fix: copier delay computation (#587)

* fix: copier delay computation

Signed-off-by: Henry Schreiner <[email protected]>

* fix: use smarter dict wrapper

Signed-off-by: Henry Schreiner <[email protected]>

---------

Signed-off-by: Henry Schreiner <[email protected]>

Author: henryiii

README.md

@@ -68,20 +68,19 @@ projects.
 Install `copier` and `copier-templates-extensions`. Using [uv][], that's:
 
 ```bash
-uv tool install 'copier!=9.7.*' --with copier-templates-extensions
+uv tool install --with copier-templates-extensions copier
 ```
 
-(Copier 9.5.0 [has a bug](https://github.com/copier-org/copier/issues/1977), and
-9.7.0/9.7.1 [also have one](https://github.com/copier-org/copier/issues/2113))
-
 Now, run copier to generate your project:
 
 ```bash
 copier copy gh:scientific-python/cookie <pkg> --trust --vcs-ref=HEAD
 ```
 
 (`<pkg>` is the path to put the new project. `--vcs-ref=HEAD` gets the current
-version instead of the last tag, matching cookiecutter's behavior.)
+version instead of the last tag, matching cookiecutter's behavior. Note you can
+combine these two lines into one with `uvx`, just remember to pass `--with`
+before the program name in that case.)
 
 You will get a nicer CLI experience with answer validation. You will also get a
 `.copier-answers.yml` file, which will allow you to perform updates in the

helpers/extensions.py

@@ -1,19 +1,71 @@
 import datetime
+from collections.abc import Mapping
 
 from copier_templates_extensions import ContextHook
 
 
+class SmartDict(Mapping):
+    def __init_subclass__(cls):
+        cls._computed_keys = {}
+
+    def __init__(self, init):
+        self._init = init
+
+    @classmethod
+    def register(cls, func):
+        cls._computed_keys[func.__name__] = func
+        return func
+
+    def __getitem__(self, item):
+        if item in self._computed_keys:
+            return self._computed_keys[item](self._init)
+
+        return self._init[item]
+
+    def __contains__(self, item):
+        return item in self._init or item in self._computed_keys
+
+    def __iter__(self):
+        yield from self._init
+        yield from self._computed_keys
+
+    def __len__(self):
+        return len(self._computed_keys) + len(self._init)
+
+
+class CookiecutterContext(SmartDict):
+    pass
+
+
+@CookiecutterContext.register
+def __year(_):
+    return str(datetime.datetime.today().year)
+
+
+@CookiecutterContext.register
+def __ci(context):
+    return "github" if "github.com" in context["url"] else "gitlab"
+
+
+@CookiecutterContext.register
+def __project_slug(context):
+    return context["project_name"].lower().replace("-", "_").replace(".", "_")
+
+
+@CookiecutterContext.register
+def __type(context):
+    return (
+        "compiled"
+        if context["backend"] in {"pybind11", "skbuild", "mesonpy", "maturin"}
+        else "pure"
+    )
+
+
+@CookiecutterContext.register
+def __answers(context):
+    return context["_copier_conf"]["answers_file"]
+
+
 class CookiecutterNamespace(ContextHook):
     def hook(self, context):
-        context["__year"] = str(datetime.datetime.today().year)
-        context["__project_slug"] = (
-            context["project_name"].lower().replace("-", "_").replace(".", "_")
-        )
-        context["__type"] = (
-            "compiled"
-            if context["backend"] in ["pybind11", "skbuild", "mesonpy", "maturin"]
-            else "pure"
-        )
-        context["__answers"] = context["_copier_conf"]["answers_file"]
-        context["__ci"] = "github" if "github.com" in context["url"] else "gitlab"
-        return {"cookiecutter": context}
+        return {"cookiecutter": CookiecutterContext(context)}

noxfile.py

@@ -325,9 +325,7 @@ def nox_session(session: nox.Session, backend: str, vcs: bool) -> None:
 
 @nox.session(default=False)
 def compare_copier(session):
-    # Copier 9.5.0 broke `--data`
-    # Copier 9.7.0/9.7.1 broke everything
-    session.install("cookiecutter", "copier!=9.7.*", "copier-templates-extensions")
+    session.install("cookiecutter", "copier", "copier-templates-extensions")
 
     tmp_dir = session.create_tmp()
     session.cd(tmp_dir)