Metadata-Version: 2.1
Name: sphinx-ext-substitution
Version: 0.1.2
Summary: Sphinx extension for substituting variables
Home-page: https://github.com/NordicHPC/sphinx_ext_substitution
Author: Richard Darst
License: UNKNOWN
Description: Sphinx extension for power substitutions
        ========================================
        
        `Sphinx <https://www.sphinx-doc.org/>`__ (and `Docutils
        <http://docutils.sourceforge.net/>`__) provide a way to template
        variables into your documentation, but it can be kind of limited.
        This Sphinx extension provides a powerful way to manage a master set
        of documentation with local-specific variations.  **Logical
        management** is a key design consideration: it's easy to make some
        variable substitutions, but harder to keep them up to date when you
        make a long-running fork!
        
        Features include:
        
        - Default values can also be included inline and replaced only if a
          replacement value is defined.
        - Search paths for variable replacements: hierarchical variable
          substitutions, group and then local customizations supported.
        - Multiple compilation mode: original, with substitutions, or both.
          In the "both" mode, both the original and substituted are shown with
          highlighting, so that you can easily compare the current original
          values with your current substitute values.
        - Both role (inline) and directive (paragraph level) support.
        - Theoretical Markdown support via `myst_parser
          <https://github.com/executablebooks/MyST-Parser>`__.
        
        
        Demo
        ----
        
        We have this source where we define several substitutions.  Focus on `A2`:
        
        .. figure:: img/demo-source.png
        
           We see definition of several types of substitutions.  This comes
           from the unit tests.
        
        .. figure:: img/demo-replaced.png
        
           Here we see the default build, with the replaced value included.
           Any missing replacements keep their default value.
        
        .. figure:: img/demo-original.png
        
           We might need to be see the original, embedded values.  This is easy.
        
        .. figure:: img/demo-both.png
        
           Here is the real benefit to sphinx_ext_substitution: compile with
           *both* values included, so that you can quickly scan the text and
           make sure that all substitutions
        
        .. figure:: img/demo-sub-list-directive.png
        
           Here's a second real benefit: listing of all substitution IDs,
           along with original and replacement values.  This makes it easy to
           see what new substitutions have been added and to keep them in sync.
        
        All of the above not just applies to inline paragraph text (roles),
        but to block paragraph-level directives (directives).
        
        Substitutions can be maintained easily within YAML or ``.rst``.
        
        
        
        Usage examples
        --------------
        
        As a role::
        
          SSH to :sub:`(hostname) triton.aalto.fi`
        
        We see the ReST role is named ``sub`` (which conflicts with
        "subscript", maybe we should change that) and an ID of ``hostname``.
        If there is a file called ``hostname.rst`` in the search path or a
        file with a ``.yaml`` extension with a ``hostname`` key in the search
        path, it will substitute that value into this place.  If this value
        doesn't exist, it will use the original (or remove it if the original
        is empty).
        
        As a directive::
        
           .. sub:: ssh_clarification
        
        This directive works analogously to the role, with an ID of
        ``ssh_clarification``.  There is no default content in this example,
        which means that nothing is inserted unless a replacement is defined ,
        so in this case when used without content it can be used to add in an
        extra content in just some versions.  (There could be default content,
        too.)  If the directive had content, then it would work the same as
        the first example.
        
        As a reminder, in Docutils/Sphinx, a role is inline text and a
        directive is a paragraph-level structure.
        
        There are three run modes, controlled by the ``substitution_mode``
        configuration option:
        
        * ``replace``: Use the replacements if defined or else the original,
          with no special markup.  This is the default mode and does what you
          expect for normal use.
        
        * ``both``: Show *both* the ID, original value, and the replacement
          value with distinguishing markup (HTML only).  This can be used to
          compare your local version with the latest upstream. to see what
          needs to be updated - or what substitutions are available and should
          be used.
        
        * ``original``: Show only the original text without any replacements.
        
        Finally, there is a ``sub-list`` directive::
        
          .. sub-list::
        
        This directive is replaced with a table that contains all substitution
        IDs, original values, and replacements that have been used in the
        document.
        
        
        When searching for replacement values:
        
        1. First, each item in the search path (configuration option
           ``substitute_path``) is searched.
        
           a. If it's a file, load it as YAML (see below)
        
           b. If it's a directory, go to step 2.
        
        2. List the directory and search for files to load.
        
           a. First, load all ``*.rst`` files.  The ``*`` value is used as the
              replacement ID.
        
           b. Second, search for all ``*.yaml`` files.  Load them as YAML
              data, which should be a mapping from keys to values.
        
           c. All values are ``.strip()``\ ped.
        
        3. Use the first-detected value for each ID.  Thus, earlier items in
           the search path take precedence over later ones.
        
        
        YAML reminder::
        
          ID1: this is the text for replacement id = ID1
          ID2: |
              This is a block text that preserves newlines.
        
              The "|" character is what indicates that newlines should be
              preserved.
          ID3: >
              Using the ">" character removes all newlines and runs the block
              text together.
        
        
        Installation
        ------------
        Install the extension.  Currently not in any package managers, so::
        
            pip install
        
        Add the extension to your Sphinx ``conf.py`` file::
        
            extensions = [
                'sphinx_ext_substitution'
            ]
        
        There are no non-trivial dependencies besides PyYAML (which is listed
        as a dependency, but if you don't use the YAML feature it isn't
        needed).  Sphinx and Docutils are obviously required - our goal is to
        support any reasonable version.
        
        
        
        Configuration
        -------------
        
        Currently there are two Sphinx variables defined:
        
        * ``substitute_mode``: One of ``replace`` (the default), ``original``,
          or ``both``.  See above for the meaning of these values.
        
        * ``substitute_path`` is a path to search for replacement variables,
          keyed by ID.  In Sphinx, this is a list of paths, but if given on
          command with ``-D substitute_path=dir1:dir2``, you can
          colon-separate paths as well.  Each file on this path that ends in
          ``.rst`` or ``.yaml`` is searched for variables.  The default is
          ``.``.
        
        * The environment variable ``SPHINX_EXT_SUBSTITUTION_PATH`` is used
          *before* the ``substitute_path`` configuration option.  Both are
          used if both are given (the env var takes precedence).  There is no
          need for both, but it provides more flexible configuration for
          integration to your build system.
        
        
        
        Development and maintenance
        ---------------------------
        
        Most functonality exists and this is now usable, but not extensively
        used yet.  Please send any changes or requests to us.  This was
        developed as a first non-trivial Sphinx extension, so any refactorings
        to make things better are welcome.
        
        Primary maintainer: Richard Darst, Aalto University.
        
Keywords: sphinx-extension
Platform: UNKNOWN
Classifier: Programming Language :: Python :: 3
Classifier: Development Status :: 4 - Beta
Classifier: Framework :: Sphinx
Classifier: Framework :: Sphinx :: Extension
Classifier: Operating System :: OS Independent
Requires-Python: >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*,
Description-Content-Type: text/x-rst
