#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | www.openfoam.com
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
#     Copyright (C) 2025 OpenCFD Ltd.
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, distributed under GPL-3.0-or-later.
#
# Script
#     foamGrepLibTargets
#
# Description
#     List library targets (contain "LIB_LIBS =")
#
#------------------------------------------------------------------------------
# Locations
FOAM_GIT_DIR="$WM_PROJECT_DIR/.git"

printHelp() {
    cat<<USAGE

usage: ${0##*/}
  -no-git       Disable use of git for obtaining information
  -app          Search applications/solvers/ applications/utilities/
  -src          Search src/
  -no-git       Disable use of git for obtaining information
  -help         Print the usage

List library targets (contains LIB_LIBS). Uses git when possible

USAGE
    exit 0  # clean exit
}

# Report error and exit
die()
{
    exec 1>&2
    echo
    echo "Error encountered:"
    while [ "$#" -ge 1 ]; do echo "    $1"; shift; done
    echo
    echo "See '${0##*/} -help' for usage"
    echo
    exit 1
}

#------------------------------------------------------------------------------
unset locations

# Parse options
while [ "$#" -gt 0 ]
do
    case "$1" in
    -h | -help* | --help*)
        printHelp
        ;;

    -app)
        locations="$locations applications/solvers applications/utilities"
        ;;

    -src)
        locations="$locations src"
        ;;

    -no-git)
        unset FOAM_GIT_DIR
        ;;
    *)
        die "unknown option/argument: '$1'"
        ;;
    esac
    shift
done

# Check environment variables
[ -d "$WM_PROJECT_DIR" ] || \
    die "Bad or unset environment variable: \$WM_PROJECT_DIR"

# Fallback to all locations
if [ -z "$locations" ]
then
    locations="applications/solvers applications/utilities src"
fi

set -- $locations

if [ "$#" -eq 0 ]
then
   die "No search locations"
fi

# Run from top-level directory - otherwise the grep is quite difficult

cd "$WM_PROJECT_DIR" || die "No project directory: $WM_PROJECT_DIR"

for dir in "$@"
do
    if [ -d "$dir" ]
    then
        echo "Checking: $dir" 1>&2
    else
        echo "No directory: $dir" 1>&2
        continue
    fi

    if [ -d "$FOAM_GIT_DIR" ]
    then
        git grep --cached -H -P '^\s*LIB_LIBS\s*=' "$dir" 2>/dev/null
    else
        # Filesystem find (not quite as fast)
        for i in $(find "$dir" -name options)
        do
            grep -H -P '^\s*LIB_LIBS\s*=' "$i" 2>/dev/null
        done
    fi
done | sed -ne 's@/Make/options:.*$@@p' | sort | uniq

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