Class: IO (Ruby 2.3.4)

Home Classes Methods

In Files

io/console/console.c
io/console/lib/console/size.rb

Parent

Object

Namespace

MODULE IO::generic_readable

Methods

Class/Module Index

IO

Public Class Methods

console → #

console(sym, *args)

Returns an File instance opened console.

If sym is given, it will be sent to the opened console with args and the result will be returned instead of the console IO itself.

You must require ‘io/console’ to use this method.

 
               static VALUE
console_dev(int argc, VALUE *argv, VALUE klass)
{
    VALUE con = 0;
    rb_io_t *fptr;
    VALUE sym = 0;

    rb_check_arity(argc, 0, UNLIMITED_ARGUMENTS);
    if (argc) {
        Check_Type(sym = argv[0], T_SYMBOL);
    }
    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) ||
            (!(fptr = RFILE(con)->fptr) || GetReadFD(fptr) == -1)) {
            rb_const_remove(klass, id_console);
            con = 0;
        }
    }
    if (sym) {
        if (sym == ID2SYM(id_close) && argc == 1) {
            if (con) {
                rb_io_close(con);
                rb_const_remove(klass, id_console);
                con = 0;
            }
            return Qnil;
        }
    }
    if (!con) {
        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_RDWR, 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);
        fptr->pathv = rb_obj_freeze(rb_str_new2(CONSOLE_DEVICE));
#ifdef CONSOLE_DEVICE_FOR_WRITING
        GetOpenFile(out, ofptr);
        ofptr->pathv = fptr->pathv;
        fptr->tied_io_for_writing = out;
        ofptr->mode |= FMODE_SYNC;
#endif
        fptr->mode |= FMODE_SYNC;
        rb_const_set(klass, id_console, con);
    }
    if (sym) {
        return rb_f_send(argc, argv, con);
    }
    return con;
}

console_size()

returns console window size

 
               # File io/console/lib/console/size.rb, line 18
def IO.console_size
  console.winsize
rescue NoMethodError
  default_console_size
end

default_console_size()

frozen_string_literal: false fallback to console window size

 
               # File io/console/lib/console/size.rb, line 3
def IO.default_console_size
  [
    ENV["LINES"].to_i.nonzero? || 25,
    ENV["COLUMNS"].to_i.nonzero? || 80,
  ]
end

Public Instance Methods

beep()

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

    GetOpenFile(io, fptr);
    fd = GetWriteFD(fptr);
#ifdef _WIN32
    (void)fd;
    MessageBeep(0);
#else
    if (write(fd, "\a", 1) < 0)
        rb_sys_fail(0);
#endif
    return io;
}

cooked {|io| }

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!

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;
}

cursor()

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

    GetOpenFile(io, fptr);
    fd = GetWriteFD(fptr);
    if (!GetConsoleScreenBufferInfo((HANDLE)rb_w32_get_osfhandle(fd), &ws)) {
        rb_syserr_fail(LAST_ERROR, 0);
    }
    return rb_assoc_new(UINT2NUM(ws.dwCursorPosition.X), UINT2NUM(ws.dwCursorPosition.Y));
}

cursor=(p1)

 
               static VALUE
console_cursor_set(VALUE io, VALUE cpos)
{
    cpos = rb_convert_type(cpos, T_ARRAY, "Array", "to_ary");
    if (RARRAY_LEN(cpos) != 2) rb_raise(rb_eArgError, "expected 2D coordinate");
    return console_goto(io, RARRAY_AREF(cpos, 0), RARRAY_AREF(cpos, 1));
}

echo = flag

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

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

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);
}

getpass(prompt=nil) → string

Reads and returns a line without echo back. Prints prompt unless it is nil.

You must require ‘io/console’ to use this method.

 
               static VALUE
console_getpass(int argc, VALUE *argv, VALUE io)
{
    VALUE str, wio;

    rb_check_arity(argc, 0, 1);
    wio = rb_io_get_write_io(io);
    if (wio == io && io == rb_stdin) wio = rb_stderr;
    prompt(argc, argv, wio);
    str = rb_ensure(getpass_call, io, puts_call, wio);
    return str_chomp(str);
}

goto(p1, p2)

 
               static VALUE
console_goto(VALUE io, VALUE x, VALUE y)
{
    rb_io_t *fptr;
    int fd;
    COORD pos;

    GetOpenFile(io, fptr);
    fd = GetWriteFD(fptr);
    pos.X = NUM2UINT(x);
    pos.Y = NUM2UINT(y);
    if (!SetConsoleCursorPosition((HANDLE)rb_w32_get_osfhandle(fd), pos)) {
        rb_syserr_fail(LAST_ERROR, 0);
    }
    return io;
}

iflush

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
    (void)fd;
    return io;
}

ioflush

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| }

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

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
    (void)fd;
    return io;
}

pressed?(p1)

 
               static VALUE
console_key_pressed_p(VALUE io, VALUE k)
{
    int vk = -1;

    if (FIXNUM_P(k)) {
        vk = NUM2UINT(k);
    }
    else {
        const struct vktable *t;
        if (SYMBOL_P(k)) {
            k = rb_sym2str(k);
        }
        else {
            StringValueCStr(k);
        }
        t = console_win32_vk(RSTRING_PTR(k), RSTRING_LEN(k));
        if (!t || (vk = (short)t->vk) == -1) {
            rb_raise(rb_eArgError, "unknown virtual key code: %"PRIsVALUE, k);
        }
    }
    return GetKeyState(vk) & 0x80 ? Qtrue : Qfalse;
}

raw(min: nil, time: nil) {|io| }

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)

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]

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]

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;
    const VALUE *sz;
    int fd;
    long sizelen;

    GetOpenFile(io, fptr);
    size = rb_Array(size);
    if ((sizelen = RARRAY_LEN(size)) != 2 && sizelen != 4) {
        rb_raise(rb_eArgError,
                 "wrong number of arguments (given %ld, expected 2 or 4)",
                 sizelen);
    }
    sz = RARRAY_CONST_PTR(size);
    row = sz[0], col = sz[1], xpixel = ypixel = Qnil;
    if (sizelen == 4) xpixel = sz[2], ypixel = sz[3];
    fd = GetWriteFD(fptr);
#if defined TIOCSWINSZ
    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(fd);
#define SET(m) new##m = NIL_P(m) ? 0 : (unsigned short)NUM2UINT(m)
    SET(row);
    SET(col);
#undef SET
    if (!NIL_P(xpixel)) (void)NUM2UINT(xpixel);
    if (!NIL_P(ypixel)) (void)NUM2UINT(ypixel);
    if (!GetConsoleScreenBufferInfo(wh, &ws)) {
        rb_syserr_fail(LAST_ERROR, "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)) {
            rb_syserr_fail(LAST_ERROR, "SetConsoleScreenBufferInfo");
        }
    }
    ws.srWindow.Left = 0;
    ws.srWindow.Top = 0;
    ws.srWindow.Right = newcol;
    ws.srWindow.Bottom = newrow;
    if (!SetConsoleWindowInfo(wh, FALSE, &ws.srWindow)) {
        rb_syserr_fail(LAST_ERROR, "SetConsoleWindowInfo");
    }
#endif
    return io;
}