Fixed merge comment issue #919

acceptance_tests/leading-seperator.sh

@@ -296,6 +296,35 @@ EOM
   assertEquals "$expected" "$X"
 }
 
+# https://github.com/mikefarah/yq/issues/919
+testLeadingSeparatorDoesNotBreakCommentsOnOtherFiles() {
+  cat >test.yml <<EOL
+# a1
+a: 1
+# a2
+EOL
+
+cat >test2.yml <<EOL
+# b1
+b: 2
+# b2
+EOL
+
+  read -r -d '' expected << EOM
+# a1
+a: 1
+# a2
+
+# b1
+b: 2
+# b2
+EOM
+
+
+  X=$(./yq ea 'select(fi == 0) * select(fi == 1)' test.yml test2.yml)
+  assertEquals "$expected" "$X"
+}
+
 testLeadingSeperatorMultiDocEvalCommentsStripComments() {
   cat >test.yml <<EOL
 ---

examples/data1.yaml

@@ -1,4 +1,3 @@
-a: simple # just the best
-b: [1, 2]
-c:
-  test: 1
+# a1
+a: 1
+# a2

examples/data2.yaml

@@ -1,7 +1,3 @@
-a: other # better than the original
-b: [3, 4]
-c:
-  toast: leave
-  test: 1
-  tell: 1
-  tasty.taco: cool
+#b1 
+b: 2
+#b2

pkg/yqlib/all_at_once_evaluator.go

@@ -52,7 +52,7 @@ func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string
 
 	var allDocuments *list.List = list.New()
 	for _, filename := range filenames {
-		reader, leadingContent, err := readStream(filename, leadingContentPreProcessing)
+		reader, leadingContent, err := readStream(filename, fileIndex == 0 && leadingContentPreProcessing)
 		if err != nil {
 			return err
 		}