Load Visual Studio Environment on GIT Bash.sh

# Add to ~/.bashrc
# call load_msenv [year] from a shell to load the enviroment
function load_msenv() {
    local msversion_year=2019
    if [ $# -gt 0 ]; then
        msversion_year=$1
    fi

    case $msversion_year in
        2017)
            msversion_prod=15
            ;;
        2019)
            msversion_prod=16
            ;;
        *)
            >&2 printf "Invalid version year"
            return 1
    esac

    msversion_prod_p1=$(($msversion_prod+1))

    local VSWHERE='C:\Program Files (x86)\Microsoft Visual Studio\Installer\vswhere.exe'
    installPath=$("$VSWHERE" -products '*' -version "[$msversion_prod,$msversion_prod_p1\)" -property installationPath)

    local vcvarsall="${installPath}\\VC\\Auxiliary\\Build\\vcvarsall.bat"

    local msenv="$HOME/.msenv_${msversion_year}_bash"
    if [ ! -f "$msenv" ]; then
        local msenvbatch="__print_ms_env.bat"
        echo "@echo off" > "$msenvbatch"
        echo "call \"${vcvarsall}\" x64" >> "$msenvbatch"
        echo "set" >> "$msenvbatch"
        cmd "/C $msenvbatch" > "$msenv.tmp"
        rm -f "$msenvbatch"

        grep -E '^PATH=' "$msenv.tmp" | \
            sed \
                -e 's/\(.*\)=\(.*\)/export \1="\2"/g' \
                -e 's/\([a-zA-Z]\):[\\\/]/\/\1\//g' \
                -e 's/\\/\//g' \
                -e 's/;\//:\//g' \
                > "$msenv"

        # Don't mess with CL compilation env
        grep -E '^(INCLUDE|LIB|LIBPATH)=' "$msenv.tmp" | \
            sed \
                -e 's/\(.*\)=\(.*\)/export \1="\2"/g' \
                >> "$msenv"

        rm "$msenv.tmp"
    fi

    source "$msenv"
}

export -f load_msenv