A SimpleX Chat bot that answers arithmetic (closes #1)

Remove the template's HTTP service, database and fx wiring. Add exact
arithmetic on go/parser and go/constant, a client that runs simplex-chat
as a child process and drives its WebSocket API, and the bot, which keeps
an auto-accepting address and replies to each message. The image adds the
checksum-pinned simplex-chat v7.0.2 on Ubuntu 22.04.

Model: opus-5-5

internal/logger/logger.go

@@ -8,43 +8,15 @@ import (
 	"fmt"
 	"io"
 	"log/slog"
-	"os"
 	"path/filepath"
-
-	"go.uber.org/fx"
-	"sneak.berlin/go/simplexcalc/internal/globals"
 )
 
-// Params defines dependencies for Logger.
-type Params struct {
-	fx.In
-
-	Globals *globals.Globals
-
-	// Output is the log destination. Optional in the fx graph: when
-	// absent (production) it defaults to os.Stdout; tests inject a
-	// buffer here to assert on the output contract.
-	Output io.Writer `optional:"true"`
-}
-
-// Logger wraps slog with application-specific functionality.
-type Logger struct {
-	log     *slog.Logger
-	level   *slog.LevelVar
-	globals *globals.Globals
-}
-
-// New creates a new Logger instance.
-func New(_ fx.Lifecycle, params Params) (*Logger, error) {
-	l := &Logger{
-		level:   new(slog.LevelVar),
-		globals: params.Globals,
-	}
-	l.level.Set(slog.LevelInfo)
-
-	out := params.Output
-	if out == nil {
-		out = os.Stdout
+// New returns a JSON logger writing to out, at debug level when debug is
+// set and at info level otherwise.
+func New(out io.Writer, debug bool) *slog.Logger {
+	level := slog.LevelInfo
+	if debug {
+		level = slog.LevelDebug
 	}
 
 	// replaceAttr simplifies the source attribute to "file.go:line".
@@ -60,33 +32,9 @@ func New(_ fx.Lifecycle, params Params) (*Logger, error) {
 		return a
 	}
 
-	handler := slog.NewJSONHandler(out, &slog.HandlerOptions{
-		Level:       l.level,
+	return slog.New(slog.NewJSONHandler(out, &slog.HandlerOptions{
+		Level:       level,
 		AddSource:   true,
 		ReplaceAttr: replaceAttr,
-	})
-
-	l.log = slog.New(handler)
-
-	return l, nil
-}
-
-// EnableDebugLogging sets the log level to debug.
-func (l *Logger) EnableDebugLogging() {
-	l.level.Set(slog.LevelDebug)
-	l.log.Debug("debug logging enabled", "debug", true)
-}
-
-// Get returns the underlying slog.Logger.
-func (l *Logger) Get() *slog.Logger {
-	return l.log
-}
-
-// Identify logs application startup information.
-func (l *Logger) Identify() {
-	l.log.Info("starting",
-		"appname", l.globals.Appname,
-		"version", l.globals.Version,
-		"arch", l.globals.Buildarch,
-	)
+	}))
 }