godot-xterm/docs/api/terminal.md

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Terminal

Inherits: Control < CanvasItem < Node < Object

A Terminal emulator Control node.

Supports ANSI and (some) XTerm Control Sequences which can be used to do things such as clear the screen, move the cursor, change printed text color, ring a bell, and so on. For an exhaustive list of terminal control sequences (not all of which are supported by GodotXterm) see "XTerm Control Sequences".

Overview

_{"Terminal Flow Diagram" is a derivative of "computer keyboard 2" and "monitor", from U.S. patent drawings, uploaded by johnny_automatic, used under CC0.}

(1) User Input

The user enters some data into the terminal, typically by typing something on the keyboard. This corresponds to the _gui_input() method.

(2) Terminal Output

The user input from (1) is processed by the terminal state machine and converted to the appropriate output. For example, if the user were to press the downwards arrow key (↓), the terminal would then emit data_sent() with the value "\u001b[A".

(3) Terminal Input

In the other direction, data can be sent to the terminal. This corresponds to the write() method.

(4) Draw

The input from (3) is then interpreted by the terminal state machine and drawn to the screen. For example if the string "\u001b[38;2;0;255;0;mA" was written to the terminal, then it would draw a green colored capital letter 'A' on the screen.

Properties

Type	Name	Default
bool	bell_muted	false
float	bell_cooldown	0.1
UpdateMode	update_mode	AUTO

Methods

Returns	Signature
void	clear ()
String	copy_all ()
String	copy_selection ()
int	get_cols ()
int	get_rows ()
void	write ( String | PoolByteArray data )

Signals

• bell ()

  Emitted when the bell character ("\u0007") is written to the terminal.

---

• data_sent ( PoolByteArray data )

  Emitted when some data comes out of the terminal. This typically occurs when the user interacts with the terminal by typing on the keyboard. Input can be interpreted differently depending on modifier keys and the terminal's settings/state.

  When connected to a PTY, this data will be forwarded to it.

---

• key_pressed ( String data, InputEventKey event )

  Emitted when a key is pressed. data is the data that would be emitted by the terminal via the data_sent() signal and may vary based on the terminal's state. event is the event captured by Godot in the _gui_input(event) method.

---

• size_changed ( Vector2 new_size )

  Emitted when the terminal's size changes, typically in response to its rect_size changing. new_size.x will be the number of columns and new_size.y will be the number of rows. This information should be forwarded to a pseudoterminal, if it is connected, so that it can update its size accordingly.

Enumerations

enum UpdateMode:

• DISABLED = 0 --- The terminal's update() method will never be called. No new cells will be drawn.
• AUTO = 1 --- Only changed cells will be drawn after update() is called, but will switch to ALL_NEXT_FRAME when mass redraws are required.
• ALL = 2 --- Every cell will be drawn on every update() call.
• ALL_NEXT_FRAME = 3 --- Draws every cell afetr the next update() call, then returns to AUTO.

Property Descriptions

• bool bell_muted

  Default	false
  Setter	None
  Getter	None

  If muted, no bell signal will be emitted when the bell character ("\u0007") is written to the terminal.

---

• float bell_cooldown

  Default	0.1
  Setter	None
  Getter	None

  The minimum amount of time to wait before emitting another bell signal on subsequent writes of the bell character. Writing the bell character too frequently, for example by running the command while true; do echo -e "\a"; done, can have a negative impact on performance depending on how the signal is connected. This property allows throttling of that signal.

---

• UpdateMode update_mode

  Default	AUTO
  Setter	set_update_mode(value)
  Getter	None

  Determines which cells of the terminal will be updated when its state changes. By default AUTO will only update cells that changed, but will update all cells (i.e. the entire screen) on major changes, such as terminal resize. If you are having trouble with the terminal not updating correctly or exhibiting artifacts, you can try remedying this by setting update_mode to ALL, however, this will have a negative impact on performance.

Method Descriptions

• void clear ()

  Removes all but the bottommost row of the terminal including scrollback buffer.

---

• String copy_all ()

  Copies all of the text in the terminal including scrollback buffer.

---

• String copy_selection ()

  Copies only selected (i.e. highlighted) text in the terminal. Will return an empty string if nothing is highligted.

---

• int get_cols ()

  Returns the width of the terminal in characters. When using a monospace font, this is the number of visible characters that can fit from one side of the terminal to the other in a single row. It will automatically update according to the terminal's rect_size and theme's font size.

---

• int get_rows ()

  Returns the height of the terminal in characters. When using a monospace font, this is the number of visible characters that can fit from the top of the terminal to the bottom in a single column. It will automatically update according to the terminal's rect_size and theme's font size.

---

• void write ( String | PoolByteArray data )

  Writes data to the terminal emulator. Accepts either a String or PoolByteArray. Typically it would be connected to the output of a PTY's data_received() signal.

  Example:

  $Terminal.write("Hello World")
  $Terminal.write("Hello World".to_utf8())
  $Terminal.write(PoolByteArray([0x1b, 0x9e])