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207 lines
7.8 KiB
Markdown
207 lines
7.8 KiB
Markdown
# Terminal
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**Inherits:** {{Control}} < {{CanvasItem}} < {{Node}} < {{Object}}
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A Terminal emulator Control node.
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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.
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For an exhaustive list of terminal control sequences (not all of which are supported by GodotXterm) see ["XTerm Control Sequences"](https://invisible-island.net/xterm/ctlseqs/ctlseqs.html).
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## Overview
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<sub>"Terminal Flow Diagram" is a derivative of ["computer keyboard 2"](https://openclipart.org/detail/2396/computer-keyboard-2) and ["monitor"](https://openclipart.org/detail/1637/monitor), from U.S. patent drawings, uploaded by [johnny_automatic](https://openclipart.org/artist/johnny_automatic), used under [CC0](https://creativecommons.org/share-your-work/public-domain/cc0/).<sub/>
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### (1) User Input
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The user enters some data into the terminal, typically by typing something on the keyboard.
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This corresponds to the `_gui_input()` method.
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### (2) Terminal Output
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The user input from (1) is processed by the terminal state machine and converted to the appropriate output.
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For example, if the user were to press the downwards arrow key (↓), the terminal would then emit `data_sent()`
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with the value `"\u001b[A"`.
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### (3) Terminal Input
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In the other direction, data can be sent to the terminal. This corresponds to the `write()` method.
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### (4) Draw
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The input from (3) is then interpreted by the terminal state machine and drawn to the screen.
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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.
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## Properties
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| Type | Name | Default |
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| ------------ | ------------------------------------ | ------- |
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| {{bool}} | [bell_muted](#prop-bell_muted) | false |
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| {{float}} | [bell_cooldown](#prop-bell_cooldown) | 0.1 |
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| [UpdateMode] | [update_mode](#prop-update_mode) | AUTO |
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## Methods
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| Returns | Signature |
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| ---------- | ------------------------------------------------------------------- |
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| void | [clear](#mthd-clear) **( )** |
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| {{String}} | [copy_all](#mthd-copy_all) **( )** |
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| {{String}} | [copy_selection](#mthd-copy_selection) **( )** |
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| {{int}} | [get_cols](#mthd-get_cols) **( )** |
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| {{int}} | [get_rows](#mthd-get_rows) **( )** |
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| void | [write](#mthd-write) **(** {{String}}\|{{PoolByteArray}} data **)** |
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## Signals
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<hr id="sgnl-bell" />
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**bell** **(** **)**
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Emitted when the [bell character](https://en.wikipedia.org/wiki/Bell_character) (`"\u0007"`) is written to the terminal.
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<hr id="sgnl-data-sent" />
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**data_sent** **(** {{PoolByteArray}} data **)**
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Emitted when some data comes out of the terminal.
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This typically occurs when the user interacts with the terminal by typing on the keyboard.
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Input can be interpreted differently depending on modifier keys and the terminal's settings and state.
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:::{note}
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When connected to a {{PTY}}, this data will be forwarded to it.
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:::
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<hr id="sgnl-key_pressed" />
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**key_pressed** **(** {{String}} data, {{InputEventKey}} event **)**
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Emitted when a key is pressed. `data` is the data that would be emitted by the terminal via the [`data_sent()`](#sgnl-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.
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<hr id="sgnl-size_changed" />
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**size_changed** **(** {{Vector2}} new_size **)**
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Emitted when the terminal's size changes, typically in response to its `rect_size` changing.
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`new_size.x` will be the number of columns and `new_size.y` will be the number of rows.
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This information should be forwarded to a pseudoterminal, if it is connected, so that it can update its size accordingly.
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<hr/>
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## Enumerations
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<hr id="enum-update_mode" />
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enum **UpdateMode**:
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- **DISABLED** = 0 --- The terminal's `update()` method will never be called. No new cells will be drawn.
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- **AUTO** = 1 --- Only changed cells will be drawn after `update()` is called, but will switch to `ALL_NEXT_FRAME` when mass redraws are required.
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- **ALL** = 2 --- Every cell will be drawn on every `update()` call.
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- **ALL_NEXT_FRAME** = 3 --- Draws every cell after the next `update()` call, then returns to `AUTO`.
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<hr/>
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## Property Descriptions
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<hr id="prop-bell_muted" />
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{{bool}} **bell_muted**
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| --------- | ----- |
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| _Default_ | false |
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| _Setter_ | None |
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| _Getter_ | None |
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If muted, no [`bell`](#sgnl-bell) signal will be emitted when the bell character (`"\u0007"`) is written to the terminal.
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<hr id="prop-bell_cooldown" />
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{{float}} **bell_cooldown**
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| --------- | ---- |
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| _Default_ | 0.1 |
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| _Setter_ | None |
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| _Getter_ | None |
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The minimum amount of time to wait before emitting another [`bell`](#sgnl-bell) signal on subsequent writes of the bell character.
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:::{caution}
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Writing the bell character too frequently, for example by running the command `while true; do echo -e "\a"; done`,
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can have a negative impact on performance depending on how the signal is connected.
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This property allows throttling of that signal's emission.
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:::
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<hr id="prop-update_mode" />
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[UpdateMode] **update_mode**
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| --------- | ------------------------------------------- |
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| _Default_ | AUTO |
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| _Setter_ | void set_update_mode ( [UpdateMode] value ) |
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| _Getter_ | None |
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Determines which cells of the terminal will be updated when its state changes.
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By default `AUTO` will only update cells that changed, but will update all cells (i.e. the entire screen) on major changes,
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such as terminal resize.
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:::{hint}
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If the screen is not updating properly, then setting the `update_mode` to `ALL` can be a workaround for this. However, this will have a negative impact on performance. Update issues should be reported to [the issue tracker](https://github.com/lihop/godot-xterm/issues).
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:::
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<hr/>
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## Method Descriptions
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<hr id="mthd-clear" />
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void **clear** **( )**
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Removes all but the bottommost row of the terminal including scrollback buffer.
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<hr id="mthd-copy_all" />
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{{String}} **copy_all** **( )**
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Copies all of the text in the terminal including scrollback buffer.
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<hr id="mthd-copy_selection" />
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{{String}} **copy_selection** **( )**
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Copies only selected (i.e. highlighted) text in the terminal.
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Will return an empty string if nothing is highlighted.
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<hr id="mthd-get_cols" />
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{{int}} **get_cols** **( )**
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Returns the width of the terminal in characters.
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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.
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It will automatically update according to the terminal's rect_size and theme's font size.
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<hr id="mthd-get_rows" />
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{{int}} **get_rows** **( )**
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Returns the height of the terminal in characters.
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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.
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It will automatically update according to the terminal's rect_size and theme's font size.
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<hr id="mthd-write" />
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void **write** **(** {{String}}\|{{PoolByteArray}} data **)**
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Writes data to the terminal emulator. Accepts either a {{String}} or {{PoolByteArray}}.
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Typically it would be connected to the output of a {{PTY}}'s [`data_received()`](pty.md#sgnl-data_received) signal.
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Example:
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```gdscript
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$Terminal.write("Hello World")
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$Terminal.write("Hello World".to_utf8())
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$Terminal.write(PoolByteArray([0x1b, 0x9e])
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```
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[UpdateMode]: #enum-update_mode
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