Add life cmd

2026-10-23 01:23:33 +00:00
parent d1b67e36f7
commit e4ac0b29bd
1 changed files with 120 additions and 0 deletions
@@ -0,0 +1,120 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log/slog"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"syscall"
+	"time"
+
+	"code.chimeric.al/dwrz/life/pkg/life"
+	"code.chimeric.al/dwrz/life/pkg/terminal"
+)
+
+var (
+	height = flag.Int("h", 0, "height")
+	width  = flag.Int("w", 0, "width")
+	tick   = flag.Int("t", 100, "ms between turns")
+)
+
+func main() {
+	var log = slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{
+		AddSource: true,
+		Level:     slog.LevelDebug,
+	}))
+
+	if err := run(log); err != nil {
+		log.Error("failed", slog.Any("error", err))
+		os.Exit(1)
+	}
+}
+
+func run(log *slog.Logger) error {
+	// Parse flags.
+	flag.Parse()
+	if *height < 0 {
+		return fmt.Errorf("invalid height: %d", *height)
+	}
+	if *width < 0 {
+		return fmt.Errorf("invalid width: %d", *width)
+	}
+	if *tick <= 0 {
+		return fmt.Errorf("invalid tick: %d", *tick)
+	}
+
+	// Setup the main context.
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	// Setup workspace and log file.
+	cdir, err := os.UserCacheDir()
+	if err != nil {
+		return fmt.Errorf(
+			"failed to determine user cache directory: %w", err,
+		)
+	}
+	wdir := filepath.Join(cdir, "life")
+
+	if err := os.MkdirAll(wdir, os.ModeDir|0700); err != nil {
+		return fmt.Errorf("failed to create tmp dir: %w", err)
+	}
+
+	f, err := os.Create(wdir + "/log")
+	if err != nil {
+		return fmt.Errorf("failed to create log file: %w", err)
+	}
+	defer f.Close()
+
+	var gameLog = slog.New(slog.NewTextHandler(f, &slog.HandlerOptions{
+		AddSource: true,
+		Level:     slog.LevelDebug,
+	}))
+
+	// Retrieve terminal info.
+	t, err := terminal.New(os.Stdin.Fd())
+	if err != nil {
+		return fmt.Errorf("failed to get terminal attributes: %w", err)
+	}
+	size, err := t.Size()
+	if err != nil {
+		return fmt.Errorf("failed to get terminal size: %w", err)
+	}
+	if *height == 0 {
+		rows := int(size.Rows)
+		height = &rows
+	}
+	if *width == 0 {
+		cols := int(size.Columns)
+		width = &cols
+	}
+
+	// TODO: refactor; handle sigwinch.
+	go func() {
+		var signals = make(chan os.Signal, 1)
+		signal.Notify(signals, syscall.SIGTERM, syscall.SIGINT)
+
+		// Block until we receive a signal.
+		s := <-signals
+		log.Debug("received signal", slog.Any("signal", s))
+
+		cancel()
+	}()
+
+	// Setup the game.
+	var game = life.New(life.Parameters{
+		Height:   *height,
+		In:       os.Stdin,
+		Log:      gameLog,
+		Out:      os.Stdout,
+		Terminal: t,
+		Tick:     time.Duration(*tick) * time.Millisecond,
+		Width:    *width,
+	})
+
+	// Run the game.
+	return game.Run(ctx)
+}