.. _tutorial: =============== Sphinx tutorial =============== In this tutorial you will build a simple documentation project using Sphinx, and view it in your browser as HTML. The project will include narrative, handwritten documentation, as well as autogenerated API documentation. The tutorial is aimed towards Sphinx newcomers willing to learn the fundamentals of how projects are created and structured. You will create a fictional software library to generate random food recipes that will serve as a guide throughout the process, with the objective of properly documenting it. To showcase Sphinx capabilities for code documentation you will use Python, which also supports *automatic* documentation generation. .. note:: Several other languages are natively supported in Sphinx for *manual* code documentation, however they require extensions for *automatic* code documentation, like `Breathe `_. To follow the instructions you will need access to a Linux-like command line and a basic understanding of how it works, as well as a working Python installation for development, since you will use *Python virtual environments* to create the project. Getting started --------------- Setting up your project and development environment ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In a new directory, create a file called ``README.rst`` with the following content. .. code-block:: rst :caption: README.rst Lumache ======= **Lumache** (/lu'make/) is a Python library for cooks and food lovers that creates recipes mixing random ingredients. It is a good moment to create a Python virtual environment and install the required tools. For that, open a command line terminal, ``cd`` into the directory you just created, and run the following commands: .. code-block:: console $ python -m venv .venv $ source .venv/bin/activate (.venv) $ python -m pip install sphinx .. note:: The installation method used above is described in more detail in :ref:`install-pypi`. For the rest of this tutorial, the instructions will assume a Python virtual environment. If you executed these instructions correctly, you should have the Sphinx command line tools available. You can do a basic verification running this command: .. code-block:: console (.venv) $ sphinx-build --version sphinx-build 4.0.2 If you see a similar output, you are on the right path! Creating the documentation layout ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Then from the command line, run the following command: .. code-block:: console (.venv) $ sphinx-quickstart docs This will present to you a series of questions required to create the basic directory and configuration layout for your project inside the ``docs`` folder. To proceed, answer each question as follows: - ``> Separate source and build directories (y/n) [n]``: Write "``y``" (without quotes) and press :kbd:`Enter`. - ``> Project name``: Write "``Lumache``" (without quotes) and press :kbd:`Enter`. - ``> Author name(s)``: Write "``Graziella``" (without quotes) and press :kbd:`Enter`. - ``> Project release []``: Write "``0.1``" (without quotes) and press :kbd:`Enter`. - ``> Project language [en]``: Leave it empty (the default, English) and press :kbd:`Enter`. After the last question, you will see the new ``docs`` directory with the following content. .. code-block:: text docs ├── build ├── make.bat ├── Makefile └── source ├── conf.py ├── index.rst ├── _static └── _templates The purpose of each of these files is: ``build/`` An empty directory (for now) that will hold the rendered documentation. ``make.bat`` and ``Makefile`` Convenience scripts to simplify some common Sphinx operations, such as rendering the content. ``source/conf.py`` A Python script holding the configuration of the Sphinx project. It contains the project name and release you specified to ``sphinx-quickstart``, as well as some extra configuration keys. ``source/index.rst`` The :term:`root document` of the project, which serves as welcome page and contains the root of the "table of contents tree" (or *toctree*). Thanks to this bootstrapping step, you already have everything needed to render the documentation as HTML for the first time. To do that, run this command: .. code-block:: console (.venv) $ sphinx-build -b html docs/source/ docs/build/html And finally, open ``docs/build/html/index.html`` in your browser. You should see something like this: .. figure:: /_static/tutorial/lumache-first-light.png :width: 80% :align: center :alt: Freshly created documentation of Lumache Freshly created documentation of Lumache There we go! You created your first HTML documentation using Sphinx. First steps to document your project using Sphinx ------------------------------------------------- Building your HTML documentation ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The ``index.rst`` file that ``sphinx-quickstart`` created has some content already, and it gets rendered as the front page of your HTML documentation. It is written in reStructuredText, a powerful markup language. Modify the file as follows: .. code-block:: rst :caption: docs/source/index.rst Welcome to Lumache's documentation! =================================== **Lumache** (/lu'make/) is a Python library for cooks and food lovers that creates recipes mixing random ingredients. It pulls data from the `Open Food Facts database `_ and offers a *simple* and *intuitive* API. .. note:: This project is under active development. This showcases several features of the reStructuredText syntax, including: - a **section header** using ``===`` for the underline, - two examples of :ref:`rst-inline-markup`: ``**strong emphasis**`` (typically bold) and ``*emphasis*`` (typically italics), - an **inline external link**, - and a ``note`` **admonition** (one of the available :ref:`directives `) Now to render it with the new content, you can use the ``sphinx-build`` command as before, or leverage the convenience script as follows: .. code-block:: console (.venv) $ cd docs (.venv) $ make html After running this command, you will see that ``index.html`` reflects the new changes! Building your documentation in other formats ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Sphinx supports a variety of formats apart from HTML, including PDF, EPUB, :ref:`and more `. For example, to build your documentation in EPUB format, run this command from the ``docs`` directory: .. code-block:: console (.venv) $ make epub After that, you will see the files corresponding to the e-book under ``docs/build/epub/``. You can either open ``Lumache.epub`` with an EPUB-compatible e-book viewer, like `Calibre `_, or preview ``index.xhtml`` on a web browser. .. note:: To quickly display a complete list of possible output formats, plus some extra useful commands, you can run :code:`make help`. Each output format has some specific configuration options that you can tune, :ref:`including EPUB `. For instance, the default value of :confval:`epub_show_urls` is ``inline``, which means that, by default, URLs are shown right