Rename "backend" package to "core"

core/edit.go

@@ -0,0 +1,25 @@
+package core
+
+// GetOldEntryData decrypts and returns old entry data (with all required lines present)
+func GetOldEntryData(targetLocation string, field int) []string {
+	// ensure targetLocation exists
+	TargetIsFile(targetLocation, true, 2)
+
+	// read old entry data
+	unencryptedEntry := DecryptGPG(targetLocation)
+
+	// return the old entry data with all required lines present
+	if field > 0 {
+		return EnsureSliceLength(unencryptedEntry, field)
+	} else {
+		return unencryptedEntry
+	}
+}
+
+// EnsureSliceLength ensures slice is long enough to contain the specified index
+func EnsureSliceLength(slice []string, index int) []string {
+	for len(slice) <= index {
+		slice = append(slice, "")
+	}
+	return slice
+}