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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"
"os"
"strings"
"github.com/mattn/go-runewidth"
)
// MultiBarItem controls a bar item inside MultiBar.
type MultiBarItem struct {
core singleBarCore
}
// UpdateDisplay updates the display property of this bar item.
// This function is thread safe.
func (i *MultiBarItem) UpdateDisplay(newDisplay *DisplayProps) {
i.core.displayProps.Store(newDisplay)
}
// MultiBar renders multiple progress bars.
type MultiBar struct {
prefix string
bars []*MultiBarItem
renderer *renderer
}
// NewMultiBar creates a new MultiBar.
func NewMultiBar(prefix string) *MultiBar {
b := &MultiBar{
prefix: prefix,
bars: make([]*MultiBarItem, 0),
renderer: newRenderer(),
}
b.renderer.renderFn = b.render
return b
}
// AddBar adds a new bar item.
// This function is not thread safe. Must be called before render loop is started.
func (b *MultiBar) AddBar(prefix string) *MultiBarItem {
i := &MultiBarItem{
core: newSingleBarCore(prefix),
}
b.bars = append(b.bars, i)
return i
}
// StartRenderLoop starts the render loop.
// This function is thread safe.
func (b *MultiBar) StartRenderLoop() {
b.preRender()
b.renderer.startRenderLoop()
}
// StopRenderLoop stops the render loop.
// This function is thread safe.
func (b *MultiBar) StopRenderLoop() {
b.renderer.stopRenderLoop()
}
func (b *MultiBar) preRender() {
// Preserve space for the bar
fmt.Print(strings.Repeat("\n", len(b.bars)+1))
}
func (b *MultiBar) render() {
f := bufio.NewWriter(os.Stdout)
y := int(termSizeHeight.Load()) - 1
movedY := 0
for i := len(b.bars) - 1; i >= 0; i-- {
moveCursorUp(f, 1)
y--
movedY++
bar := b.bars[i]
moveCursorToLineStart(f)
clearLine(f)
bar.core.renderTo(f)
if y == 0 {
break
}
}
// render multi bar prefix
if y > 0 {
moveCursorUp(f, 1)
movedY++
moveCursorToLineStart(f)
clearLine(f)
width := int(termSizeWidth.Load())
prefix := runewidth.Truncate(b.prefix, width, "...")
_, _ = fmt.Fprint(f, prefix)
}
moveCursorDown(f, movedY)
moveCursorToLineStart(f)
clearLine(f)
_ = f.Flush()
}
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