class IO

Public Class Methods

console → #<File:/dev/tty> click to toggle source

Returns an File instance opened console.

You must require 'io/console' to use this method.

static VALUE
console_dev(VALUE klass)
{
    VALUE con = 0;
    rb_io_t *fptr;

    if (klass == rb_cIO) klass = rb_cFile;
    if (rb_const_defined(klass, id_console)) {
        con = rb_const_get(klass, id_console);
        if (RB_TYPE_P(con, T_FILE)) {
            if ((fptr = RFILE(con)->fptr) && GetReadFD(fptr) != -1)
                return con;
        }
        rb_mod_remove_const(klass, ID2SYM(id_console));
    }
    {
        VALUE args[2];
#if defined HAVE_TERMIOS_H || defined HAVE_TERMIO_H || defined HAVE_SGTTY_H
# define CONSOLE_DEVICE "/dev/tty"
#elif defined _WIN32
# define CONSOLE_DEVICE "con$"
# define CONSOLE_DEVICE_FOR_READING "conin$"
# define CONSOLE_DEVICE_FOR_WRITING "conout$"
#endif
#ifndef CONSOLE_DEVICE_FOR_READING
# define CONSOLE_DEVICE_FOR_READING CONSOLE_DEVICE
#endif
#ifdef CONSOLE_DEVICE_FOR_WRITING
        VALUE out;
        rb_io_t *ofptr;
#endif
        int fd;

#ifdef CONSOLE_DEVICE_FOR_WRITING
        fd = rb_cloexec_open(CONSOLE_DEVICE_FOR_WRITING, O_WRONLY, 0);
        if (fd < 0) return Qnil;
        rb_update_max_fd(fd);
        args[1] = INT2FIX(O_WRONLY);
        args[0] = INT2NUM(fd);
        out = rb_class_new_instance(2, args, klass);
#endif
        fd = rb_cloexec_open(CONSOLE_DEVICE_FOR_READING, O_RDWR, 0);
        if (fd < 0) {
#ifdef CONSOLE_DEVICE_FOR_WRITING
            rb_io_close(out);
#endif
            return Qnil;
        }
        rb_update_max_fd(fd);
        args[1] = INT2FIX(O_RDWR);
        args[0] = INT2NUM(fd);
        con = rb_class_new_instance(2, args, klass);
        GetOpenFile(con, fptr);
#ifdef HAVE_RUBY_IO_H
        fptr->pathv = rb_obj_freeze(rb_str_new2(CONSOLE_DEVICE));
#else
        fptr->path = ruby_strdup(CONSOLE_DEVICE);
#endif
#ifdef CONSOLE_DEVICE_FOR_WRITING
        GetOpenFile(out, ofptr);
# ifdef HAVE_RB_IO_GET_WRITE_IO
        ofptr->pathv = fptr->pathv;
        fptr->tied_io_for_writing = out;
# else
        fptr->f2 = ofptr->f;
        ofptr->f = 0;
# endif
        ofptr->mode |= FMODE_SYNC;
#endif
        fptr->mode |= FMODE_SYNC;
        rb_const_set(klass, id_console, con);
    }
    return con;
}

console_size() click to toggle source

# File io/console/size.rb, line 15
def IO.console_size
  console.winsize
rescue NoMethodError
  default_console_size
end

default_console_size() click to toggle source

# File io/console/size.rb, line 1
def IO.default_console_size
  [
    ENV["LINES"].to_i.nonzero? || 25,
    ENV["COLUMNS"].to_i.nonzero? || 80,
  ]
end

Public Instance Methods

cooked {|io| } click to toggle source

Yields self within cooked mode.

STDIN.cooked(&:gets)

will read and return a line with echo back and line editing.

You must require 'io/console' to use this method.

static VALUE
console_cooked(VALUE io)
{
    return ttymode(io, rb_yield, set_cookedmode, NULL);
}

cooked! click to toggle source

Enables cooked mode.

If the terminal mode needs to be back, use io.cooked { … }.

