termcast

The termcast module provides a complete API for simulating interactive terminal sessions,
and sharing them as GIFs.
It can also replay recordings live in the caller's terminal.

Termcast can simulate human keystrokes; execute commands in containers;
ask an AI to imagine a scenario; and more.

Installation

dagger install github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f

Entrypoint

Return Type

Termcast !

Arguments

Name	Type	Default Value	Description
width	Integer	-	Terminal width
height	Integer	-	Terminal height
key	Secret	-	OpenAI auth key, for AI features
container	Container	-	Containerized environment for executing commands
shell	[String ! ]	-	Shell to use when executing commands
prompt	String	-	The prompt shown by the interactive shell

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \

func (m *myModule) example() *Termcast  {
	return dag.
			Termcast()
}

@function
def example() -> dag.Termcast:
	return (
		dag.termcast()
	)

@func()
example(): Termcast {
	return dag
		.termcast()
}

Types

Termcast 🔗

height() 🔗

The height of the terminal

Return Type

Integer !

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 height

func (m *myModule) example(ctx context.Context) int  {
	return dag.
			Termcast().
			Height(ctx)
}

@function
async def example() -> int:
	return await (
		dag.termcast()
		.height()
	)

@func()
async example(): Promise<number> {
	return dag
		.termcast()
		.height()
}

width() 🔗

The width of the terminal

Return Type

Integer !

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 width

func (m *myModule) example(ctx context.Context) int  {
	return dag.
			Termcast().
			Width(ctx)
}

@function
async def example() -> int:
	return await (
		dag.termcast()
		.width()
	)

@func()
async example(): Promise<number> {
	return dag
		.termcast()
		.width()
}

clock() 🔗

Time elapsed since beginning of the session, in milliseconds

Return Type

Integer !

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 clock

func (m *myModule) example(ctx context.Context) int  {
	return dag.
			Termcast().
			Clock(ctx)
}

@function
async def example() -> int:
	return await (
		dag.termcast()
		.clock()
	)

@func()
async example(): Promise<number> {
	return dag
		.termcast()
		.clock()
}

container() 🔗

The containerized environment where commands are executed See Exec()

Return Type

Container !

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 container

func (m *myModule) example() *Container  {
	return dag.
			Termcast().
			Container()
}

@function
def example() -> dagger.Container:
	return (
		dag.termcast()
		.container()
	)

@func()
example(): Container {
	return dag
		.termcast()
		.container()
}

withContainer() 🔗

Customize the container used by ‘exec’

Return Type

Termcast !

Arguments

Name	Type	Default Value	Description
ctr	Container !	-	No description provided

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 with-container --ctr IMAGE:TAG

func (m *myModule) example(ctr *Container) *Termcast  {
	return dag.
			Termcast().
			WithContainer(ctr)
}

@function
def example(ctr: dagger.Container) -> dag.Termcast:
	return (
		dag.termcast()
		.with_container(ctr)
	)

@func()
example(ctr: Container): Termcast {
	return dag
		.termcast()
		.withContainer(ctr)
}

print() 🔗

Simulate data being printed to the terminal, all at once

Return Type

Termcast !

Arguments

Name	Type	Default Value	Description
data	String !	-	No description provided

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 print --data string

func (m *myModule) example(data string) *Termcast  {
	return dag.
			Termcast().
			Print(data)
}

@function
def example(data: str) -> dag.Termcast:
	return (
		dag.termcast()
		.print(data)
	)

@func()
example(data: string): Termcast {
	return dag
		.termcast()
		.print(data)
}

append() 🔗

Append a recording to the end of this recording

Return Type

Termcast !

Arguments

Name	Type	Default Value	Description
other	Termcast !	-	No description provided

Example

echo 'Custom types are not supported in shell examples'

func (m *myModule) example(other *Termcast) *Termcast  {
	return dag.
			Termcast().
			Append(other)
}

@function
def example(other: dag.Termcast) -> dag.Termcast:
	return (
		dag.termcast()
		.append(other)
	)

@func()
example(other: Termcast): Termcast {
	return dag
		.termcast()
		.append(other)
}

waitRandom() 🔗

Simulate the user waiting for a random amount of time, with no input or output

Return Type

Termcast !

Arguments

Name	Type	Default Value	Description
min	Integer !	-	The minimum wait time, in milliseconds
max	Integer !	-	The maximum wait time, in milliseconds

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 wait-random --min integer --max integer

func (m *myModule) example(min int, max int) *Termcast  {
	return dag.
			Termcast().
			WaitRandom(min, max)
}

@function
def example(min: int, max: int) -> dag.Termcast:
	return (
		dag.termcast()
		.wait_random(min, max)
	)

@func()
example(min: number, max: number): Termcast {
	return dag
		.termcast()
		.waitRandom(min, max)
}

wait() 🔗

Simulate waiting for a certain amount of time, with no input or output on the temrinal

Return Type

Termcast !

Arguments

Name	Type	Default Value	Description
ms	Integer !	-	wait time, in milliseconds

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 wait --ms integer

func (m *myModule) example(ms int) *Termcast  {
	return dag.
			Termcast().
			Wait(ms)
}

@function
def example(ms: int) -> dag.Termcast:
	return (
		dag.termcast()
		.wait(ms)
	)

@func()
example(ms: number): Termcast {
	return dag
		.termcast()
		.wait(ms)
}

exec() 🔗

Simulate a human running an interactive command in a container

Return Type

Termcast !

Arguments

Name	Type	Default Value	Description
cmd	String !	-	The command to execute
simple	Boolean	false	Toggle simple mode. Enabling simple mode is faster and more reliable, but also less realistic: the recording will print the final output all at once, without preserving timing information. Disabling mode is more realistic: the timing of each byte is preserved in the recording; this requires building a binary (which is slow) and injecting it into the target container (which could break).

