forked from folbricht/desync
/
progressbar.go
103 lines (89 loc) · 1.85 KB
/
progressbar.go
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package main
import (
"fmt"
"os"
"strings"
"sync"
"time"
"github.com/folbricht/desync"
"golang.org/x/crypto/ssh/terminal"
)
type ConsoleProgressBar struct {
prefix string
mu sync.Mutex
done chan (struct{})
total int
counter int
fd int
}
func NewProgressBar(total int, prefix string) desync.ProgressBar {
if !terminal.IsTerminal(int(os.Stderr.Fd())) {
return NullProgressBar{}
}
return &ConsoleProgressBar{prefix: prefix, total: total, done: make(chan (struct{}))}
}
func (p *ConsoleProgressBar) Add(n int) {
if p == nil {
return
}
p.mu.Lock()
defer p.mu.Unlock()
p.counter += n
if p.counter > p.total {
p.counter = p.total
}
}
func (p *ConsoleProgressBar) Set(n int) {
if p == nil {
return
}
p.mu.Lock()
defer p.mu.Unlock()
p.counter = n
if p.counter > p.total {
p.counter = p.total
}
}
func (p *ConsoleProgressBar) Start() {
if p == nil {
return
}
ticker := time.NewTicker(time.Millisecond * 500)
go func() {
loop:
for {
select {
case <-p.done:
break loop
case <-ticker.C:
p.draw()
}
}
}()
}
func (p *ConsoleProgressBar) Stop() {
if p == nil {
return
}
p.draw()
close(p.done)
}
func (p *ConsoleProgressBar) draw() {
p.mu.Lock()
defer p.mu.Unlock()
width, _, err := terminal.GetSize(int(os.Stderr.Fd()))
if err != nil || width <= len(p.prefix)+2 { // Is that a terminal and big enough?
return
}
progress := (width - len(p.prefix) - 2) * p.counter / p.total
blank := width - len(p.prefix) - 2 - progress
if progress < 0 || blank < 0 { // No need to panic if anything's off
return
}
fmt.Fprintf(os.Stderr, "\r%s|%s%s|", p.prefix, strings.Repeat("=", progress), strings.Repeat(" ", blank))
}
type NullProgressBar struct{}
func (p NullProgressBar) Add(n int) {}
func (p NullProgressBar) Set(n int) {}
func (p NullProgressBar) Start() {}
func (p NullProgressBar) Stop() {}