protogen: use full path for generated file variable name

Use the full path (including the extension) for the generation of
the per-file variable name. Several reasons for this:

* The current logic is buggy in the case where pathType == pathTypeImport
since the prefix variable will be mangled with the Go import path.

* The extension is technically part of the path.
Thus, "path/to/foo.proto" and "path/to/foo.protodevel" are two
distinctly different imports.

* Style-wise, it subjectively looks better. Rather than being a mixture
of camelCase and snake_case, it is all snake_case for the common case:
	before: ProtoFile_google_protobuf_any
	after:  File_google_protobuf_any_proto

* Since the extension is almost always ".proto", this results in a
suffix of "_proto", which provides an additional layer of protection
against possible name conflicts. The previous approach could possibly
have a conflict between "Foo.proto" and a message named ProtoFile
with a sub-message called Foo.

Also, use the per-file variable name for the raw descriptor variables
instead of the hashed version.

Change-Id: Ic91e326b7593e5985cee6ececc60539c27fe32fe
Reviewed-on: https://go-review.googlesource.com/c/164379
Reviewed-by: Damien Neil <dneil@google.com>
diff --git a/internal/testprotos/test/test.pb.go b/internal/testprotos/test/test.pb.go
index 0d35481..37e45e4 100644
--- a/internal/testprotos/test/test.pb.go
+++ b/internal/testprotos/test/test.pb.go
@@ -26,7 +26,7 @@
 )
 
 func (e ForeignEnum) Type() protoreflect.EnumType {
-	return xxx_ProtoFile_test_enumTypes[0]
+	return xxx_File_test_proto_enumTypes[0]
 }
 func (e ForeignEnum) Number() protoreflect.EnumNumber {
 	return protoreflect.EnumNumber(e)
@@ -64,7 +64,7 @@
 }
 
 func (ForeignEnum) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{0}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{0}
 }
 
 type TestReservedEnumFields int32
@@ -74,7 +74,7 @@
 )
 
 func (e TestReservedEnumFields) Type() protoreflect.EnumType {
-	return xxx_ProtoFile_test_enumTypes[1]
+	return xxx_File_test_proto_enumTypes[1]
 }
 func (e TestReservedEnumFields) Number() protoreflect.EnumNumber {
 	return protoreflect.EnumNumber(e)
@@ -108,7 +108,7 @@
 }
 
 func (TestReservedEnumFields) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{1}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{1}
 }
 
 type TestAllTypes_NestedEnum int32
@@ -121,7 +121,7 @@
 )
 
 func (e TestAllTypes_NestedEnum) Type() protoreflect.EnumType {
-	return xxx_ProtoFile_test_enumTypes[2]
+	return xxx_File_test_proto_enumTypes[2]
 }
 func (e TestAllTypes_NestedEnum) Number() protoreflect.EnumNumber {
 	return protoreflect.EnumNumber(e)
@@ -161,7 +161,7 @@
 }
 
 func (TestAllTypes_NestedEnum) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{0, 0}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{0, 0}
 }
 
 type TestDeprecatedMessage_DeprecatedEnum int32 // Deprecated: Do not use.
@@ -170,7 +170,7 @@
 )
 
 func (e TestDeprecatedMessage_DeprecatedEnum) Type() protoreflect.EnumType {
-	return xxx_ProtoFile_test_enumTypes[3]
+	return xxx_File_test_proto_enumTypes[3]
 }
 func (e TestDeprecatedMessage_DeprecatedEnum) Number() protoreflect.EnumNumber {
 	return protoreflect.EnumNumber(e)
@@ -204,7 +204,7 @@
 }
 
 func (TestDeprecatedMessage_DeprecatedEnum) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{1, 0}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{1, 0}
 }
 
 type TestAllTypes struct {
@@ -304,13 +304,13 @@
 }
 
 func (m *TestAllTypes) ProtoReflect() protoreflect.Message {
-	return xxx_ProtoFile_test_messageTypes[0].MessageOf(m)
+	return xxx_File_test_proto_messageTypes[0].MessageOf(m)
 }
 func (m *TestAllTypes) Reset()         { *m = TestAllTypes{} }
 func (m *TestAllTypes) String() string { return proto.CompactTextString(m) }
 func (*TestAllTypes) ProtoMessage()    {}
 func (*TestAllTypes) Descriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{0}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{0}
 }
 
 func (m *TestAllTypes) XXX_Unmarshal(b []byte) error {
@@ -1052,13 +1052,13 @@
 }
 
