diagram-generator: Support passing width and height in a block

Closes: #242

Author: fuhrmanator

diagram-generator/README.md

@@ -36,7 +36,7 @@ set to the absolute path of `java.exe` e.g.
 Example usage:
 
 ~~~~~~~~~~~~~~~~
-```{.plantuml caption="This is an image, created by **PlantUML**."}
+```{.plantuml caption="This is an image, created by **PlantUML**." width=50%}
 @startuml
 Alice -> Bob: Authentication Request Bob --> Alice: Authentication Response
 Alice -> Bob: Another authentication Request Alice <-- Bob: another Response

diagram-generator/diagram-generator.lua

@@ -361,7 +361,7 @@ function CodeBlock(block)
   local title = #caption > 0 and "fig:" or ""
 
   -- Transfer identifier and other relevant attributes from the code
-  -- block to the image. Currently, only `name` is kept as an attribute.
+  -- block to the image. The `name` is kept as an attribute.
   -- This allows a figure block starting with:
   --
   --     ```{#fig:example .plantuml caption="Image created by **PlantUML**."}
@@ -370,7 +370,9 @@ function CodeBlock(block)
   -- with `pandoc-crossref`.
   local img_attr = {
     id = block.identifier,
-    name = block.attributes.name
+    name = block.attributes.name,
+    width = block.attributes.width,
+    height = block.attributes.height
   }
 
   -- Create a new image for the document's structure. Attach the user's

diagram-generator/sample.md

@@ -35,7 +35,7 @@ set to the absolute path of `java.exe` e.g.
 
 Example usage:
 
-```{.plantuml caption="This is an image, created by **PlantUML**."}
+```{.plantuml caption="This is an image, created by **PlantUML**." width=50%}
 @startuml
 Alice -> Bob: Authentication Request Bob --> Alice: Authentication Response
 Alice -> Bob: Another authentication Request Alice <-- Bob: another Response