feat: fix broken pkg name

pkg/codegen/template_helpers.go

@@ -277,6 +277,7 @@ var TemplateFunctions = template.FuncMap{
 	"swaggerUriToGorillaUri":     SwaggerUriToGorillaUri,
 	"lcFirst":                    LowercaseFirstCharacter,
 	"ucFirst":                    UppercaseFirstCharacter,
+	"ucFirstWithPkgName":         UppercaseFirstCharacterWithPkgName,
 	"camelCase":                  ToCamelCase,
 	"genResponsePayload":         genResponsePayload,
 	"genResponseTypeName":        genResponseTypeName,

pkg/codegen/templates/strict/strict-interface.tmpl

@@ -25,7 +25,7 @@
         {{$hasHeaders := ne 0 (len .Headers) -}}
         {{$fixedStatusCode := .HasFixedStatusCode -}}
         {{$isRef := .IsRef -}}
-        {{$ref := .Ref  | ucFirst -}}
+        {{$ref := .Ref  | ucFirstWithPkgName -}}
         {{$headers := .Headers -}}
 
         {{if (and $hasHeaders (not $isRef)) -}}

pkg/codegen/utils.go

@@ -43,6 +43,24 @@ func UppercaseFirstCharacter(str string) string {
 	return string(runes)
 }
 
+// Uppercase the first character in a identifier with pkg name. This assumes UTF-8, so we have
+// to be careful with unicode, don't treat it as a byte array.
+func UppercaseFirstCharacterWithPkgName(str string) string {
+	if str == "" {
+		return ""
+	}
+
+	segs := strings.Split(str, ".")
+	var prefix string
+	if len(segs) == 2 {
+		prefix = segs[0] + "."
+		str = segs[1]
+	}
+	runes := []rune(str)
+	runes[0] = unicode.ToUpper(runes[0])
+	return prefix + string(runes)
+}
+
 // Same as above, except lower case
 func LowercaseFirstCharacter(str string) string {
 	if str == "" {