 func (m *TestDeprecatedMessage) ProtoReflect() protoreflect.Message {
-	return xxx_ProtoFile_test_messageTypes[1].MessageOf(m)
+	return xxx_File_test_proto_messageTypes[1].MessageOf(m)
 }
 func (m *TestDeprecatedMessage) Reset()         { *m = TestDeprecatedMessage{} }
 func (m *TestDeprecatedMessage) String() string { return proto.CompactTextString(m) }
 func (*TestDeprecatedMessage) ProtoMessage()    {}
 func (*TestDeprecatedMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{1}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{1}
 }
 
 func (m *TestDeprecatedMessage) XXX_Unmarshal(b []byte) error {
@@ -1128,13 +1128,13 @@
 }
 
 func (m *ForeignMessage) ProtoReflect() protoreflect.Message {
-	return xxx_ProtoFile_test_messageTypes[2].MessageOf(m)
+	return xxx_File_test_proto_messageTypes[2].MessageOf(m)
 }
 func (m *ForeignMessage) Reset()         { *m = ForeignMessage{} }
 func (m *ForeignMessage) String() string { return proto.CompactTextString(m) }
 func (*ForeignMessage) ProtoMessage()    {}
 func (*ForeignMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{2}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{2}
 }
 
 func (m *ForeignMessage) XXX_Unmarshal(b []byte) error {
@@ -1176,13 +1176,13 @@
 }
 
 func (m *TestReservedFields) ProtoReflect() protoreflect.Message {
-	return xxx_ProtoFile_test_messageTypes[3].MessageOf(m)
+	return xxx_File_test_proto_messageTypes[3].MessageOf(m)
 }
 func (m *TestReservedFields) Reset()         { *m = TestReservedFields{} }
 func (m *TestReservedFields) String() string { return proto.CompactTextString(m) }
 func (*TestReservedFields) ProtoMessage()    {}
 func (*TestReservedFields) Descriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{3}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{3}
 }
 
 func (m *TestReservedFields) XXX_Unmarshal(b []byte) error {
@@ -1211,13 +1211,13 @@
 }
 
 func (m *TestAllExtensions) ProtoReflect() protoreflect.Message {
-	return xxx_ProtoFile_test_messageTypes[4].MessageOf(m)
+	return xxx_File_test_proto_messageTypes[4].MessageOf(m)
 }
 func (m *TestAllExtensions) Reset()         { *m = TestAllExtensions{} }
 func (m *TestAllExtensions) String() string { return proto.CompactTextString(m) }
 func (*TestAllExtensions) ProtoMessage()    {}
 func (*TestAllExtensions) Descriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{4}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{4}
 }
 
 var extRange_TestAllExtensions = []proto.ExtensionRange{
@@ -1254,13 +1254,13 @@
 }
 
 func (m *OptionalGroupExtension) ProtoReflect() protoreflect.Message {
-	return xxx_ProtoFile_test_messageTypes[5].MessageOf(m)
+	return xxx_File_test_proto_messageTypes[5].MessageOf(m)
 }
 func (m *OptionalGroupExtension) Reset()         { *m = OptionalGroupExtension{} }
 func (m *OptionalGroupExtension) String() string { return proto.CompactTextString(m) }
 func (*OptionalGroupExtension) ProtoMessage()    {}
 func (*OptionalGroupExtension) Descriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{5}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{5}
 }
 
 func (m *OptionalGroupExtension) XXX_Unmarshal(b []byte) error {
@@ -1296,13 +1296,13 @@
 }
 
 func (m *RepeatedGroupExtension) ProtoReflect() protoreflect.Message {
-	return xxx_ProtoFile_test_messageTypes[6].MessageOf(m)
+	return xxx_File_test_proto_messageTypes[6].MessageOf(m)
 }
 func (m *RepeatedGroupExtension) Reset()         { *m = RepeatedGroupExtension{} }
 func (m *RepeatedGroupExtension) String() string { return proto.CompactTextString(m) }
 func (*RepeatedGroupExtension) ProtoMessage()    {}
 func (*RepeatedGroupExtension) Descriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{6}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{6}
 }
 
 func (m *RepeatedGroupExtension) XXX_Unmarshal(b []byte) error {
@@ -1337,13 +1337,13 @@
 }
 
 func (m *TestNestedExtension) ProtoReflect() protoreflect.Message {
-	return xxx_ProtoFile_test_messageTypes[7].MessageOf(m)
+	return xxx_File_test_proto_messageTypes[7].MessageOf(m)
 }
 func (m *TestNestedExtension) Reset()         { *m = TestNestedExtension{} }
 func (m *TestNestedExtension) String() string { return proto.CompactTextString(m) }
 func (*TestNestedExtension) ProtoMessage()    {}
 func (*TestNestedExtension) Descriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{7}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{7}
 }
 
 func (m *TestNestedExtension) XXX_Unmarshal(b []byte) error {
@@ -1372,13 +1372,13 @@
 }
 
