quarto_attributes hook

Sometimes using the build hook (or the brei hook, see below), leads to long header lines. It is then better to specify attributes in a header section of your code. The Quarto project came up with a syntax, having the header be indicated by a comment with a vertical bar, e.g. #| or //| etc. The quarto_attributes hook reads those attributes and adds them to the properties of the code block.

Example with the brei hook:

``` {.python .task}
#| description: Draw a triangle
#| creates: docs/fig/triangle.svg
#| collect: figures
from matplotlib import pyplot as plt
plt.plot([[-1, -0.5], [1, -0.5], [0, 1], [-1, -0.5]])
plt.savefig("docs/fig/triangle.svg")
```

![](fig/triangle.svg)

Using these attributes it is possible to write in Entangled using completely standard Markdown syntax.

The id attribute is reserved for the code's identifier (normally indicated with #) and the classes attribute can be used to indicate a list of classes in addition to the language class already given.