From e27d84627882fdea2932e1153baa348f82fff907 Mon Sep 17 00:00:00 2001
From: Frank Farzan <frankf@google.com>
Date: Tue, 9 Jun 2020 16:32:29 -0700
Subject: [PATCH] Add a comment header to generated files (#158)

---
 go/cmd/typegen/typegen.go            |  2 +-
 go/pkg/swagger/language/languages.go |  3 +++
 go/pkg/swagger/language/ts.go        | 10 ++++++++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/go/cmd/typegen/typegen.go b/go/cmd/typegen/typegen.go
index a733c4066..aa34d43c4 100644
--- a/go/cmd/typegen/typegen.go
+++ b/go/cmd/typegen/typegen.go
@@ -80,7 +80,7 @@ func printTS(outPath string, refObjects map[swagger.Ref]swagger.Object, definiti
 		RefObjects: refObjects,
 	}
 	for pkg, defs := range pkgs {
-		var contents []string
+		var contents = []string{lang.PrintHeaderComment()}
 		header := lang.PrintHeader(defs)
 		if header != "" {
 			contents = append(contents, header)
diff --git a/go/pkg/swagger/language/languages.go b/go/pkg/swagger/language/languages.go
index 593613383..b8717301b 100644
--- a/go/pkg/swagger/language/languages.go
+++ b/go/pkg/swagger/language/languages.go
@@ -26,6 +26,9 @@ type Language interface {
 	// File returns the relative path to definition's client code.
 	File(definition swagger.Definition) string
 
+	// PrintHeaderComment prints the top-level comment block.
+	PrintHeaderComment() string
+
 	// PrintHeader prints everything appearing before any Definitions, such as import statements.
 	//
 	// definitions is the set of Definitions to be printed in the current file.
diff --git a/go/pkg/swagger/language/ts.go b/go/pkg/swagger/language/ts.go
index d57b12256..19090adad 100644
--- a/go/pkg/swagger/language/ts.go
+++ b/go/pkg/swagger/language/ts.go
@@ -77,6 +77,16 @@ func (ts TypeScript) PrintHeader(definitions []swagger.Definition) string {
 	return strings.Join(result, "\n")
 }
 
+// PrintHeaderComment implements Language.
+func (ts TypeScript) PrintHeaderComment() string {
+	return `
+/**
+ * CODE GENERATED BY 'typgen' BINARY.
+ *
+ * DO NOT EDIT.
+ */`
+}
+
 // Indent adds two spaces to the beginning of every line in the string.
 func Indent(s string) string {
 	splits := strings.Split(s, "\n")