You must require 'io/console' to use this method.

static VALUE
console_set_cooked(VALUE io)
{
    conmode t;
    rb_io_t *fptr;
    int fd;

    GetOpenFile(io, fptr);
    fd = GetReadFD(fptr);
    if (!getattr(fd, &t)) rb_sys_fail(0);
    set_cookedmode(&t, NULL);
    if (!setattr(fd, &t)) rb_sys_fail(0);
    return io;
}

echo = flag click to toggle source

Enables/disables echo back. On some platforms, all combinations of this flags and raw/cooked mode may not be valid.

You must require 'io/console' to use this method.

static VALUE
console_set_echo(VALUE io, VALUE f)
{
    conmode t;
    rb_io_t *fptr;
    int fd;

    GetOpenFile(io, fptr);
    fd = GetReadFD(fptr);
    if (!getattr(fd, &t)) rb_sys_fail(0);
    if (RTEST(f))
        set_echo(&t, NULL);
    else
        set_noecho(&t, NULL);
    if (!setattr(fd, &t)) rb_sys_fail(0);
    return io;
}

echo? → true or false click to toggle source

Returns true if echo back is enabled.

You must require 'io/console' to use this method.

static VALUE
console_echo_p(VALUE io)
{
    conmode t;
    rb_io_t *fptr;
    int fd;

    GetOpenFile(io, fptr);
    fd = GetReadFD(fptr);
    if (!getattr(fd, &t)) rb_sys_fail(0);
    return echo_p(&t) ? Qtrue : Qfalse;
}

getch(min: nil, time: nil) → char click to toggle source

Reads and returns a character in raw mode.

You must require 'io/console' to use this method.

static VALUE
console_getch(int argc, VALUE *argv, VALUE io)
{
    rawmode_arg_t opts, *optp = rawmode_opt(argc, argv, &opts);
    return ttymode(io, getc_call, set_rawmode, optp);
}

iflush click to toggle source

Flushes input buffer in kernel.

You must require 'io/console' to use this method.

static VALUE
console_iflush(VALUE io)
{
    rb_io_t *fptr;
    int fd;

    GetOpenFile(io, fptr);
    fd = GetReadFD(fptr);
#if defined HAVE_TERMIOS_H || defined HAVE_TERMIO_H
    if (tcflush(fd, TCIFLUSH)) rb_sys_fail(0);
#endif
    return io;
}

ioflush click to toggle source

Flushes input and output buffers in kernel.

You must require 'io/console' to use this method.

static VALUE
console_ioflush(VALUE io)
{
    rb_io_t *fptr;
#if defined HAVE_TERMIOS_H || defined HAVE_TERMIO_H
    int fd1, fd2;
#endif

    GetOpenFile(io, fptr);
#if defined HAVE_TERMIOS_H || defined HAVE_TERMIO_H
    fd1 = GetReadFD(fptr);
    fd2 = GetWriteFD(fptr);
    if (fd2 != -1 && fd1 != fd2) {
        if (tcflush(fd1, TCIFLUSH)) rb_sys_fail(0);
        if (tcflush(fd2, TCOFLUSH)) rb_sys_fail(0);
    }
    else {
        if (tcflush(fd1, TCIOFLUSH)) rb_sys_fail(0);
    }
#endif
    return io;
}

noecho {|io| } click to toggle source

Yields self with disabling echo back.

STDIN.noecho(&:gets)

will read and return a line without echo back.

You must require 'io/console' to use this method.

static VALUE
console_noecho(VALUE io)
{
    return ttymode(io, rb_yield, set_noecho, NULL);
}

oflush click to toggle source

Flushes output buffer in kernel.

You must require 'io/console' to use this method.

static VALUE
console_oflush(VALUE io)
{
    rb_io_t *fptr;
    int fd;

    GetOpenFile(io, fptr);
    fd = GetWriteFD(fptr);
#if defined HAVE_TERMIOS_H || defined HAVE_TERMIO_H
    if (tcflush(fd, TCOFLUSH)) rb_sys_fail(0);
#endif
    return io;
}

raw(min: nil, time: nil) {|io| } click to toggle source

Yields self within raw mode.

