[hunspell] Script to automatically generate google.patch

update_google_patch.sh

Index: update_google_patch.sh
diff --git a/update_google_patch.sh b/update_google_patch.sh
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+++ b/update_google_patch.sh
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+#!/bin/bash
+
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Creates an updated google.patch that reflects all checked-in changes in the
+# current branch. To do this, it
+# 1) Checks out the baseline from CVS into a separate /tmp directory.
+# 2) Applies all changes third_party/hunspell had since baseline to the CVS dir.
+#    2a) Applying google.patch at current branches upstream revision
+#    2b) Applying all changes made in the current branch since upstream
+# 3) Diffs the updated CVS dir against the checkout made in 1)
+#
+# No files in the current branch except google.patch will be modified, and
+# applying google.patch to the CVS baseline catches baseline up to
+# third_party/hunspell.
+
+cvs_dir=""
+tempfiles=( )
+tmplate="/tmp/`basename $0`.XXXXXX"
+
+# Cleanup function to be executed whenever the script exits.
+function cleanup() {
+  if [[ $cvs_dir ]]; then
+    rm -r "${cvs_dir}"
+  fi
+
+  if [[ ${tempfiles[@]} ]]; then
+    rm "${tempfiles[@]}"
+  fi
+  cd ${starting_dir}
+}
+trap cleanup 0
+
+# Generate a temp file and register it for cleanup
+function tempfile() {
+  local result=$1
+  local tmpfile=$(mktemp ${tmplate}) || exit 1
+  tempfiles+=( "${tmpfile}" )
+  eval $result="'$tmpfile'"
+}
+
+starting_dir=$(pwd)
+hunspell_dir=$(dirname $(readlink -e $0))
+
+# Temp file with a list of all excluded files
+tempfile filter_file
+cat << EOF > ${filter_file}
+google.patch
+update_google_patch.sh
+README.chromium
+EOF
+
+# List of all files changed relative to upstream in current branch.
+changed_files=$(git --no-pager diff @{u} --name-status | grep -vf ${filter_file} )
+
+# Check we don't actually have files that are added or deleted, because
+# that can't be handled by the read-only CVS checkout.
+added_files=$( echo "${changed_files}" | grep "^A")
+if [[ ${added_files} ]] ; then
+  echo "Script cannot handle added files"
+  exit 1
+fi
+deleted_files=$( echo "${changed_files}" | grep "^D")
+if [[ ${deleted_files} ]] ; then
+  echo "Script cannot handle deleted files"
+  exit 1
+fi
+
+# Generate patch between branch point from upstream and current HEAD.
+diff_files=$( echo "${changed_files}" | grep "^M" | cut -f1 --complement )
+tempfile local_patch_file
+echo "${diff_files}" | xargs -IXX git --no-pager diff --no-prefix @{u} -- XX > ${local_patch_file}
+
+# Create copy of google.patch at branch point version.
+tempfile google_patch_file
+git show @{u}:google.patch > ${google_patch_file}
+
+# Create a temporary checkout for CVS hunspell's baseline. All further work
+# will happen in this temp directory.
+cvs_dir=$(mktemp -d ${tmplate}) || exit 1
+
+# Get CVS hunspell baseline.
+cd ${cvs_dir}
+echo Checking out CVS version.
+cvs -z3 \
+  -qd:pserver:anonymous@hunspell.cvs.sourceforge.net:/cvsroot/hunspell \
+  co -D "23 Mar 2012" -P hunspell
+
+# Apply google.patch and changes in current branch to CVS hunspell baseline.
+cd hunspell
+echo Applying google.patch.
+patch -p0 -i ${google_patch_file}
+echo Applying local patch.
+patch -p0 -i ${local_patch_file}
+
+# And generate a new google.patch by diffing modified CVS hunspell against CVS
+# hunspell baseline.
+echo Updating google.patch.
+cvs -q diff -u > ${hunspell_dir}/google.patch
+