feat: add rattler-build-conda-compat

.gitattributes

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+# GitHub syntax highlighting
+pixi.lock linguist-language=YAML
+

.github/workflows/build.yml

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+# name: Run updater that will check for conda-forge packages
+
+on: push
+
+jobs:
+  run_tests:
+    runs-on: ubuntu-latest
+
+    steps:
+        - uses: actions/checkout@v4
+
+        - uses: prefix-dev/[email protected]
+          with:
+            pixi-version: "latest"
+
+        - name: pixi install
+          run: | 
+           pixi install
+
+        - name: run tests
+          run: | 
+           pixi run -e test pytest
+

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
+mapping/*# pixi environments
+.pixi
+# pixi environments
+.pixi
+

.vscode/settings.json

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+{
+    "python.analysis.typeCheckingMode": "basic"
+}

enviroment.yaml

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+name: rattler-build-conda-compat
+channels:
+  - conda-forge
+  - nodefaults
+dependencies:
+  - python>=3.8
+  # Development dependencies
+  - pip
+  - python-build
+  - setuptools>=45
+  - rattler-build
+  - conda-build
+  - pytest
+  - syrupy
+  - ruff

pixi.toml

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+[project]
+name = "rattler-build-conda-compat"
+version = "0.1.0"
+description = "Add a short description here"
+authors = ["nichmor <[email protected]>"]
+channels = ["conda-forge"]
+platforms = ["win-64", "linux-64", "osx-64", "osx-arm64"]
+
+[tasks]
+
+[dependencies]
+python = ">=3.8"
+rattler-build = "*"
+conda-build = "*"
+
+[pypi-dependencies]
+rattler_build = { path = ".", editable = true}
+
+
+[feature.test.dependencies]
+pytest = "*"
+syrupy = "*"
+ruff = "*"
+
+
+[environments]
+test = ["test"]

pyproject.toml

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+[build-system]
+requires = [
+    "setuptools>=45",
+]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "rattler-build-conda-compat"
+description="A package for exposing rattler-build API for conda-smithy"
+readme = "README.md"
+authors = [{name = "Nichita Morcotilo", email = "[email protected]"}]
+license = {file = "LICENSE"}
+version = "0.0.1"
+
+requires-python = ">=3.8"

src/rattler_build_conda_compat/loader.py

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+from contextlib import contextmanager
+import yaml
+from typing import Any
+
+
+class RecipeLoader(yaml.BaseLoader):
+    @classmethod
+    @contextmanager
+    def with_namespace(cls, namespace):
+        try:
+            cls._namespace = namespace
+            yield
+        finally:
+            del cls._namespace
+
+    def construct_sequence(self, node: Any, deep: bool = False) -> Any:
+        """deep is True when creating an object/mapping recursively,
+        in that case want the underlying elements available during construction
+        """
+        # find if then else selectors
+        for sequence_idx, child_node in enumerate(node.value[:]):
+            # if then is only present in MappingNode
+
+            if isinstance(child_node, yaml.MappingNode):
+                # iterate to find if there is IF first
+
+                the_evaluated_one = None
+                for idx, (key_node, value_node) in enumerate(child_node.value):
+                    if key_node.value == "if":
+                        # we catch the first one, let's try to find next pair of (then | else)
+                        then_node_key, then_node_value = child_node.value[idx + 1]
+
+                        if then_node_key.value != "then":
+                            raise ValueError(
+                                "cannot have if without then, please reformat your variant file"
+                            )
+
+                        try:
+                            _, else_node_value = child_node.value[idx + 2]
+                        except IndexError:
+                            _, else_node_value = None, None
+
+                        to_be_eval = f"{value_node.value}"
+
+                        evaled = eval(to_be_eval, self._namespace)
+                        if evaled:
+                            the_evaluated_one = then_node_value
+                        elif else_node_value:
+                            the_evaluated_one = else_node_value
+
+                        if the_evaluated_one:
+                            node.value.remove(child_node)
+                            node.value.insert(sequence_idx, the_evaluated_one)
+                        else:
+                            # neither the evaluation or else node is present, so we remove this if
+                            node.value.remove(child_node)
+
+        if not isinstance(node, yaml.SequenceNode):
+            raise Exception(
+                None,
+                None,
+                f"expected a sequence node, but found {node.id!s}",
+                node.start_mark,
+            )
+
+        return [self.construct_object(child, deep=deep) for child in node.value]
+
+
+def remove_empty_keys(variant_dict):
+    filtered_dict = {}
+    for key, value in variant_dict.items():
+        if isinstance(value, list) and len(value) == 0:
+            continue
+        filtered_dict[key] = value
+
+    return filtered_dict
+
+
+def parse_recipe_config_file(path, namespace):
+    with open(path) as f:
+        with RecipeLoader.with_namespace(namespace):
+            content = yaml.load(f, Loader=RecipeLoader)
+    return remove_empty_keys(content)