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#!/usr/bin/env bash
#===----------------------------------------------------------------------===#
#
# This source file is part of the Swift.org open source project
#
# Copyright (c) 2014 - 2019 Apple Inc. and the Swift project authors
# Licensed under Apache License v2.0 with Runtime Library Exception
#
# See https://swift.org/LICENSE.txt for license information
# See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
#
#===----------------------------------------------------------------------===#
# SYNOPSIS
# format-diff.sh FILE [OPTION]...
#
# DESCRIPTION
# Runs the formatter and displays a side-by-side diff of the original file
# and the formatted results. The script will use `colordiff` for the output
# if it is present; otherwise, regular `diff` will be used.
#
# The first argument to this script must be the `.swift` source file to be
# formatted. Any remaining arguments after that will be passed directly to
# `swift-format`.
set -euo pipefail
SRCFILE="$1" ; shift
# Use `colordiff` if it's present; otherwise, fall back to `diff`.
if which colordiff >/dev/null ; then
DIFF="$(which colordiff)"
else
DIFF="$(which diff)"
fi
# Make sure the formatter is built in debug mode so we can reference the
# executable easily.
swift build --product swift-format
# Run a side-by-side diff with the original source file on the left and the
# formatted output on the right.
"$DIFF" -y -W 210 "$SRCFILE" <(.build/debug/swift-format "$@" "$SRCFILE")
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