git.giacomolli.uk - onechat/blob - terminal.go

   1 package main
   2
   3 import (
   4         "bufio"
   5         "context"
   6         "encoding/json"
   7         "errors"
   8         "fmt"
   9         "io"
  10         "net"
  11         "path/filepath"
  12         "strings"
  13
  14         "golang.org/x/sys/unix"
  15 )
  16
  17 // terminalResultLines is the most lines of a tool result that the client shows.
  18 const terminalResultLines = 10
  19
  20 // errTerminalDaemonClosed tells that the daemon closed the connection.
  21 var errTerminalDaemonClosed = errors.New("the daemon closed the connection")
  22
  23 // terminal runs "onechat" and "onechat chat": the terminal client of the
  24 // daemon. Each line of input is a user message, the line /stop interrupts the
  25 // running turn, the line /stop NAME stops the subagent NAME, and a line that
  26 // starts with /whatsapp is a WhatsApp command. The client shows the replies,
  27 // the tool calls, and their results as they happen. It ends at the end of the
  28 // input or when the daemon closes the connection.
  29 func terminal(ctx context.Context, in io.Reader, out io.Writer) error {
  30         dir, err := dataDir()
  31         if err != nil {
  32                 return err
  33         }
  34
  35         path := filepath.Join(dir, socketFileName)
  36         err = checkSocketPath(path)
  37         if err != nil {
  38                 return err
  39         }
  40
  41         var dialer net.Dialer
  42
  43         conn, err := dialer.DialContext(ctx, "unix", path)
  44         if err != nil {
  45                 return fmt.Errorf(`connect to the daemon (start it with "onechat daemon"): %w`, err)
  46         }
  47
  48         return terminalSession(ctx, conn, in, out)
  49 }
  50
  51 // terminalSession runs the client on conn until the input ends, the daemon
  52 // closes the connection, or ctx ends, and closes conn. A read of the input that
  53 // waits for a line can stay behind when the daemon closes the connection.
  54 func terminalSession(ctx context.Context, conn net.Conn, in io.Reader, out io.Writer) error {
  55         sent := make(chan error, 1)
  56         go func() {
  57                 sent <- terminalSendLines(ctx, conn, in)
  58         }()
  59
  60         shown := make(chan error, 1)
  61         go func() {
  62                 shown <- terminalShowEvents(conn, out)
  63         }()
  64
  65         var err error
  66
  67         select {
  68         case err = <-sent:
  69                 err = errors.Join(err, conn.Close())
  70
  71                 <-shown
  72         case err = <-shown:
  73                 err = errors.Join(terminalCmpError(err, errTerminalDaemonClosed), conn.Close())
  74         case <-ctx.Done():
  75                 err = conn.Close()
  76
  77                 <-shown
  78         }
  79
  80         if err != nil {
  81                 return fmt.Errorf("run terminal client: %w", err)
  82         }
  83
  84         return nil
  85 }
  86
  87 // terminalSendLines sends each line of in as a request until the input ends.
  88 func terminalSendLines(ctx context.Context, conn net.Conn, in io.Reader) error {
  89         encoder := json.NewEncoder(conn)
  90         scanner := bufio.NewScanner(in)
  91         scanner.Buffer(make([]byte, 64*1024), socketRequestBytes)
  92
  93         for ctx.Err() == nil && scanner.Scan() {
  94                 line := scanner.Text()
  95                 request := SocketRequest{
  96                         Type: "send",
  97                         Text: line,
  98                 }
  99
 100                 name, stop := stopSubagentName(line)
 101                 args, whatsapp := whatsappCommandArgs(line)
 102                 switch {
 103                 case strings.TrimSpace(line) == "":
 104                         continue
 105                 case strings.TrimSpace(line) == stopCommand:
 106                         request = SocketRequest{
 107                                 Type: "interrupt",
 108                         }
 109                 case stop:
 110                         request = SocketRequest{
 111                                 Type: "stop",
 112                                 Text: name,
 113                         }
 114                 case whatsapp:
 115                         request = SocketRequest{
 116                                 Type: "whatsapp",
 117                                 Text: args,
 118                         }
 119                 }
 120
 121                 err := encoder.Encode(request)
 122                 if err != nil {
 123                         return fmt.Errorf("send to the daemon: %w", err)
 124                 }
 125         }
 126
 127         err := scanner.Err()
 128         if err != nil {
 129                 return fmt.Errorf("read terminal input: %w", err)
 130         }
 131
 132         return nil
 133 }
 134
 135 // terminalShowEvents writes each event from the daemon to out until the
 136 // connection closes. Only replies and work messages use Markdown styles, and
 137 // only when out is a terminal. Terminal output ends each shown idle event with
 138 // an input prompt and clears that prompt before the next shown event.