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 exec --cmd string

func (m *myModule) example(cmd string) *Termcast  {
	return dag.
			Termcast().
			Exec(cmd)
}

@function
def example(cmd: str) -> dag.Termcast:
	return (
		dag.termcast()
		.exec(cmd)
	)

@func()
example(cmd: string): Termcast {
	return dag
		.termcast()
		.exec(cmd)
}

execEnv() 🔗

Build the execution environment for debugging purposes

Return Type

Container !

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 exec-env

func (m *myModule) example() *Container  {
	return dag.
			Termcast().
			ExecEnv()
}

@function
def example() -> dagger.Container:
	return (
		dag.termcast()
		.exec_env()
	)

@func()
example(): Container {
	return dag
		.termcast()
		.execEnv()
}

keystrokes() 🔗

Simulate a human typing text

Return Type

Termcast !

Arguments

Name	Type	Default Value	Description
data	String !	-	Data to input as keystrokes

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 keystrokes --data string

func (m *myModule) example(data string) *Termcast  {
	return dag.
			Termcast().
			Keystrokes(data)
}

@function
def example(data: str) -> dag.Termcast:
	return (
		dag.termcast()
		.keystrokes(data)
	)

@func()
example(data: string): Termcast {
	return dag
		.termcast()
		.keystrokes(data)
}

enter() 🔗

Simulate pressing the enter key

Return Type

Termcast !

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 enter

func (m *myModule) example() *Termcast  {
	return dag.
			Termcast().
			Enter()
}

@function
def example() -> dag.Termcast:
	return (
		dag.termcast()
		.enter()
	)

@func()
example(): Termcast {
	return dag
		.termcast()
		.enter()
}

backspace() 🔗

Simulate pressing the backspace key

Return Type

Termcast !

Arguments

Name	Type	Default Value	Description
repeat	Integer !	1	Number of backspaces

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 backspace --repeat integer

func (m *myModule) example(repeat int) *Termcast  {
	return dag.
			Termcast().
			Backspace(repeat)
}

@function
def example(repeat: int) -> dag.Termcast:
	return (
		dag.termcast()
		.backspace(repeat)
	)

@func()
example(repeat: number): Termcast {
	return dag
		.termcast()
		.backspace(repeat)
}

file() 🔗

Encode the recording to a file in the asciicast v2 format

Return Type

File !

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 file

func (m *myModule) example() *File  {
	return dag.
			Termcast().
			File()
}

@function
def example() -> dagger.File:
	return (
		dag.termcast()
		.file()
	)

@func()
example(): File {
	return dag
		.termcast()
		.file()
}

encode() 🔗

Encode the recording to a string in the asciicast v2 format

Return Type

String !

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 encode

func (m *myModule) example(ctx context.Context) string  {
	return dag.
			Termcast().
			Encode(ctx)
}

@function
async def example() -> str:
	return await (
		dag.termcast()
		.encode()
	)

@func()
async example(): Promise<string> {
	return dag
		.termcast()
		.encode()
}

play() 🔗

Return an interactive terminal that will play the recording, read-only.

Return Type

Void !

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 play

func (m *myModule) example(ctx context.Context)   {
	return dag.
			Termcast().
			Play(ctx)
}

@function
async def example() -> None:
	return await (
		dag.termcast()
		.play()
	)

@func()
async example(): Promise<void> {
	return dag
		.termcast()
		.play()
}

gif() 🔗

Encode the recording into an animated GIF files

Return Type

File !

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 gif

func (m *myModule) example() *File  {
	return dag.
			Termcast().
			Gif()
}

@function
def example() -> dagger.File:
	return (
		dag.termcast()
		.gif()
	)

@func()
example(): File {
	return dag
		.termcast()
		.gif()
}

decode() 🔗

Decode an asciicast v2 file, and add its contents to the end of the recording.

See https://docs.asciinema.org/manual/asciicast/v2/

Return Type

Termcast !

Arguments

Name	Type	Default Value	Description
data	String !	-	The data to decode, in asciicast format
expectHeader	Boolean !	true	Indicate whether the decoder should expect an asciicast header. If true, the decoder will parse (and discrd) the header, the load the events If false, the decoder will look for events directly

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 decode --data string --expect-header boolean

func (m *myModule) example(data string, expectHeader bool) *Termcast  {
	return dag.
			Termcast().
			Decode(data, expectHeader)
}

@function
def example(data: str, expect_header: bool) -> dag.Termcast:
	return (
		dag.termcast()
		.decode(data, expect_header)
	)

@func()
example(data: string, expectHeader: boolean): Termcast {
	return dag
		.termcast()
		.decode(data, expectHeader)
}

imagine() 🔗

Ask an AI to imagine a terminal session, and add it to the recording

Return Type

Termcast !

Arguments

Name	Type	Default Value	Description
prompt	String !	"surprise me! an epic interactive session with a shell, language repl or database repl of your choice. the more exotic the better. Not python!"	A description of the terminal session

Example

dagger -m github.com/shykes/x/termcast@b6da9888ed078e1573e9561b936dd1e5244f0a9f call \
 imagine --prompt string

func (m *myModule) example(prompt string) *Termcast  {
	return dag.
			Termcast().
			Imagine(prompt)
}

@function
def example(prompt: str) -> dag.Termcast:
	return (
		dag.termcast()
		.imagine(prompt)
	)

@func()
example(prompt: string): Termcast {
	return dag
		.termcast()
		.imagine(prompt)
}