clerk/internal/lsp/lsp.go (view raw)
| 1 | package lsp |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "io" |
| 6 | "log/slog" |
| 7 | "os" |
| 8 | "path/filepath" |
| 9 | |
| 10 | "go.lsp.dev/jsonrpc2" |
| 11 | "go.lsp.dev/protocol" |
| 12 | "go.lsp.dev/uri" |
| 13 | |
| 14 | "olexsmir.xyz/clerk/internal/settings" |
| 15 | "olexsmir.xyz/clerk/internal/xdg" |
| 16 | "olexsmir.xyz/clerk/journal" |
| 17 | ) |
| 18 | |
| 19 | type Server struct{ server *server } |
| 20 | |
| 21 | func NewServer(version string, configPath string) (Server, error) { |
| 22 | logger := slog.New(slog.NewTextHandler(os.Stderr, nil)) |
| 23 | if logFile, err := openLogFile(); err == nil { |
| 24 | logger = slog.New(slog.NewTextHandler(logFile, nil)) |
| 25 | } |
| 26 | |
| 27 | srv := &server{ |
| 28 | name: "clerk", |
| 29 | version: version, |
| 30 | |
| 31 | openDocs: make(map[uri.URI]docState), |
| 32 | |
| 33 | settings: settings.DefaultConfig, |
| 34 | configPath: configPath, |
| 35 | loader: journal.NewLoader(), |
| 36 | |
| 37 | log: logger, |
| 38 | } |
| 39 | srv.loader.ContentProvider = srv.bufferContent |
| 40 | return Server{srv}, nil |
| 41 | } |
| 42 | |
| 43 | func (s *Server) Run(ctx context.Context, stdin io.ReadCloser, stdout io.WriteCloser) error { |
| 44 | stream := jsonrpc2.NewStream(readWriterCloser{ |
| 45 | Reader: stdin, |
| 46 | Writer: stdout, |
| 47 | Closer: stdin, |
| 48 | }) |
| 49 | conn := jsonrpc2.NewConn(stream, jsonrpc2.WithCodec(lspCodec{})) |
| 50 | s.server.client = protocol.ClientDispatcher(conn) |
| 51 | s.server.conn = conn |
| 52 | conn.Go(ctx, protocol.Handlers(s.server.lifecycle(protocol.ServerHandler(s.server, jsonrpc2.MethodNotFoundHandler)))) |
| 53 | |
| 54 | <-conn.Done() |
| 55 | s.server.stateMu.Lock() |
| 56 | st := s.server.state |
| 57 | s.server.stateMu.Unlock() |
| 58 | if st >= stateExited { |
| 59 | return &ExitError{Code: st.ExitCode()} |
| 60 | } |
| 61 | return conn.Err() |
| 62 | } |
| 63 | |
| 64 | // bufferContent returns the open buffer text for a path, if any. |
| 65 | // called by the loader during include resolution; must NOT hold the loader lock. |
| 66 | func (s *server) bufferContent(path string) ([]byte, bool) { |
| 67 | s.mu.RLock() |
| 68 | defer s.mu.RUnlock() |
| 69 | st, ok := s.openDocs[uri.File(path)] |
| 70 | return []byte(st.text), ok |
| 71 | } |
| 72 | |
| 73 | type readWriterCloser struct { |
| 74 | io.Reader |
| 75 | io.Writer |
| 76 | io.Closer |
| 77 | } |
| 78 | |
| 79 | func openLogFile() (*os.File, error) { |
| 80 | dir, err := xdg.StateDir() |
| 81 | if err != nil { |
| 82 | return nil, err |
| 83 | } |
| 84 | dir = filepath.Join(dir, "clerk") |
| 85 | if err := os.MkdirAll(dir, 0o700); err != nil { |
| 86 | return nil, err |
| 87 | } |
| 88 | return os.OpenFile(filepath.Join(dir, "lsp.log"), os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0o644) |
| 89 | } |
| 90 | |
| 91 | // lspCodec mirrors go.lsp.dev/protocol wire codec, so Run can install the lifecycle guard. |
| 92 | type lspCodec struct{} |
| 93 | |
| 94 | func (lspCodec) Marshal(v any) ([]byte, error) { |
| 95 | switch m := v.(type) { |
| 96 | case jsonrpc2.RawMessage: |
| 97 | if m == nil { |
| 98 | return []byte("null"), nil |
| 99 | } |
| 100 | return m, nil |
| 101 | case *jsonrpc2.RawMessage: |
| 102 | if m == nil || *m == nil { |
| 103 | return []byte("null"), nil |
| 104 | } |
| 105 | return *m, nil |
| 106 | } |
| 107 | return protocol.Marshal(v) |
| 108 | } |
| 109 | |
| 110 | func (lspCodec) Unmarshal(data []byte, v any) error { |
| 111 | if p, ok := v.(*jsonrpc2.RawMessage); ok { |
| 112 | b := make(jsonrpc2.RawMessage, len(data)) |
| 113 | copy(b, data) |
| 114 | *p = b |
| 115 | return nil |
| 116 | } |
| 117 | return protocol.Unmarshal(data, v) |
| 118 | } |