 func (m *FooRequest) ProtoReflect() protoreflect.Message {
-	return xxx_ProtoFile_test_messageTypes[8].MessageOf(m)
+	return xxx_File_test_proto_messageTypes[8].MessageOf(m)
 }
 func (m *FooRequest) Reset()         { *m = FooRequest{} }
 func (m *FooRequest) String() string { return proto.CompactTextString(m) }
 func (*FooRequest) ProtoMessage()    {}
 func (*FooRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{8}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{8}
 }
 
 func (m *FooRequest) XXX_Unmarshal(b []byte) error {
@@ -1406,13 +1406,13 @@
 }
 
 func (m *FooResponse) ProtoReflect() protoreflect.Message {
-	return xxx_ProtoFile_test_messageTypes[9].MessageOf(m)
+	return xxx_File_test_proto_messageTypes[9].MessageOf(m)
 }
 func (m *FooResponse) Reset()         { *m = FooResponse{} }
 func (m *FooResponse) String() string { return proto.CompactTextString(m) }
 func (*FooResponse) ProtoMessage()    {}
 func (*FooResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{9}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{9}
 }
 
 func (m *FooResponse) XXX_Unmarshal(b []byte) error {
@@ -1442,13 +1442,13 @@
 }
 
 func (m *TestAllTypes_NestedMessage) ProtoReflect() protoreflect.Message {
-	return xxx_ProtoFile_test_messageTypes[10].MessageOf(m)
+	return xxx_File_test_proto_messageTypes[10].MessageOf(m)
 }
 func (m *TestAllTypes_NestedMessage) Reset()         { *m = TestAllTypes_NestedMessage{} }
 func (m *TestAllTypes_NestedMessage) String() string { return proto.CompactTextString(m) }
 func (*TestAllTypes_NestedMessage) ProtoMessage()    {}
 func (*TestAllTypes_NestedMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{0, 0}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{0, 0}
 }
 
 func (m *TestAllTypes_NestedMessage) XXX_Unmarshal(b []byte) error {
@@ -1491,13 +1491,13 @@
 }
 
 func (m *TestAllTypes_OptionalGroup) ProtoReflect() protoreflect.Message {
-	return xxx_ProtoFile_test_messageTypes[11].MessageOf(m)
+	return xxx_File_test_proto_messageTypes[11].MessageOf(m)
 }
 func (m *TestAllTypes_OptionalGroup) Reset()         { *m = TestAllTypes_OptionalGroup{} }
 func (m *TestAllTypes_OptionalGroup) String() string { return proto.CompactTextString(m) }
 func (*TestAllTypes_OptionalGroup) ProtoMessage()    {}
 func (*TestAllTypes_OptionalGroup) Descriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{0, 1}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{0, 1}
 }
 
 func (m *TestAllTypes_OptionalGroup) XXX_Unmarshal(b []byte) error {
@@ -1533,13 +1533,13 @@
 }
 
 func (m *TestAllTypes_RepeatedGroup) ProtoReflect() protoreflect.Message {
-	return xxx_ProtoFile_test_messageTypes[12].MessageOf(m)
+	return xxx_File_test_proto_messageTypes[12].MessageOf(m)
 }
 func (m *TestAllTypes_RepeatedGroup) Reset()         { *m = TestAllTypes_RepeatedGroup{} }
 func (m *TestAllTypes_RepeatedGroup) String() string { return proto.CompactTextString(m) }
 func (*TestAllTypes_RepeatedGroup) ProtoMessage()    {}
 func (*TestAllTypes_RepeatedGroup) Descriptor() ([]byte, []int) {
-	return fileDescriptor_c161fcfdc0c3ff1e_gzipped, []int{0, 2}
+	return xxx_File_test_proto_rawdesc_gzipped, []int{0, 2}
 }
 
 func (m *TestAllTypes_RepeatedGroup) XXX_Unmarshal(b []byte) error {
@@ -1901,7 +1901,7 @@
 }
 
 func init() {
-	proto.RegisterFile("test.proto", fileDescriptor_c161fcfdc0c3ff1e_gzipped)
+	proto.RegisterFile("test.proto", xxx_File_test_proto_rawdesc_gzipped)
 	proto.RegisterEnum("goproto.proto.test.ForeignEnum", ForeignEnum_name, ForeignEnum_value)
 	proto.RegisterEnum("goproto.proto.test.TestReservedEnumFields", TestReservedEnumFields_name, TestReservedEnumFields_value)
 	proto.RegisterEnum("goproto.proto.test.TestAllTypes_NestedEnum", TestAllTypes_NestedEnum_name, TestAllTypes_NestedEnum_value)
@@ -1975,7 +1975,7 @@
 	proto.RegisterExtension(E_TestNestedExtension_NestedStringExtension)
 }
 
