docker/swarmkit

package main

import (
    "strings"

    "github.com/gogo/protobuf/gogoproto"
    "github.com/gogo/protobuf/proto"
    "github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
    "github.com/gogo/protobuf/protoc-gen-gogo/generator"
    "github.com/gogo/protobuf/vanity"
)

// CustomNameID preprocess the field, and set the [(gogoproto.customname) = "..."]
// if necessary, in order to avoid setting `gogoproto.customname` manually.
// The automatically assigned name should conform to Golang convention.
func CustomNameID(file *descriptor.FileDescriptorProto) {

    f := func(field *descriptor.FieldDescriptorProto) {
        // Skip if [(gogoproto.customname) = "..."] has already been set.
        if gogoproto.IsCustomName(field) {
            return
        }
        // Skip if embedded
        if gogoproto.IsEmbed(field) {
            return
        }
        if field.OneofIndex != nil {
            return
        }
        fieldName := generator.CamelCase(*field.Name)
        switch {
        case *field.Name == "id":
            // id -> ID
            fieldName = "ID"
        case strings.HasPrefix(*field.Name, "id_"):
            // id_some -> IDSome
            fieldName = "ID" + fieldName[2:]
        case strings.HasSuffix(*field.Name, "_id"):
            // some_id -> SomeID
            fieldName = fieldName[:len(fieldName)-2] + "ID"
        case strings.HasSuffix(*field.Name, "_ids"):
            // some_ids -> SomeIDs
            fieldName = fieldName[:len(fieldName)-3] + "IDs"
        default:
            return
        }
        if field.Options == nil {
            field.Options = &descriptor.FieldOptions{}
        }
        if err := proto.SetExtension(field.Options, gogoproto.E_Customname, &fieldName); err != nil {
            panic(err)
        }
    }

    // Iterate through all fields in file
    vanity.ForEachFieldExcludingExtensions(file.MessageType, f)
}