From db0ffdb1fe02528bf2b9ab4985c4e1ad5d762697 Mon Sep 17 00:00:00 2001
From: Martin Durant <martin.durant@alumni.utoronto.ca>
Date: Mon, 30 Mar 2026 14:26:21 -0400
Subject: [PATCH] AI Code: implement create() for conda-project spec

---
 src/projspec/proj/base.py          |  3 +++
 src/projspec/proj/conda_project.py | 18 ++++++++++++++++++
 tests/test_roundtrips.py           |  1 +
 3 files changed, 22 insertions(+)

diff --git a/src/projspec/proj/base.py b/src/projspec/proj/base.py
index 972cb7e..740cb11 100644
--- a/src/projspec/proj/base.py
+++ b/src/projspec/proj/base.py
@@ -77,6 +77,9 @@ def __init__(
         else:
             storage_options = fs.storage_options
         self.storage_options = storage_options or {}
+        assert (
+            fs is not None
+        )  # guaranteed by the if/else above; url_to_fs lacks return annotation
         self.fs = fs
         self.url = path  # this is the FS-specific variant
         self.specs = AttrDict()
diff --git a/src/projspec/proj/conda_project.py b/src/projspec/proj/conda_project.py
index 3d21290..0560e2c 100644
--- a/src/projspec/proj/conda_project.py
+++ b/src/projspec/proj/conda_project.py
@@ -1,3 +1,5 @@
+import os
+
 import yaml
 
 from projspec.proj import ProjectSpec
@@ -13,6 +15,22 @@ class CondaProject(ProjectSpec):
     # not a spec, but a howto:
     spec_doc = "https://conda-incubator.github.io/conda-project/tutorial.html"
 
+    @staticmethod
+    def _create(path: str) -> None:
+        name = os.path.basename(path)
+        env_file = "environment.yml"
+        with open(f"{path}/{env_file}", "wt") as f:
+            f.write("channels:\n  - conda-forge\ndependencies:\n  - python >=3.10\n")
+        with open(f"{path}/conda-project.yml", "wt") as f:
+            f.write(
+                f"name: {name}\n"
+                "environments:\n"
+                f"  default:\n"
+                f"  - {env_file}\n"
+                "variables: {}\n"
+                "commands: {}\n"
+            )
+
     def match(self) -> bool:
         # TODO: a .condarc or environment.yml file is actually enough, e.g.,
         #  https://github.com/conda-incubator/conda-project/tree/main/examples/condarc-settings
diff --git a/tests/test_roundtrips.py b/tests/test_roundtrips.py
index 38cc8e2..d485c49 100644
--- a/tests/test_roundtrips.py
+++ b/tests/test_roundtrips.py
@@ -30,6 +30,7 @@
         "pixi",
         "uv",
         "briefcase",
+        "conda_project",
     ],
 )
 def test_compliant(tmpdir, cls_name):