rev: Port to LibMain

Author: https://github.com/mhermier
Commit: https://github.com/SerenityOS/serenity/commit/4e02b204efc
Pull-request: https://github.com/SerenityOS/serenity/pull/12088
Reviewed-by: https://github.com/kennethmyhra

Userland/Utilities/CMakeLists.txt

@@ -144,6 +144,7 @@ target_link_libraries(pmemdump LibMain)
 target_link_libraries(pro LibMain LibProtocol)
 target_link_libraries(ps LibMain)
 target_link_libraries(pwd LibMain)
+target_link_libraries(rev LibMain)
 target_link_libraries(run-tests LibRegex)
 target_link_libraries(shot LibGUI)
 target_link_libraries(sql LibLine LibSQL LibIPC)

Userland/Utilities/rev.cpp

@@ -5,23 +5,22 @@
  */
 
 #include <LibCore/ArgsParser.h>
+#include <LibCore/System.h>
+#include <LibMain/Main.h>
 #include <errno.h>
 #include <string.h>
 #include <unistd.h>
 
-int main(int argc, char** argv)
+ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
-    if (pledge("stdio rpath", nullptr) < 0) {
-        perror("pledge");
-        return 1;
-    }
+    TRY(Core::System::pledge("stdio rpath"sv));
 
     Vector<StringView> paths;
     Core::ArgsParser args_parser;
 
     args_parser.set_general_help("Concatente files to stdout with each line in reverse.");
     args_parser.add_positional_argument(paths, "File path", "path", Core::ArgsParser::Required::No);
-    args_parser.parse(argc, argv);
+    args_parser.parse(arguments);
 
     Vector<FILE*> streams;
     auto num_paths = paths.size();
@@ -49,10 +48,7 @@ int main(int argc, char** argv)
         }
     };
 
-    if (pledge("stdio", nullptr) < 0) {
-        perror("pledge");
-        return 1;
-    }
+    TRY(Core::System::pledge("stdio"sv));
 
     for (auto* stream : streams) {
         for (;;) {