parsons-puzzle directive

`parsons-puzzle` directive#

The parsons-puzzle directive creates a Parsons puzzle where learners reorder shuffled code lines into the correct sequence.

```{parsons-puzzle}
:lang: python

def fib(n):
    if n <= 1:
        return n
    return fib(n-1) + fib(n-2)
```

By default each line is a separate draggable block. To create larger blocks, use a marker comment to group lines:

:::{parsons-puzzle}
:::{code-block} python
s = 0
# chunk
for i in range(5):
    s += i
# chunk
print(s)
:::
:::

Marker lines are not included in the final solved code.

You can customize the marker:

:::{parsons-puzzle}
:chunk-marker: # chunk

:::{code-block} python
...
:::
:::

Option	Meaning	Default
`lang`	Programming language for syntax highlighting	—
`chunk-marker`	Custom marker string for chunking	`# chunk`