#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     | Website:  https://openfoam.org
#   \\  /    A nd           | Copyright (C) 2011-2024 OpenFOAM Foundation
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM.
#
#     OpenFOAM 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.
#
#     OpenFOAM 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 OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
#
# Script
#     foamCleanPath
#
# Description
#     Usage: foamCleanPath [-strip] path [exp1] .. [expN]
#
#     Returns the <path> with individual paths removed which match partially or
#     fully any expressions [exp1] ... [expN] provided.
#
#------------------------------------------------------------------------------
usage() {
    cat <<USAGE
Usage: ${0##*/} [OPTION] "<path>" [exp1] .. [expN]
options:
  -help             print the usage

Returns the <path> with individual paths removed which match partially or fully
any expressions [exp1] ... [expN] provided.

+ The <path> must be a single quoted "" string with directory paths, separated
  by colons.
+ Each [exp1] ... [expN] may be a single expression or a colon-separated set of
  expressions.

USAGE
}

error() {
    exec 1>&2
    while [ "$#" -ge 1 ]; do echo "$1" >&2; shift; done
    usage
    exit 1
}

strip=
while [ "$#" -gt 0 ]
do
    case "$1" in
    -h | -help)
        usage && exit 0
        ;;
    -*)
        error
        ;;
    *)
        break
        ;;
    esac
done
[ "$#" -ge 1 ] || error "No arguments provided"

oldPath="$1" ; shift

# Quick exit if oldPath is not set, needed for LD_LIBRARY_PATH
[ -n "$oldPath" ] || exit

exps="$(echo "$*" | awk -F '[: ]' '{for(i=1;i<=NF;i++) print $i}')"

# standard directories on PATH, e.g. /bin, /usr/bin
stdPaths="$(getconf PATH)"

for exp in $exps
do
    # do not remove standard directories
    echo "$stdPaths" | grep -qE "(^|:)$exp(:|$)" && continue

    oldPath=$(echo "$oldPath" | \
        sed -e "s|${exp}[^:]*:||g" | \
        sed -e "s|:${exp}[^:]*$||g" )
done

oldIFS=$IFS
IFS=:
newPath=
for dir in $oldPath
do
    # Ignore duplicates
    echo "$newPath" | grep -qE "(^|:)$dir(:|$)" && continue

    # Clean the dir if it exists
    [ -d "$dir" ] && dir="$(cd "$dir" && pwd)"

    # Add an entry, without a colon for first time
    [ "$newPath" ] && newPath="$newPath:$dir" && continue
    newPath="$dir"
done
IFS=$oldIFS

echo "$newPath"

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