 139 func terminalShowEvents(conn net.Conn, out io.Writer) error {
 140         busy, prompt := false, false
 141         scanner := bufio.NewScanner(conn)
 142         scanner.Buffer(make([]byte, 64*1024), socketRequestBytes)
 143
 144         for scanner.Scan() {
 145                 var event Event
 146
 147                 err := json.Unmarshal(scanner.Bytes(), &event)
 148                 if err != nil {
 149                         return fmt.Errorf("decode event: %w", err)
 150                 }
 151
 152                 text := terminalEventText(event)
 153                 if text == "" {
 154                         continue
 155                 }
 156
 157                 columns := terminalColumns(out)
 158                 if columns > 0 && (event.Kind == "reply" || event.Kind == "work") {
 159                         text = strings.Join(terminalMarkdown(text, columns), "\n")
 160                 }
 161
 162                 switch event.Kind {
 163                 case "busy":
 164                         busy = true
 165                 case "idle":
 166                         busy = false
 167                 }
 168
 169                 text += "\n"
 170                 if prompt {
 171                         text = "\r\x1b[2K" + text
 172                 }
 173
 174                 prompt = columns > 0 && !busy
 175                 if prompt {
 176                         text += "> "
 177                 }
 178
 179                 _, err = io.WriteString(out, text)
 180                 if err != nil {
 181                         return fmt.Errorf("write terminal event: %w", err)
 182                 }
 183         }
 184
 185         err := scanner.Err()
 186         if err != nil {
 187                 return fmt.Errorf("read daemon events: %w", err)
 188         }
 189
 190         return nil
 191 }
 192
 193 // terminalCmpError returns err, or fallback when err is nil.
 194 func terminalCmpError(err, fallback error) error {
 195         if err == nil {
 196                 return fallback
 197         }
 198
 199         return err
 200 }
 201
 202 // terminalEventText returns the text that the client shows for event, or "" for
 203 // none. The client shows a user message only from another source, such as
 204 // telegram, because the user typed the others. A tool result shows its first
 205 // terminalResultLines lines. The report of a subagent shows whole, and it
 206 // starts with the name of the subagent.
 207 func terminalEventText(event Event) string {
 208         switch event.Kind {
 209         case "ready":
 210                 return "[connected to " + event.Text + "]"
 211         case "user":
 212                 if event.Source == terminalSource {
 213                         return ""
 214                 }
 215
 216                 return "[" + event.Source + "] " + event.Text
 217         case "reply":
 218                 return event.Text
 219         case "tool":
 220                 return "[tool] " + event.Text
 221         case "echo":
 222                 return "[result] " + terminalFirstLines(event.Text, terminalResultLines)
 223         case "subagent":
 224                 return "[" + event.Text + "] started"
 225         case "work":
 226                 return event.Text
 227         case "busy":
 228                 return "[working]"
 229         case "idle":
 230                 return "[done]"
 231         case "error":
 232                 return "[error] " + event.Text
 233         case "notice":
 234                 return event.Text
 235         default:
 236                 return ""
 237         }
 238 }
 239
 240 // terminalColumns returns the current terminal width, or zero for other output.
 241 // A terminal that reports no columns uses 80.
 242 func terminalColumns(out io.Writer) int {
 243         file, ok := out.(interface{ Fd() uintptr })
 244         if !ok {
 245                 return 0
 246         }
 247
 248         size, err := unix.IoctlGetWinsize(int(file.Fd()), unix.TIOCGWINSZ)
 249         if err != nil {
 250                 return 0
 251         }
 252
 253         if size.Col == 0 {
 254                 return 80
 255         }
 256
 257         return int(size.Col)
 258 }
 259
 260 // terminalFirstLines returns the first count lines of text, with the number of
 261 // the lines left out.
 262 func terminalFirstLines(text string, count int) string {
 263         text = strings.TrimRight(text, "\n")
 264         lines := strings.Split(text, "\n")
 265         if len(lines) <= count {
 266                 return text
 267         }
 268
 269         return strings.Join(lines[:count], "\n") + fmt.Sprintf("\n[%d more lines]", len(lines)-count)
 270 }