-var fileDescriptor_c161fcfdc0c3ff1e = []byte{
+var xxx_File_test_proto_rawdesc = []byte{
 	// 12054 bytes of the wire-encoded FileDescriptorProto
 	0x0a, 0x0a, 0x74, 0x65, 0x73, 0x74, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x12, 0x67, 0x6f,
 	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x74, 0x65, 0x73, 0x74,
@@ -2733,15 +2733,15 @@
 	0x73, 0x74, 0x50, 0x01, 0x58, 0x02,
 }
 
-var fileDescriptor_c161fcfdc0c3ff1e_gzipped = protoapi.CompressGZIP(fileDescriptor_c161fcfdc0c3ff1e)
+var xxx_File_test_proto_rawdesc_gzipped = protoapi.CompressGZIP(xxx_File_test_proto_rawdesc)
 
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
-var ProtoFile_test protoreflect.FileDescriptor
+var File_test_proto protoreflect.FileDescriptor
 
-var xxx_ProtoFile_test_enumTypes [4]protoreflect.EnumType
-var xxx_ProtoFile_test_messageTypes [30]protoimpl.MessageType
-var xxx_ProtoFile_test_goTypes = []interface{}{
+var xxx_File_test_proto_enumTypes [4]protoreflect.EnumType
+var xxx_File_test_proto_messageTypes [30]protoimpl.MessageType
+var xxx_File_test_proto_goTypes = []interface{}{
 	(ForeignEnum)(0),                          // 0: goproto.proto.test.ForeignEnum
 	(TestReservedEnumFields)(0),               // 1: goproto.proto.test.TestReservedEnumFields
 	(TestAllTypes_NestedEnum)(0),              // 2: goproto.proto.test.TestAllTypes.NestedEnum
@@ -2779,7 +2779,7 @@
 	(*ImportMessage)(nil),                     // 34: goproto.proto.test.ImportMessage
 	(ImportEnum)(0),                           // 35: goproto.proto.test.ImportEnum
 }
-var xxx_ProtoFile_test_depIdxs = []int32{
+var xxx_File_test_proto_depIdxs = []int32{
 	8,  // goproto.proto.test.optional_int32_extension:extendee -> goproto.proto.test.TestAllExtensions
 	8,  // goproto.proto.test.optional_int64_extension:extendee -> goproto.proto.test.TestAllExtensions
 	8,  // goproto.proto.test.optional_uint32_extension:extendee -> goproto.proto.test.TestAllExtensions
@@ -2872,18 +2872,18 @@
 func init() {
 	var messageTypes [30]protoreflect.MessageType
 	var extensionTypes [37]protoreflect.ExtensionType
-	ProtoFile_test = protoimpl.FileBuilder{
-		RawDescriptor:        fileDescriptor_c161fcfdc0c3ff1e,
-		GoTypes:              xxx_ProtoFile_test_goTypes,
-		DependencyIndexes:    xxx_ProtoFile_test_depIdxs,
-		EnumOutputTypes:      xxx_ProtoFile_test_enumTypes[:],
+	File_test_proto = protoimpl.FileBuilder{
+		RawDescriptor:        xxx_File_test_proto_rawdesc,
+		GoTypes:              xxx_File_test_proto_goTypes,
+		DependencyIndexes:    xxx_File_test_proto_depIdxs,
+		EnumOutputTypes:      xxx_File_test_proto_enumTypes[:],
 		MessageOutputTypes:   messageTypes[:],
 		ExtensionOutputTypes: extensionTypes[:],
 	}.Init()
-	messageGoTypes := xxx_ProtoFile_test_goTypes[4:][:30]
+	messageGoTypes := xxx_File_test_proto_goTypes[4:][:30]
 	for i, mt := range messageTypes[:] {
-		xxx_ProtoFile_test_messageTypes[i].GoType = reflect.TypeOf(messageGoTypes[i])
-		xxx_ProtoFile_test_messageTypes[i].PBType = mt
+		xxx_File_test_proto_messageTypes[i].GoType = reflect.TypeOf(messageGoTypes[i])
+		xxx_File_test_proto_messageTypes[i].PBType = mt
 	}
 	E_OptionalInt32Extension.Type = extensionTypes[0]
 	E_OptionalInt64Extension.Type = extensionTypes[1]
@@ -2922,6 +2922,6 @@
 	E_RepeatedNestedMessageExtension.Type = extensionTypes[34]
 	E_RepeatedNestedEnumExtension.Type = extensionTypes[35]
 	E_TestNestedExtension_NestedStringExtension.Type = extensionTypes[36]
-	xxx_ProtoFile_test_goTypes = nil
-	xxx_ProtoFile_test_depIdxs = nil
+	xxx_File_test_proto_goTypes = nil
+	xxx_File_test_proto_depIdxs = nil
 }