README
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Go terminal/console support
This repository provides Go terminal and console support packages.
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The git repository is https://go.googlesource.com/term.
The main issue tracker for the term repository is located at https://go.dev/issues. Prefix your issue with "x/term:" in the subject line, so it is easy to find.
Documentation
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Overview ¶
Package term provides support functions for dealing with terminals, as commonly found on UNIX systems.
Putting a terminal into raw mode is the most common requirement:
oldState, err := term.MakeRaw(int(os.Stdin.Fd()))
if err != nil {
panic(err)
}
defer term.Restore(int(os.Stdin.Fd()), oldState)
Note that on non-Unix systems os.Stdin.Fd() may not be 0.
Index ¶
- Variables
- func GetSize(fd int) (width, height int, err error)
- func IsTerminal(fd int) bool
- func ReadPassword(fd int) ([]byte, error)
- func Restore(fd int, oldState *State) error
- type EscapeCodes
- type History
- type State
- type Terminal
- func (t *Terminal) ReadLine() (line string, err error)
- func (t *Terminal) ReadPassword(prompt string) (line string, err error)
- func (t *Terminal) SetBracketedPasteMode(on bool)
- func (t *Terminal) SetPrompt(prompt string)
- func (t *Terminal) SetSize(width, height int) error
- func (t *Terminal) Write(buf []byte) (n int, err error)
Constants ¶
This section is empty.
Variables ¶
var ErrPasteIndicator = pasteIndicatorError{}
ErrPasteIndicator may be returned from ReadLine as the error, in addition to valid line data. It indicates that bracketed paste mode is enabled and that the returned line consists only of pasted data. Programs may wish to interpret pasted data more literally than typed data.
Functions ¶
func GetSize ¶
GetSize returns the visible dimensions of the given terminal.
These dimensions don't include any scrollback buffer height.
func IsTerminal ¶
IsTerminal returns whether the given file descriptor is a terminal.
func ReadPassword ¶
ReadPassword reads a line of input from a terminal without local echo. This is commonly used for inputting passwords and other sensitive data. The slice returned does not include the \n.
Types ¶
type EscapeCodes ¶
type EscapeCodes struct {
// Foreground colors
Black, Red, Green, Yellow, Blue, Magenta, Cyan, White []byte
// Reset all attributes
Reset []byte
}
EscapeCodes contains escape sequences that can be written to the terminal in order to achieve different styles of text.
type History ¶ added in v0.32.0
type History interface {
// Add will be called by [Terminal.ReadLine] to add
// a new, most recent entry to the history.
// It is allowed to drop any entry, including
// the entry being added (e.g., if it's deemed an invalid entry),
// the least-recent entry (e.g., to keep the history bounded),
// or any other entry.
Add(entry string)
// Len returns the number of entries in the history.
Len() int
// At returns an entry from the history.
// Index 0 is the most-recently added entry and
// index Len()-1 is the least-recently added entry.
// If index is < 0 or >= Len(), it panics.
At(idx int) string
}
A History provides a (possibly bounded) queue of input lines read by Terminal.ReadLine.
type State ¶
type State struct {
// contains filtered or unexported fields
}
State contains the state of a terminal.
type Terminal ¶
type Terminal struct {
// AutoCompleteCallback, if non-null, is called for each keypress with
// the full input line and the current position of the cursor (in
// bytes, as an index into |line|). If it returns ok=false, the key
// press is processed normally. Otherwise it returns a replacement line
// and the new cursor position.
//
// This will be disabled during ReadPassword.
AutoCompleteCallback func(line string, pos int, key rune) (newLine string, newPos int, ok bool)
// Escape contains a pointer to the escape codes for this terminal.
// It's always a valid pointer, although the escape codes themselves
// may be empty if the terminal doesn't support them.
Escape *EscapeCodes
// History records and retrieves lines of input read by [ReadLine] which
// a user can retrieve and navigate using the up and down arrow keys.
//
// It is not safe to call ReadLine concurrently with any methods on History.
//
// [NewTerminal] sets this to a default implementation that records the
// last 100 lines of input.
History History
// contains filtered or unexported fields
}
Terminal contains the state for running a VT100 terminal that is capable of reading lines of input.
func NewTerminal ¶
func NewTerminal(c io.ReadWriter, prompt string) *Terminal
NewTerminal runs a VT100 terminal on the given ReadWriter. If the ReadWriter is a local terminal, that terminal must first have been put into raw mode. prompt is a string that is written at the start of each input line (i.e. "> ").
func (*Terminal) ReadPassword ¶
ReadPassword temporarily changes the prompt and reads a password, without echo, from the terminal.
The AutoCompleteCallback is disabled during this call.
func (*Terminal) SetBracketedPasteMode ¶
SetBracketedPasteMode requests that the terminal bracket paste operations with markers. Not all terminals support this but, if it is supported, then enabling this mode will stop any autocomplete callback from running due to pastes. Additionally, any lines that are completely pasted will be returned from ReadLine with the error set to ErrPasteIndicator.
Source Files