--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util/harfbuzz/update-harfbuzz	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,63 @@
+#!/bin/bash
+
+set -e
+
+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"
+}
+
+branch=master
+
+if [ $# = 1 ]; then
+    repo=$1
+elif [ $# = 2 ]; then
+    repo=$1
+    branch=$2
+else
+    echo "usage: $0 <path to local harfbuzz repository> [branch]"
+    exit 1
+fi
+
+if [ ! -r $repo/.git ]; then
+    echo "The provided path $repo does not point to a git repository."
+    exit 2
+fi
+
+test -z "$(git rev-parse --show-cdup)" || {
+       exit=$?
+       echo >&2 "You need to run this command from the toplevel of the working tree."
+       exit $exit
+}
+
+require_clean_work_tree
+
+url=`git --git-dir=$repo/.git config remote.origin.url`
+
+git ls-files src/3rdparty/harfbuzz | git update-index --force-remove --stdin
+
+git fetch $repo $branch
+
+commit=`git rev-parse FETCH_HEAD`
+tree=`git cat-file commit FETCH_HEAD|grep "^tree" | awk '{print $2}'`
+
+git read-tree --prefix=src/3rdparty/harfbuzz $tree
+
+git checkout src/3rdparty/harfbuzz
+
+git status
+
+cat >commitlog.txt <<EOT
+Updated Harfbuzz from $url to $commit
+EOT
+
+echo
+echo "Wrote commitlog.txt. Use with"
+echo
+echo "    git commit -e -F commitlog.txt"
+echo
+echo "to commit your changes"