Fixes #188 for check

dfetch/commands/check.py

@@ -48,14 +48,26 @@ def create_menu(subparsers: "argparse._SubParsersAction") -> None:
             action="store_true",
             help="Don't recursively check for child manifests.",
         )
+        parser.add_argument(
+            "projects",
+            metavar="<project>",
+            type=str,
+            nargs="*",
+            help="Specific project(s) to check",
+        )
 
     def __call__(self, args: argparse.Namespace) -> None:
         """Perform the check."""
         manifest, path = dfetch.manifest.manifest.get_manifest()
 
         with in_directory(os.path.dirname(path)):
             exceptions: List[str] = []
-            for project in manifest.projects:
+            projects = manifest.selected_projects(args.projects)
+            if not projects:
+                raise RuntimeError(
+                    f"No (such) projects found! {', '.join(args.projects)}"
+                )
+            for project in projects:
                 with catch_runtime_exceptions(exceptions) as exceptions:
                     dfetch.project.make(project).check_for_update()
 

dfetch/manifest/manifest.py

@@ -172,6 +172,16 @@ def projects(self) -> Sequence[ProjectEntry]:
         """Get a list of Projects from the manifest."""
         return list(self._projects.values())
 
+    def selected_projects(self, names: Sequence[str]) -> Sequence[ProjectEntry]:
+        """Get a list of Projects from the manifest with the given names."""
+        return (
+            list(
+                project for project in self._projects.values() if project.name in names
+            )
+            if names
+            else list(self._projects.values())
+        )
+
     @property
     def remotes(self) -> Sequence[Remote]:
         """Get a list of Remotes from the manifest."""

features/check-specific-projects.feature

@@ -0,0 +1,32 @@
+Feature: Checking specific projects
+
+    *DFetch* can check specific projects, this is usefull when you have a lot
+    of projects in your manifest.
+
+    Scenario: Single project is checked
+        Given the manifest 'dfetch.yaml'
+            """
+            manifest:
+              version: '0.0'
+
+              remotes:
+                - name: github-com-dfetch-org
+                  url-base: https://github.com/dfetch-org/test-repo
+
+              projects:
+                - name: ext/test-repo-rev-only
+                  revision: e1fda19a57b873eb8e6ae37780594cbb77b70f1a
+                  dst: ext/test-repo-rev-only
+
+                - name: ext/test-rev-and-branch
+                  revision: 8df389d0524863b85f484f15a91c5f2c40aefda1
+                  branch: main
+                  dst: ext/test-rev-and-branch
+
+            """
+        When I run "dfetch check ext/test-rev-and-branch"
+        Then the output shows
+            """
+            Dfetch (0.2.0)
+              ext/test-rev-and-branch: wanted (main - 8df389d0524863b85f484f15a91c5f2c40aefda1), available (main - e1fda19a57b873eb8e6ae37780594cbb77b70f1a)
+            """