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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"
// "golang.org/x/sys/unix"
)
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() {
var fnames []string
var err error
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 !pasteFlag {
// copy
if len(flag.Args()) > 0 {
fnames = flag.Args()
} else {
fnames = []string{"-"}
}
tty, err := opentty()
if err != nil {
slog.Error("ERROR: opentty:", err)
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
slog.Debug("Beginning osc52 copy operation")
fmt.Fprintf(out, "\033]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
data := func() []byte {
tty, err := opentty()
if err != nil {
slog.Error("ERROR: opentty:", err)
return nil
}
defer closetty(tty)
// Start OSC52
slog.Debug("Beginning osc52 paste operation")
fmt.Fprintf(tty, "\033]52;c;?\a")
ttyReader := bufio.NewReader(tty)
buf := make([]byte, 0, 1024)
for {
if b, err := ttyReader.ReadByte(); err != nil {
slog.Error("ReadByte error:", err)
return nil
} else {
slog.Debug(fmt.Sprintf("Read: %x '%s'", b, string(b)))
if b == '\a' {
break
}
buf = append(buf, b)
if len(buf) > 2 && buf[len(buf)-2] == '\033' && buf[len(buf)-1] == '\\' {
buf = buf[:len(buf)-2]
break
}
}
}
// buf, err := ttyReader.ReadBytes('\a')
// if err != nil {
// slog.Error("Read error:", err)
// return nil
// }
// slog.Debug("Read %d bytes, %x\n", len(buf), buf)
// fmt.Fprintf(os.Stderr, "buf[:7]: %q\n", buf[:7])
// fmt.Fprintf(os.Stderr, "buf[len(buf)-1]: %q\n", buf[len(buf)-1])
// fmt.Fprintf(os.Stderr, "%x\n", buf)
buf = buf[7:]
// fmt.Fprintf(os.Stderr, "%x\n", buf)
dst := make([]byte, base64.StdEncoding.DecodedLen(len(buf)))
n, err := base64.StdEncoding.Decode(dst, []byte(buf))
if err != nil {
slog.Error("decode error:", err)
return nil
}
dst = dst[:n]
return dst
}()
if data != nil {
if _, err := os.Stdout.Write(data); err != nil {
slog.Error("Error writing to stdout:", err)
}
}
slog.Debug("Ended osc52")
}
}
|
