Disable proto rule generation by default in vendor

internal/config/directives.go

@@ -17,6 +17,7 @@ package config
 
 import (
 	"log"
+	"path"
 	"regexp"
 	"strings"
 
@@ -129,7 +130,7 @@ func ApplyDirectives(c *Config, directives []Directive, rel string) *Config {
 // legacy go_proto_library.bzl is loaded, or if this is the Well Known Types
 // repository, legacy mode is used. If go_proto_library is loaded from another
 // file, proto rule generation is disabled.
-func InferProtoMode(c *Config, f *bf.File, directives []Directive) *Config {
+func InferProtoMode(c *Config, rel string, f *bf.File, directives []Directive) *Config {
 	if c.ProtoMode != DefaultProtoMode {
 		return c
 	}
@@ -148,6 +149,11 @@ func InferProtoMode(c *Config, f *bf.File, directives []Directive) *Config {
 		modified.ProtoMode = LegacyProtoMode
 		return &modified
 	}
+	if path.Base(rel) == "vendor" {
+		modified := *c
+		modified.ProtoMode = DisableProtoMode
+		return &modified
+	}
 	if f == nil {
 		return c
 	}

internal/config/directives_test.go

@@ -104,6 +104,7 @@ func TestInferProtoMode(t *testing.T) {
 	for _, tc := range []struct {
 		desc, content string
 		c             Config
+		rel           string
 		want          ProtoMode
 	}{
 		{
@@ -119,6 +120,10 @@ func TestInferProtoMode(t *testing.T) {
 load("@io_bazel_rules_go//proto:go_proto_library.bzl", "go_proto_library")
 `,
 			want: DefaultProtoMode,
+		}, {
+			desc: "vendor",
+			rel:  "vendor",
+			want: DisableProtoMode,
 		}, {
 			desc:    "legacy",
 			content: `load("@io_bazel_rules_go//proto:go_proto_library.bzl", "go_proto_library")`,
@@ -154,7 +159,7 @@ load("@io_bazel_rules_go//proto:go_proto_library.bzl", "go_proto_library")
 				directives = ParseDirectives(f)
 			}
 
-			got := InferProtoMode(&tc.c, f, directives)
+			got := InferProtoMode(&tc.c, tc.rel, f, directives)
 			if got.ProtoMode != tc.want {
 				t.Errorf("got proto mode %v ; want %v", got.ProtoMode, tc.want)
 			}

internal/packages/walk.go

@@ -138,7 +138,7 @@ func Walk(c *config.Config, root string, f WalkFunc) {
 			directives = config.ParseDirectives(oldFile)
 			c = config.ApplyDirectives(c, directives, rel)
 		}
-		c = config.InferProtoMode(c, oldFile, directives)
+		c = config.InferProtoMode(c, rel, oldFile, directives)
 
 		var ignore bool
 		for _, d := range directives {