Implement moveto and copyto commands for choosing a destination name on copy/move

Fixes #227
Fixes #476

cmd/cmd_test.go

@@ -0,0 +1,28 @@
+package cmd
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRemoteSplit(t *testing.T) {
+
+	for _, test := range []struct {
+		remote, wantParent, wantLeaf string
+	}{
+		{"", "", ""},
+		{"remote:", "", ""},
+		{"remote:potato", "remote:", "potato"},
+		{"remote:potato/sausage", "remote:potato", "sausage"},
+		{"/", "", ""},
+		{"/root", "/", "root"},
+		{"/a/b", "/a", "b"},
+		{"root", ".", "root"},
+		{"a/b", "a", "b"},
+	} {
+		gotParent, gotLeaf := RemoteSplit(test.remote)
+		assert.Equal(t, test.wantParent, gotParent, test.remote)
+		assert.Equal(t, test.wantLeaf, gotLeaf, test.remote)
+	}
+}