Add Marimo project support with detection and parsing capabilities

docs/source/api.rst

@@ -60,6 +60,7 @@ User Classes
     proj.uv.Uv
     proj.uv.UvScript
     proj.webapp.Django
+    proj.webapp.Marimo
     proj.webapp.Streamlit
 
 
@@ -95,6 +96,7 @@ User Classes
 .. autoclass:: projspec.proj.uv.Uv
 .. autoclass:: projspec.proj.uv.UvScript
 .. autoclass:: projspec.proj.webapp.Django
+.. autoclass:: projspec.proj.webapp.Marimo
 .. autoclass:: projspec.proj.webapp.Streamlit
 
 

src/projspec/proj/__init__.py

@@ -13,7 +13,7 @@
 from projspec.proj.python_code import PythonCode, PythonLibrary
 from projspec.proj.rust import Rust, RustPython
 from projspec.proj.uv import Uv
-from projspec.proj.webapp import Django, Streamlit
+from projspec.proj.webapp import Django, Marimo, Streamlit
 
 __all__ = [
     "ParseFailed",
@@ -25,6 +25,7 @@
     "GitRepo",
     "JetbrainsIDE",
     "JLabExtension",
+    "Marimo",
     "MDBook",
     "NvidiaAIWorkbench",
     "Node",

src/projspec/proj/webapp.py

@@ -135,6 +135,62 @@ def parse(self) -> None:
                     )
 
 
+class Marimo(ProjectSpec):
+    """Reactive Python notebook and webapp served in the browser"""
+
+    spec_doc = "https://docs.marimo.io/"
+
+    def match(self) -> bool:
+        pyfiles = {
+            data for fn, data in self.proj.scanned_files.items() if fn.endswith(".py")
+        }
+        if not pyfiles:
+            return False
+        # quick check for marimo import in any .py file
+        return any(
+            b"import marimo" in data or b"from marimo " in data for data in pyfiles
+        )
+
+    def parse(self) -> None:
+        from projspec.artifact.process import Server
+
+        self.artifacts["server"] = {}
+        for path, content in self.proj.scanned_files.items():
+            if not path.endswith(".py"):
+                continue
+            content = content.decode()
+            has_import = "import marimo" in content or "from marimo" in content
+            has_app = "marimo.App(" in content or "= App(" in content
+            if has_import and has_app:
+                name = path.rsplit("/", 1)[-1].replace(".py", "")
+                self.artifacts["server"][name] = Server(
+                    proj=self.proj,
+                    cmd=["marimo", "run", path],
+                )
+
+        if not self.artifacts["server"]:
+            raise ParseFailed("No marimo notebooks found")
+
+    @staticmethod
+    def _create(path):
+        with open(f"{path}/marimo-app.py", "wt") as f:
+            f.write(
+                """
+            import marimo
+            __generated_with = "0.19.11"
+            app = marimo.App()
+
+            @app.cell
+            def _():
+                import marimo as mo
+                return "Hello, marimo!"
+
+            if __name__ == "__main__":
+                app.run()
+            """
+            )
+
+
 # TODO: the following are similar to streamlit, but with perhaps even less metadata
 # - flask (from flask import Flask; app = Flask( )
 # - fastapi (from fastapi import FastAPI; app = FastAPI( )

tests/test_marimo.py

@@ -0,0 +1,132 @@
+import os
+import tempfile
+
+import projspec
+from projspec.proj.webapp import Marimo
+
+
+# Sample marimo notebook content
+MARIMO_NOTEBOOK = b"""import marimo
+
+__generated_with = "0.18.4"
+app = marimo.App()
+
+
+@app.cell
+def _():
+    import pandas as pd
+    return (pd,)
+
+
+@app.cell
+def _(pd):
+    df = pd.DataFrame({"a": [1, 2, 3]})
+    df
+    return (df,)
+
+
+if __name__ == "__main__":
+    app.run()
+"""
+
+MARIMO_NOTEBOOK_ALT = b"""from marimo import App
+
+app = App()
+
+
+@app.cell
+def _():
+    print("Hello, marimo!")
+    return
+
+
+if __name__ == "__main__":
+    app.run()
+"""
+
+NOT_MARIMO = b"""import pandas as pd
+
+def main():
+    df = pd.DataFrame({"a": [1, 2, 3]})
+    print(df)
+
+if __name__ == "__main__":
+    main()
+"""
+
+
+def test_marimo_single_notebook():
+    """Test detection of a single marimo notebook"""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        # Create a marimo notebook
+        notebook_path = os.path.join(tmpdir, "notebook.py")
+        with open(notebook_path, "wb") as f:
+            f.write(MARIMO_NOTEBOOK)
+
+        proj = projspec.Project(tmpdir)
+        assert "marimo" in proj.specs
+        spec = proj.specs["marimo"]
+
+        # Should have server artifact
+        assert "server" in spec.artifacts
+        assert "notebook" in spec.artifacts["server"]
+
+        # Check the command
+        assert spec.artifacts["server"]["notebook"].cmd == [
+            "marimo",
+            "run",
+            "notebook.py",
+        ]
+
+
+def test_marimo_multiple_notebooks():
+    """Test detection of multiple marimo notebooks"""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        # Create multiple marimo notebooks
+        for name, content in [
+            ("app1.py", MARIMO_NOTEBOOK),
+            ("app2.py", MARIMO_NOTEBOOK_ALT),
+        ]:
+            path = os.path.join(tmpdir, name)
+            with open(path, "wb") as f:
+                f.write(content)
+
+        proj = projspec.Project(tmpdir)
+        assert "marimo" in proj.specs
+        spec = proj.specs["marimo"]
+
+        # Should have nested artifacts for each notebook
+        assert isinstance(spec.artifacts["server"], dict)
+        assert "app1" in spec.artifacts["server"]
+        assert "app2" in spec.artifacts["server"]
+
+
+def test_marimo_not_detected_for_regular_python():
+    """Test that regular Python files are not detected as marimo"""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        # Create a regular Python file
+        path = os.path.join(tmpdir, "script.py")
+        with open(path, "wb") as f:
+            f.write(NOT_MARIMO)
+
+        proj = projspec.Project(tmpdir)
+        assert "marimo" not in proj.specs
+
+
+def test_marimo_match_requires_both_import_and_app():
+    """Test that both import and App() are required for detection"""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        # Create a file with just the import but no App
+        path = os.path.join(tmpdir, "partial.py")
+        with open(path, "wb") as f:
+            f.write(b"import marimo\n\nprint('hello')\n")
+
+        proj = projspec.Project(tmpdir)
+        # match() returns True (has import), but parse() should fail
+        # because there's no App pattern
+        assert "marimo" not in proj.specs
+
+
+def test_marimo_spec_doc():
+    """Test that spec_doc is set correctly"""
+    assert Marimo.spec_doc == "https://docs.marimo.io/"

tests/test_roundtrips.py

@@ -15,6 +15,7 @@
         "IntakeCatalog",
         "DataPackage",
         "PyScript",
+        "marimo",
     ],
 )
 def test_compliant(tmpdir, cls_name):