#!/bin/bash

type -p gsed >/dev/null && SED=gsed || SED=sed
type -p greadlink > /dev/null && READLINK=greadlink || READLINK=readlink

# Packs arguments into a single string.
#
# Input:
#   $1 = name of variable receiving the arguments in such a way that
#        (re)evaluating them provides the original arguments
#   $2... = arguments
# Example:
#   func() {
#     send_rpc func_impl "$(pack_args "$@")"
#   }
#   # (in another process)
#   receive_rpc() {
#     local func="$1"
#     local args="$2"
#     eval $func "$args"
#   }
pack_args()
{
    local _p _result=
    for _p
    do
        _result="$_result '$(echo -n "$_p" | sed "s/'/'\"'\"'/g")'"
    done
    echo "$_result"
}

# $1 = compressed list of revisions
expand_list()
{
	local revs=
	local rev
	for rev in $1
	do
		if echo "$rev" | grep -q -- "-"
		then
			local oldifs="$IFS"
			IFS="-"
			set -- $rev
			IFS="$oldifs"
			revs+=$(seq $1 $2 | tr '\n' ' ')
		else
			revs+="$rev "
		fi
	done
	echo "${revs% }"
}

# $1 = list of source revisions
# $2 = list of revisions to delete from the first list
subtract_list()
{
	grep -Fvx "${2// /$'\n'}" <<< "${1// /$'\n'}"
}

# sorts a list of elements
# $1 = list of elements
sort_list()
{
	$SED 's/ /\n/g' <<< "$1" | sort -u | $SED 's/\n/ /g'
}

# returns the minimum revision
# $1 = list of revisions
min_rev()
{
	$SED 's/ /\n/g' <<< "$1" | sort -nu | $SED '/^$/d' | head -n 1
}

# returns the maximum revision
# $1 = list of revisions
max_rev()
{
	$SED 's/ /\n/g' <<< "$1" | sort -nu | tail -n 1
}

# $1 = string to be used verbatim within a regular expression delimited by ""
mask_for_regex()
{
	echo "$@" | $SED -e 's/\\/\\\\\\\\/g;s/\([][^*$]\)/\\\\\1/g'
}

# set pipefail as the svn module relies on it!
# see http://stackoverflow.com/questions/6871859/
set -o pipefail