#!/bin/bash
#------------------------------------------------------------------------------
# =========                 |
# \\      /  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
#     wmakeLnInclude
#
# Usage
#     wmakeLnInclude [-u | -update] [-s | -silent] <dir>
#
# Description
#     Link all the source files in the <dir> directory into <dir>/lnInclude
#
#     The desired source files:
#         *.C *.H *.h *.cpp *.cxx *.hpp *.hxx
#
#     Avoid
#         *.c (C source)
#
#------------------------------------------------------------------------------
Script=${0##*/}

usage() {
    cat<<USAGE

Usage: $Script [OPTION] [dir]

options:
  -update | -u      update
  -silent | -s      use 'silent' mode (do not echo command)
  -help   | -h      print the usage

    Link all the source files in the <dir> into <dir>/lnInclude

Note
    The '-u' option forces an update when the lnInclude directory already exists
    and changes the default linking from 'ln -s' to 'ln -sf'.

USAGE
}

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

#------------------------------------------------------------------------------
# Parse arguments and options
#------------------------------------------------------------------------------

# Default 'ln' option
lnOpt="-s"

unset update silentOpt

while [ "$#" -gt 0 ]
do
    case "$1" in
        -h | -help)   # Provide immediate help
            usage && exit 0
            ;;
        -u | -update)
            update=true
            lnOpt="-sf"
            shift
            ;;
        -s | -silent)
            silentOpt=true
            shift
            ;;
        -*)
            error "unknown option: '$*'"
            ;;
        *)
            break
            ;;
    esac
done

if [ $# -eq 1 ]
then
    baseDir=$1
else
    error "Error: incorrect number of arguments"
fi


# Convert incorrect path/dir/lnInclude to something sensible
while [ "${baseDir##*/}" = lnInclude ]
do
    baseDir="${baseDir%/*}"
    if [ "$baseDir" = lnInclude ]
    then
        baseDir="."
    fi
done
incDir="$baseDir"/lnInclude


[ -d "$baseDir" ] || {
    echo "$Script error: base directory $baseDir does not exist" 1>&2
    exit 2
}

if [ -d "$incDir" ]
then
    [ "$update" = true ] || exit 0
else
    mkdir "$incDir"
fi

[ -d "$incDir" ] || {
    echo "$Script error: failed to create include directory $incDir" 1>&2
    exit 0
}

cd "$incDir" || exit 1

if [ "$silentOpt" = true ] || [ -n "$WM_QUIET" ]
then
    echo "    ln: $incDir"
else
    echo "$Script: linking include files to $incDir"
fi


#------------------------------------------------------------------------------
# Remove any broken links first (this helps when file locations have moved)
#------------------------------------------------------------------------------
find -L . -type l -print0 | xargs -0 rm -f


#------------------------------------------------------------------------------
# Create links. Avoid recreating links unless necessary. Files in lnInclude,
# Make, config and noLink are ignored, as is anything within a sub-library.
#------------------------------------------------------------------------------

filter()
{
    kind="$1"
    shift

    while [ "$#" -gt 1 ]
    do
        echo "-$kind" && echo "$1"
        shift
        echo "-o"
    done

    echo "-$kind" && echo "$1"
    shift
}

mapfile -t pruneNames < <(filter name lnInclude Make config noLink)
mapfile -t prunePaths < <(find .. -mindepth 2 -type d -name Make -printf '%h\n')
mapfile -t prunePaths < <(filter path "${prunePaths[@]}")
mapfile -t matchNames < <(filter name '*.[CHh]' '*.[ch]xx' '*.[ch]pp' '*.type')

find .. \
    \( "${pruneNames[@]}" -o "${prunePaths[@]}" \) -prune \
    -o \( "${matchNames[@]}" \) \
    -exec ln $lnOpt {} . \;


#------------------------------------------------------------------------------
# Cleanup local variables and functions
#------------------------------------------------------------------------------

unset Script usage error


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