#!/bin/sh
# update a version controlled directory, but only if the local
# copy doesn't have problems (locally modified, wrong type, etc.)

if [ $# -ge 1 ]; then
	# update the specified files and/or directories
	dirs="$*"
else
	# update the current directory
	dirs="$PWD"
fi

error()
{
	echo "$*" 1>&2
}

is_dir()
{
	test -d "$1"
}

have_svn()
{
	type svn >/dev/null 2>&1
}

under_svn()
{
	svn info "$1" >/dev/null 2>&1
}

modified()
{
	typeset dir
	path="$1"

	lines=$(svn stat "$path" | wc -l)
	if [ $? -eq 0 ]; then
		if [ -n "$lines" ]; then
			if [ $lines -ne 0 ]; then
				svn stat "$path"
				return 1
			else
				return 0
			fi
		else
			error "Unknown number of lines in output"
			return 1
		fi
	else
		error "Error getting svn status for $path"
		return 1
	fi
}

for path in $paths; do
	if have_svn; then
		if under_svn "$path"; then
			if ! modified "$path"; then
				svn up "$path"
				if [ $? -eq 0 ]; then
					# success
					continue
				else
					error "Error updating $path"
					continue
				fi
			else
				if [ -f "$path" ]; then
					error "$path is modified (or a similar problem)"
				else
					error "$path has modified files (or a similar problem)"
				fi
				exit 1
			fi
		else
			error "$path is not under Subversion"
			exit 1
		fi
	else
		error "svn is not installed"
		exit 1
	fi
done