fix: print the warning message to stderr instead of stdout (#1895)

ignassew · Jamie Tanna · web-flow · commit e6bcad1155e7 · 2025-04-21T15:16:40.000Z
Co-authored-by: Jamie Tanna &lt;jamie.tanna@elastic.co&gt;
diff --git a/cmd/oapi-codegen/oapi-codegen.go b/cmd/oapi-codegen/oapi-codegen.go
@@ -297,7 +297,7 @@ func main() {
 	}
 
 	if strings.HasPrefix(swagger.OpenAPI, "3.1.") {
-		fmt.Println("WARNING: You are using an OpenAPI 3.1.x specification, which is not yet supported by oapi-codegen (https://github.com/oapi-codegen/oapi-codegen/issues/373) and so some functionality may not be available. Until oapi-codegen supports OpenAPI 3.1, it is recommended to downgrade your spec to 3.0.x")
+		fmt.Fprintln(os.Stderr, "WARNING: You are using an OpenAPI 3.1.x specification, which is not yet supported by oapi-codegen (https://github.com/oapi-codegen/oapi-codegen/issues/373) and so some functionality may not be available. Until oapi-codegen supports OpenAPI 3.1, it is recommended to downgrade your spec to 3.0.x")
 	}
 
 	if len(noVCSVersionOverride) > 0 {

Original file line number	Diff line number	Diff line change
`@@ -297,7 +297,7 @@ func main() {`
`297`	`297`	`}`
`298`	`298`
`299`	`299`	`if strings.HasPrefix(swagger.OpenAPI, "3.1.") {`
`300`		`- fmt.Println("WARNING: You are using an OpenAPI 3.1.x specification, which is not yet supported by oapi-codegen (https://github.com/oapi-codegen/oapi-codegen/issues/373) and so some functionality may not be available. Until oapi-codegen supports OpenAPI 3.1, it is recommended to downgrade your spec to 3.0.x")`
	`300`	`+ fmt.Fprintln(os.Stderr, "WARNING: You are using an OpenAPI 3.1.x specification, which is not yet supported by oapi-codegen (https://github.com/oapi-codegen/oapi-codegen/issues/373) and so some functionality may not be available. Until oapi-codegen supports OpenAPI 3.1, it is recommended to downgrade your spec to 3.0.x")`
`301`	`301`	`}`
`302`	`302`
`303`	`303`	`if len(noVCSVersionOverride) > 0 {`