Implement clipboard clearing functionality on Wayland

src/offline/copy.go

@@ -5,24 +5,60 @@ import (
 	"io"
 	"os"
 	"os/exec"
+	"strings"
+	"time"
 )
 
-func CopyField(targetLocation string, field uint8) {
+// TODO Handle cmd.Run errors, especially those due to missing clipboard utilities
+
+// CopyField copies a field from an entry to the clipboard
+// TODO Implement support for Windows via powershell, MacOS via pbcopy, Termux via termux-clipboard-set, X11 via xclip
+// TODO Monitor Go support for Haiku, if possible implement support via clipboard command
+func CopyField(targetLocation string, field uint8, executableName string) {
 	if isFile, _ := TargetIsFile(targetLocation, true); isFile {
 		copySubject := DecryptGPG(targetLocation)[field]
+
+		//hash := getSha512Sum(copySubject)
+
 		cmd := exec.Command("wl-copy")
-		stdin, _ := cmd.StdinPipe()
-		go func() {
-			defer stdin.Close()
-			io.WriteString(stdin, copySubject)
-		}()
+		writeToStdin(cmd, copySubject)
 		cmd.Run()
+
+		// TODO Unpair from mutn, as this breaks library functionality
+		// TODO Maybe use this method for mutn and strongly encourage other implementations to support a clipclear argument
+		// TODO If an implementation opts out of doing this, this may error out
+		//cmd = exec.Command(executableName, "clipclear", hash)
+		cmd = exec.Command(executableName, "clipclear")
+		writeToStdin(cmd, copySubject)
+		cmd.Start()
+
 	} else {
 		fmt.Println(AnsiError + "Failed to read \"" + targetLocation + "\" - it is a directory" + AnsiReset)
 	}
 	os.Exit(0)
 }
 
-func clipClear() {
+// ClipClear is called in a separate process to clear the clipboard after 30 seconds
+// TODO Implement support for Windows via powershell, MacOS via pbcopy, Termux via termux-clipboard-set, X11 via xclip
+// TODO Make clear time period configurable
+func ClipClear(oldContents string) {
+	time.Sleep(30 * time.Second)
 
+	cmd := exec.Command("wl-paste")
+	newContents, _ := cmd.Output()
+
+	if oldContents == strings.TrimRight(string(newContents), "\n") {
+		cmd := exec.Command("wl-copy", "-c")
+		cmd.Run()
+	}
+	os.Exit(0)
+}
+
+// writeToStdin writes a string to a command's stdin
+func writeToStdin(cmd *exec.Cmd, input string) {
+	stdin, _ := cmd.StdinPipe()
+	go func() {
+		defer stdin.Close()
+		io.WriteString(stdin, input)
+	}()
 }