Initialize repo

.envrc

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+#!/usr/bin/env bash
+# the shebang is ignored, but nice for editors
+
+if type -P lorri &>/dev/null; then
+  eval "$(lorri direnv)"
+else
+  echo 'while direnv evaluated .envrc, could not find the command "lorri" [https://github.com/nix-community/lorri]'
+  use nix
+fi

.gitignore

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+*.pyc
+__pycache__/*
+.env
+result
+todo.md

default.nix

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+{ pkgs ? import <nixpkgs> {} }:
+pkgs.callPackage ./derivation.nix {}  

derivation.nix

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+{ lib, python313Packages }:
+with python313Packages;
+buildPythonApplication {
+  pname = "cereal";
+  version = "0.0.1";
+  propagatedBuildInputs = [ flask requests waitress];
+  src = ./.;
+  pyproject = true;
+  build-system = [setuptools];
+}

result

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+/nix/store/3sidag2a6iy1mdpn341ksvmzfk1wmlma-cereal-0.0.1

ruff.toml

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+exclude = [
+    ".direnv",
+    ".git",
+    ".git-rewrite",
+    ".ipynb_checkpoints",
+    ".mypy_cache",
+    ".pytest_cache",
+    ".pytype",
+    ".ruff_cache",
+    "__pypackages__",
+    "result"
+]
+
+line-length = 120
+indent-width = 4
+
+target-version = "py313"
+
+[lint]
+# Enable Pyflakes (`F`) and a subset of the pycodestyle (`E`) codes by default.
+# Unlike Flake8, Ruff doesn't enable pycodestyle warnings (`W`) or
+# McCabe complexity (`C901`) by default.
+select = ["E4", "E7", "E9", "F"]
+ignore = []
+
+# Allow fix for all enabled rules (when `--fix`) is provided.
+fixable = ["ALL"]
+unfixable = []
+
+# Allow unused variables when underscore-prefixed.
+dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
+
+[format]
+quote-style = "single"
+indent-style = "space"
+skip-magic-trailing-comma = false
+line-ending = "auto"
+# Enable auto-formatting of code examples in docstrings. Markdown,
+# reStructuredText code/literal blocks and doctests are all supported.
+#
+# This is currently disabled by default, but it is planned for this
+# to be opt-out in the future.
+docstring-code-format = false
+# Set the line length limit used when formatting code snippets in
+# docstrings.
+#
+# This only has an effect when the `docstring-code-format` setting is
+# enabled.
+docstring-code-line-length = "dynamic"

setup.py

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+from setuptools import setup, find_packages
+
+setup(
+    name='cereal',
+    verison='0.0.1',
+    packages=find_packages(),
+    include_package_data=True,
+    scripts=['./src/main.py'],
+)

shell.nix

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+{ pkgs ? import <nixpkgs> {}}:
+let
+  mypy = pkgs.python313.withPackages (ps: with ps; [
+    requests
+    flask
+    waitress
+  ]);
+in
+with pkgs;
+mkShell {
+  buildInputs = [
+    mypy
+    pylint
+    python313Packages.ipython
+    python313Packages.ruff
+    python313Packages.python-lsp-server
+    python313Packages.jedi-language-server
+    ty
+    ffmpeg
+  ];
+}

src/main.py

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+#!/usr/bin/env python
+
+print('hello, world!')