" && echo "$NEWREL"
  read -n 1 -p "(a)bort, (c)ontinue, (e)dit : " RES
  echo
  echo
  case "$RES" in
    [eE]*)
      RES=e
      ;;
    [cC])
      test -n "$NEWREL" && {
        echo "Remember new release in $VERSIONFILE"
        sed -i 's/^.*#---delete-or-release---#.*RELEASE:/- version/' $TMPFILE
        NEWREL=$(sed 's/^.*#---delete-or-release---#.*RELEASE:/# LAST RELEASED:/' <<<"$NEWREL")
        sed -i "s/^# LAST RELEASED:.*$/$NEWREL/" $VERSIONFILE
      }

      echo "Store new $CHANGESFILE"
      cp $TMPFILE $CHANGESFILE

      echo "$(sed 's/^.*#---delete-or-release---#.*RELEASE:/# CURRENT RELEASE:/' <<<"$GOTVERSION")"
      awk '{print}/^----------/{n=n+1; if ( n == 2 ) exit 0; }' $CHANGESFILE

      ;;
    *)
      echo "Leave $CHANGESFILE untouched"
      ;;
  esac
done

rm -f $TMPFILE