cat: Port to LibMain :^)

Userland/Utilities/CMakeLists.txt

@@ -57,6 +57,7 @@ target_link_libraries(asctl LibAudio)
 target_link_libraries(base64 LibMain)
 target_link_libraries(bt LibSymbolication)
 target_link_libraries(blockdev LibMain)
+target_link_libraries(cat LibMain)
 target_link_libraries(checksum LibCrypto)
 target_link_libraries(chres LibGUI)
 target_link_libraries(cksum LibCrypto)

Userland/Utilities/cat.cpp

@@ -6,6 +6,8 @@
 
 #include <AK/Vector.h>
 #include <LibCore/ArgsParser.h>
+#include <LibCore/System.h>
+#include <LibMain/Main.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
@@ -13,19 +15,16 @@
 #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", nullptr));
 
     Vector<String> paths;
 
     Core::ArgsParser args_parser;
     args_parser.set_general_help("Concatenate files or pipes to stdout.");
     args_parser.add_positional_argument(paths, "File path", "path", Core::ArgsParser::Required::No);
-    args_parser.parse(argc, argv);
+    args_parser.parse(arguments);
 
     Vector<int> fds;
     if (!paths.is_empty()) {
@@ -43,10 +42,7 @@ int main(int argc, char** argv)
         fds.append(0);
     }
 
-    if (pledge("stdio", nullptr) < 0) {
-        perror("pledge");
-        return 1;
-    }
+    TRY(Core::System::pledge("stdio", nullptr));
 
     for (auto& fd : fds) {
         for (;;) {