Userland: "touch" can now handle multiple paths as arguments

You can now do:
  touch a.txt b.txt c.txt d.txt

Also now you can't do:
  touch --test  # This created a "./--test" file

Also adds ArgsParser to the mix to better handle arguments :)

Userland/touch.cpp

@@ -24,6 +24,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <LibCore/ArgsParser.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
@@ -55,24 +56,28 @@ int main(int argc, char** argv)
  return 1;
  }
 
- if (argc != 2) {
- fprintf(stderr, "usage: touch <path>\n");
- return 1;
- }
- if (file_exists(argv[1])) {
- int rc = utime(argv[1], nullptr);
- if (rc < 0)
- perror("utime");
- } else {
- int fd = open(argv[1], O_CREAT, 0100644);
- if (fd < 0) {
- perror("open");
- return 1;
- }
- int rc = close(fd);
- if (rc < 0) {
- perror("close");
- return 1;
+ Vector<const char*> paths;
+
+ Core::ArgsParser args_parser;
+ args_parser.add_positional_argument(paths, "Files to touch", "path", Core::ArgsParser::Required::Yes);
+ args_parser.parse(argc, argv);
+
+ for (auto path : paths) {
+ if (file_exists(path)) {
+ int rc = utime(path, nullptr);
+ if (rc < 0)
+ perror("utime");
+ } else {
+ int fd = open(path, O_CREAT, 0100644);
+ if (fd < 0) {
+ perror("open");
+ return 1;
+ }
+ int rc = close(fd);
+ if (rc < 0) {
+ perror("close");
+ return 1;
+ }
  }
  }
  return 0;