Add statusbar cmd

cmd/statusbar/main.go

@@ -0,0 +1,98 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log/slog"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"syscall"
+	"time"
+
+	"code.chimeric.al/dwrz/statusbar/cmd/statusbar/config"
+	"code.chimeric.al/dwrz/statusbar/internal/statusbar"
+)
+
+var once = flag.Bool("1", false, "print output once")
+
+// TODO: block labels; rendered in case of error.
+func main() {
+	flag.Parse()
+
+	var log = slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{
+		AddSource: true,
+		Level:     slog.LevelDebug,
+	}))
+
+	// Setup the main context.
+	// The context cancels on SIGINT or SIGTERM.
+	ctx, stop := signal.NotifyContext(
+		context.Background(),
+		syscall.SIGINT,
+		syscall.SIGTERM,
+	)
+	defer stop()
+
+	if err := run(ctx, log); err != nil {
+		log.Error("failed", slog.Any("error", err))
+		os.Exit(1)
+	}
+}
+
+func run(ctx context.Context, log *slog.Logger) error {
+	// 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, "statusbar")
+
+	if err := os.MkdirAll(wdir, os.ModeDir|0700); err != nil {
+		return fmt.Errorf("failed to create tmp dir: %w", err)
+	}
+
+	flog, err := os.Create(filepath.Join(wdir, "log"))
+	if err != nil {
+		return fmt.Errorf("failed to create log file: %w", err)
+	}
+	defer flog.Close()
+
+	var barLog = slog.New(slog.NewTextHandler(flog, &slog.HandlerOptions{
+		AddSource: true,
+		Level:     slog.LevelDebug,
+	}))
+
+	// Load the config and create the blocks.
+	cfg, blocks, err := config.Load()
+	if err != nil {
+		return fmt.Errorf("failed to load config: %w", err)
+	}
+	var bar = statusbar.New(statusbar.Parameters{
+		Blocks:    blocks,
+		Log:       barLog,
+		Separator: cfg.Separator,
+	})
+
+	// Initial print.
+	fmt.Println(bar.Render(ctx))
+	if *once {
+		return nil
+	}
+
+	// Main loop.
+	ticker := time.NewTicker(1 * time.Second)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return nil
+		case <-ticker.C:
+			fmt.Println(bar.Render(ctx))
+		}
+	}
+}