clipboard_unix.go
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clipboard_unix.go
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	// Copyright 2013 @atotto. All rights reserved.
	// Use of this source code is governed by a BSD-style
	// license that can be found in the LICENSE file.

	// +build freebsd linux netbsd openbsd solaris dragonfly

	package clipboard

	import (
	"errors"
	"os/exec"
	)

	const (
	xsel = "xsel"
	xclip = "xclip"
	termuxClipboardGet = "termux-clipboard-get"
	termuxClipboardSet = "termux-clipboard-set"
	)

	var (
	Primary bool

	pasteCmdArgs []string
	copyCmdArgs []string

	xselPasteArgs = []string{xsel, "--output", "--clipboard"}
	xselCopyArgs = []string{xsel, "--input", "--clipboard"}

	xclipPasteArgs = []string{xclip, "-out", "-selection", "clipboard"}
	xclipCopyArgs = []string{xclip, "-in", "-selection", "clipboard"}

	termuxPasteArgs = []string{termuxClipboardGet}
	termuxCopyArgs = []string{termuxClipboardSet}

	missingCommands = errors.New("No clipboard utilities available. Please install xsel, xclip, or Termux:API add-on for termux-clipboard-get/set.")
	)

	func init() {
	pasteCmdArgs = xclipPasteArgs
	copyCmdArgs = xclipCopyArgs

	if _, err := exec.LookPath(xclip); err == nil {
	return
	}

	pasteCmdArgs = xselPasteArgs
	copyCmdArgs = xselCopyArgs

	if _, err := exec.LookPath(xsel); err == nil {
	return
	}

	pasteCmdArgs = termuxPasteArgs
	copyCmdArgs = termuxCopyArgs

	if _, err := exec.LookPath(termuxClipboardSet); err == nil {
	if _, err := exec.LookPath(termuxClipboardGet); err == nil {
	return
	}
	}

	Unsupported = true
	}

	func getPasteCommand() *exec.Cmd {
	if Primary {
	pasteCmdArgs = pasteCmdArgs[:1]
	}
	return exec.Command(pasteCmdArgs[0], pasteCmdArgs[1:]...)
	}

	func getCopyCommand() *exec.Cmd {
	if Primary {
	copyCmdArgs = copyCmdArgs[:1]
	}
	return exec.Command(copyCmdArgs[0], copyCmdArgs[1:]...)
	}

	func readAll() (string, error) {
	if Unsupported {
	return "", missingCommands
	}
	pasteCmd := getPasteCommand()
	out, err := pasteCmd.Output()
	if err != nil {
	return "", err
	}
	return string(out), nil
	}

	func writeAll(text string) error {
	if Unsupported {
	return missingCommands
	}
	copyCmd := getCopyCommand()
	in, err := copyCmd.StdinPipe()
	if err != nil {
	return err
	}

	if err := copyCmd.Start(); err != nil {
	return err
	}
	if _, err := in.Write([]byte(text)); err != nil {
	return err
	}
	if err := in.Close(); err != nil {
	return err
	}
	return copyCmd.Wait()
	}

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