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// Copyright 2021 Northern.tech AS
//
// 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,
// 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.
package progressbar
// TODO -- Add terminal width respect
import (
"fmt"
"io"
"os"
"strings"
"github.com/mattn/go-isatty"
// "golang.org/x/sys/unix" - Do not add for now (split into minimal and not (?))
)
type Renderer interface {
Render(int) // Write the progressbar
}
type Bar struct {
Size int64
currentCount int64
Renderer
Percentage int
}
func New(size int64) *Bar {
if isatty.IsTerminal(os.Stderr.Fd()) {
return &Bar{
Renderer: &TTYRenderer{
Out: os.Stderr,
ProgressMarker: ".",
terminalWidth: 70,
},
Size: size,
}
} else {
return &Bar{
Renderer: &NoTTYRenderer{
Out: os.Stderr,
ProgressMarker: ".",
terminalWidth: 70,
},
Size: size,
}
}
}
func (b *Bar) Tick(n int64) {
b.currentCount += n
if b.Size > 0 {
percentage := int((float64(b.currentCount) / float64(b.Size)) * 100)
b.Percentage = percentage
b.Renderer.Render(percentage)
}
}
func (b *Bar) Reset() {
b.currentCount = 0
b.Renderer.Render(0)
}
func (b *Bar) Finish() {
b.Renderer.Render(100)
}
type TTYRenderer struct {
Out io.Writer // Output device
ProgressMarker string
terminalWidth int
lastPercentage int
}
func (p *TTYRenderer) Render(percentage int) {
if percentage <= p.lastPercentage {
return
}
suffix := fmt.Sprintf(" - %3d %%", percentage)
widthAvailable := p.terminalWidth - len(suffix)
number_of_dots := int((float64(widthAvailable) * float64(percentage)) / 100)
number_of_fillers := widthAvailable - number_of_dots
if percentage > 100 {
number_of_dots = widthAvailable
number_of_fillers = 0
}
if percentage < 0 {
return
}
if number_of_dots < 0 {
return
}
if number_of_fillers < 0 {
return
}
p.lastPercentage = percentage
fmt.Fprintf(p.Out, "\r%s%s%s",
strings.Repeat(p.ProgressMarker, number_of_dots),
strings.Repeat(" ", number_of_fillers),
suffix)
if percentage == 100 {
fmt.Fprintln(p.Out)
}
}
type NoTTYRenderer struct {
Out io.Writer // Output device
ProgressMarker string
lastNumberOfDots int
terminalWidth int
headerPrinted bool
}
func (p *NoTTYRenderer) Render(percentage int) {
if p.lastNumberOfDots >= p.terminalWidth {
return
}
if !p.headerPrinted {
// width, evenly distributed in half, taken away the characters
// 0%,50% & 100%
w := (p.terminalWidth - 2 - 3 - 4) / 2
fmt.Fprintf(p.Out, "0%%%[1]*s50%%%[1]*[2]s100%%\n", w, " ")
fmt.Fprintf(p.Out, "|%s|%[1]s|\n", strings.Repeat("-", (p.terminalWidth-3)/2))
p.headerPrinted = true
}
slope := float64(p.terminalWidth) / 100
fx := slope * float64(percentage)
if int(fx) > p.lastNumberOfDots {
numberOfDots := int(fx) - p.lastNumberOfDots
str := strings.Repeat(p.ProgressMarker, numberOfDots)
if numberOfDots+p.lastNumberOfDots > p.terminalWidth {
// Print only the difference
str = strings.Repeat(p.ProgressMarker, p.terminalWidth-p.lastNumberOfDots)
numberOfDots = p.terminalWidth - p.lastNumberOfDots
}
p.lastNumberOfDots += numberOfDots
fmt.Fprintf(p.Out, str)
}
}
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