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#!/bin/sh
#
# Copyright (c) 2010 Junio C Hamano.
#

prec=4

read_state () {
onto_name=$(cat "$state_dir"/onto_name) &&
end=$(cat "$state_dir"/end) &&
msgnum=$(cat "$state_dir"/msgnum)
}

continue_merge () {
test -d "$state_dir" || die "$state_dir directory does not exist"

unmerged=$(git ls-files -u)
if test -n "$unmerged"
then
echo "You still have unmerged paths in your index"
echo "did you forget to use git add?"
die "$resolvemsg"
fi

cmt=`cat "$state_dir/current"`
if ! git diff-index --quiet --ignore-submodules HEAD --
then
if ! git commit --no-verify -C "$cmt"
then
echo "Commit failed, please do not call \"git commit\""
echo "directly, but instead do one of the following: "
die "$resolvemsg"
fi
if test -z "$GIT_QUIET"
then
printf "Committed: %0${prec}d " $msgnum
fi
echo "$cmt $(git rev-parse HEAD^0)" >> "$state_dir/rewritten"
else
if test -z "$GIT_QUIET"
then
printf "Already applied: %0${prec}d " $msgnum
fi
fi
test -z "$GIT_QUIET" &&
GIT_PAGER='' git log --format=%s -1 "$cmt"

# onto the next patch:
msgnum=$(($msgnum + 1))
echo "$msgnum" >"$state_dir/msgnum"
}

call_merge () {
cmt="$(cat "$state_dir/cmt.$1")"
echo "$cmt" > "$state_dir/current"
hd=$(git rev-parse --verify HEAD)
cmt_name=$(git symbolic-ref HEAD 2> /dev/null || echo HEAD)
msgnum=$(cat "$state_dir/msgnum")
eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
eval GITHEAD_$hd='$onto_name'
export GITHEAD_$cmt GITHEAD_$hd
if test -n "$GIT_QUIET"
then
GIT_MERGE_VERBOSITY=1 && export GIT_MERGE_VERBOSITY
fi
test -z "$strategy" && strategy=recursive
eval 'git-merge-$strategy' $strategy_opts '"$cmt^" -- "$hd" "$cmt"'
rv=$?
case "$rv" in
0)
unset GITHEAD_$cmt GITHEAD_$hd
return
;;
1)
git rerere $allow_rerere_autoupdate
die "$resolvemsg"
;;
2)
echo "Strategy: $strategy failed, try another" 1>&2
die "$resolvemsg"
;;
*)
die "Unknown exit code ($rv) from command:" \
"git-merge-$strategy $cmt^ -- HEAD $cmt"
;;
esac
}

finish_rb_merge () {
move_to_original_branch
if test -s "$state_dir"/rewritten
then
git notes copy --for-rewrite=rebase <"$state_dir"/rewritten
if test -x "$GIT_DIR"/hooks/post-rewrite
then
"$GIT_DIR"/hooks/post-rewrite rebase <"$state_dir"/rewritten
fi
fi
rm -r "$state_dir"
say All done.
}

case "$action" in
continue)
read_state
continue_merge
while test "$msgnum" -le "$end"
do
call_merge "$msgnum"
continue_merge
done
finish_rb_merge
exit
;;
skip)
read_state
git rerere clear
msgnum=$(($msgnum + 1))
while test "$msgnum" -le "$end"
do
call_merge "$msgnum"
continue_merge
done
finish_rb_merge
exit
;;
esac

mkdir -p "$state_dir"
echo "$onto_name" > "$state_dir/onto_name"
write_basic_state

msgnum=0
for cmt in `git rev-list --reverse --no-merges "$revisions"`
do
msgnum=$(($msgnum + 1))
echo "$cmt" > "$state_dir/cmt.$msgnum"
done

echo 1 >"$state_dir/msgnum"
echo $msgnum >"$state_dir/end"

end=$msgnum
msgnum=1

while test "$msgnum" -le "$end"
do
call_merge "$msgnum"
continue_merge
done

finish_rb_merge
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