Build is broken, update everything

Immediate problem appears to be `funcparserlib`.
See vlasovskikh/funcparserlib#70.

Found mr2r (mr2 is out of date) and can now use sphinx 4.

.readthedocs.yml

@@ -8,11 +8,13 @@ version: 2
 # Optionally build your docs in additional formats such as PDF and ePub
 formats:
   - htmlzip
-#  - pdf
+
+sphinx:
+  configuration: docs/source/conf.py
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-  version: 3.7
+  version: 3.8
   install:
     - requirements: docs/requirements.txt
 

docs/requirements.txt

@@ -1,11 +1,12 @@
 # Requirements file for pip
 # list of Python packages used in documentation build
-sphinx==2.4.4
+sphinx==4.2.0
 sphinx-rtd-theme
-m2r
-breathe==4.13.0
+m2r2
+breathe==4.31.0
 sphinxcontrib-wavedrom
 sphinx-copybutton
-sphinxcontrib-seqdiag>=0.8.5
-jinja2>=2.11.3
-setuptools==57.5.0
+sphinxcontrib-seqdiag==2.0.0
+jinja2==2.11.3
+setuptools>=57.5.0
+funcparserlib==1.0.0a0

docs/source/conf.py

@@ -45,7 +45,7 @@
 # so developers can more easily locate the appropriate reference documentation.
 #
 extensions = [
-    'm2r',
+    'm2r2',
     'breathe',
     'sphinxcontrib.seqdiag',
     'link-roles',
@@ -101,6 +101,10 @@
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
 
+html_css_files = [
+    'custom.css',
+]
+
 html_extra_path = [
     '../api/html'
 ]
@@ -134,6 +138,3 @@
 
 subprocess.call('make -C ../../Sming submodules SMING_ARCH=Host', shell=True)
 subprocess.call('make -C .. setup api API_VERSION="' + version + '"', shell=True)
-
-def setup(app):
-    app.add_stylesheet('custom.css')