Implement doublestar globbing instead of file list

main.go

@@ -4,9 +4,11 @@ import (
 	"flag"
 	"image/jpeg"
 	"os"
+	"path/filepath"
 	"sync"
 
 	logger "git.site.quack-lab.dev/dave/cylogger"
+	"github.com/bmatcuk/doublestar/v4"
 	"github.com/corona10/goimagehash"
 )
 
@@ -17,7 +19,25 @@ func main() {
 	hashes := &sync.Map{}
 	logger.Info("Starting")
 	logger.Info("Threshold: %v", *thresh)
-	logger.Info("Files: %d", len(flag.Args()))
+	logger.Info("Patterns: %d", len(flag.Args()))
+
+	files := make([]string, 0)
+	for _, pattern := range flag.Args() {
+		base, pattern := doublestar.SplitPattern(pattern)
+		logger.Debug("Globbing %q from %q", pattern, base)
+		matches, err := doublestar.Glob(os.DirFS(base), pattern)
+		if err != nil {
+			logger.Error("Failed to glob pattern: %v", err)
+			continue
+		}
+		logger.Debug("Glob %q in %q got %d matches", pattern, base, len(matches))
+		for _, match := range matches {
+			match = filepath.Join(base, match)
+			logger.Trace("Adding %q", match)
+			files = append(files, match)
+		}
+	}
+	logger.Info("Patterns expanded to %d files", len(files))
 
 	wg := sync.WaitGroup{}
 	for _, file := range flag.Args() {