Automatically create modules directory

CHANGELOG.md

@@ -29,6 +29,7 @@
 - Replace ModulePatch by ComponentPatch ([#2482](https://github.com/nf-core/tools/pull/2482))
 - Fixed `nf-core modules lint` to work with new module structure for nf-test ([#2494](https://github.com/nf-core/tools/pull/2494))
 - Add option `--migrate-pytest` to create a module with nf-test taking into account an existing module ([#2549](https://github.com/nf-core/tools/pull/2549))
+- When installing modules and subworkflows, automatically create the `./modules` directory if it doesn't exist ([#2563](https://github.com/nf-core/tools/issues/2563))
 - Modules `--migrate-pytest` copies template scripts ([#2568](https://github.com/nf-core/tools/pull/2568))
 
 ### Subworkflows

nf_core/modules/modules_json.py

@@ -10,6 +10,7 @@
 
 import git
 import questionary
+import rich.prompt
 from git.exc import GitCommandError
 
 import nf_core.utils
@@ -68,7 +69,13 @@ def create(self):
         new_modules_json = {"name": pipeline_name.strip("'"), "homePage": pipeline_url.strip("'"), "repos": {}}
 
         if not self.modules_dir.exists():
-            raise UserWarning("Can't find a ./modules directory. Is this a DSL2 pipeline?")
+            if rich.prompt.Confirm.ask(
+                "[bold][blue]?[/] Can't find a ./modules directory. Would you like me to create one?", default=True
+            ):
+                log.info(f"Creating ./modules directory in '{self.dir}'")
+                self.modules_dir.mkdir()
+            else:
+                raise UserWarning("Cannot proceed without a ./modules directory.")
 
         # Get repositories
         repos, _ = self.get_pipeline_module_repositories("modules", self.modules_dir)