Better support for resolving relative path refs

Author: danielgtaylor

CHANGELOG.md

@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+- Better support for resolving relative path references.
 - Be more resilient to parser panics when using `--watch`
 - Update Docker build to use Go 1.12 and Go modules.
 - Enhance example-from-schema generation code. Support enums, string formats,

apisprout.go

@@ -10,6 +10,7 @@ import (
 	"math/rand"
 	"mime"
 	"net/http"
+	"net/url"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -227,8 +228,13 @@ func load(uri string, data []byte) (swagger *openapi3.Swagger, router *openapi3f
 	loader := openapi3.NewSwaggerLoader()
 	loader.IsExternalRefsAllowed = true
 
-	swagger, err := loader.LoadSwaggerFromData(data)
+	var u *url.URL
+	u, err = url.Parse(uri)
+	if err != nil {
+		return
+	}
 
+	swagger, err = loader.LoadSwaggerFromDataWithPath(data, u)
 	if err != nil {
 		return
 	}