Return errors, rather than printing them

core/copyTERMUX.go

@@ -3,24 +3,24 @@
 package core
 
 import (
+	"errors"
 	"os/exec"
 
 	"github.com/rwinkhart/go-boilerplate/back"
-	"github.com/rwinkhart/libmutton/global"
 )
 
 // copyString copies a string to the clipboard.
-func copyString(continuous bool, copySubject string) {
+func copyString(continuous bool, copySubject string) error {
 	cmd := exec.Command("termux-clipboard-set")
 	back.WriteToStdin(cmd, copySubject)
 	err := cmd.Run()
 	if err != nil {
-		back.PrintError("Failed to copy to clipboard: "+err.Error(), global.ErrorClipboard, true)
+		return errors.New("unable to copy to clipboard: " + err.Error())
 	}
-
 	if !continuous {
 		LaunchClipClearProcess(copySubject)
 	}
+	return nil
 }
 
 // getClipCommands returns the commands for pasting and clearing the clipboard contents.