Help: Add a style guide.

This commit is contained in:
Stephen Kelly 2014-02-03 14:16:08 +01:00 committed by Brad King
parent 91fbff8820
commit 6c02e7f427
1 changed files with 167 additions and 2 deletions

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@ -249,8 +249,7 @@ literal block after ``::``
the following indented block as literal text without interpretation.
The command-line help processor prints the ``::`` literally and
prints the block content with common indentation replaced by one
space. We prefer the ``::`` to appear at the end of a paragraph
line instead of as its own line.
space.
``note`` directive
Call out a side note. The command-line help processor prints the
@ -418,6 +417,172 @@ object names like ``OUTPUT_NAME_<CONFIG>``. The form ``a <b>``,
with a space preceding ``<``, is still interpreted as a link text
with an explicit target.
Style
-----
1)
Command signatures should be marked up as plain literal blocks, not as
cmake ``code-blocks``.
2)
Signatures are separated from preceding content by a horizontal
line. That is, use:
.. code-block:: rst
... preceding paragraph.
---------------------------------------------------------------------
::
add_library(<lib> ...)
This signature is used for ...
3)
Use "``OFF``" and "``ON``" for boolean values which can be modified by
the user, such as :prop_tgt:`POSITION_INDEPENDENT_CODE`. Such properties
may be "enabled" and "disabled". Use "``True``" and "``False``" for
inherent values which can't be modified after being set, such as the
:prop_tgt:`IMPORTED` property of a build target.
4)
Use two spaces for indentation. Use two spaces between sentences in
prose.
5)
Prefer to mark the start of literal blocks with ``::`` at the end of
the preceding paragraph. In cases where the following block gets
a ``code-block`` marker, put a single ``:`` at the end of the preceding
paragraph.
6)
Prefer to restrict the width of lines to 75-80 columns. This is not a
hard restriction, but writing new paragraphs wrapped at 75 columns
allows space for adding minor content without significant re-wrapping of
content.
7)
Mark up self-references with ``inline-literal`` syntax. For example,
within the add_executable command documentation, use
.. code-block:: rst
``add_executable``
not
.. code-block:: rst
:command:`add_executable`
which is used elsewhere.
8)
Mark up all other linkable references as links, including repeats. An
alternative, which is used by wikipedia (`<http://en.wikipedia.org/wiki/WP:REPEATLINK>`_),
is to link to a reference only once per article. That style is not used
in CMake documentation.
9)
Mark up references to keywords in signatures, file names, and other
technical terms with ``inline-literl`` syntax, for example:
.. code-block:: rst
If ``WIN32`` is used with :command:`add_executable`, the
:prop_tgt:`WIN32_EXECUTABLE` target property is enabled. That command
creates the file ``<name>.exe`` on Windows.
10)
If referring to a concept which corresponds to a property, and that
concept is described in a high-level manual, prefer to link to the
manual section instead of the property. For example:
.. code-block:: rst
This command creates an :ref:`Imported Target <Imported Targets>`.
instead of:
.. code-block:: rst
This command creates an :prop_tgt:`IMPORTED` target.
The latter should be used only when referring specifically to the
property.
References to manual sections are not automatically created by creating
a section, but code such as:
.. code-block:: rst
.. _`Imported Targets`:
creates a suitable anchor. Use an anchor name which matches the name
of the corresponding section. Refer to the anchor using a
cross-reference with specified text.
Imported Targets need the ``IMPORTED`` term marked up with care in
particular because the term may refer to a command keyword
(``IMPORTED``), a target property (:prop_tgt:`IMPORTED`), or a
concept (:ref:`Imported Targets`).
11)
Where a property, command or variable is related conceptually to others,
by for example, being related to the buildsystem description, generator
expressions or Qt, each relevant property, command or variable should
link to the primary manual, which provides high-level information. Only
particular information relating to the command should be in the
documentation of the command.
12)
When marking section titles, make the section decoration line as long as
the title text. Use only a line below the title, not above. For
example:
.. code-block:: rst
Title Text
----------
Capitalize the first letter of each non-minor word in the title.
13)
When referring to properties, variables, commands etc, prefer to link
to the target object and follow that with the type of object it is.
For example:
.. code-block:: rst
Set the :prop_tgt:`AUTOMOC` target property to ``ON``.
Instead of
.. code-block:: rst
Set the target property :prop_tgt:`AUTOMOC` to ``ON``.
The ``policy`` directive is an exception, and the type us usually
referred to before the link:
.. code-block:: rst
If policy :prop_tgt:`CMP0022` is set to ``NEW`` the behavior is ...
14)
Signatures of commands should wrap optional parts with square brackets,
and should mark list of optional arguments with an ellipsis (``...``).
Elements of the signature which are specified by the user should be
specified with angle brackets, and may be referred to in prose using
``inline-literal`` syntax.
15)
Use American English spellings in prose.
Modules
=======