#!/bin/bash

# $Id$
# Magic script to make branch pulls from KDE SVN. Invoke it from a
# toplevel dir (i.e., debian/ exists) and let it figure out what to do.
# (C) 2005, Adeodato Simó <asp16@alu.ua.es>
# GPL'ed code follows.

# TODO
# <MadCoder> 1/ it does not work for arts
# <MadCoder>   (since it thinks kde is kde 1.4.0 instead of 3.4.0 ...)

set -e

# ensure same behavior independently of language used
export LANG=C

KDE_SVN=svn://anonsvn.kde.org/home/kde

dh_testdir

# Find out module and version
dpkg-parsechangelog | awk '

    /^Source/   { printf("%s ", $2) }
    /^Version/  {
                  sub(/^[0-9]+:/, "", $2)
                  sub(/-[^-]+$/,  "", $2)
		  printf("%s ", $2)
                  sub(/\.[0-9]+$/, "", $2)
                  print $2
                }

    ' | { read MODULE VERSION MAJOR_VERSION

# Determine the revision of the latest pull
# (empty string if there has been none)
shopt -s nullglob
LATEST_PULL=$(
               echo debian/patches/*_${MODULE}_branch_r*.diff |
               tail -1 |
               sed -re 's/.*_branch_r([0-9]+).*/\1/'
             )

TOPLEVEL=KDE

if [ "$MODULE" = "koffice" ]; then
	TOPLEVEL=koffice
fi

if [ -z "$LATEST_PULL" ]; then
    echo "This is the first pull for $MODULE $VERSION."
    ARG1="$KDE_SVN/tags/$TOPLEVEL/$VERSION/$MODULE"
    ARG2="$KDE_SVN/branches/$TOPLEVEL/$MAJOR_VERSION/$MODULE"
else
    echo "Patch until revision $LATEST_PULL exists."
    ARG1="-r$LATEST_PULL:HEAD"
    ARG2="$KDE_SVN/branches/$TOPLEVEL/$MAJOR_VERSION/$MODULE"
fi

# Get branch from the repo
TMP_PATCH=$(mktemp debian/patches/branch.XXXXXX)
trap "rm -f $TMP_PATCH" EXIT

echo "Getting diff file from server..."
svn diff "$ARG1" "$ARG2" | filterdiff -x 'debian/*' | filterdiff >${TMP_PATCH}

# Find out the revision of this new pull, unless empty
# Gross hack coming...
if [ ! -s ${TMP_PATCH} ]; then
    echo "Diff file was empty, no patch created."
    exit
else
    NEW_REVISION=$(sed -rne '2s/.*revision ([0-9]+).*/\1/p' ${TMP_PATCH})
fi

# Move patch to its final destination
DEST="debian/patches/01_${MODULE}_branch_r$NEW_REVISION.diff"
{ echo "#DPATCHLEVEL=0"; cat ${TMP_PATCH}; } > ${DEST}

echo "Created patch ${DEST}."
exit # ensure traps get executed

}