Greatly reduce code duplication in clipboard implementations

src/offline/copy.go

@@ -0,0 +1,43 @@
+package offline
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func CopyArgument(targetLocation string, field int, executableName string) {
+	if isFile, _ := TargetIsFile(targetLocation, true, 2); isFile {
+
+		decryptedEntry := DecryptGPG(targetLocation)
+		var copySubject string // will store data to be copied
+
+		// ensure field exists in entry
+		if len(decryptedEntry) > field {
+			copySubject = decryptedEntry[field]
+		} else {
+			fmt.Println(AnsiError + "Field does not exist in entry" + AnsiReset)
+			os.Exit(1)
+		}
+
+		// ensure field is not blank
+		if copySubject == "" {
+			fmt.Println(AnsiError + "Field is empty" + AnsiReset)
+			os.Exit(1)
+		}
+
+		// copy field to clipboard, launch clipboard clearing process
+		copyField(copySubject, executableName)
+	}
+}
+
+func ClipClearArgument() {
+	// read previous clipboard contents from stdin
+	clipScanner := bufio.NewScanner(os.Stdin)
+	if clipScanner.Scan() {
+		oldContents := clipScanner.Text()
+		clipClear(oldContents)
+	} else {
+		os.Exit(0)
+	}
+}