Use graphviz instead of seqdiag, allow pillow upgrade to latest

.readthedocs.yml

@@ -10,6 +10,8 @@ build:
   os: ubuntu-22.04
   tools: 
     python: "3.12"
+  apt_packages:
+    - graphviz
 
 # Optionally build your docs in additional formats such as PDF and ePub
 formats:

docs/requirements.txt

@@ -6,7 +6,6 @@ m2r2==0.3.3.post2
 breathe==4.35.0
 sphinxcontrib-wavedrom
 sphinx-copybutton
-sphinxcontrib-seqdiag
 jinja2>=3.0.3
 setuptools>=57.5.0
-pillow==9.5.0 # V10 breaks seqdiag
+pillow

docs/source/conf.py

@@ -48,7 +48,7 @@
 extensions = [
     'm2r2',
     'breathe',
-    'sphinxcontrib.seqdiag',
+    'sphinx.ext.graphviz',
     'link-roles',
     'sphinxcontrib.wavedrom',
     'sphinx_copybutton',

docs/source/information/tasks.rst

@@ -17,30 +17,30 @@ The BasicTask class
 This class uses the task queue plus a timer to provide an easy way to write a background task.
 All you need to is define a *loop()* function which does the work. The task has three states:
 
-.. seqdiag::
+.. graphviz::
    :caption: Task states
    :align: center
-   
-   seqdiag task-states {
-      activation = none;
-      node_width = 80;
-      node_height = 60;
-      edge_length = 160;
-      span_height = 5;
-      default_shape = roundedbox;
-      default_fontsize = 12; 
-
-      SUSPENDED [label = "suspended"];
-      RUNNING [label = "running"];
-      SLEEPING [label = "sleeping"];
-
-      SUSPENDED -> RUNNING [label = "resume()"];
-      SUSPENDED -> SLEEPING [label = "sleep()"];
-      RUNNING -> SLEEPING [label = "sleep()"];
-      RUNNING -> SUSPENDED [label = "suspend()"];
-      SLEEPING -> RUNNING [label = "resume()"];
-      SLEEPING -> RUNNING [label = "timer expired"];
-      SLEEPING -> SUSPENDED [label = "suspend()"];
+
+   digraph "task-states" {
+      activation = none
+      node_width = 80
+      node_height = 60
+      edge_length = 160
+      span_height = 5
+      default_shape = roundedbox
+      default_fontsize = 12
+
+      SUSPENDED [label = "suspended"]
+      RUNNING [label = "running"]
+      SLEEPING [label = "sleeping"]
+
+      SUSPENDED -> RUNNING [label = "resume()"]
+      SUSPENDED -> SLEEPING [label = "sleep()"]
+      RUNNING -> SLEEPING [label = "sleep()"]
+      RUNNING -> SUSPENDED [label = "suspend()"]
+      SLEEPING -> RUNNING [label = "resume()"]
+      SLEEPING -> RUNNING [label = "timer expired"]
+      SLEEPING -> SUSPENDED [label = "suspend()"]
    }
 
 To see this in operation, have a look at the :sample:`Basic_Tasks` sample.