Struct cargo::core::shell::Shell

pub struct Shell {
    output: ShellOut,
    verbosity: Verbosity,
    needs_clear: bool,
}

An abstraction around console output that remembers preferences for output verbosity and color.

Fields

output: ShellOut

Wrapper around stdout/stderr. This helps with supporting sending output to a memory buffer which is useful for tests.

verbosity: Verbosity

How verbose messages should be.

needs_clear: bool

Flag that indicates the current line needs to be cleared before printing. Used when a progress bar is currently displayed.

Implementations

impl Shell

pub fn new() -> Shell

Creates a new shell (color choice and verbosity), defaulting to ‘auto’ color and verbose output.

pub fn from_write(out: Box<dyn Write>) -> Shell

Creates a shell from a plain writable object, with no color, and max verbosity.

fn print( &mut self, status: &dyn Display, message: Option<&dyn Display>, color: &Style, justified: bool ) -> CargoResult<()>

Prints a message, where the status will have color color, and can be justified. The messages follows without color.

pub fn set_needs_clear(&mut self, needs_clear: bool)

Sets whether the next print should clear the current line.

pub fn is_cleared(&self) -> bool

Returns true if the needs_clear flag is unset.

pub fn err_width(&self) -> TtyWidth

Returns the width of the terminal in spaces, if any.

pub fn is_err_tty(&self) -> bool

Returns true if stderr is a tty.

pub fn out(&mut self) -> &mut dyn Write

Gets a reference to the underlying stdout writer.

pub fn err(&mut self) -> &mut dyn Write

Gets a reference to the underlying stderr writer.

pub fn err_erase_line(&mut self)

Erase from cursor to end of line.

pub fn status<T, U>(&mut self, status: T, message: U) -> CargoResult<()>where T: Display, U: Display,

Shortcut to right-align and color green a status message.

pub fn status_header<T>(&mut self, status: T) -> CargoResult<()>where T: Display,

pub fn status_with_color<T, U>( &mut self, status: T, message: U, color: &Style ) -> CargoResult<()>where T: Display, U: Display,

Shortcut to right-align a status message.

pub fn verbose<F>(&mut self, callback: F) -> CargoResult<()>where F: FnMut(&mut Shell) -> CargoResult<()>,

Runs the callback only if we are in verbose mode.

pub fn concise<F>(&mut self, callback: F) -> CargoResult<()>where F: FnMut(&mut Shell) -> CargoResult<()>,

Runs the callback if we are not in verbose mode.

pub fn error<T: Display>(&mut self, message: T) -> CargoResult<()>

Prints a red ‘error’ message.

pub fn warn<T: Display>(&mut self, message: T) -> CargoResult<()>

Prints an amber ‘warning’ message.

pub fn note<T: Display>(&mut self, message: T) -> CargoResult<()>

Prints a cyan ‘note’ message.

pub fn set_verbosity(&mut self, verbosity: Verbosity)

Updates the verbosity of the shell.

pub fn verbosity(&self) -> Verbosity

Gets the verbosity of the shell.

pub fn set_color_choice(&mut self, color: Option<&str>) -> CargoResult<()>

Updates the color choice (always, never, or auto) from a string..

pub fn color_choice(&self) -> ColorChoice

Gets the current color choice.

If we are not using a color stream, this will always return Never, even if the color choice has been set to something else.

pub fn err_supports_color(&self) -> bool

Whether the shell supports color.

pub fn out_supports_color(&self) -> bool

pub fn write_stdout( &mut self, fragment: impl Display, color: &Style ) -> CargoResult<()>

Write a styled fragment

Caller is responsible for deciding whether Shell::verbosity is affects output.

pub fn write_stderr( &mut self, fragment: impl Display, color: &Style ) -> CargoResult<()>

Write a styled fragment

Caller is responsible for deciding whether Shell::verbosity is affects output.

pub fn print_ansi_stderr(&mut self, message: &[u8]) -> CargoResult<()>

Prints a message to stderr and translates ANSI escape code into console colors.

pub fn print_ansi_stdout(&mut self, message: &[u8]) -> CargoResult<()>

Prints a message to stdout and translates ANSI escape code into console colors.

pub fn print_json<T: Serialize>(&mut self, obj: &T) -> CargoResult<()>

Trait Implementations

impl Debug for Shell

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Shell

fn default() -> Self

Returns the “default value” for a type.

impl ShellExt for Shell

fn dirty_because(&mut self, unit: &Unit, s: impl Display) -> CargoResult<()>

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 64 bytes