[PATCH] doc: set up for autoapi / readthedocs compatibility

[David Bremner <david@tethera.net>]

sphinx-autoapi seems nicer conceptually (it parses the docs rather
than importing them), but it also generates a ton of warnings, so
leave the default as autodoc.
---

You can see the results of this (for now) at https://notmuch.readthedocs.io/en/rtdtest/
We'd presumable want to integrate the whole tree somehow into notmuchmail.org

 doc/conf.py                                   | 42 ++++++++++---------
 doc/index.rst                                 |  3 +-
 doc/python-autoapi.rst                        |  5 +++
 ...python-bindings.rst => python-autodoc.rst} |  0
 doc/requirements.txt                          |  2 +
 5 files changed, 31 insertions(+), 21 deletions(-)
 create mode 100644 doc/python-autoapi.rst
 rename doc/{python-bindings.rst => python-autodoc.rst} (100%)
 create mode 100644 doc/requirements.txt

diff --git a/doc/conf.py b/doc/conf.py
index 94e266af..c34c03ac 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -4,7 +4,28 @@
 import sys
 import os
 
-extensions = [ 'sphinx.ext.autodoc' ]
+location = os.path.dirname(__file__)
+bindings_path =  os.path.join(location, '..', 'bindings', 'python-cffi','notmuch2')
+exclude_patterns = ['_build']
+
+# read generated config
+for pathdir in ['.', '..']:
+    conf_file = os.path.join(location,pathdir,'sphinx.config')
+    if os.path.exists(conf_file):
+        with open(conf_file,'r') as infile:
+            exec(''.join(infile.readlines()))
+
+if tags.has("AUTOAPI") or os.environ.get('READTHEDOCS') == 'True':
+    extensions = [ 'autoapi.extension' ]
+    autoapi_dirs = [ bindings_path ]
+    autoapi_add_toctree_entry = False
+    exclude_patterns.append('python-autodoc.rst')
+elif tags.has('WITH_PYTHON'):
+    extensions = [ 'sphinx.ext.autodoc' ]
+    sys.path.insert(0, bindings_path)
+    exclude_patterns.append('python-autoapi.rst')
+else:
+    exclude_patterns.append('python-autodoc.rst', 'python-autoapi.rst')
 
 # The suffix of source filenames.
 source_suffix = '.rst'
@@ -16,31 +37,15 @@ master_doc = 'index'
 project = u'notmuch'
 copyright = u'2009-2020, Carl Worth and many others'
 
-location = os.path.dirname(__file__)
-
 for pathdir in ['.', '..']:
     version_file = os.path.join(location,pathdir,'version')
     if os.path.exists(version_file):
         with open(version_file,'r') as infile:
             version=infile.read().replace('\n','')
 
-# for autodoc
-sys.path.insert(0, os.path.join(location, '..', 'bindings', 'python-cffi', 'notmuch2'))
-
-# read generated config
-for pathdir in ['.', '..']:
-    conf_file = os.path.join(location,pathdir,'sphinx.config')
-    if os.path.exists(conf_file):
-        with open(conf_file,'r') as infile:
-            exec(''.join(infile.readlines()))
-
 # The full version, including alpha/beta/rc tags.
 release = version
 
-# List of patterns, relative to source directory, that match files and
-# directories to ignore when looking for source files.
-exclude_patterns = ['_build']
-
 if tags.has('WITH_EMACS'):
     # Hacky reimplementation of include to workaround limitations of
     # sphinx-doc
@@ -55,9 +60,6 @@ else:
     # the docstring include files
     exclude_patterns.append('notmuch-emacs.rst')
 
-if not tags.has('WITH_PYTHON'):
-    exclude_patterns.append('python-bindings.rst')
-
 # The name of the Pygments (syntax highlighting) style to use.
 pygments_style = 'sphinx'
 
diff --git a/doc/index.rst b/doc/index.rst
index a3bf3480..3493d7b4 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -26,7 +26,8 @@ Contents:
    man7/notmuch-search-terms
    man1/notmuch-show
    man1/notmuch-tag
-   python-bindings
+   python-autodoc
+   python-autoapi
 
 Indices and tables
 ==================
diff --git a/doc/python-autoapi.rst b/doc/python-autoapi.rst
new file mode 100644
index 00000000..fb968874
--- /dev/null
+++ b/doc/python-autoapi.rst
@@ -0,0 +1,5 @@
+Python Bindings
+===============
+
+.. autoapimodule:: notmuch2
+   :members:
diff --git a/doc/python-bindings.rst b/doc/python-autodoc.rst
similarity index 100%
rename from doc/python-bindings.rst
rename to doc/python-autodoc.rst
diff --git a/doc/requirements.txt b/doc/requirements.txt
new file mode 100644
index 00000000..519ccd35
--- /dev/null
+++ b/doc/requirements.txt
@@ -0,0 +1,2 @@
+# for readthedocs, or other standalone builds of the docs.
+sphinx-autoapi
-- 
2.27.0