STDIN.raw(&:gets)

will read and return a line without echo back and line editing.

You must require 'io/console' to use this method.

static VALUE
console_raw(int argc, VALUE *argv, VALUE io)
{
    rawmode_arg_t opts, *optp = rawmode_opt(argc, argv, &opts);
    return ttymode(io, rb_yield, set_rawmode, optp);
}

raw!(min: nil, time: nil) click to toggle source

Enables raw mode.

If the terminal mode needs to be back, use io.raw { … }.

You must require 'io/console' to use this method.

static VALUE
console_set_raw(int argc, VALUE *argv, VALUE io)
{
    conmode t;
    rb_io_t *fptr;
    int fd;
    rawmode_arg_t opts, *optp = rawmode_opt(argc, argv, &opts);

    GetOpenFile(io, fptr);
    fd = GetReadFD(fptr);
    if (!getattr(fd, &t)) rb_sys_fail(0);
    set_rawmode(&t, optp);
    if (!setattr(fd, &t)) rb_sys_fail(0);
    return io;
}

winsize → [rows, columns] click to toggle source

Returns console size.

You must require 'io/console' to use this method.

static VALUE
console_winsize(VALUE io)
{
    rb_io_t *fptr;
    int fd;
    rb_console_size_t ws;

    GetOpenFile(io, fptr);
    fd = GetWriteFD(fptr);
    if (!getwinsize(fd, &ws)) rb_sys_fail(0);
    return rb_assoc_new(INT2NUM(winsize_row(&ws)), INT2NUM(winsize_col(&ws)));
}

winsize = [rows, columns] click to toggle source

Tries to set console size. The effect depends on the platform and the running environment.

You must require 'io/console' to use this method.

static VALUE
console_set_winsize(VALUE io, VALUE size)
{
    rb_io_t *fptr;
    rb_console_size_t ws;
#if defined _WIN32
    HANDLE wh;
    int newrow, newcol;
#endif
    VALUE row, col, xpixel, ypixel;
#if defined TIOCSWINSZ
    int fd;
#endif

    GetOpenFile(io, fptr);
    size = rb_Array(size);
    rb_scan_args((int)RARRAY_LEN(size), RARRAY_PTR(size), "22",
                &row, &col, &xpixel, &ypixel);
#if defined TIOCSWINSZ
    fd = GetWriteFD(fptr);
    ws.ws_row = ws.ws_col = ws.ws_xpixel = ws.ws_ypixel = 0;
#define SET(m) ws.ws_##m = NIL_P(m) ? 0 : (unsigned short)NUM2UINT(m)
    SET(row);
    SET(col);
    SET(xpixel);
    SET(ypixel);
#undef SET
    if (!setwinsize(fd, &ws)) rb_sys_fail(0);
#elif defined _WIN32
    wh = (HANDLE)rb_w32_get_osfhandle(GetReadFD(fptr));
    newrow = (SHORT)NUM2UINT(row);
    newcol = (SHORT)NUM2UINT(col);
    if (!getwinsize(GetReadFD(fptr), &ws)) {
        rb_sys_fail("GetConsoleScreenBufferInfo");
    }
    if ((ws.dwSize.X < newcol && (ws.dwSize.X = newcol, 1)) ||
        (ws.dwSize.Y < newrow && (ws.dwSize.Y = newrow, 1))) {
        if (!(SetConsoleScreenBufferSize(wh, ws.dwSize) || SET_LAST_ERROR)) {
            rb_sys_fail("SetConsoleScreenBufferInfo");
        }
    }
    ws.srWindow.Left = 0;
    ws.srWindow.Top = 0;
    ws.srWindow.Right = newcol;
    ws.srWindow.Bottom = newrow;
    if (!(SetConsoleWindowInfo(wh, FALSE, &ws.srWindow) || SET_LAST_ERROR)) {
        rb_sys_fail("SetConsoleWindowInfo");
    }
#endif
    return io;
}