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    "info": {
        "author": "Will Larson",
        "author_email": "lethain@gmail.com",
        "bugtrack_url": null,
        "classifiers": [
            "License :: OSI Approved :: MIT License",
            "Operating System :: OS Independent",
            "Programming Language :: Python :: 3"
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        "description": "\n# Systems\n\n`systems` is a set of tools for describing, running and visualizing\n[systems diagrams](https://lethain.com/systems-thinking/).\n\n\nInstallation directions are below, and then get started by [working through the tutorial](./docs/tutorial.md)\nor reading through the [Jupyter notebook example](../notebooks/hiring.ipynb) example.\n\nFor a more in-depth look at the system syntax, please read [the syntax specification](./docs/spec.md).\n\n## Quickest start\n\nFollow the installation instructions below, then write a system definition\nsuch as:\n\n    Start(10)\n    Start  > Middle @ 2\n    Middle > End\n\nYou can then evaluate your system (use `--csv` for an importable format):\n\n    cat tmp.txt | systems-run -r 3\n\n            Start   Middle  End\n    0       10      0       0\n    1       8       2       0\n    2       6       3       1\n    3       4       4       2\n\nSee [the tutorial](./docs/tutorial.md) for more detailed starting information.\n\n## Jupyter notebooks\n\nLikely the easiest way to iterate on a model is within a Jupyter notebook.\nSee an [example notebook here](./notebooks/hiring.ipynb).\n[Read this blog post for more installation details](https://lethain.com/systems-jupyter-notebook/).\n\n## Installation\n\nTo install via PyPi:\n\n    pip install systems\n\nTo install for local development:\n\n    git clone https://github.com/lethain/systems.git\n    cd systems\n    python3 -m venv ./env\n    source ./env/bin/activate\n    python setup.py develop\n\nRun tests via:\n\n    python3 -m unittest tests/test_*.py\n\nOr run a single test via:\n\n    python3 tests/test_parse.py TestParse.test_parse_complex_formula\n\nPlease open an Github issue if you run into any problems!\n\n## Using the command line tools\n\nThere are four command line tools that you'll use when creating and debugging\nsystems/\n\n`systems-run` is used to run models:\n\n    $ cat examples/hiring.txt | systems-run -r 3\n    PhoneScreens    Onsites Offers  Hires   Employees       Departures\n    0       0               0       0       0       5               0\n    1       25              0       0       0       5               0\n    2       25              12      0       0       5               0\n    3       25              12      6       0       5               0\n\n`systems-viz` is used to visualize models into [Graphviz](https://www.graphviz.org/):\n\n    $ cat examples/hiring.txt | systems-viz\n    // Parsed\n    digraph {\n      rankdir=LR\n      0 [label=Candidates]\n      1 [label=PhoneScreens]\n      // etc, etc, some other stuff\n    }\n\nTypically you'll pipe the output of `systems-viz` into `dot`, for example\n\n    $ cat examples/hiring.txt | systems-viz | dot -Tpng -o tmp.png\n\n`systems-format` reads in a model, tokenizes it and formats the tokens\ninto properly formatted results. This is similar to `gofmt`, and could\nbe used for ensuring a consistent house formatting style for your diagrams.\n(It was primarily implemented to support generating human readable error\nmessages instead of surfacing the tokens to humans when errors arise.)\n\n    $ cat examples/hiring.txt | systems-fmt\n    [Candidates] > PhoneScreens @ 25\n    PhoneScreens > Onsites @ 0.5\n    # etc etc\n\n`systems-lex` generates the tokens for a given system file.\nThis is typically most useful when you're extending the lexer\nto support new types of functionality, but can also be useful\nfor other kinds of debugging:\n\n    $ cat examples/hiring.txt | systems-lex\n    ('lines',\n       [('line',\n         1,\n         [('comment', '# wrap with [] to indicate an infinite stock that')]),\n        ('line', 2, [('comment', \"# isn't included in each table\")]),\n\t('line', 3, [('comment', '# integers are implicitly steady rates')]),\n\t('line',\n\t 4,\n         [('infinite_stock', 'Candidates', ('params', [])),\n\t  ('flow_direction', '>'),\n          ('stock', 'PhoneScreens', ('params', ())),\n          ('flow_delimiter', '@'),\n          ('flow', '', ('params', (('formula', [('whole', '25')]),)))]),\n\t...\n      ]\n    )\n\n\n## Error messages\n\nThe parser will do its best to give you a useful error message.\nFor example, if you're missing delimiters:\n\n    cat examples/no_delim.txt | systems-run\n    line 1 is missing delimiter '>': \"[a] < b @ 25\"\n\nAt worst, it will give you the line number and line that is\ncreating an issue:\n\n    cat examples/invalid_flow.txt | systems-run\n    line 1 could not be parsed: \"a > b @ 0..2\"\n\n## Uploading distribution\n\nIf you are trying to install this on PyPi, the steps are roughly:\n\n    python3 -m pip install --user --upgrade pip\n    python3 -m pip install --user --upgrade wheel\n    python3 -m pip install --user --upgrade twine\n    python3 setup.py sdist bdist_wheel\n    twine upload --repository-url https://upload.pypi.org/legacy/ dist/*\n\nThat should more or less work. :)\n\n\n",
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