arc_preview
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	• sshannin
	Mar 4 2015, 6:33 PM

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arc_preview
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	#!/bin/bash

	set -e

	usage ()
	{
	echo "Usage: arc_preview [ -d Diff ID ]"
	echo ""
	echo "Will detect your local arc Diff ID and your local svn repo"
	echo "to provide a diff of what has changed. This semantically"
	echo "should tell you what has changed since your last 'arc diff'."
	echo "If -d is provided, it will be used as the Diff ID rather than"
	echo "detecting and using your most recent diff."
	exit 1
	}

	diff=""
	while getopts ":d:" opt; do
	case "$opt" in
	d) diff=$OPTARG
	;;
	*)
	usage
	;;
	esac
	done

	if [ -z "$diff" ];
	then
	diff=`arc which \| grep -o "D[1-9][0-9]*"`
	fi
	base_checkout=`svn info \| grep ^URL \| cut -d" " -f2`

	if [ -z "$diff" ];
	then
	echo "Unable to find diff for working directory"
	exit
	fi

	if [ -z "$base_checkout" ];
	then
	echo "Unable to find svninfo for working directory"
	exit
	fi

	echo "Diff is $diff"
	echo "Base Revision is $base_checkout"

	curr_dir=`pwd`

	## start with a fresh tmp dir
	tmp_dir=`mktemp -d`

	function cleanup {
	rm -rf $tmp_dir
	}

	trap 'cleanup' EXIT

	## checkout the base revision and apply the patch
	svn co $base_checkout $tmp_dir --quiet
	cd $tmp_dir

	## patch it up and hide some noise
	arc patch --force ${diff} \| grep -v "^patching file" \|
	grep -v "^[A\|U\|D] "

	cd $curr_dir

	## perform our diff
	diff -ru $tmp_dir $curr_dir --exclude=".svn"