mirror of
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7a72b6346a
Non-portable ones are moved into new packages pkg/sys/e{unix windows}. The "e"
prefix is needed to avoid conflict with packages under golang.org/x/sys/ and can
mean "extra".
120 lines
2.7 KiB
Go
120 lines
2.7 KiB
Go
package cli
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import (
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"fmt"
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"os"
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"os/signal"
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"sync"
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"src.elv.sh/pkg/cli/term"
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"src.elv.sh/pkg/sys"
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)
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// TTY is the type the terminal dependency of the editor needs to satisfy.
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type TTY interface {
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// Setup sets up the terminal for the CLI app.
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//
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// This method returns a restore function that undoes the setup, and any
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// error during setup. It only returns fatal errors that make the terminal
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// unsuitable for later operations; non-fatal errors may be reported by
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// showing a warning message, but not returned.
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//
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// This method should be called before any other method is called.
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Setup() (restore func(), err error)
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// ReadEvent reads a terminal event.
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ReadEvent() (term.Event, error)
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// SetRawInput requests the next n ReadEvent calls to read raw events. It
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// is applicable to environments where events are represented as a special
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// sequences, such as VT100. It is a no-op if events are delivered as whole
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// units by the terminal, such as Windows consoles.
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SetRawInput(n int)
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// CloseReader releases resources allocated for reading terminal events.
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CloseReader()
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term.Writer
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// NotifySignals start relaying signals and returns a channel on which
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// signals are delivered.
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NotifySignals() <-chan os.Signal
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// StopSignals stops the relaying of signals. After this function returns,
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// the channel returned by NotifySignals will no longer deliver signals.
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StopSignals()
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// Size returns the height and width of the terminal.
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Size() (h, w int)
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}
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type aTTY struct {
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in, out *os.File
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r term.Reader
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term.Writer
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sigCh chan os.Signal
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rawMutex sync.Mutex
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raw int
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}
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// NewTTY returns a new TTY from input and output terminal files.
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func NewTTY(in, out *os.File) TTY {
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return &aTTY{in: in, out: out, Writer: term.NewWriter(out)}
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}
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func (t *aTTY) Setup() (func(), error) {
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restore, err := term.Setup(t.in, t.out)
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return func() {
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err := restore()
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if err != nil {
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fmt.Println(t.out, "failed to restore terminal properties:", err)
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}
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}, err
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}
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func (t *aTTY) Size() (h, w int) {
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return sys.WinSize(t.out)
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}
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func (t *aTTY) ReadEvent() (term.Event, error) {
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if t.r == nil {
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t.r = term.NewReader(t.in)
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}
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if t.consumeRaw() {
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return t.r.ReadRawEvent()
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}
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return t.r.ReadEvent()
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}
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func (t *aTTY) consumeRaw() bool {
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t.rawMutex.Lock()
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defer t.rawMutex.Unlock()
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if t.raw <= 0 {
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return false
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}
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t.raw--
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return true
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}
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func (t *aTTY) SetRawInput(n int) {
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t.rawMutex.Lock()
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defer t.rawMutex.Unlock()
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t.raw = n
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}
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func (t *aTTY) CloseReader() {
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if t.r != nil {
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t.r.Close()
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}
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t.r = nil
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}
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func (t *aTTY) NotifySignals() <-chan os.Signal {
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t.sigCh = sys.NotifySignals()
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return t.sigCh
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}
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func (t *aTTY) StopSignals() {
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signal.Stop(t.sigCh)
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close(t.sigCh)
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t.sigCh = nil
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}
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