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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 (
"bufio"
"fmt"
"io"
"os"
"github.com/fatih/color"
"github.com/mattn/go-runewidth"
"go.uber.org/atomic"
)
type singleBarCore struct {
displayProps atomic.Value
spinnerFrame int
}
func (b *singleBarCore) renderDoneOrError(w io.Writer, dp *DisplayProps) {
width := int(termSizeWidth.Load())
var tail, detail string
var tailColor *color.Color
switch dp.Mode {
case ModeDone:
tail = doneTail
tailColor = colorDone
case ModeError:
tail = errorTail
tailColor = colorError
default:
panic("Unexpected dp.Mode")
}
var displayPrefix string
midWidth := 1 + 3 + 1 + len(tail)
prefixWidth := runewidth.StringWidth(dp.Prefix)
if midWidth+prefixWidth <= width || midWidth > width {
displayPrefix = dp.Prefix
} else {
displayPrefix = runewidth.Truncate(dp.Prefix, width-prefixWidth, "")
}
if len(dp.Detail) > 0 {
detail = ": " + dp.Detail
}
_, _ = fmt.Fprintf(w, "%s ... %s%s", displayPrefix, tailColor.Sprint(tail), detail)
}
func (b *singleBarCore) renderSpinner(w io.Writer, dp *DisplayProps) {
width := int(termSizeWidth.Load())
var displayPrefix, displaySuffix string
midWidth := 1 + 3 + 1 + 1 + 1
prefixWidth := runewidth.StringWidth(dp.Prefix)
suffixWidth := runewidth.StringWidth(dp.Suffix)
switch {
case midWidth+prefixWidth+suffixWidth <= width || midWidth > width:
// If screen is too small, do not fit it any more.
displayPrefix = dp.Prefix
displaySuffix = dp.Suffix
case midWidth+prefixWidth <= width:
displayPrefix = dp.Prefix
displaySuffix = runewidth.Truncate(dp.Suffix, width-midWidth-prefixWidth, "...")
default:
displayPrefix = runewidth.Truncate(dp.Prefix, width-midWidth, "")
displaySuffix = ""
}
_, _ = fmt.Fprintf(w, "%s ... %s %s",
displayPrefix,
colorSpinner.Sprintf("%c", spinnerText[b.spinnerFrame]),
displaySuffix)
b.spinnerFrame = (b.spinnerFrame + 1) % len(spinnerText)
}
func (b *singleBarCore) renderTo(w io.Writer) {
dp := (b.displayProps.Load()).(*DisplayProps)
if dp.Mode == ModeDone || dp.Mode == ModeError {
b.renderDoneOrError(w, dp)
} else {
b.renderSpinner(w, dp)
}
}
func newSingleBarCore(prefix string) singleBarCore {
c := singleBarCore{
displayProps: atomic.Value{},
spinnerFrame: 0,
}
c.displayProps.Store(&DisplayProps{
Prefix: prefix,
Mode: ModeSpinner,
})
return c
}
// SingleBar renders single progress bar.
type SingleBar struct {
core singleBarCore
renderer *renderer
}
// NewSingleBar creates a new SingleBar.
func NewSingleBar(prefix string) *SingleBar {
b := &SingleBar{
core: newSingleBarCore(prefix),
renderer: newRenderer(),
}
b.renderer.renderFn = b.render
return b
}
// UpdateDisplay updates the display property of this single bar.
// This function is thread safe.
func (b *SingleBar) UpdateDisplay(newDisplay *DisplayProps) {
b.core.displayProps.Store(newDisplay)
}
// StartRenderLoop starts the render loop.
// This function is thread safe.
func (b *SingleBar) StartRenderLoop() {
b.preRender()
b.renderer.startRenderLoop()
}
// StopRenderLoop stops the render loop.
// This function is thread safe.
func (b *SingleBar) StopRenderLoop() {
b.renderer.stopRenderLoop()
}
func (b *SingleBar) preRender() {
// Preserve space for the bar
fmt.Println("")
}
func (b *SingleBar) render() {
f := bufio.NewWriter(os.Stdout)
moveCursorUp(f, 1)
moveCursorToLineStart(f)
clearLine(f)
b.core.renderTo(f)
moveCursorDown(f, 1)
moveCursorToLineStart(f)
_ = f.Flush()
}
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