Only add submodule if in a git repository

src/Dependencies.cake

@@ -6,22 +6,26 @@
                                     remote-branch-name (* (const char))
                                     &return bool)
   (unless (fileExists output-directory)
-    (comptime-cond
-     ('Dependencies-Clone-Only
-      (Logf "%s: Cloning from %s. Will NOT be tracked as a submodule\n\n"
-            output-directory repository-url)
-      (run-process-sequential-or
-          ("git" "clone" repository-url output-directory)
-        (Logf "error: failed to clone %s\n" output-directory)
-        (return false)))
-     (true
-      (Logf "%s: Automatically adding as submodule from %s\n\n"
-            output-directory repository-url)
-      (run-process-sequential-or
-          ("git" "submodule" "add" repository-url output-directory)
-        (Logf "error: failed to add %s as a git submodule dependency. Are you in a git repository?\n"
-              output-directory)
-        (return false))))
+    (var should-add-submodule bool
+      (comptime-cond ('Dependencies-Clone-Only false)
+                     ;; Don't add submodule if not in a git repository
+                     ('true (fileExists ".git"))))
+    (if should-add-submodule
+        (scope ;; Submodule
+         (Logf "\n%s: Automatically adding as submodule from %s\n"
+               output-directory repository-url)
+         (run-process-sequential-or
+             ("git" "submodule" "add" repository-url output-directory)
+           (Logf "error: failed to add %s as a git submodule dependency. Are you in a git repository?\n"
+                 output-directory)
+           (return false)))
+        (scope ;; Clone only
+         (Logf "%s: Cloning from %s. Will NOT be tracked as a submodule\n\n"
+               output-directory repository-url)
+         (run-process-sequential-or
+             ("git" "clone" repository-url output-directory)
+           (Logf "error: failed to clone %s\n" output-directory)
+           (return false))))
 
     (when remote-branch-name
       (var remote-branch-buffer ([] 256 char) (array 0))