phase3: HTTP server with converter, one-shot preview store, and middleware

cmd/md-to-html/main.go

@@ -1,12 +1,18 @@
 package main
 
 import (
+	"context"
 	"flag"
 	"fmt"
 	"io"
 	"os"
+	"os/signal"
+	"syscall"
 
+	"github.com/fserg/md-to-html/internal/converter"
+	"github.com/fserg/md-to-html/internal/server"
 	"github.com/fserg/md-to-html/internal/version"
+	webtemplate "github.com/fserg/md-to-html/web/template"
 )
 
 func main() {
@@ -24,7 +30,7 @@ func run(args []string, stdout, stderr io.Writer) int {
 		printUsage(stdout)
 		return 0
 	case "serve":
-		return runServe(args[1:], stdout)
+		return runServe(args[1:], stdout, stderr)
 	case "cli":
 		return runCLI(args[1:], stdout, stderr)
 	case "version":
@@ -36,13 +42,45 @@ func run(args []string, stdout, stderr io.Writer) int {
 	}
 }
 
-func runServe(args []string, stdout io.Writer) int {
+func runServe(args []string, stdout, stderr io.Writer) int {
 	fs := flag.NewFlagSet("serve", flag.ContinueOnError)
 	fs.SetOutput(io.Discard)
 	if err := fs.Parse(args); err != nil {
 		return 2
 	}
-	fmt.Fprintln(stdout, "serve not implemented yet")
+
+	if fs.NArg() != 0 {
+		fmt.Fprintln(stderr, "usage: md-to-html serve")
+		return 2
+	}
+
+	cfg, err := server.LoadConfig()
+	if err != nil {
+		fmt.Fprintf(stderr, "load config: %v\n", err)
+		return 1
+	}
+
+	conv, err := converter.New(webtemplate.FS)
+	if err != nil {
+		fmt.Fprintf(stderr, "load converter: %v\n", err)
+		return 1
+	}
+
+	srv, err := server.New(cfg, conv)
+	if err != nil {
+		fmt.Fprintf(stderr, "create server: %v\n", err)
+		return 1
+	}
+
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer cancel()
+
+	if err := srv.Run(ctx); err != nil {
+		fmt.Fprintf(stderr, "run server: %v\n", err)
+		return 1
+	}
+
+	_ = stdout
 	return 0
 }
 
@@ -85,7 +123,7 @@ func printUsage(w io.Writer) {
   md-to-html version
 
 Commands:
-  serve    Start the HTTP server stub
+  serve    Start the HTTP server
   cli      Convert a Markdown file stub
   version  Print the build version
 `)