forked from aptly-dev/aptly
/
progress.go
180 lines (159 loc) · 3.43 KB
/
progress.go
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package console
import (
"fmt"
"github.com/cheggaaa/pb"
"github.com/smira/aptly/aptly"
"github.com/wsxiaoys/terminal/color"
"strings"
)
const (
codePrint = iota
codeProgress
codeHideProgress
codeStop
codeFlush
)
type printTask struct {
code int
message string
reply chan bool
}
// Progress is a progress displaying subroutine, it allows to show download and other operations progress
// mixed with progress bar
type Progress struct {
stop chan bool
stopped chan bool
queue chan printTask
bar *pb.ProgressBar
barShown bool
}
// Check interface
var (
_ aptly.Progress = (*Progress)(nil)
)
// NewProgress creates new progress instance
func NewProgress() *Progress {
return &Progress{
stopped: make(chan bool),
queue: make(chan printTask, 100),
}
}
// Start makes progress start its work
func (p *Progress) Start() {
go p.worker()
}
// Shutdown shuts down progress display
func (p *Progress) Shutdown() {
p.ShutdownBar()
p.queue <- printTask{code: codeStop}
<-p.stopped
}
// Flush waits for all queued messages to be displayed
func (p *Progress) Flush() {
ch := make(chan bool)
p.queue <- printTask{code: codeFlush, reply: ch}
<-ch
}
// InitBar starts progressbar for count bytes or count items
func (p *Progress) InitBar(count int64, isBytes bool) {
if p.bar != nil {
panic("bar already initialized")
}
if RunningOnTerminal() {
p.bar = pb.New(0)
p.bar.Total = count
p.bar.NotPrint = true
p.bar.Callback = func(out string) {
p.queue <- printTask{code: codeProgress, message: out}
}
if isBytes {
p.bar.SetUnits(pb.U_BYTES)
p.bar.ShowSpeed = true
}
p.bar.Start()
}
}
// ShutdownBar stops progress bar and hides it
func (p *Progress) ShutdownBar() {
if p.bar == nil {
return
}
p.bar.Finish()
p.bar = nil
p.queue <- printTask{code: codeHideProgress}
}
// Write is implementation of io.Writer to support updating of progress bar
func (p *Progress) Write(s []byte) (int, error) {
if p.bar != nil {
p.bar.Add(len(s))
}
return len(s), nil
}
// AddBar increments progress for progress bar
func (p *Progress) AddBar(count int) {
if p.bar != nil {
p.bar.Add(count)
}
}
// SetBar sets current position for progress bar
func (p *Progress) SetBar(count int) {
if p.bar != nil {
p.bar.Set(count)
}
}
// Printf does printf but in safe manner: not overwriting progress bar
func (p *Progress) Printf(msg string, a ...interface{}) {
p.queue <- printTask{code: codePrint, message: fmt.Sprintf(msg, a...)}
}
// ColoredPrintf does printf in colored way + newline
func (p *Progress) ColoredPrintf(msg string, a ...interface{}) {
if RunningOnTerminal() {
p.queue <- printTask{code: codePrint, message: color.Sprintf(msg, a...) + "\n"}
} else {
// stip color marks
var prev rune
msg = strings.Map(func(r rune) rune {
if prev == '@' {
prev = 0
if r == '@' {
return r
}
return -1
}
prev = r
if r == '@' {
return -1
}
return r
}, msg)
p.Printf(msg+"\n", a...)
}
}
func (p *Progress) worker() {
for {
task := <-p.queue
switch task.code {
case codePrint:
if p.barShown {
fmt.Print("\r\033[2K")
p.barShown = false
}
fmt.Print(task.message)
case codeProgress:
if p.bar != nil {
fmt.Print("\r" + task.message)
p.barShown = true
}
case codeHideProgress:
if p.barShown {
fmt.Print("\r\033[2K")
p.barShown = false
}
case codeFlush:
task.reply <- true
case codeStop:
p.stopped <- true
return
}
}
}