Rework input args to be glob instead of files

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

glob_test.go

@@ -0,0 +1,89 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestGlobExpansion(t *testing.T) {
+	// Create a temporary directory structure for testing
+	tmpDir, err := os.MkdirTemp("", "glob-test")
+	if err != nil {
+		t.Fatalf("Failed to create temp dir: %v", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	// Create some test files
+	testFiles := []string{
+		filepath.Join(tmpDir, "file1.xml"),
+		filepath.Join(tmpDir, "file2.xml"),
+		filepath.Join(tmpDir, "test.txt"),
+		filepath.Join(tmpDir, "subdir", "file3.xml"),
+		filepath.Join(tmpDir, "subdir", "file4.txt"),
+		filepath.Join(tmpDir, "subdir", "nested", "file5.xml"),
+	}
+
+	// Create the directory structure
+	err = os.MkdirAll(filepath.Join(tmpDir, "subdir", "nested"), 0755)
+	if err != nil {
+		t.Fatalf("Failed to create subdirectories: %v", err)
+	}
+
+	// Create the files
+	for _, file := range testFiles {
+		dir := filepath.Dir(file)
+		if err := os.MkdirAll(dir, 0755); err != nil {
+			t.Fatalf("Failed to create directory %s: %v", dir, err)
+		}
+		if err := os.WriteFile(file, []byte("test content"), 0644); err != nil {
+			t.Fatalf("Failed to create file %s: %v", file, err)
+		}
+	}
+
+	// Change to the temporary directory to use relative paths
+	origDir, _ := os.Getwd()
+	os.Chdir(tmpDir)
+	defer os.Chdir(origDir)
+
+	// Test cases
+	tests := []struct {
+		name     string
+		patterns []string
+		expected int
+	}{
+		{
+			name:     "Simple pattern",
+			patterns: []string{"*.xml"},
+			expected: 2, // file1.xml, file2.xml
+		},
+		{
+			name:     "Multiple patterns",
+			patterns: []string{"*.xml", "*.txt"},
+			expected: 3, // file1.xml, file2.xml, test.txt
+		},
+		{
+			name:     "Directory globbing",
+			patterns: []string{"subdir/*.xml"},
+			expected: 1, // subdir/file3.xml
+		},
+		{
+			name:     "Doublestar pattern",
+			patterns: []string{"**/*.xml"},
+			expected: 4, // All XML files in all directories
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			files, err := expandFilePatterns(tc.patterns)
+			if err != nil {
+				t.Fatalf("expandFilePatterns failed: %v", err)
+			}
+
+			if len(files) != tc.expected {
+				t.Errorf("Expected %d files, got %d: %v", tc.expected, len(files), files)
+			}
+		})
+	}
+}