Back up the daemon and restore its data

[onechat] / terminal.go

diff --git a/terminal.go b/terminal.go
index eff009cd9f7e225f45e96b72f8e72e3f79f20eca..9945620bdb5fd5329ef6e9e1bc32b922f2cef31a 100644 (file)
--- a/terminal.go
+++ b/terminal.go
@@ -10,6 +10,8 @@ import (
        "net"
        "path/filepath"
        "strings"
+
+       "golang.org/x/sys/unix"
 )
 
 // terminalResultLines is the most lines of a tool result that the client shows.
@@ -37,6 +39,7 @@ func terminal(ctx context.Context, in io.Reader, out io.Writer) error {
        }
 
        var dialer net.Dialer
+
        conn, err := dialer.DialContext(ctx, "unix", path)
        if err != nil {
                return fmt.Errorf(`connect to the daemon (start it with "onechat daemon"): %w`, err)
@@ -60,14 +63,17 @@ func terminalSession(ctx context.Context, conn net.Conn, in io.Reader, out io.Wr
        }()
 
        var err error
+
        select {
        case err = <-sent:
                err = errors.Join(err, conn.Close())
+
                <-shown
        case err = <-shown:
                err = errors.Join(terminalCmpError(err, errTerminalDaemonClosed), conn.Close())
        case <-ctx.Done():
                err = conn.Close()
+
                <-shown
        }
 
@@ -83,6 +89,7 @@ func terminalSendLines(ctx context.Context, conn net.Conn, in io.Reader) error {
        encoder := json.NewEncoder(conn)
        scanner := bufio.NewScanner(in)
        scanner.Buffer(make([]byte, 64*1024), socketRequestBytes)
+
        for ctx.Err() == nil && scanner.Scan() {
                line := scanner.Text()
                request := SocketRequest{
@@ -126,12 +133,17 @@ func terminalSendLines(ctx context.Context, conn net.Conn, in io.Reader) error {
 }
 
 // terminalShowEvents writes each event from the daemon to out until the
-// connection closes.
+// connection closes. Only replies and work messages use Markdown styles, and
+// only when out is a terminal. Terminal output ends each shown idle event with
+// an input prompt and clears that prompt before the next shown event.
 func terminalShowEvents(conn net.Conn, out io.Writer) error {
+       busy, prompt := false, false
        scanner := bufio.NewScanner(conn)
        scanner.Buffer(make([]byte, 64*1024), socketRequestBytes)
+
        for scanner.Scan() {
                var event Event
+
                err := json.Unmarshal(scanner.Bytes(), &event)
                if err != nil {
                        return fmt.Errorf("decode event: %w", err)
@@ -142,7 +154,29 @@ func terminalShowEvents(conn net.Conn, out io.Writer) error {
                        continue
                }
 
-               _, err = io.WriteString(out, text+"\n")
+               columns := terminalColumns(out)
+               if columns > 0 && (event.Kind == "reply" || event.Kind == "work") {
+                       text = strings.Join(terminalMarkdown(text, columns), "\n")
+               }
+
+               switch event.Kind {
+               case "busy":
+                       busy = true
+               case "idle":
+                       busy = false
+               }
+
+               text += "\n"
+               if prompt {
+                       text = "\r\x1b[2K" + text
+               }
+
+               prompt = columns > 0 && !busy
+               if prompt {
+                       text += "> "
+               }
+
+               _, err = io.WriteString(out, text)
                if err != nil {
                        return fmt.Errorf("write terminal event: %w", err)
                }
@@ -203,6 +237,26 @@ func terminalEventText(event Event) string {
        }
 }
 
+// terminalColumns returns the current terminal width, or zero for other output.
+// A terminal that reports no columns uses 80.
+func terminalColumns(out io.Writer) int {
+       file, ok := out.(interface{ Fd() uintptr })
+       if !ok {
+               return 0
+       }
+
+       size, err := unix.IoctlGetWinsize(int(file.Fd()), unix.TIOCGWINSZ)
+       if err != nil {
+               return 0
+       }
+
+       if size.Col == 0 {
+               return 80
+       }
+
+       return int(size.Col)
+}
+
 // terminalFirstLines returns the first count lines of text, with the number of
 // the lines left out.
 func terminalFirstLines(text string, count int) string {