bump gocui

vendor/github.com/gdamore/tcell/v2/tscreen_unix.go

@@ -0,0 +1,123 @@
+// Copyright 2021 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
+
+package tcell
+
+import (
+	"errors"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"golang.org/x/term"
+)
+
+// engage is used to place the terminal in raw mode and establish screen size, etc.
+// Thing of this is as tcell "engaging" the clutch, as it's going to be driving the
+// terminal interface.
+func (t *tScreen) engage() error {
+	t.Lock()
+	defer t.Unlock()
+	if t.stopQ != nil {
+		return errors.New("already engaged")
+	}
+	if _, err := term.MakeRaw(int(t.in.Fd())); err != nil {
+		return err
+	}
+	if w, h, err := term.GetSize(int(t.in.Fd())); err == nil && w != 0 && h != 0 {
+		t.cells.Resize(w, h)
+	}
+	stopQ := make(chan struct{})
+	t.stopQ = stopQ
+	t.nonBlocking(false)
+	t.enableMouse(t.mouseFlags)
+	t.enablePasting(t.pasteEnabled)
+	signal.Notify(t.sigwinch, syscall.SIGWINCH)
+
+	t.wg.Add(2)
+	go t.inputLoop(stopQ)
+	go t.mainLoop(stopQ)
+	return nil
+}
+
+// disengage is used to release the terminal back to support from the caller.
+// Think of this as tcell disengaging the clutch, so that another application
+// can take over the terminal interface.  This restores the TTY mode that was
+// present when the application was first started.
+func (t *tScreen) disengage() {
+
+	t.Lock()
+	t.nonBlocking(true)
+	stopQ := t.stopQ
+	t.stopQ = nil
+	close(stopQ)
+	t.Unlock()
+
+	// wait for everything to shut down
+	t.wg.Wait()
+
+	signal.Stop(t.sigwinch)
+
+	// put back normal blocking mode
+	t.nonBlocking(false)
+
+	// shutdown the screen and disable special modes (e.g. mouse and bracketed paste)
+	ti := t.ti
+	t.cells.Resize(0, 0)
+	t.TPuts(ti.ShowCursor)
+	t.TPuts(ti.AttrOff)
+	t.TPuts(ti.Clear)
+	t.TPuts(ti.ExitCA)
+	t.TPuts(ti.ExitKeypad)
+	t.enableMouse(0)
+	t.enablePasting(false)
+
+	// restore the termios that we were started with
+	_ = term.Restore(int(t.in.Fd()), t.saved)
+
+}
+
+// initialize is used at application startup, and sets up the initial values
+// including file descriptors used for terminals and saving the initial state
+// so that it can be restored when the application terminates.
+func (t *tScreen) initialize() error {
+	var err error
+	t.out = os.Stdout
+	t.in = os.Stdin
+	t.saved, err = term.GetState(int(os.Stdin.Fd()))
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// finalize is used to at application shutdown, and restores the terminal
+// to it's initial state.  It should not be called more than once.
+func (t *tScreen) finalize() {
+
+	t.disengage()
+}
+
+// getWinSize is called to obtain the terminal dimensions.
+func (t *tScreen) getWinSize() (int, int, error) {
+	return term.GetSize(int(t.in.Fd()))
+}
+
+// Beep emits a beep to the terminal.
+func (t *tScreen) Beep() error {
+	t.writeString(string(byte(7)))
+	return nil
+}