mkdir: Use os::FileSystem and add -p flag

apps/mkdir.cpp

@@ -1,23 +1,49 @@
+#include <luna/NumberParsing.h>
+#include <luna/PathParser.h>
 #include <os/ArgumentParser.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/stat.h>
+#include <os/FileSystem.h>
 
-int main(int argc, char** argv)
+Result<void> mkdir_recursively(StringView path, mode_t mode)
+{
+begin:
+    auto rc = os::FileSystem::create_directory(path, mode);
+    if (!rc.has_error()) return {};
+
+    if (rc.error() == EEXIST) return {};
+    if (rc.error() == ENOENT)
+    {
+        PathParser parser = TRY(PathParser::create(path.chars()));
+        auto parent = TRY(parser.dirname());
+
+        TRY(mkdir_recursively(parent.view(), mode));
+
+        goto begin;
+    }
+
+    return rc.release_error();
+}
+
+Result<int> luna_main(int argc, char** argv)
 {
     StringView path;
     StringView mode_string;
+    bool recursive;
 
     os::ArgumentParser parser;
     parser.add_positional_argument(path, "path"_sv, true);
     parser.add_positional_argument(mode_string, "mode"_sv, "755"_sv);
+    parser.add_switch_argument(recursive, 'p', "parents"_sv);
     parser.parse(argc, argv);
 
-    mode_t mode = (mode_t)strtoul(mode_string.chars(), NULL, 8);
+    mode_t mode = (mode_t)parse_unsigned_integer(mode_string.chars(), nullptr, 8);
 
-    if (mkdir(path.chars(), mode) < 0)
+    if (recursive)
     {
-        perror("mkdir");
-        return 1;
+        TRY(mkdir_recursively(path, mode));
+        return 0;
     }
+
+    TRY(os::FileSystem::create_directory(path, mode));
+
+    return 0;
 }