#!/bin/bash

# Copyright 2017 Google
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#      http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Usage:
# ./scripts/style.sh [branch-name | filenames]
#
# With no arguments, formats all eligible files in the repo
# Pass a branch name to format all eligible files changed since that branch
# Pass a specific file or directory name to format just files found there
#
# Commonly
# ./scripts/style.sh master

set -euo pipefail

(
  if [[ $# -gt 0 ]]; then
    if git rev-parse "$1" -- >& /dev/null; then
      # Argument was a branch name show files changed since that branch
      git diff --name-only --relative
    else
      # Otherwise assume the passed things are files or directories
      find "$@" -type f
    fi
  else
    # Do everything by default
    find . -type f
  fi
) | sed -E -n '
# Build outputs
\%/Pods/% d
\%^./build/% d

# Sources controlled outside this tree
\%/third_party/% d
\%/Firestore/Port/% d

# Sources within the tree that are not subject to formatting
\%^./(Example|Firebase)/(Auth|AuthSamples|Database|Messaging)/% d

# Checked-in generated code
\%\.pb(objc|rpc)\.% d

# Format C-ish sources only
\%\.(h|m|mm|cc)$% p
' | xargs clang-format -style=file -i