$ cat ~/bin/sync_namespace
#!/bin/bash

# replace performs a string replacement for all files in the repo under the
# current folder and is defined as:
#
#     git grep -l "$1" | xargs sed -i "s/$1/$2/g"

UPSTREAM=$(git rev-parse --abbrev-ref HEAD@{upstream})

echo "Cleaning up..."
git reset --hard $UPSTREAM

cd components/sync

# Fix namespace opening and closing.
replace "namespace syncer_v2 {" "namespace syncer {"
replace "namespace sync_driver_v2 {" "namespace syncer {"
replace "namespace sync_driver {" "namespace syncer {"
replace "namespace browser_sync {" "namespace syncer {"
replace "}  \/\/ namespace syncer_v2" "}  \/\/ namespace syncer"
replace "}  \/\/ namespace sync_driver_v2" "}  \/\/ namespace syncer"
replace "}  \/\/ namespace sync_driver" "}  \/\/ namespace syncer"
replace "}  \/\/ namespace browser_sync" "}  \/\/ namespace syncer"

# Remove unnecessary namespace identifiers. This is a big hammer that
# I cleaned up after in the manual tweaks.
replace "syncer_v2::" ""
replace "syncer::" ""
replace "sync_driver_v2::" ""
replace "sync_driver::" ""
replace "browser_sync::" ""

# Get rid of using statements that are no longer needed.
erase_line "^using [A-Z]\w*;"

cd -

# Files where "syncer::" was actually needed.
git checkout components/sync/base/data_type_histogram.h
git checkout components/sync/base/immutable_unittest.cc
git checkout components/sync/base/logging.h
git checkout components/sync/syncable/directory.h
git checkout components/sync/test/fake_server
git checkout components/sync/tools/testserver/run_sync_testserver.cc

# Clean up namespace identifies outside //components/sync.
replace "syncer_v2::" "syncer::"
replace "sync_driver_v2::" "syncer::"
replace "sync_driver::" "syncer::"

echo "Formatting..."
git cl format

echo "Commiting automated changes..."
git commit --all -m "Automated changes." > /dev/null

echo "Cherry-picking manual changes..."
git cherry-pick 3c060e2