chore: add day 9

tools.go

@@ -4,12 +4,13 @@ import (
 	"bufio"
 	"fmt"
 	"os"
+	"path/filepath"
 	"strings"
 )
 
 func Runner[R any, F func(*bufio.Scanner) (R, error)](run F) (R, error) {
 	if len(os.Args) != 2 {
-		Log("Usage:", os.Args[0], "FILE")
+		Log("Usage:", filepath.Base(os.Args[0]), "FILE")
 		os.Exit(22)
 	}
 
@@ -23,6 +24,15 @@ func Runner[R any, F func(*bufio.Scanner) (R, error)](run F) (R, error) {
 	return run(scan)
 }
 
+func MustResult[T any](result T, err error) {
+	if err != nil {
+		fmt.Println("ERR", err)
+		os.Exit(1)
+	}
+
+	Log("result", result)
+}
+
 func Log(v ...any) { fmt.Fprintln(os.Stderr, v...) }
 func Logf(format string, v ...any) {
 	if !strings.HasSuffix(format, "\n") {