Git bisect for SVN

.bashrc.sh

function svn-bisect() {
	local TEST="$1"
	local TARGET="${2:-.}"
	local LEFT=${3:-1}
	local RIGHT=${4:-$(LANG=LC svn info | grep ^Revision | sed 's/Revision: //')}

	if ! echo "$LEFT" | grep '^[0-9]\+$' > /dev/null; then
		echo 'Starting revision must be a valid number' >&2
		exit 1
	fi
	if ! echo "$RIGHT" | grep '^[0-9]\+$' > /dev/null; then
		echo 'Ending revision must be a valid number' >&2
		exit 1
	fi

	if [ $RIGHT -le $LEFT ]; then
		echo 'Ending revision must be greater than starting revision' >&2
		exit 2
	fi

	if ! (svn status "$TARGET" --ignore-externals) 2> /dev/null; then
		echo 'Invalid target' >&2
		exit 3
	fi

	if [ "$(svn status "$TARGET" --ignore-externals)" != "" ]; then
		echo 'Target has local changes: cleanup your working copy before bisect' >&2
		exit 4
	fi

	function test_rev() {
		echo "Testing $1…" >&2
		svn up --force --accept=theirs-full -r $1 "$TARGET" > /dev/null
		if eval "$TEST"; then
			echo "PASS: $1"
			return 0
		else
			echo "FAIL: $1"
			return 1
		fi
	}

	local MIDDLE=
	function advance_rev() {
		MIDDLE=$((($LEFT+$RIGHT)/2))
		if [ $MIDDLE = $LEFT ]; then
			return 1;
		fi
	}


	if (test_rev $RIGHT); then
		echo "Already working at ending revision" >&2
		echo "Hint: You should provide an ending revision that fails." >&2
		echo $RIGHT
		exit 0
	fi

	if ! (test_rev $LEFT); then
		echo "Not working at starting revision" >&2
		echo "You must provide an starting revision that does not fail." >&2
		exit 255
	fi

	while advance_rev; do
		if test_rev $MIDDLE; then
			LEFT=$MIDDLE
		else
			RIGHT=$MIDDLE
		fi
	done

	echo "Latest successful revision found:" >&2
	echo "$RIGHT"
}

example.txt

A method of a class I knew previously existed suddenly disappeared. Dafuq ?
The test to check if method exists will be: "grep 'n myMethod' /path/to/class.php"
The target to update is "/path/to/class.php"
To revision when I implemented the function (I therefore know it exists there) is 13921
Current HEAD is 14345

$ svn-bisect "grep 'n myMethod' /path/to/class.php > /dev/null" /path/to/class.php 13921
Testing 14345…
FAIL: 14345
Testing 13921…
PASS: 13921
Testing 14133…
FAIL: 14133
Testing 14027…
FAIL: 14027
Testing 13974…
PASS: 13974
Testing 14000…
PASS: 14000
Testing 14013…
FAIL: 14013
Testing 14006…
FAIL: 14006
Testing 14003…
FAIL: 14003
Testing 14001…
PASS: 14001
Testing 14002…
FAIL: 14002
Latest successful revision found:
14002



Time to execute: ~ 10 seconds
Time saved: ~ 2 hours :)

usage.sh

`svn-bisect $TEST $TARGET [$START [$END]]`