doc/common/extensions: Separate checkmark from image.

This makes it easier to see when the images are small.

Fixes: pybricks/support#838

doc/Makefile

@@ -16,8 +16,8 @@ help:
 .PHONY: help Makefile
 
 diagrams:
-	@$(MAKE) -C "$(SOURCEDIR)"/diagram_source clean
-	@$(MAKE) -C "$(SOURCEDIR)"/diagram_source
+	@$(MAKE) -C "$(SOURCEDIR)"/diagrams_source clean
+	@$(MAKE) -C "$(SOURCEDIR)"/diagrams_source
 
 # Catch-all target: route all unknown targets to Sphinx using the new
 # "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).

doc/common/extensions/requirements-static.py

@@ -47,20 +47,19 @@ def run(self):
             makedirs(destdir)
 
         for hub in HUB_FEATURES:
-            for compat in ("true", "false"):
-                uri = "compat_{0}_{1}.png".format(hub, compat)
-                src_uri = path.join(env.app.builder.srcdir, "diagrams", uri)
-                build_uri = path.join(env.app.builder.outdir, "_images", uri)
-                copyfile(src_uri, build_uri)
+            uri = "compat_{0}.png".format(hub)
+            src_uri = path.join(env.app.builder.srcdir, "diagrams", uri)
+            build_uri = path.join(env.app.builder.outdir, "_images", uri)
+            copyfile(src_uri, build_uri)
 
         # Get requirements from sphinx-directive.
         requirements = set(self.arguments)
 
         # Cell with image of a hub.
         hub_cell = """
-        <th><div class="align-default">
-        <img alt="" src="{0}_images/compat_{1}_{2}.png">
-        </div></th>
+        <th background="{0}_images/compat_{1}.png" class="requirements-table-th requirements-table-th">
+        {2}
+        </th>
         """
 
         # Determine how far up the tree we are to set correct image path.
@@ -72,7 +71,7 @@ def run(self):
         compat_row = "".join(
             [
                 hub_cell.format(
-                    depth_path, hub, "true" if requirements <= features else "false"
+                    depth_path, hub, "✅" if requirements <= features else "❌"
                 )
                 for hub, features in HUB_FEATURES.items()
             ]
@@ -81,7 +80,7 @@ def run(self):
         # Generate full table.
         html = """
         <div class="wy-table-responsive">
-            <table class="docutils align-default">
+            <table class="docutils align-default requirements-table">
                 <tbody>
                     <tr>
                         {0}

doc/common/extensions/requirements.css

@@ -42,3 +42,19 @@ SOFTWARE. */
     margin-bottom: 0px;
 }
 
+.requirements-table {
+    width: 100%;
+}
+
+.requirements-table-th {
+    background-size:contain;
+    background-repeat: no-repeat;
+    text-align: right;
+    padding: 6px !important;
+  }
+
+.requirements-table-th:after {
+    content: '';
+    display: block;
+    margin-top: 80%;
+  }