Add filename option for generated name

Author: technicallyjosh

go.sum

@@ -10,7 +10,6 @@ github.com/go-openapi/swag v0.22.3/go.mod h1:UzaqsxGiab7freDnrUUra0MwWfN/q7tE4j+
 github.com/go-openapi/swag v0.22.4 h1:QLMzNJnMGPRNDCbySlcj1x01tzU8/9LTTL9hZZZogBU=
 github.com/go-openapi/swag v0.22.4/go.mod h1:UzaqsxGiab7freDnrUUra0MwWfN/q7tE4j+VcZ0yl14=
 github.com/go-test/deep v1.0.8 h1:TDsG77qcSprGbC6vTN8OuXp5g+J+b5Pcguhf7Zt61VM=
-github.com/go-test/deep v1.0.8/go.mod h1:5C2ZWiW0ErCdrYzpqxLbTX7MG14M9iiw8DgHncVwcsE=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
 github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
@@ -46,7 +45,6 @@ github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/ugorji/go/codec v1.2.7 h1:YPXUKf7fYbp/y8xloBqZOw2qaVggbfwMlI8WM3wZUJ0=
-github.com/ugorji/go/codec v1.2.7/go.mod h1:WGN1fab3R1fzQlVQTkfxVtIBhWDRqOviHU95kRgeqEY=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=

internal/generator/generator.go

@@ -20,6 +20,7 @@ type Config struct {
 	ContentType     *string
 	DefaultResponse *string
 	Description     *string
+	Filename        *string
 	Host            *string
 	Ignore          *string
 	JSONOutput      *bool
@@ -54,7 +55,7 @@ func (g *Generator) Run() error {
 		return err
 	}
 
-	filename := "openapi.yaml"
+	filename := *g.config.Filename + ".yaml"
 
 	fileBuffer := bytes.Buffer{}
 	jsonBytes, err := doc.MarshalJSON()
@@ -63,7 +64,7 @@ func (g *Generator) Run() error {
 	}
 
 	if useJSON {
-		filename = "openapi.json"
+		filename = *g.config.Filename + ".json"
 		fileBuffer.Write(jsonBytes)
 	} else {
 		// Extra hops to get JSON to YAML.

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"flag"
+
 	"github.com/technicallyjosh/protoc-gen-openapi/internal/generator"
 	"google.golang.org/protobuf/compiler/protogen"
 )
@@ -13,6 +14,7 @@ func main() {
 		ContentType:     flags.String("content_type", "application/json", "Default content-type for all paths."),
 		DefaultResponse: flags.String("default_response", "", "Default response message to use for API responses not defined."),
 		Description:     flags.String("description", "", "Description of the API."),
+		Filename:        flags.String("filename", "openapi", "Name of the file generated without the extension."),
 		Host:            flags.String("host", "", "Host to be used for all routes."),
 		Ignore:          flags.String("ignore", "", "Packages to ignore."),
 		JSONOutput:      flags.Bool("json_out", false, "Generate a JSON file instead of YAML."),