131 lines
2.6 KiB
Go
131 lines
2.6 KiB
Go
// Show the dynamic progress bar
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package cmd
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import (
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"bytes"
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"fmt"
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"os"
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"strings"
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"sync"
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"time"
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"github.com/ncw/rclone/fs"
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"github.com/ncw/rclone/fs/accounting"
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"github.com/ncw/rclone/fs/log"
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"golang.org/x/crypto/ssh/terminal"
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)
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const (
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// interval between progress prints
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defaultProgressInterval = 500 * time.Millisecond
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// time format for logging
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logTimeFormat = "2006-01-02 15:04:05"
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)
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// startProgress starts the progress bar printing
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//
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// It returns a func which should be called to stop the stats.
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func startProgress() func() {
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err := initTerminal()
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if err != nil {
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fs.Errorf(nil, "Failed to start progress: %v", err)
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return func() {}
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}
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stopStats := make(chan struct{})
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oldLogPrint := fs.LogPrint
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if !log.Redirected() {
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// Intercept the log calls if not logging to file or syslog
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fs.LogPrint = func(level fs.LogLevel, text string) {
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printProgress(fmt.Sprintf("%s %-6s: %s", time.Now().Format(logTimeFormat), level, text))
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}
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}
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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defer wg.Done()
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progressInterval := defaultProgressInterval
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if ShowStats() && *statsInterval > 0 {
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progressInterval = *statsInterval
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}
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ticker := time.NewTicker(progressInterval)
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for {
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select {
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case <-ticker.C:
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printProgress("")
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case <-stopStats:
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ticker.Stop()
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printProgress("")
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fs.LogPrint = oldLogPrint
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fmt.Println("")
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return
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}
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}
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}()
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return func() {
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close(stopStats)
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wg.Wait()
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}
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}
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// VT100 codes
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const (
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eraseLine = "\x1b[2K"
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moveToStartOfLine = "\x1b[0G"
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moveUp = "\x1b[A"
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)
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// state for the progress printing
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var (
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nlines = 0 // number of lines in the previous stats block
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progressMu sync.Mutex
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)
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// printProgress prints the progress with an optional log
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func printProgress(logMessage string) {
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progressMu.Lock()
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defer progressMu.Unlock()
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var buf bytes.Buffer
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w, h, err := terminal.GetSize(int(os.Stdout.Fd()))
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if err != nil {
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w, h = 80, 25
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}
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_ = h
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stats := strings.TrimSpace(accounting.Stats.String())
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logMessage = strings.TrimSpace(logMessage)
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out := func(s string) {
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buf.WriteString(s)
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}
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if logMessage != "" {
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out("\n")
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out(moveUp)
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}
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// Move to the start of the block we wrote erasing all the previous lines
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for i := 0; i < nlines-1; i++ {
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out(eraseLine)
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out(moveUp)
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}
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out(eraseLine)
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out(moveToStartOfLine)
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if logMessage != "" {
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out(eraseLine)
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out(logMessage + "\n")
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}
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fixedLines := strings.Split(stats, "\n")
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nlines = len(fixedLines)
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for i, line := range fixedLines {
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if len(line) > w {
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line = line[:w]
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}
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out(line)
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if i != nlines-1 {
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out("\n")
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}
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}
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writeToTerminal(buf.Bytes())
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}
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