#----------------------------------*-sh-*--------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 2015-2016 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
#     wmakeFunctions
#
# Description
#     Functions to check wmake environment and find .dep and .o files
#------------------------------------------------------------------------------

# Ensure these variables are always defined
MakeDir=Make
: ${Script:=wmakeFunctions}


#------------------------------------------------------------------------------
# Check environment variables
#------------------------------------------------------------------------------

checkEnv()
{
    for envar in WM_OPTIONS WM_LINK_LANGUAGE WM_DIR WM_PROJECT_DIR
    do
        eval test "\$$envar" || {
            echo "$Script error: environment variable \$$envar not set" 1>&2
            exit 1
        }
    done
}


#------------------------------------------------------------------------------
# Search up directories tree for the Make sub-directory
#------------------------------------------------------------------------------

# Return the absolute path for a directory or a file's parent directory
# expandPath dirName
# expandPath fileName
#
# Output:
# - the expanded path name
expandPath()
{
    if [ -d "$1" ]
    then
        (cd "$1" && pwd -P)
    elif [ -n "$1" ]
    then
        (cd $(dirname "$1") && pwd -P)
    else
        pwd -P
    fi
}

# Find the target directory, which contains a Make/ directory
# search upwards in its parent directories, but stopping
# when it hits the project root, home, or the file-system root
#
# findTarget dirName
#
# Output:
# - the relative target directory
#
# Global variables used:
# - WM_PROJECT_DIR, HOME
findTarget()
{
    local project=$(expandPath $WM_PROJECT_DIR)
    local home=$(expandPath $HOME)
    local reldir="${1:-.}"
    local absdir=$(expandPath $reldir)

    while [ -n "$absdir" ]
    do
        case "$absdir" in
        ($project | $home | /)
            break
            ;;
        esac

        if [ -d "$reldir/Make" ]
        then
            echo "$reldir"
            return 0
        else
            # Check parent directory
            absdir="${absdir%/*}"
            reldir="$reldir/.."
        fi
    done

    echo "Error: no Make directory for $(expandPath $1)" 1>&2
    echo 1>&2
    return 1
}


# Change to 'MakeDir' parent
# - uses 'MakeDir' for its input
#
# Side-effects:
# - unsets targetType
cdSource()
{
    local dir
    if [ ! -d "$MakeDir" ]
    then
        echo "$Script: '$MakeDir' directory does not exist in $PWD" 1>&2
        echo "    Searching up directories tree for Make directory" 1>&2

        dir=$(findTarget .) || exit 1 # Fatal
        cd $dir 2>/dev/null || {
            echo "$Script error: could not change to directory '$dir'" 1>&2
            exit 1
        }
        unset targetType
    fi

    [ -r $MakeDir/files ] || {
        echo "$Script error: file '$MakeDir/files' does not exist in $PWD" 1>&2
        exit 1
    }
}


# Find the object directory
# findObjectDir dirName
# findObjectDir fileName
#
# Output:
# - the objectsDir
#
# Global variables used:
# - WM_PROJECT_DIR, WM_OPTIONS
findObjectDir()
{
    local project=$(expandPath $WM_PROJECT_DIR)
    local absdir=$(expandPath ${1:-.})
    local objectsDir

    case "$absdir" in
    ("$project"/*)
        local buildPath=$WM_PROJECT_DIR/build/${WM_OPTIONS}
        objectsDir=$buildPath$(echo $absdir | sed s%$project%% )
        ;;
    (*)
        local path=$absdir
        local appDir=.
        [ -d Make ] || appDir=$(findTarget .) || exit 1 # Fatal
        absdir=$(expandPath $appDir/.)
        objectsDir=$appDir/Make/${WM_OPTIONS}$(echo $path | sed s%$absdir%% )
    ;;
    esac

    echo "$objectsDir"
}


# Find the object directory and remove it
# removeObjectDir dirName
# removeObjectDir fileName
#
# Output:
# - NONE
#
# Global variables used:
# - WM_PROJECT_DIR, WM_OPTIONS
removeObjectDir()
{
    local objectsDir=$(findObjectDir ${1:-.})
    if [ -d "$objectsDir" ]
    then
        rm -rf "$objectsDir" > /dev/null 2>&1
    fi
}


# depToSource depFile
#
# Output:
# - the sourceFile corresponding to depFile
#
# Global variables used:
# - WM_OPTIONS
# - WM_MPLIB
if [ -n "$BASH_VERSION" ]
then
    depToSource()
    {
        local sourceFile=${1%.dep}
        sourceFile="${sourceFile/build\/${WM_OPTIONS}\//}"
        sourceFile="${sourceFile/build\/${WM_OPTIONS}${WM_MPLIB}\//}"
        sourceFile="${sourceFile/Make\/${WM_OPTIONS}\//}"
        sourceFile="${sourceFile/Make\/${WM_OPTIONS}${WM_MPLIB}\//}"

        echo "$sourceFile"
    }
else
    depToSource()
    {
        local sourceFile=$(echo ${1%.dep} |             \
            sed -e s%build/${WM_OPTIONS}/%%             \
                -e s%build/${WM_OPTIONS}${WM_MPLIB}/%%  \
                -e s%Make/${WM_OPTIONS}/%%              \
                -e s%Make/${WM_OPTIONS}${WM_MPLIB}/%% )

        echo "$sourceFile"
    }
fi


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