[cmd] Add just-stats command

This command is meant for gathering stats across many script files.
Currently breaks due to an oversight in script parsing (if an inline
argument list goes past EOF, everything breaks).

Makefile

@@ -1,9 +1,12 @@
 .PHONY: all
 
-all: bin/script-decode bin/sbutil
+all: bin/script-decode bin/sbutil bin/just-stats
 
 bin/script-decode: cmd/script-decode.go script/*.go
 	go build -o $@ $<
 
 bin/sbutil: cmd/sbutil.go rom/*.go
 	go build -o $@ $<
+
+bin/just-stats: cmd/just-stats.go script/*.go
+	go build -o $@ $<

cmd/just-stats.go

@@ -0,0 +1,85 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"io/fs"
+
+	"github.com/alexflint/go-arg"
+
+	"git.zorchenhimer.com/Zorchenhimer/go-studybox/script"
+)
+
+type Arguments struct {
+	BaseDir string `arg:"positional,required"`
+	Output  string `arg:"positional,required"`
+}
+
+type Walker struct {
+	Found []string
+}
+
+func (w *Walker) WalkFunc(path string, info fs.DirEntry, err error) error {
+	if info.IsDir() {
+		return nil
+	}
+
+	if strings.HasSuffix(path, "_scriptData.dat") {
+		w.Found = append(w.Found, path)
+	}
+
+	return nil
+}
+
+func run(args *Arguments) error {
+	w := &Walker{Found: []string{}}
+	err := filepath.WalkDir(args.BaseDir, w.WalkFunc)
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("found %d scripts\n", len(w.Found))
+
+	stats := make(script.Stats)
+
+	for _, file := range w.Found {
+		fmt.Println(file)
+		scr, err := script.ParseFile(file, 0x0000)
+		if err != nil {
+			if scr != nil {
+				for _, token := range scr.Tokens {
+					fmt.Println(token.String(scr.Labels))
+				}
+			}
+			return err
+		}
+
+		stats.Add(scr.Stats())
+	}
+
+	outfile, err := os.Create(args.Output)
+	if err != nil {
+		return err
+	}
+	defer outfile.Close()
+
+	_, err = stats.WriteTo(outfile)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func main() {
+	args := &Arguments{}
+	arg.MustParse(args)
+
+	err := run(args)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}