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package main
import (
"bufio"
"encoding/base64"
"flag"
"fmt"
"github.com/gdamore/tcell/v2"
"golang.org/x/exp/slog"
"io"
"log"
"os"
"time"
)
func encode(fname string, encoder io.WriteCloser) {
var f *os.File
var err error
if fname == "-" {
f = os.Stdin
} else {
if f, err = os.Open(fname); err != nil {
log.Fatalf("Failed to open file %v: %v", fname, err)
} else {
defer f.Close()
}
}
if _, err = io.Copy(encoder, f); err != nil {
log.Fatal(err)
}
}
func opentty() (tty tcell.Tty, err error) {
tty, err = tcell.NewDevTty()
if err == nil {
err = tty.Start()
}
return
}
func closetty(tty tcell.Tty) {
tty.Drain()
tty.Stop()
tty.Close()
}
func _main() int {
var fnames []string
var err error
var exitCode int
flag.Usage = func() {
template := `Reads or writes the system clipboard using the ANSI OSC52 escape sequence.
Usage:
COPY mode (default):
%s [file1 [...fileN]]
With no arguments, will read from stdin.
PASTE mode:
%s --paste
Outputs clipboard contents to stdout.
Options:
`
fmt.Fprintf(flag.CommandLine.Output(), template, os.Args[0], os.Args[0])
flag.PrintDefaults()
}
var pasteFlag bool
var verboseFlag bool
var logfileFlag string
flag.BoolVar(&pasteFlag, "paste", pasteFlag, "paste operation")
flag.BoolVar(&verboseFlag, "verbose", verboseFlag, "verbose logging")
flag.BoolVar(&verboseFlag, "v", verboseFlag, "verbose logging")
flag.StringVar(&logfileFlag, "logFile", logfileFlag, "redirect logs to file")
flag.Parse()
logLevel := &slog.LevelVar{} // INFO
logOutput := os.Stdout
if logfileFlag != "" {
if logOutput, err = os.OpenFile(logfileFlag, os.O_APPEND|os.O_RDWR|os.O_CREATE, 0644); err != nil {
log.Fatalf("Failed to open file %v: %v", logfileFlag, err)
} else {
defer logOutput.Close()
}
}
if verboseFlag {
logLevel.Set(slog.LevelDebug)
}
logger := slog.New(slog.NewTextHandler(logOutput, &slog.HandlerOptions{
Level: logLevel,
}))
slog.SetDefault(logger)
slog.Debug("logging started")
if ti, err := tcell.LookupTerminfo(os.Getenv("TERM")); err != nil {
slog.Error("ERROR: failed to lookup terminfo: %s", err)
} else {
slog.Debug(fmt.Sprintf("term is: %s, aliases: %v", ti.Name, ti.Aliases))
}
if !pasteFlag {
// copy
if len(flag.Args()) > 0 {
fnames = flag.Args()
} else {
fnames = []string{"-"}
}
slog.Debug("Beginning osc52 copy operation")
func() {
tty, err := opentty()
if err != nil {
slog.Error("ERROR: opentty: %v", err)
exitCode = 1
return
}
defer closetty(tty)
// Open buffered output, using default max OSC52 length as buffer size
// TODO limit size
out := bufio.NewWriterSize(tty, 1000000)
// Start OSC52
fmt.Fprintf(out, "\x1b]52;c;")
b64 := base64.NewEncoder(base64.StdEncoding, out)
for _, fname := range fnames {
encode(fname, b64)
}
b64.Close()
// End OSC52
fmt.Fprintf(out, "\a")
out.Flush()
}()
slog.Debug("Ended osc52")
} else {
// paste
slog.Debug("Beginning osc52 paste operation")
data := func() []byte {
tty, err := opentty()
if err != nil {
slog.Error("ERROR: opentty: %v", err)
exitCode = 1
return nil
}
defer closetty(tty)
// Start OSC52
fmt.Fprintf(tty, "\x1b]52;c;?\a")
ttyReader := bufio.NewReader(tty)
buf := make([]byte, 0, 1024)
// time out intial read in 100 milliseconds
readChan := make(chan byte, 1)
defer close(readChan)
go func() {
if b, e := ttyReader.ReadByte(); e != nil {
slog.Debug("Initial ReadByte error:", e)
} else {
readChan <- b
}
}()
select {
case b := <-readChan:
buf = append(buf, b)
case <-time.After(100 * time.Millisecond):
slog.Debug("tty read timeout")
exitCode = 1
return nil
}
for {
if b, e := ttyReader.ReadByte(); e != nil {
slog.Error("ReadByte error: %v", e)
exitCode = 1
return nil
} else {
slog.Debug(fmt.Sprintf("Read: %x '%s'", b, string(b)))
// Terminator might be BEL (\a) or ESC-backslash (\x1b\\)
if b == '\a' {
break
}
buf = append(buf, b)
// Skip initial 7 bytes of response
if len(buf) > 9 && buf[len(buf)-2] == '\x1b' && buf[len(buf)-1] == '\\' {
buf = buf[:len(buf)-2]
break
}
}
}
slog.Debug("buf[:7]: %q", buf[:7])
buf = buf[7:]
decodedBuf := make([]byte, base64.StdEncoding.DecodedLen(len(buf)))
n, err := base64.StdEncoding.Decode(decodedBuf, []byte(buf))
if err != nil {
slog.Error("decode error: %v", err)
exitCode = 1
return nil
}
decodedBuf = decodedBuf[:n]
return decodedBuf
}()
if data != nil {
if _, err := os.Stdout.Write(data); err != nil {
slog.Error("Error writing to stdout: %v", err)
exitCode = 1
}
}
slog.Debug("Ended osc52")
}
return exitCode
}
func main() {
os.Exit(_main())
}
|
