#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
#    \\/     M anipulation  | Copyright (C) 2017 OpenCFD Ltd.
#-------------------------------------------------------------------------------
# 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
#     foamEtcFile
#
# Description
#     Locate user/group/shipped file with semantics similar to the
#     ~OpenFOAM/fileName expansion.
#
#     The -mode option can be used to allow chaining from
#     personal settings to site-wide settings.
#
#     For example, within the user ~/.OpenFOAM/<VER>/prefs.sh:
#     \code
#        foamFile=$(foamEtcFile -mode go prefs.sh) && . $foamFile
#     \endcode
#
# Note
#     This script must exist in $FOAM_INST_DIR/OpenFOAM-<VERSION>/bin/
#     or $FOAM_INST_DIR/openfoam<VERSION>/bin/ (for the debian version)
#
#-------------------------------------------------------------------------------
unset optQuiet optSilent
usage() {
    [ "${optQuiet:-$optSilent}" = true ] && exit 1

    exec 1>&2
    while [ "$#" -ge 1 ]; do echo "$1"; shift; done
    cat<<USAGE

Usage: ${0##*/} [OPTION] fileName
       ${0##*/} [OPTION] -list
options:
  -a, -all          return all files (otherwise stop after the first match)
  -l, -list         list the directories to be searched
  -m, -mode MODE    any combination of u(user), g(group), o(other)
  -p, -prefix DIR   specify an alternative installation prefix
  -q, -quiet        suppress all normal output
  -s, -silent       suppress all stderr output
  -v, -version VER  specify an alternative OpenFOAM version (eg, 3.0, 1612, ...)
  -help             print the usage

  Locate user/group/shipped file with semantics similar to the
  ~OpenFOAM/fileName expansion.

  Many options can be specified as a single character, but must not be grouped.

  Exit status
      0  when the file is found. Print resolved path to stdout.
      1  for miscellaneous errors.
      2  when the file is not found.

USAGE
    exit 1
}
#-------------------------------------------------------------------------------

# The bin dir:
binDir="${0%/*}"

# The project dir:
projectDir="${binDir%/bin}"

# The prefix dir (same as $FOAM_INST_DIR):
prefixDir="${projectDir%/*}"

# The name used for the project directory
projectDirName="${projectDir##*/}"

# versionNum used for debian packaging
unset version versionNum

#
# Handle standard and debian naming conventions
# - set version (always) and versionNum (debian only)
#
case "$projectDirName" in
OpenFOAM-*)         # standard naming: OpenFOAM-<VERSION>
    version="${projectDirName##OpenFOAM-}"
    ;;

openfoam[0-9]* | openfoam-dev)     # debian naming: openfoam<VERSION>
    versionNum="${projectDirName##openfoam}"
    case "${#versionNum}" in
    (2|3|4) # Convert digits version number to decimal delineated
        version=$(echo "$versionNum" | sed -e 's@\([0-9]\)@\1.@g')
        version="${version%.}"
        ;;

    (*) # Fallback - use current environment setting
        version="$WM_PROJECT_VERSION"
        ;;
    esac
    ;;

*)
    echo "${0##*/} Error : unknown/unsupported naming convention" 1>&2
    exit 1
    ;;
esac


# Default mode is always 'ugo'
mode=ugo
unset optAll optList

# parse options
while [ "$#" -gt 0 ]
do
    case "$1" in
    -h | -help)
        usage
        ;;
    -a | -all)
        optAll=true
        ;;
    -l | -list)
        optList=true
        ;;
    -mode=[ugo]*)
        mode="${1#-mode=}"
        ;;
    -prefix=/*)
        prefixDir="${1#-prefix=}"
        prefixDir="${prefixDir%/}"
        ;;
    -version=*)
        version="${1#-version=}"
        # convert x.y.z -> xyz version (if installation looked like debian)
        if [ -n "$versionNum" ]
        then
            versionNum=$(echo "$version" | sed -e 's@\.@@g')
        fi
        ;;
    -m | -mode)
        mode="$2"
        # Sanity check. Handles missing argument too.
        case "$mode" in
        [ugo]*)
            ;;
        *)
            usage "invalid mode '$mode'"
            ;;
        esac
        shift
        ;;
    -p | -prefix)
        [ "$#" -ge 2 ] || usage "'$1' option requires an argument"
        prefixDir="${2%/}"
        shift
        ;;
    -q | -quiet)
        optQuiet=true
        ;;
    -s | -silent)
        optSilent=true
        ;;
    -v | -version)
        [ "$#" -ge 2 ] || usage "'$1' option requires an argument"
        version="$2"
        # convert x.y.z -> xyz version (if installation looked like debian)
        if [ -n "$versionNum" ]
        then
            versionNum=$(echo "$version" | sed -e 's@\.@@g')
        fi
        shift
        ;;
    --)
        shift
        break
        ;;
    -*)
        usage "unknown option: '$1'"
        ;;
    *)
        break
        ;;
    esac
    shift
done

# Update projectDir accordingly
if [ -n "$versionNum" ]
then
    projectDir="$prefixDir/openfoam$versionNum"                 # debian
else
    projectDir="$prefixDir/${WM_PROJECT:-OpenFOAM}-$version"    # standard
fi


# debugging:
# echo "Installed locations:"
# for i in projectDir prefixDir projectDirName version versionNum
# do
#     eval echo "$i=\$$i"
# done


# Save the essential bits of information
# silently remove leading ~OpenFOAM/ (used in Foam::findEtcFile)
nArgs=$#
fileName="${1#~OpenFOAM/}"

# Define the various places to be searched:
unset dirList
case "$mode" in (*u*)   # user
    dir="$HOME/.${WM_PROJECT:-OpenFOAM}"
    dirList="$dirList $dir/$version $dir"
    ;;
esac

case "$mode" in (*g*)   # group (site)
    dir="${WM_PROJECT_SITE:-$prefixDir/site}"
    dirList="$dirList $dir/$version $dir"
    ;;
esac

case "$mode" in (*o*)   # other (shipped)
    dirList="$dirList $projectDir/etc"
    ;;
esac
set -- $dirList


#
# The main routine
#

exitCode=0
if [ "$optList" = true ]
then

    # list directories, or potential file locations
    [ "$nArgs" -le 1 ] || usage

    # a silly combination, but -quiet does have precedence
    [ "$optQuiet" = true ] && exit 0

    for dir
    do
        if [ "$nArgs" -eq 1 ]
        then
            echo "$dir/$fileName"
        else
            echo "$dir"
        fi
    done

else

    [ "$nArgs" -eq 1 ] || usage

    # general error, eg file not found
    exitCode=2

    for dir
    do
        if [ -f "$dir/$fileName" ]
        then
            exitCode=0
            [ "$optQuiet" = true ] && break

            echo "$dir/$fileName"
            [ "$optAll" = true ] || break
        fi
    done

fi


exit $exitCode

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