#justjavac/terminal_size

Cross-platform terminal size helpers for MoonBit.

///|
test "terminal size api can be called" {
  match @terminal_size.terminal_size() {
    Some(size) => {
      assert_true(size.columns > 0)
      assert_true(size.rows > 0)
    }
    None => ()
  }
}

Size

source

pub struct Size {
  columns : Int
  rows : Int
} derive(Eq, @moonbitlang/core/debug.Debug
Debug)

Visible size of a terminal measured in character cells.

columns is the terminal width and rows is the terminal height. The public API uses a small record so callers can access size.columns and size.rows directly, which is usually more natural in MoonBit than wrapping each dimension in its own numeric newtype.

Values returned by terminal_size() are always positive.

impl Show for Size

terminal_size

source

fn terminal_size() -> Size?

Returns the visible size of the current terminal in character cells.

The function probes the three standard streams in this order: stdout, stderr, then stdin. The first stream that is attached to a terminal and reports a non-zero size wins. If none of the standard streams are attached to a terminal, this function returns None.

The implementation uses platform-native APIs:

Windows: GetConsoleScreenBufferInfo
Unix-like systems: ioctl(TIOCGWINSZ)

The returned Size describes the visible terminal window, not a scrollback buffer or an off-screen backing store.

Example

test {
  match @terminal_size.terminal_size() {
    Some(size) => {
      assert_true(size.columns > 0)
      assert_true(size.rows > 0)
    }
    None => ()
  }
}

Source Files

terminal_size.mbt

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terminal_size

#justjavac/terminal_size

#Size

#terminal_size

Example

Source Files

Size

terminal_size