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lib/terminal: factor from cmd/progress, swap Azure/go-ansiterm for mattn/go-colorable
This commit is contained in:
Nick Craig-Wood
parent
c78d1dd18b
commit
593de059be
@ -5,7 +5,6 @@ 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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@ -13,7 +12,7 @@ import (
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"github.com/rclone/rclone/fs"
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"github.com/rclone/rclone/fs/accounting"
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"github.com/rclone/rclone/fs/log"
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"golang.org/x/crypto/ssh/terminal"
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"github.com/rclone/rclone/lib/terminal"
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)
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const (
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@ -23,34 +22,10 @@ const (
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logTimeFormat = "2006-01-02 15:04:05"
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)
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var (
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initTerminal func() error
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writeToTerminal func([]byte)
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)
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// Initialise the VT100 terminal
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func initTerminalVT100() error {
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return nil
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}
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// Write to the VT100 terminal
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func writeToTerminalVT100(b []byte) {
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_, _ = os.Stdout.Write(b)
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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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if os.Getenv("TERM") != "" {
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initTerminal = initTerminalVT100
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writeToTerminal = writeToTerminalVT100
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}
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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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@ -88,13 +63,6 @@ func startProgress() func() {
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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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@ -107,11 +75,7 @@ func printProgress(logMessage string) {
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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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w, _ := terminal.GetSize()
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stats := strings.TrimSpace(accounting.GlobalStats().String())
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logMessage = strings.TrimSpace(logMessage)
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@ -121,17 +85,17 @@ func printProgress(logMessage string) {
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if logMessage != "" {
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out("\n")
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out(moveUp)
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out(terminal.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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out(terminal.EraseLine)
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out(terminal.MoveUp)
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}
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out(eraseLine)
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out(moveToStartOfLine)
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out(terminal.EraseLine)
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out(terminal.MoveToStartOfLine)
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if logMessage != "" {
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out(eraseLine)
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out(terminal.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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@ -145,5 +109,5 @@ func printProgress(logMessage string) {
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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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terminal.Write(buf.Bytes())
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}
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@ -1,9 +0,0 @@
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//+build !windows
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package cmd
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func init() {
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// Default terminal is VT100 for non Windows
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initTerminal = initTerminalVT100
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writeToTerminal = writeToTerminalVT100
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}
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@ -1,52 +0,0 @@
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//+build windows
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package cmd
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import (
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"fmt"
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"os"
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"syscall"
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ansiterm "github.com/Azure/go-ansiterm"
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"github.com/Azure/go-ansiterm/winterm"
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"github.com/pkg/errors"
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)
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var (
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ansiParser *ansiterm.AnsiParser
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)
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func init() {
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// Default terminal is Windows console for Windows
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initTerminal = initTerminalWindows
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writeToTerminal = writeToTerminalWindows
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}
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func initTerminalWindows() error {
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winEventHandler := winterm.CreateWinEventHandler(os.Stdout.Fd(), os.Stdout)
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if winEventHandler == nil {
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err := syscall.GetLastError()
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if err == nil {
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err = errors.New("initialization failed")
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}
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return errors.Wrap(err, "windows terminal")
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}
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ansiParser = ansiterm.CreateParser("Ground", winEventHandler)
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return nil
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}
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func writeToTerminalWindows(b []byte) {
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// Remove all non-ASCII characters until this is fixed
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// https://github.com/Azure/go-ansiterm/issues/26
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r := []rune(string(b))
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for i := range r {
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if r[i] >= 127 {
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r[i] = '.'
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}
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}
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b = []byte(string(r))
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_, err := ansiParser.Parse(b)
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if err != nil {
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_, _ = fmt.Fprintf(os.Stderr, "\n*** Error from ANSI parser: %v\n", err)
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}
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}
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111
lib/terminal/terminal.go
Normal file
111
lib/terminal/terminal.go
Normal file
@ -0,0 +1,111 @@
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// Package terminal provides VT100 terminal codes and a windows
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// implementation of that.
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package terminal
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import (
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"io"
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"os"
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"runtime"
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"sync"
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colorable "github.com/mattn/go-colorable"
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"golang.org/x/crypto/ssh/terminal"
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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[1G"
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MoveUp = "\x1b[1A"
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Reset = "\x1b[0m"
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Bright = "\x1b[1m"
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Dim = "\x1b[2m"
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Underscore = "\x1b[4m"
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Blink = "\x1b[5m"
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Reverse = "\x1b[7m"
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Hidden = "\x1b[8m"
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BlackFg = "\x1b[30m"
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RedFg = "\x1b[31m"
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GreenFg = "\x1b[32m"
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YellowFg = "\x1b[33m"
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BlueFg = "\x1b[34m"
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MagentaFg = "\x1b[35m"
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CyanFg = "\x1b[36m"
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WhiteFg = "\x1b[37m"
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BlackBg = "\x1b[40m"
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RedBg = "\x1b[41m"
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GreenBg = "\x1b[42m"
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YellowBg = "\x1b[43m"
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BlueBg = "\x1b[44m"
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MagentaBg = "\x1b[45m"
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CyanBg = "\x1b[46m"
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WhiteBg = "\x1b[47m"
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HiBlackFg = "\x1b[90m"
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HiRedFg = "\x1b[91m"
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HiGreenFg = "\x1b[92m"
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HiYellowFg = "\x1b[93m"
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HiBlueFg = "\x1b[94m"
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HiMagentaFg = "\x1b[95m"
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HiCyanFg = "\x1b[96m"
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HiWhiteFg = "\x1b[97m"
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HiBlackBg = "\x1b[100m"
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HiRedBg = "\x1b[101m"
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HiGreenBg = "\x1b[102m"
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HiYellowBg = "\x1b[103m"
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HiBlueBg = "\x1b[104m"
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HiMagentaBg = "\x1b[105m"
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HiCyanBg = "\x1b[106m"
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HiWhiteBg = "\x1b[107m"
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)
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var (
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// make sure that start is only called once
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once sync.Once
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)
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// Start the terminal - must be called before use
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func Start() {
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once.Do(func() {
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f := os.Stdout
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if !terminal.IsTerminal(int(f.Fd())) {
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// If stdout not a tty then remove escape codes
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Out = colorable.NewNonColorable(f)
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} else if runtime.GOOS == "windows" && os.Getenv("TERM") != "" {
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// If TERM is set just use stdout
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Out = f
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} else {
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Out = colorable.NewColorable(f)
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}
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})
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}
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// WriteString writes the string passed in to the terminal
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func WriteString(s string) {
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Write([]byte(s))
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}
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// GetSize reads the dimensions of the current terminal or returns a
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// sensible default
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func GetSize() (w, h int) {
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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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return w, h
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}
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// Out is an io.Writer which can be used to write to the terminal
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// eg for use with fmt.Fprintf(terminal.Out, "terminal fun: %d\n", n)
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var Out io.Writer
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// Write sends out to the VT100 terminal.
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// It will initialise the terminal if this is the first call.
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func Write(out []byte) {
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Start()
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_, _ = Out.Write(out)
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}
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