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InputTerminal

Wolfram Kernel
Execution environment
wljs-inputs
Package
InputTerminal[opts___] _EventObject

creates a minimal interactive terminal, which can capture user inputs and used for streaming data as well.

Based on ttty project

Event generation​

The following patters are emitted

  • "Command"
  • "Interrupt" (caused by Ctrl+C)

Backprogapation​

Any event handling function output can be used to output the data back to the terminal, i.e. a simple echo handler can be constructed as follows:

t = InputTerminal[]
EventHandler[t, {"Command" -> Function[c, c]}]

The returned value of Function[c, ...] can be:

  • _String
  • {__String} list of string
  • _Promise a promise that resolves into strings
  • {__Promise} list of promises
  • anything else will not be printed to the terminal

Options​

ImageSize​

Sets the size of a terminal in pixels. Must be a number or a pair of numbers

Streaming​

The generated EventObject contains two input streams:

  • t["StandardOutput"] a writable stream for basic output
  • t["StandardError"] a writable stream for errors

For example

t = InputTerminal[]
WriteString[t["StandardOutput"], "Hi There!"];

Another example: you can redirect the output of all warnings to the terminal using:

$Messages = {t["StandardError"]};

and then try

1/0

Output forms​

The same as any EventObject