#include <luna/String.h>
#include <os/ArgumentParser.h>
#include <os/File.h>

using os::File;

Result<int> luna_main(int argc, char** argv)
{
    StringView pathname;

    os::ArgumentParser parser;
    parser.add_description("Edit a file using basic line-based shell editing."_sv);
    parser.add_positional_argument(pathname, "path"_sv, true);
    parser.parse(argc, argv);

    auto file = TRY(File::open_or_create(pathname, File::WriteOnly));

    auto input = File::standard_input();

    while (1)
    {
        String line = TRY(input->read_line());
        if (line.is_empty()) break;
        TRY(file->write(line.view()));
    }

    return 0;
}