foamEtcFile

#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     | Website:  https://openfoam.org
#   \\  /    A nd           | Copyright (C) 2011-2018 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
#     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
#        foamPrefs=`$WM_PROJECT_DIR/bin/foamEtcFile -m go prefs.sh` \
#            && _foamSource $foamPrefs
#     \endcode
#
# Note
#     This script must exist in $FOAM_INST_DIR/OpenFOAM-<VERSION>/bin/
#     or $FOAM_INST_DIR/openfoam<VERSION>/bin/ (for the debian version)
#
#------------------------------------------------------------------------------
usage() {
    cat<<USAGE

Usage: ${0##*/} [OPTION] fileName
options:
  -all              return all files (otherwise stop after the first match)
  -list             list the directories to be searched
  -mode <mode>      any combination of u(user), g(group), o(other)
  -prefix <dir>     specify an alternative installation prefix
  -quiet            suppress all normal output
  -silent           suppress all stderr output
  -version <ver>    specify an alternative OpenFOAM version
                    in the form Maj.Min.Rev (eg, 1.7.0)
  -help             print the usage

Searches for OpenFOAM configuration files, that are generally found in the
installation "etc" directory, but can be located in the following locations,
listed in order of precedence:
- user level: \${HOME}/.OpenFOAM
- group level: \$FOAM_INST_DIR/site
- other level: \$WM_PROJECT_DIR/etc

The options can also be specified as a single character
(eg, '-q' instead of '-quiet'), 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
}

error() {
    [ "${optQuiet:-$optSilent}" = true ] && exit 1

    exec 1>&2
    while [ "$#" -ge 1 ]; do echo "$1"; shift; done
    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##*/}"

# version number used for debian packaging
unset versionNum

#
# handle standard and debian naming convention
#
case "$projectDirName" in
OpenFOAM-*)         # standard naming convention OpenFOAM-<VERSION>
    version="${projectDirName##OpenFOAM-}"
    ;;

openfoam[0-9]* | openfoam-dev)     # debian naming convention 'openfoam<VERSION>'
    versionNum="${projectDirName##openfoam}"
    case "$versionNum" in
    ??)         # convert 2 digit version number to decimal delineated
        version=$(echo "$versionNum" | sed -e 's@\(.\)\(.\)@\1.\2@')
        ;;
    ???)        # convert 3 digit version number to decimal delineated
        version=$(echo "$versionNum" | sed -e 's@\(.\)\(.\)\(.\)@\1.\2.\3@')
        ;;
    ????)       # convert 4 digit version number to decimal delineated
        version=$(echo "$versionNum" | sed -e 's@\(.\)\(.\)\(.\)\(.\)@\1.\2.\3.\4@')
        ;;
    *)          # failback - use current environment setting
        version="$WM_PROJECT_VERSION"
        ;;
    esac
    ;;

*)
    echo "Error : unknown/unsupported naming convention"
    exit 1
    ;;
esac


# default mode is 'ugo'
mode=ugo
unset optAll optList optQuiet optSilent

# parse options
while [ "$#" -gt 0 ]
do
    case "$1" in
    -h | -help)
        usage && exit 0
        ;;
    -a | -all)
        optAll=true
        ;;
    -l | -list)
        optList=true
        ;;
    -m | -mode)
        [ "$#" -ge 2 ] || error "'$1' option requires an argument"
        mode="$2"

        # sanity check:
        case "$mode" in
        *u* | *g* | *o* )
           ;;
        *)
           error "'$1' option with invalid mode '$mode'"
           ;;
        esac
        shift
        ;;
    -p | -prefix)
        [ "$#" -ge 2 ] || error "'$1' option requires an argument"
        prefixDir="$2"
        shift
        ;;
    -q | -quiet)
        optQuiet=true
        ;;
    -s | -silent)
        optSilent=true
        ;;
    -v | -version)
        [ "$#" -ge 2 ] || error "'$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
        ;;
    -*)
        error "unknown option: '$*'"
        ;;
    *)
        break
        ;;
    esac
    shift
done


# 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 "$mode" in
*u*)  # user
    userDir="$HOME/.${WM_PROJECT:-OpenFOAM}"
    dirList="$dirList $userDir/$version $userDir"
    ;;
esac

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

case "$mode" in
*o*)  # other (shipped)
    if [ -n "$versionNum" ]
    then
        # debian packaging
        dirList="$dirList $prefixDir/openfoam$versionNum/etc"
    else
        # standard packaging
        dirList="$dirList $prefixDir/${WM_PROJECT:-OpenFOAM}-$version/etc"
    fi
    ;;
esac
set -- $dirList


#
# The main routine
#

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

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

    # 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 ] || error

    # general error, eg file not found
    exitCode=2

    for dir
    do
        if [ -f "$dir/$fileName" ]
        then
            exitCode=0
            if [ "$optQuiet" = true ]
            then
                break
            else
                echo "$dir/$fileName"
                [ "$optAll" = true ] || break
            fi
        fi
    done

fi


exit $exitCode

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