Add support for Gorilla generation (deepmap#585)

* Add support for Gorilla generation

As part of deepmap#465, it'd be handy to have gorilla/mux, a commonly used HTTP
server as a generated server.

This is very similar to Chi, as it is also `net/http` compliant, and
allows us to mostly copy-paste the code, with very minor tweaks for
Gorilla-specific routing needs.

* Add example project for Gorilla

As part of deepmap#465, we should produce an example version of the Petstore
API using Gorilla, to validate that this works, as well as showing
sample usage to consumers.

README.md

@@ -255,6 +255,9 @@ func SetupHandler() {
     http.Handle("/", Handler(&myApi))
 }
 ```
+
+Alternatively, [Gorilla](https://github.com/gorilla/mux) is also 100% compatible with `net/http` and can be generated with `-generate gorilla`.
+
 </summary></details>
 
 #### Additional Properties in type definitions

cmd/oapi-codegen/oapi-codegen.go

@@ -86,7 +86,7 @@ func main() {
 	// All flags below are deprecated, and will be removed in a future release. Please do not
 	// update their behavior.
 	flag.StringVar(&flagGenerate, "generate", "types,client,server,spec",
-		`Comma-separated list of code to generate; valid options: "types", "client", "chi-server", "server", "gin", "spec", "skip-fmt", "skip-prune"`)
+		`Comma-separated list of code to generate; valid options: "types", "client", "chi-server", "server", "gin", "gorilla", "spec", "skip-fmt", "skip-prune"`)
 	flag.StringVar(&flagIncludeTags, "include-tags", "", "Only include operations with the given tags. Comma-separated list of tags.")
 	flag.StringVar(&flagExcludeTags, "exclude-tags", "", "Exclude operations that are tagged with the given tags. Comma-separated list of tags.")
 	flag.StringVar(&flagTemplatesDir, "templates", "", "Path to directory containing user templates")
@@ -321,6 +321,8 @@ func newConfigFromOldConfig(c oldConfiguration) configuration {
 			opts.Generate.EchoServer = true
 		case "gin":
 			opts.Generate.GinServer = true
+		case "gorilla":
+			opts.Generate.GorillaServer = true
 		case "types":
 			opts.Generate.Models = true
 		case "spec":

examples/petstore-expanded/gorilla/api/cfg.yaml

@@ -0,0 +1,6 @@
+package: api
+generate:
+  gorilla-server: true
+  models: true
+  embedded-spec: true
+output: petstore.gen.go