diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/conf.py | 3 | ||||
| -rw-r--r-- | Documentation/sphinx/automarkup.py | 93 |
2 files changed, 95 insertions, 1 deletions
diff --git a/Documentation/conf.py b/Documentation/conf.py index 7ace3f8852bd..a502baecbb85 100644 --- a/Documentation/conf.py +++ b/Documentation/conf.py @@ -34,7 +34,8 @@ needs_sphinx = '1.3' # Add any Sphinx extension module names here, as strings. They can be # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom # ones. -extensions = ['kerneldoc', 'rstFlatTable', 'kernel_include', 'cdomain', 'kfigure', 'sphinx.ext.ifconfig'] +extensions = ['kerneldoc', 'rstFlatTable', 'kernel_include', 'cdomain', + 'kfigure', 'sphinx.ext.ifconfig', 'automarkup'] # The name of the math extension changed on Sphinx 1.4 if (major == 1 and minor > 3) or (major > 1): diff --git a/Documentation/sphinx/automarkup.py b/Documentation/sphinx/automarkup.py new file mode 100644 index 000000000000..b300cf129869 --- /dev/null +++ b/Documentation/sphinx/automarkup.py @@ -0,0 +1,93 @@ +# SPDX-License-Identifier: GPL-2.0 +# Copyright 2019 Jonathan Corbet <corbet@lwn.net> +# +# Apply kernel-specific tweaks after the initial document processing +# has been done. +# +from docutils import nodes +from sphinx import addnodes +import re + +# +# Regex nastiness. Of course. +# Try to identify "function()" that's not already marked up some +# other way. Sphinx doesn't like a lot of stuff right after a +# :c:func: block (i.e. ":c:func:`mmap()`s" flakes out), so the last +# bit tries to restrict matches to things that won't create trouble. +# +RE_function = re.compile(r'([\w_][\w\d_]+\(\))') + +# +# Many places in the docs refer to common system calls. It is +# pointless to try to cross-reference them and, as has been known +# to happen, somebody defining a function by these names can lead +# to the creation of incorrect and confusing cross references. So +# just don't even try with these names. +# +Skipfuncs = [ 'open', 'close', 'read', 'write', 'fcntl', 'mmap' + 'select', 'poll', 'fork', 'execve', 'clone', 'ioctl'] + +# +# Find all occurrences of function() and try to replace them with +# appropriate cross references. +# +def markup_funcs(docname, app, node): + cdom = app.env.domains['c'] + t = node.astext() + done = 0 + repl = [ ] + for m in RE_function.finditer(t): + # + # Include any text prior to function() as a normal text node. + # + if m.start() > done: + repl.append(nodes.Text(t[done:m.start()])) + # + # Go through the dance of getting an xref out of the C domain + # + target = m.group(1)[:-2] + target_text = nodes.Text(target + '()') + xref = None + if target not in Skipfuncs: + lit_text = nodes.literal(classes=['xref', 'c', 'c-func']) + lit_text += target_text + pxref = addnodes.pending_xref('', refdomain = 'c', + reftype = 'function', + reftarget = target, modname = None, + classname = None) + xref = cdom.resolve_xref(app.env, docname, app.builder, + 'function', target, pxref, lit_text) + # + # Toss the xref into the list if we got it; otherwise just put + # the function text. + # + if xref: + repl.append(xref) + else: + repl.append(target_text) + done = m.end() + if done < len(t): + repl.append(nodes.Text(t[done:])) + return repl + +def auto_markup(app, doctree, name): + # + # This loop could eventually be improved on. Someday maybe we + # want a proper tree traversal with a lot of awareness of which + # kinds of nodes to prune. But this works well for now. + # + # The nodes.literal test catches ``literal text``, its purpose is to + # avoid adding cross-references to functions that have been explicitly + # marked with cc:func:. + # + for para in doctree.traverse(nodes.paragraph): + for node in para.traverse(nodes.Text): + if not isinstance(node.parent, nodes.literal): + node.parent.replace(node, markup_funcs(name, app, node)) + +def setup(app): + app.connect('doctree-resolved', auto_markup) + return { + 'parallel_read_safe': True, + 'parallel_write_safe': True, + } |