// Simple ANSI color library.
//
// TODO: Windows support.
const u8 color_black = 0u8;

const u8 color_red = 1u8;

const u8 color_green = 2u8;

const u8 color_yellow = 3u8;

const u8 color_blue = 4u8;

const u8 color_magenta = 5u8;

const u8 color_cyan = 6u8;

const u8 color_light_gray = 7u8;

const u8 color_light_grey = 7u8;

const u8 color_dark_gray = 8u8;

const u8 color_dark_grey = 8u8;

const u8 color_bright_red = 9u8;

const u8 color_bright_green = 10u8;

const u8 color_bright_yellow = 11u8;

const u8 color_bright_blue = 12u8;

const u8 color_bright_magenta = 13u8;

const u8 color_bright_cyan = 14u8;

const u8 color_bright_white = 15u8;

fn esc(ioivec::buf_writer writer) { writer.write(~[0x1bu8, '[' as u8]); }

fn reset(ioivec::buf_writer writer) {
    esc(writer);
    writer.write(~['0' as u8, 'm' as u8]);
}

fn color_supported() -> bool {
    auto supported_terms = ~["xterm-color", "xterm", "screen-bce"];
    ret alt (generic_os::getenv("TERM")) {
          case (option::some(?env)) {
            for (str term in supported_terms) {
                if (str::eq(term, env)) { true }
            }
            false
          }
          case (option::none) { false }
        };
}

fn set_color(ioivec::buf_writer writer, u8 first_char, u8 color) {
    assert (color < 16u8);
    esc(writer);
    if (color >= 8u8) { writer.write(~['1' as u8, ';' as u8]); color -= 8u8; }
    writer.write(~[first_char, ('0' as u8) + color, 'm' as u8]);
}

fn fg(ioivec::buf_writer writer, u8 color) {
    ret set_color(writer, '3' as u8, color);
}

fn bg(ioivec::buf_writer writer, u8 color) {
    ret set_color(writer, '4' as u8, color);
}
// export fg;
// export bg;

// Local Variables:
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// compile-command: "make -k -C $RBUILD 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
// End: