#!/bin/bash

die() {

    echo $*

    exit 1

}

tarball=""

if [ $# -eq 1 ]; then

    tarball=$1

else

    die "usage: $0 path_to_archive"

fi

require_clean_work_tree() {

    # test if working tree is dirty

    git rev-parse --verify HEAD > /dev/null &&

    git update-index --refresh &&

    git diff-files --quiet &&

    git diff-index --cached --quiet HEAD ||

    die "Working tree is dirty"

}

test -z "$(git rev-parse --show-cdup)" || {

       exit=$?

       echo >&2 "You need to run this command from the toplevel of the working tree."

       exit $exit

}

echo "checking working tree"

require_clean_work_tree

prefix=`basename $tarball .tar.gz`

tmptarball=`mktemp /tmp/webkit-snapshot.tar.XXXXXX` || exit 1

gzip -dc "$tarball" > $tmptarball || exit 1

tarball=$tmptarball

echo "removing unwanted files and directories"

for dir in Tools; do

    echo "    removing $dir"

    tar --delete --file=$tarball $prefix/$dir

done

srcdir=src/3rdparty/webkit

absSrcDir=$PWD/$srcdir

localDiff=

lastImportRevison=

tag=`cat src/3rdparty/webkit/.tag`

echo "replacing $srcdir"

if [  -d $srcdir ]; then

    lastImportRevison=$tag

    git ls-files $srcdir | grep -v src/3rdparty/webkit/include/ | xargs rm

    git ls-files -z src/3rdparty/webkit | git update-index --force-remove -z --stdin

    lastImport=`git rev-list --max-count=1 HEAD -- src/3rdparty/webkit/.tag`

    changes=`git rev-list --no-merges --reverse $lastImport.. -- src/3rdparty/webkit`

    localDiff=/tmp/webkit_patch

    echo -n>$localDiff

    for change in $changes; do

        echo "Saving commit $change"

        git show -p --stat "--pretty=format:%nFrom %H Mon Sep 17 00:00:00 2001%nFrom: %an <%ae>%nDate: %ad%nSubject: Re-apply change $change by %an%n%n%s%n%b%n" $change -- src/3rdparty/webkit >> $localDiff

        echo "-- " >> $localDiff

        echo "1.2.3" >> $localDiff

        echo >> $localDiff

    done

    if [ -s $localDiff ]; then

        echo "Saved locally applied patches to $localDiff"

    else

        localDiff=""

    fi

else

    mkdir -p $srcdir

fi

tar xf $tarball -C $srcdir --strip-components=1

git add $srcdir

git add -f $srcdir/WebKitLibraries/*.a

tag=`cat src/3rdparty/webkit/.tag`

cat >$srcdir/VERSION <<EOT

This is a snapshot of the Qt port of WebKit from

        git://gitorious.org/qtwebkit/qtwebkit.git

and has the sha1 checksum

        $tag

EOT

git add $srcdir/VERSION

git diff-files --name-only -z | git update-index --remove -z --stdin

rm -f $tarball

cat >commitlog.txt <<EOT

Updated WebKit to $tag

EOT

#if [ -d "$repository/.git" -a -n "$lastImportRevison" ]; then

#    echo >>commitlog.txt

#    echo "Changes in WebKit/qt since the last update:" >>commitlog.txt

#    echo >>commitlog.txt

#    git --git-dir=$repository/.git diff $lastImportRevison $rev -- WebKit/qt/ChangeLog | sed -n -e "s,^\+\(.*\),\1,p" >>commitlog.txt

#fi

echo "Changes:"

echo

git --no-pager diff --name-status --cached

echo

echo "Wrote commitlog.txt. Use with"

echo

echo "    git commit -e -F commitlog.txt"

echo

echo "to commit your changes"

if [ -n "$localDiff" ]; then

    echo

    echo "The changes that were locally stored in Perforce are now stored as a git patch in $localDiff"

    echo "You may want to appy them with"

    echo

    echo "    git am -3 $localDiff"

    echo

fi