Fixed bug - ignore path expressions that match a directory

acceptance_tests/basic.sh

@@ -10,6 +10,12 @@ testBasicEvalRoundTrip() {
   assertEquals 123 "$X"
 }
 
+testBasicPipeWithDot() {
+  ./yq -n ".a = 123" > test.yml
+  X=$(cat test.yml | ./yq '.')
+  assertEquals 123 "$X"
+}
+
 testBasicEvalRoundTripNoEval() {
   ./yq -n ".a = 123" > test.yml
   X=$(./yq '.a' test.yml)

cmd/utils.go

@@ -98,6 +98,6 @@ func configureEncoder(format yqlib.PrinterOutputFormat) yqlib.Encoder {
 // without this - yq detects there is stdin (thanks githubactions),
 // then tries to parse the filename as an expression
 func maybeFile(str string) bool {
-	_, err := os.Stat(str) // #nosec
-	return err == nil
+	stat, err := os.Stat(str) // #nosec
+	return err == nil && !stat.IsDir()
 }