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// Copyright 2020 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package progress
import (
"fmt"
"io"
"os"
"os/signal"
"syscall"
"go.uber.org/atomic"
"golang.org/x/sys/unix"
)
var (
termSizeWidth = atomic.Int32{}
termSizeHeight = atomic.Int32{}
)
func updateTerminalSize() error {
ws, err := unix.IoctlGetWinsize(syscall.Stdout, unix.TIOCGWINSZ)
if err != nil {
return err
}
termSizeWidth.Store(int32(ws.Col))
termSizeHeight.Store(int32(ws.Row))
return nil
}
func moveCursorUp(w io.Writer, n int) {
_, _ = fmt.Fprintf(w, "\033[%dA", n)
}
func moveCursorDown(w io.Writer, n int) {
_, _ = fmt.Fprintf(w, "\033[%dB", n)
}
func moveCursorToLineStart(w io.Writer) {
_, _ = fmt.Fprintf(w, "\r")
}
func clearLine(w io.Writer) {
_, _ = fmt.Fprintf(w, "\033[2K")
}
func init() {
_ = updateTerminalSize()
sigCh := make(chan os.Signal, 1)
signal.Notify(sigCh, syscall.SIGWINCH)
go func() {
for {
if _, ok := <-sigCh; !ok {
return
}
_ = updateTerminalSize()
}
}()
}
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