doc: extensions: remove eager_only

The eager_only is currently breaking the usage of the `.. only``
directive, so remove it. Documentation seems to build fine without it,
so it has been removed for now.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>

doc/_extensions/only/eager_only.py

@@ -1,56 +0,0 @@
-#
-# This is a Sphinx documentation tool extension which makes .only::
-# directives be eagerly processed early in the parsing stage. This
-# makes sure that content in .only:: blocks gets actually excluded
-# as a typical user expects, instead of bits of information in
-# these blocks leaking to documentation in various ways (e.g.,
-# indexes containing entries for functions which are actually in
-# .only:: blocks and thus excluded from documentation, etc.)
-# Note that with this extension, you may need to completely
-# rebuild a doctree when switching builders (i.e. completely
-# remove _build/doctree dir between generation of HTML vs PDF
-# documentation).
-#
-# This extension works by monkey-patching Sphinx core, so potentially
-# may not work with untested Sphinx versions. It tested to work with
-# 1.2.2 and 1.4.2
-#
-# Copyright (c) 2016 Paul Sokolovsky
-# Based on idea by Andrea Cassioli:
-# https://github.com/sphinx-doc/sphinx/issues/2150#issuecomment-171912290
-#
-# SPDX-License-Identifier: Apache-2.0
-#
-import sphinx
-from docutils.parsers.rst import directives
-
-
-class EagerOnly(sphinx.directives.other.Only):
-
-    def run(self, *args):
-        # Evaluate the condition eagerly, and if false return no nodes right away
-        env = self.state.document.settings.env
-        env.app.builder.tags.add('TRUE')
-
-        if not env.app.builder.tags.eval_condition(self.arguments[0]):
-            return []
-
-        # Otherwise, do the usual processing
-        nodes = super(EagerOnly, self).run()
-        if len(nodes) == 1:
-            nodes[0]['expr'] = 'TRUE'
-        return nodes
-
-
-def setup(app):
-    directives.register_directive('only', EagerOnly)
-
-    # The tags.add call above is setting tags.tags['TRUE'] = True.
-    # The operation is idempotent and will have taken effect before
-    # the next eval_condition() which may rely on it so this is thread
-    # safe both for read and writes (all other operations are local to
-    # the local nodes variable).
-    return {
-        'parallel_read_safe': True,
-        'parallel_write_safe': True,
-        }

doc/conf.py

@@ -76,7 +76,6 @@ extensions = [
     "sphinx.ext.autodoc",
     "zephyr.application",
     "zephyr.html_redirects",
-    "only.eager_only",
     "zephyr.kconfig-role",
     "zephyr.dtcompatible-role",
     "zephyr.link-roles",