Rework input args to be glob instead of files

So we don't have to do the whole find | shit

main.go

@@ -12,6 +12,7 @@ import (
 	"strings"
 	"sync"
 
+	"github.com/bmatcuk/doublestar/v4"
 	lua "github.com/yuin/gopher-lua"
 )
 
@@ -71,30 +72,44 @@ func init() {
 func main() {
 	// Define flags
 	flag.Usage = func() {
-		fmt.Fprintf(os.Stderr, "Usage: %s <regex_with_capture_groups> <lua_expression> <...files>\n", os.Args[0])
-		fmt.Fprintf(os.Stderr, "Example: %s \"<value>(\\d+)</value>,(\\d+)\" \"v1 * 1.5 * v2\" data.xml\n", os.Args[0])
-		fmt.Fprintf(os.Stderr, "   or simplified: %s \"<value>(\\d+)</value>,(\\d+)\" \"v1 * 1.5 * v2\" data.xml\n", os.Args[0])
-		fmt.Fprintf(os.Stderr, "   or even simpler: %s \"<value>(\\d+)</value>\" \"*1.5\" data.xml\n", os.Args[0])
-		fmt.Fprintf(os.Stderr, "   or direct assignment: %s \"<value>(\\d+)</value>\" \"=0\" data.xml\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "Usage: %s <regex_with_capture_groups> <lua_expression> <...files_or_globs>\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "\nExamples:\n")
+		fmt.Fprintf(os.Stderr, "  %s \"<value>(\\d+)</value>\" \"*1.5\" data.xml\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "  %s \"<value>(\\d+)</value>\" \"*1.5\" \"*.xml\"\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "  %s \"<value>(\\d+)</value>,(\\d+)\" \"v1 * 1.5 * v2\" data.xml\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "  %s \"<value>(\\d+)</value>\" \"=0\" data.xml\n", os.Args[0])
 		fmt.Fprintf(os.Stderr, "\nNote: v1, v2, etc. are used to refer to capture groups as numbers.\n")
 		fmt.Fprintf(os.Stderr, "      s1, s2, etc. are used to refer to capture groups as strings.\n")
 		fmt.Fprintf(os.Stderr, "      Helper functions: num(str) converts string to number, str(num) converts number to string\n")
 		fmt.Fprintf(os.Stderr, "      is_number(str) checks if a string is numeric\n")
 		fmt.Fprintf(os.Stderr, "      If expression starts with an operator like *, /, +, -, =, etc., v1 is automatically prepended\n")
 		fmt.Fprintf(os.Stderr, "      You can use any valid Lua code, including if statements, loops, etc.\n")
+		fmt.Fprintf(os.Stderr, "      Glob patterns are supported for file selection (*.xml, data/**.xml, etc.)\n")
 	}
 
 	flag.Parse()
 	args := flag.Args()
 	if len(args) < 3 {
-		Error.Println("Insufficient arguments - need regex pattern, lua expression, and at least one file")
+		Error.Println("Insufficient arguments - need regex pattern, lua expression, and at least one file or glob pattern")
 		flag.Usage()
 		return
 	}
 
 	regexPattern := args[0]
 	luaExpr := args[1]
-	files := args[2:]
+	filePatterns := args[2:]
+
+	// Expand file patterns with glob support
+	files, err := expandFilePatterns(filePatterns)
+	if err != nil {
+		Error.Printf("Error expanding file patterns: %v", err)
+		return
+	}
+
+	if len(files) == 0 {
+		Error.Println("No files found matching the specified patterns")
+		return
+	}
 
 	Info.Printf("Starting modifier with pattern '%s', expression '%s' on %d files", regexPattern, luaExpr, len(files))
 
@@ -506,3 +521,22 @@ func min(a, b int) int {
 	}
 	return b
 }
+
+func expandFilePatterns(patterns []string) ([]string, error) {
+	var files []string
+	filesMap := make(map[string]bool)
+
+	for _, pattern := range patterns {
+		matches, _ := doublestar.Glob(os.DirFS("."), pattern)
+		for _, m := range matches {
+			if info, err := os.Stat(m); err == nil && !info.IsDir() && !filesMap[m] {
+				filesMap[m], files = true, append(files, m)
+			}
+		}
+	}
+
+	if len(files) > 0 {
+		Info.Printf("Found %d files to process", len(files))
+	}
+	return files, nil
+}