From c7ef94603155dee1f1a73c20f2350a989b726bd9 Mon Sep 17 00:00:00 2001
From: Mike Farah <mikefarah@gmail.com>
Date: Tue, 14 Nov 2023 13:00:30 +1100
Subject: [PATCH] Fixed multi doc anchor bug #1861

---
 pkg/yqlib/decoder_yaml.go | 6 +++++-
 pkg/yqlib/yaml_test.go    | 7 +++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/pkg/yqlib/decoder_yaml.go b/pkg/yqlib/decoder_yaml.go
index 57eb3eee..f6a6f3d9 100644
--- a/pkg/yqlib/decoder_yaml.go
+++ b/pkg/yqlib/decoder_yaml.go
@@ -20,6 +20,9 @@ type yamlDecoder struct {
 	leadingContent string
 	bufferRead     bytes.Buffer
 
+	// anchor map persists over multiple documents for convenience.
+	anchorMap map[string]*CandidateNode
+
 	readAnything  bool
 	firstFile     bool
 	documentIndex uint
@@ -95,6 +98,7 @@ func (dec *yamlDecoder) Init(reader io.Reader) error {
 	dec.decoder = *yaml.NewDecoder(readerToUse)
 	dec.firstFile = false
 	dec.documentIndex = 0
+	dec.anchorMap = make(map[string]*CandidateNode)
 	return nil
 }
 
@@ -121,7 +125,7 @@ func (dec *yamlDecoder) Decode() (*CandidateNode, error) {
 
 	candidateNode := CandidateNode{document: dec.documentIndex}
 	// don't bother with the DocumentNode
-	err = candidateNode.UnmarshalYAML(yamlNode.Content[0], make(map[string]*CandidateNode))
+	err = candidateNode.UnmarshalYAML(yamlNode.Content[0], dec.anchorMap)
 	if err != nil {
 		return nil, err
 	}
diff --git a/pkg/yqlib/yaml_test.go b/pkg/yqlib/yaml_test.go
index 0d75433f..6306dc77 100644
--- a/pkg/yqlib/yaml_test.go
+++ b/pkg/yqlib/yaml_test.go
@@ -32,6 +32,13 @@ var yamlFormatScenarios = []formatScenario{
 		input:       "[null]",
 		expected:    "[null]\n",
 	},
+	{
+		description: "multi document anchor map",
+		skipDoc:     true,
+		input:       "a: &remember mike\n---\nb: *remember",
+		expression:  "explode(.)",
+		expected:    "a: mike\n---\nb: mike\n",
+	},
 	{
 		description: "basic - [~]",
 		skipDoc:     true,