Improve error handling across the board

main.go

@@ -97,7 +97,7 @@ func main() {
 	originalLuaExpr := luaExpr
 	luaExpr = processor.BuildLuaScript(luaExpr)
 	if originalLuaExpr != luaExpr {
-		logger.Printf("Transformed Lua expression from '%s' to '%s'", originalLuaExpr, luaExpr)
+		logger.Printf("Transformed Lua expression from %q to %q", originalLuaExpr, luaExpr)
 	}
 
 	// Expand file patterns with glob support
@@ -117,17 +117,17 @@ func main() {
 	switch *fileModeFlag {
 	case "regex":
 		proc = &processor.RegexProcessor{}
-		logger.Printf("Starting regex modifier with pattern '%s', expression '%s' on %d files",
+		logger.Printf("Starting regex modifier with pattern %q, expression %q on %d files",
 			pattern, luaExpr, len(files))
 		// case "xml":
 		// 	proc = &processor.XMLProcessor{}
 		// 	pattern = *xpathFlag
-		// 	logger.Printf("Starting XML modifier with XPath '%s', expression '%s' on %d files",
+		// 	logger.Printf("Starting XML modifier with XPath %q, expression %q on %d files",
 		// 		pattern, luaExpr, len(files))
 		// case "json":
 		// 	proc = &processor.JSONProcessor{}
 		// 	pattern = *jsonpathFlag
-		// 	logger.Printf("Starting JSON modifier with JSONPath '%s', expression '%s' on %d files",
+		// 	logger.Printf("Starting JSON modifier with JSONPath %q, expression %q on %d files",
 		// 		pattern, luaExpr, len(files))
 	}