after the corresponding link, in parentheses. You can change that behavior by adding the following code at the end of your ``conf.py``: .. code-block:: python # EPUB options epub_show_urls = 'footnote' With this configuration value, and after running ``make epub`` again, you will notice that URLs appear now as footnotes, which avoids cluttering the text. Sweet! .. note:: Generating a PDF using Sphinx can be done running ``make latexpdf``, provided that the system has a working :math:`\LaTeX` installation, as explained in the documentation of :class:`sphinx.builders.latex.LaTeXBuilder`. Although this is perfectly feasible, such installations are often big, and in general LaTeX requires careful configuration in some cases, so PDF generation is out of scope for this tutorial. More Sphinx customization ------------------------- There are two main ways to customize your documentation beyond what is possible with core Sphinx: extensions and themes. Enabling a built-in extension ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In addition to these configuration values, you can customize Sphinx even more by using :doc:`extensions `. Sphinx ships several :ref:`builtin ones `, and there are many more :ref:`maintained by the community `. For example, to enable the :mod:`sphinx.ext.duration` extension, locate the ``extensions`` list in your ``conf.py`` and add one element as follows: .. code-block:: python :caption: docs/source/conf.py # Add any Sphinx extension module names here, as strings. They can be # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom # ones. extensions = [ 'sphinx.ext.duration', ] After that, every time you generate your documentation, you will see a short durations report at the end of the console output, like this one: .. code-block:: console (.venv) $ make html ... The HTML pages are in build/html. ====================== slowest reading durations ======================= 0.042 temp/source/index Using a third-party HTML theme ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Themes, on the other hand, are a way to customize the appearance of your documentation. Sphinx has several :ref:`builtin themes `, and there are also `third-party ones `_. For example, to use the `Furo `_ third-party theme in your HTML documentation, first you will need to install it with ``pip`` in your Python virtual environment, like this: .. code-block:: console (.venv) $ pip install furo And then, locate the ``html_theme`` variable on your ``conf.py`` and replace its value as follows: .. code-block:: python :caption: docs/source/conf.py # The theme to use for HTML and HTML Help pages. See the documentation for # a list of builtin themes. # html_theme = 'furo' With this change, you will notice that your HTML documentation has now a new appearance: .. figure:: /_static/tutorial/lumache-furo.png :width: 80% :align: center :alt: HTML documentation of Lumache with the Furo theme HTML documentation of Lumache with the Furo theme Narrative documentation in Sphinx --------------------------------- Structuring your documentation across multiple pages ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The file ``index.rst`` created by ``sphinx-quickstart`` is the :term:`root document`, whose main function is to serve as a welcome page and to contain the root of the "table of contents tree" (or *toctree*). Sphinx allows you to assemble a project from different files, which is helpful when the project grows. As an example, create a new file ``docs/source/usage.rst`` (next to ``index.rst``) with these contents: .. code-block:: rst :caption: docs/source/usage.rst Usage ===== Installation ------------ To use Lumache, first install it using pip: .. code-block:: console (.venv) $ pip install lumache This new file contains two :ref:`section ` headers, normal paragraph text, and a :rst:dir:`code-block` directive that renders a block of content as source code, with appropriate syntax highlighting (in this case, generic ``console`` text). The structure of the document is determined by the succession of heading styles, which means that, by using ``---`` for the "Installation" section after ``===`` for the "Usage" section, you have declared "Installation" to be a *subsection* of "Usage". To complete the process, add a ``toctree`` :ref:`directive ` at the end of ``index.rst`` including the document you just created, as follows: .. code-block:: rst :caption: docs/source/index.rst Contents -------- .. toctree:: usage This step inserts that document in the root of the *toctree*, so now it belongs to the structure of your project, which so far looks like this: .. code-block:: text index └── usage If you build the HTML documentation running ``make html``, you will see that the ``toctree`` gets rendered as a list of hyperlinks, and this allows you to navigate to the new page you just created. Neat! .. warning:: Documents outside a *toctree* will result in ``WARNING: document isn't included in any toctree`` messages during the build process, and will be unreachable for users. Adding cross-references ~~~~~~~~~~~~~~~~~~~~~~~ One powerful feature of Sphinx is the ability to seamlessly add :ref:`cross-references ` to specific parts of the documentation: a document, a section, a figure, a code object, etc. This tutorial is full of them! To add a cross-reference, write this sentence right after the introduction paragraph in ``index.rst``: .. code-block:: rst :caption: docs/source/index.rst Check out the :doc:`usage` section for further information. The :rst:role:`doc` role you used automatically references a specific document in the project, in this case the ``usage.rst`` you created earlier. Alternatively, you can also add a cross-reference to an arbitrary part of the project. For that, you need to use the :rst:role:`ref` role, and add an explicit *label* that can act as a target. For example, to reference the "Installation" subsection, add a label right before the heading, as follows: .. code-block:: rst :caption: docs/source/usage.rst :emphasize-lines: 4 Usage ===== .. _installation: Installation ------------ ... And make the sentence you added in ``index.rst`` look like this: .. code-block:: rst :caption: docs/source/index.rst Check out the :doc:`usage` section for further information, including how to :ref:`install ` the project. Notice a trick here: the ``install`` part specifies how the link will look like (we want it to be a specific word, so the sentence makes sense), whereas the ```` part refers to the actual label we want to add a cross-reference to. If you do not include an explicit title, hence using ``:ref:`installation```, the section title will be used (in this case, ``Installation``). Both the ``:doc:`` and the ``:ref:`` roles will be rendered as hyperlinks in the HTML documentation. Where to go from here --------------------- This tutorial covered the very first steps to create a documentation project with Sphinx. To continue learning more about Sphinx, check out the :ref:`rest of the documentation `.