term

Documentation

Index

• func IsTerminal(i interface{}) bool
• func NewMaxWidthWriter(w io.Writer, maxWidth uint) io.Writer
• func NewPunchCardWriter(w io.Writer) io.Writer
• func NewResponsiveWriter(w io.Writer) io.Writer
• func NewWordWrapWriter(w io.Writer, limit uint) io.Writer
• func SetSize(fd uintptr, size Size) error
• type SafeFunc
• type Size
  • func GetSize(fd uintptr) *Size
• type TTY
  • func (t TTY) GetSize() *Size
  • func (t TTY) IsTerminalIn() bool
  • func (t TTY) IsTerminalOut() bool
  • func (t *TTY) MonitorSize(initialSizes ...*Size) TerminalSizeQueue
  • func (t TTY) Safe(fn SafeFunc) error
• type TerminalSizeQueue

Functions

func IsTerminal

func IsTerminal(i interface{}) bool

IsTerminal returns whether the passed object is a terminal or not

func NewMaxWidthWriter

func NewMaxWidthWriter(w io.Writer, maxWidth uint) io.Writer

NewMaxWidthWriter is a Writer that supports a limit of characters on every line, but doesn't do any word wrapping automatically.

func NewPunchCardWriter

func NewPunchCardWriter(w io.Writer) io.Writer

NewPunchCardWriter is a NewWordWrapWriter that limits the line width to 80 columns.

func NewResponsiveWriter

func NewResponsiveWriter(w io.Writer) io.Writer

NewResponsiveWriter creates a Writer that detects the column width of the terminal we are in, and adjusts every line width to fit and use recommended terminal sizes for better readability. Does proper word wrapping automatically.

if terminal width >= 120 columns		use 120 columns
if terminal width >= 100 columns		use 100 columns
if terminal width >=  80 columns		use  80 columns

In case we're not in a terminal or if it's smaller than 80 columns width, doesn't do any wrapping.

func NewWordWrapWriter

func NewWordWrapWriter(w io.Writer, limit uint) io.Writer

NewWordWrapWriter is a Writer that supports a limit of characters on every line and does auto word wrapping that respects that limit.

func SetSize

func SetSize(fd uintptr, size Size) error

SetSize sets the terminal size associated with fd.

Types

type SafeFunc

type SafeFunc func() error

SafeFunc is a function to be invoked by TTY.

type Size

type Size struct {
	Width  uint16
	Height uint16
}

Size represents the width and height of a terminal.

func GetSize

func GetSize(fd uintptr) *Size

GetSize returns the current size of the terminal associated with fd.

type TTY

type TTY struct {
	// In is a reader representing stdin. It is a required field.
	In io.Reader
	// Out is a writer representing stdout. It must be set to support terminal resizing. It is an
	// optional field.
	Out io.Writer
	// Raw is true if the terminal should be set raw.
	Raw bool
	// TryDev indicates the TTY should try to open /dev/tty if the provided input
	// is not a file descriptor.
	TryDev bool
	// Parent is an optional interrupt handler provided to this function - if provided
	// it will be invoked after the terminal state is restored. If it is not provided,
	// a signal received during the TTY will result in os.Exit(0) being invoked.
	Parent *interrupt.Handler
	// contains filtered or unexported fields
}

TTY helps invoke a function and preserve the state of the terminal, even if the process is terminated during execution. It also provides support for terminal resizing for remote command execution/attachment.

func (TTY) GetSize

func (t TTY) GetSize() *Size

GetSize returns the current size of the user's terminal. If it isn't a terminal, nil is returned.

func (TTY) IsTerminalIn

func (t TTY) IsTerminalIn() bool

IsTerminalIn returns true if t.In is a terminal. Does not check /dev/tty even if TryDev is set.

func (TTY) IsTerminalOut

func (t TTY) IsTerminalOut() bool

IsTerminalOut returns true if t.Out is a terminal. Does not check /dev/tty even if TryDev is set.

func (*TTY) MonitorSize

func (t *TTY) MonitorSize(initialSizes ...*Size) TerminalSizeQueue

MonitorSize monitors the terminal's size. It returns a TerminalSizeQueue primed with initialSizes, or nil if there's no TTY present.

func (TTY) Safe

func (t TTY) Safe(fn SafeFunc) error

Safe invokes the provided function and will attempt to ensure that when the function returns (or a termination signal is sent) that the terminal state is reset to the condition it was in prior to the function being invoked. If t.Raw is true the terminal will be put into raw mode prior to calling the function. If the input file descriptor is not a TTY and TryDev is true, the /dev/tty file will be opened (if available).

type TerminalSizeQueue

type TerminalSizeQueue interface {
	// Next returns the new terminal size after the terminal has been resized. It returns nil when
	// monitoring has been stopped.
	Next() *Size
}

TerminalSizeQueue is capable of returning terminal resize events as they occur.