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main.go
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main.go
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package main
import (
"cmp"
"encoding/json"
"io"
"log"
"os"
"strings"
"github.com/maxmzkr/protoc_merge/merge"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/descriptorpb"
"google.golang.org/protobuf/types/pluginpb"
)
func ptr[T any](v T) *T {
return &v
}
func max[T cmp.Ordered](a, b T) T {
if b > a {
return b
}
return a
}
type mergeSpec struct {
basePaths map[string]bool
prefixes []string
packages []string
}
type matchedFiles struct {
base *descriptorpb.FileDescriptorProto
merge *descriptorpb.FileDescriptorProto
merged *descriptorpb.FileDescriptorProto
}
func main() {
data, err := io.ReadAll(os.Stdin)
if err != nil {
os.Exit(1)
}
req := &pluginpb.CodeGeneratorRequest{}
if err := proto.Unmarshal(data, req); err != nil {
os.Exit(1)
}
prefixes := []string{}
packages := []string{}
paths := map[string]bool{}
for _, param := range strings.Split(req.GetParameter(), ",") {
var value string
if i := strings.Index(param, "="); i >= 0 {
value = param[i+1:]
param = param[0:i]
}
switch param {
case "":
case "prefix":
prefixes = append(prefixes, value)
case "package":
packages = append(packages, value)
case "paths":
paths[value] = true
default:
os.Exit(1)
}
}
if len(prefixes) != 3 {
os.Exit(1)
}
if len(packages) != 2 {
os.Exit(1)
}
resp := &pluginpb.CodeGeneratorResponse{
SupportedFeatures: proto.Uint64(uint64(pluginpb.CodeGeneratorResponse_FEATURE_PROTO3_OPTIONAL)),
}
filesToGenerate := make(map[string]bool)
for _, name := range req.GetFileToGenerate() {
filesToGenerate[name] = true
}
matchedMap := map[string]matchedFiles{}
for _, file := range req.GetProtoFile() {
for i, prefix := range prefixes {
if strings.HasPrefix(file.GetName(), prefix) {
suffix := file.GetName()[len(prefix):]
matchedFile := matchedMap[suffix]
switch i {
case 0:
matchedFile.base = file
case 1:
matchedFile.merge = file
case 2:
matchedFile.merged = file
}
matchedMap[suffix] = matchedFile
}
}
}
for _, matchedFile := range matchedMap {
if matchedFile.base == nil {
continue
}
if matchedFile.merge == nil {
continue
}
mergeSpec := merge.MergeSpec{
MergePackage: packages[0],
MergedPackage: packages[1],
MergePrefix: prefixes[1],
MergedPrefix: prefixes[2],
}
j, err := json.MarshalIndent(req, "", " ")
if err != nil {
os.Exit(1)
}
log.Println(string(j))
baseF := merge.ParseFile(matchedFile.base)
mergeF := merge.ParseFile(matchedFile.merge)
mergedF := merge.ParseFile(matchedFile.merged)
outF := mergeSpec.MergeFile(baseF, mergeF, mergedF)
file := &pluginpb.CodeGeneratorResponse_File{
// We can't use merged file name because it might not exist yet
Name: ptr(strings.Replace(matchedFile.merge.GetName(), prefixes[1], prefixes[2], 1)),
Content: ptr(merge.Serialize(outF)),
}
resp.File = append(resp.File, file)
}
data, err = proto.Marshal(resp)
if err != nil {
os.Exit(1)
}
if _, err := os.Stdout.Write(data); err != nil {
os.Exit(1)
}
}