#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | www.openfoam.com
#    \\/     M anipulation  |
#-------------------------------------------------------------------------------
#     Copyright (C) 2020-2022 OpenCFD Ltd.
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, distributed under GPL-3.0-or-later.
#
# Script
#     wmake/scripts/wmake-with-bear
#     Backend for "wmake -with-bear"
#
# Usage
#     wmake-with-bear [wmake options and args]
#
# Description
#     Call wmake via 'bear' to create json output.
#
# Environment
#     WM_PROJECT_DIR, WM_PROJECT_USER_DIR, WM_OPTIONS
#
#-------------------------------------------------------------------------------
cacheDirName="build/$WM_OPTIONS"

printHelp() {
    cat<<USAGE

Usage: ${0##*/} [wmake options and args]

options:
  -bear-output-dir=DIR  Specify output directory
  -version              Print bear version
  -h | -help            Display short help and exit

Call wmake via 'bear' to create json output.
Output: ${outputDir:-"${WM_PROJECT_DIR:-<project>}/$cacheDirName"}

USAGE
    exit 0  # A clean exit
}


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

unset optVersion outputDir

# Parse options
while [ "$#" -gt 0 ]
do
    case "$1" in
    ('') ;;
    (- | --) shift; break ;;  # Stop option parsing

    -h | -help*)
       printHelp
       ;;

    -version)
        optVersion=true
        break
        ;;

    -bear-output-dir=*)
        outputDir="${1#*=}"
        ;;
    *)
        break
        ;;
    esac
    shift
done

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

# Detect version. Seems to be stderr for some versions!?
if version="$(bear --version 2>&1)"
then
    version="$(echo "$version" | sed -ne '1s/^[^0-9]*\([1-9]\)/\1/p;')"
else
    unset version
fi

if [ "$optVersion" = true ]
then
    echo "bear=$(command -v bear)"
    echo "version=${version:-missing}"
    exit 0
fi

# Not found? Can stop immediately
if [ -z "$version" ]
then
    echo "Warning: bear not found" 1>&2
    echo "Stopping" 1>&2
    exit 2
fi


unset outputFile
setOutput()
{
    if [ -z "$outputDir" ]
    then
        prefixDir="$WM_PROJECT_DIR"
        if ! [ -w "$prefixDir" ]
        then
            echo "Non-writable directory: $prefixDir" 1>&2
            echo "Try with user location" 1>&2
            prefixDir="$WM_PROJECT_USER_DIR"

            if ! [ -w "$prefixDir" ]
            then
                echo "Non-writable directory: $prefixDir" 1>&2
                echo "Using home directory" 1>&2
                prefixDir="$HOME"
            fi
        fi
        outputDir="$prefixDir/$cacheDirName"
    fi

    mkdir -p "$outputDir"
    outputFile="$outputDir/compile_commands.json"
    echo "Output = $outputFile" 1>&2
}


case "$version" in
(2.*)
    # Version 2
    echo "Use bear $version" 1>&2
    setOutput
    exec bear --append -o "$outputFile" wmake "$@"
    ;;

([3-9].* | [1-9][0-9].*)
    # Version 3 or newer
    echo "Use bear $version" 1>&2
    setOutput
    exec bear --append --output "$outputFile" -- wmake "$@"
    ;;

(*)
    # Unknown version or some other error
    echo "Warning: bear $version" 1>&2
    echo "Stopping" 1>&2
    exit 1
    ;;
esac

# Should never reach here
exit $?

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