View Source Mix.Shell behaviour (Mix v1.15.0-dev)

Defines Mix.Shell contract.

Link to this section Summary

Callbacks

Executes the given command and returns its exit status.

Executes the given command and returns its exit status.

Prints the given ANSI error to the shell.

Prints the given ANSI message to the shell.

Prints the current application to the shell if it was not printed yet.

Prompts the user for input.

Prompts the user for confirmation.

Prompts the user for confirmation.

Functions

Executes the given command as a shell command and invokes the callback for the streamed response.

Returns the printable app name.

Link to this section Callbacks

@callback cmd(command :: String.t()) :: integer()

Executes the given command and returns its exit status.

Shortcut for cmd/2 with empty options.

@callback cmd(command :: String.t(), options :: keyword()) :: integer()

Executes the given command and returns its exit status.

options

Options

  • :print_app - when false, does not print the app name when the command outputs something

  • :stderr_to_stdout - when false, does not redirect stderr to stdout

  • :quiet - when true, do not print the command output

  • :env - environment options to the executed command

@callback error(message :: IO.ANSI.ansidata()) :: :ok

Prints the given ANSI error to the shell.

@callback info(message :: IO.ANSI.ansidata()) :: :ok

Prints the given ANSI message to the shell.

@callback print_app() :: :ok

Prints the current application to the shell if it was not printed yet.

@callback prompt(message :: binary()) :: binary()

Prompts the user for input.

@callback yes?(message :: binary()) :: boolean()

Prompts the user for confirmation.

Shortcut for yes?/2 with empty options.

@callback yes?(message :: binary(), options :: keyword()) :: boolean()

Prompts the user for confirmation.

options

Options

  • :default - :yes or :no (the default is :yes)

Link to this section Functions

Link to this function

cmd(command, options \\ [], callback)

View Source

Executes the given command as a shell command and invokes the callback for the streamed response.

This is most commonly used by shell implementations but can also be invoked directly.

options

Options

  • :cd - (since v1.11.0) the directory to run the command in

  • :stderr_to_stdout - redirects stderr to stdout, defaults to true

  • :env - a list of environment variables, defaults to []

  • :quiet - overrides the callback to no-op

Returns the printable app name.

This function returns the current application name, but only if the application name should be printed.

Calling this function automatically toggles its value to false until the current project is re-entered. The goal is to avoid printing the application name multiple times.