System/Shell/Commands: Add cd

System/Shell/Commands/cd.HC

@@ -0,0 +1,21 @@
+I64 @shell_cmd_cd(@shell* sh, I64 argc, U8** argv)
+{
+    I64 res = 0;
+    if (argc < 2) {
+        StrPrint(&sh->cwd, &Compositor.session.home);
+        return res;
+    }
+    U8* full_expanded_path = @shell_expand_relative_path(sh, argv[1]);
+    if (!FileSystem.PathExists(full_expanded_path)) {
+        Stdio.WriteLine(sh, "cd: %s: No such file or directory\n", argv[1]);
+        res = 1;
+    } else {
+        U8* new_path = @shell_expand_relative_path_to_root_path(sh, argv[1]);
+        U8* resolved_path = @filesystem_resolve_path(new_path);
+        StrPrint(&sh->cwd, resolved_path);
+        Free(resolved_path);
+        Free(new_path);
+    }
+    Free(full_expanded_path);
+    return res;
+}