#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | foam-extend: Open Source CFD
#  \\    /   O peration     |
#   \\  /    A nd           | For copyright notice see file Copyright
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
# License
#     This file is part of foam-extend.
#
#     foam-extend is free software: you can redistribute it and/or modify it
#     under the terms of the GNU General Public License as published by the
#     Free Software Foundation, either version 3 of the License, or (at your
#     option) any later version.
#
#     foam-extend is distributed in the hope that it will be useful, but
#     WITHOUT ANY WARRANTY; without even the implied warranty of
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#     General Public License for more details.
#
#     You should have received a copy of the GNU General Public License
#     along with foam-extend.  If not, see <http://www.gnu.org/licenses/>.
#
# Script
#     foamCleanPath
#
# Description
#     Usage: foamCleanPath [-strip] path [wildcard] .. [wildcard]
#
#     Prints its argument (which should be a ':' separated path)
#     without all
#         - duplicate elements
#         - (if '-strip') non-accessible directories
#         - elements whose start matches a wildcard
#
#     Note:
#         - this routine will fail when directories have embedded spaces
#         - false matches possible if a wildcard contains '.' (sed regex)
#------------------------------------------------------------------------------
if [ "$#" -lt 1 -o "$1" = "-h" -o "$1" = "-help" ]
then
   cat <<USAGE 1>&2
Usage: ${0##*/} [-strip] path [wildcard] .. [wildcard]

    Prints its argument (which should be a ':' separated list) cleansed from
      - duplicate elements
      - elements whose start matches one of the wildcard(s)
      - (if '-strip') non-accessible directories
USAGE
   exit 1
fi


strip=''
if [ "$1" = "-strip" ]
then
    strip=true
    shift
fi


dirList="$1"
shift

##DEBUG echo "input>$dirList<" 1>&2

# preserve current IFS and split on whitespace
oldIFS="$IFS"
IFS=' '

# "wildcard1 ... wildcardN" may have been passed as a single parameter
set -- $*

# strip out wildcards via sed
while [ "$#" -ge 1 ]
do
    wildcard=$1
    shift
    ##DEBUG echo "remove>$wildcard<" 1>&2
    dirList=`echo "$dirList" | sed -e "s@${wildcard}[^:]*:@@g"`
done

# split on ':' (and on space as well to avoid any surprises)
IFS=': '
set -- $dirList

##DEBUG echo "intermediate>$dirList<" 1>&2

# rebuild the list from scratch
unset dirList
for dir
do
    ##DEBUG echo "check>$dir<" 1>&2
    #- dirs must exist
    if [ -e "$dir" ]
    then
        #- no duplicate dirs
        duplicate=`echo " $dirList " | sed -ne "s@ $dir @DUP@p"`

        if [ ! "$duplicate" ]
        then
            dirList="$dirList $dir"
        fi
    elif [ "$strip" != "true" ]
    then
        # Print non-existing directories if not in 'strip' mode.
        dirList="$dirList $dir"
    fi
done

# parse on whitespace
IFS=' '
set -- $dirList

# join on ':'
IFS=':'
dirList="$*"

# restore IFS
IFS="$oldIFS"

##DEBUG echo "output>$dirList<" 1>&2
echo "$dirList"

# -----------------------------------------------------------------------------