#----------------------------------*-sh-*--------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | www.openfoam.com
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
#     Copyright (C) 2018-2019 OpenCFD Ltd.
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, licensed under GNU General Public License
#     <http://www.gnu.org/licenses/>.
#
# Script
#     sysFunctions
#
# Description
#     General system helper functions
#
# Functions provided
#     isNone, isSystem, isAbsdir, hasAbsdir
#     isDarwin, isWindows
#     findFirstFile
#     findLibrary
#     findExtLib
#
# Internal variables used
#     extLibraries
#
#------------------------------------------------------------------------------

if [ -z "$WMAKE_SCRIPTS_SYSFUNCTIONS" ]
then
    # Load once, but do not rely on this variable elsewhere
    WMAKE_SCRIPTS_SYSFUNCTIONS=loaded

    # True if OS is Darwin.
    isDarwin()
    {
        test Darwin = "$(uname -s 2>/dev/null)"
    }

    # True if target OS is Windows
    # Uses cached value from libso extension
    isWindows()
    {
        test MSwindows = "$WM_OSTYPE"
    }

    # Static, dynamic library extensions
    extLibraries=".a .so"

    if isDarwin
    then
        extLibraries=".a .dylib"
    elif isWindows
    then
        extLibraries=".a .dll .dll.a"  # including cross-compiling
    fi


    # True if '$1' begins with '/'
    isAbsdir()
    {
        test "$1" = "/${1#/}"
    }


    # True if '$1' begins with '/' and also exists as a directory
    hasAbsdir()
    {
        test "$1" = "/${1#/}" -a -d "$1"
    }


    # True if '$1' is an empty string, "none" or ends in "-none"
    # Eg,
    #    if isNone "$BOOST_ARCH_PATH" ...
    isNone()
    {
        test -z "$1" -o "${1##*-}" = none
    }


    # True if '$1' is "system" or ends in "-system"
    # Eg,
    #    if isSystem "$BOOST_ARCH_PATH"
    isSystem()
    {
        test "${1##*-}" = system
    }


    # Return system prefix (/usr, /usr/local, ...) based on hint provided
    # Eg,
    #    sysPrefix "/usr/local/include/fftw3.h"  -> "/usr/local"
    #
    # Without a hint, echoes "/usr"
    sysPrefix()
    {
        case "$1" in
        /usr/local/*)
            echo "/usr/local"
            ;;
        *)
            echo "/usr"
            ;;
        esac
    }


    # Check existence of any of the files
    # On success, echoes the file found and returns 0, otherwise returns 2
    findFirstFile()
    {
        local file

        for file
        do
            if [ -f "$file" ] && [ -r "$file" ]
            then
                echo "$file"  # Found
                return 0
            fi
        done
        return 2
    }


    # Check existence of library with ending '.a', '.so' ...
    #
    # On success, echoes the resolved file and returns 0, otherwise returns 2
    findLibrary()
    {
        local file ext

        for file
        do
            [ -n "$file" ] || continue
            for ext in '' $extLibraries
            do
                if [ -f "$file$ext" ] && [ -r "$file$ext" ]
                then
                    echo "$file$ext"  # Found
                    return 0
                fi
            done
        done

        return 2
    }


    # Check existence of library in FOAM_EXT_LIBBIN, but conditional
    # on FOAM_EXT_LIBBIN being located in the ThirdParty directory
    #
    # On success, echoes the resolved file and returns 0, otherwise returns 2
    findExtLib()
    {
        local file

        if [ -n "$FOAM_EXT_LIBBIN" ] && \
           [ -n "$WM_THIRD_PARTY_DIR" ] && \
           [ "${FOAM_EXT_LIBBIN#$WM_THIRD_PARTY_DIR}" != "$FOAM_EXT_LIBBIN" ]
        then
            for file
            do
                if file="$(findLibrary "$FOAM_EXT_LIBBIN/$file")"
                then
                    echo "$file"
                    return 0
                fi
            done
        fi

        return 2
    }
fi


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