Wrong behavior when :dir set

[akirakyle]

When setting the :dir header argument, it looks like the path is being expanded twice.

For example the following block run in a file in /home/notebook

#+BEGIN_SRC jupyter-python :dir src
print("hi")
#+END_SRC

will result in the error

FileNotFoundErrorTraceback (most recent call last)
<ipython-input-1-1028f0c44f21> in <module>
      1 import os
      2 __JUPY_saved_dir = os.getcwd()
----> 3 os.chdir("/home/notebook/src/src")
      4 try:
      5     get_ipython().run_cell("""%load_ext autoreload

FileNotFoundError: [Errno 2] No such file or directory: '/home/notebook/src/src'

It appears this is due to org changing default-directory before org-babel-expand-body:jupyter is called so then (expand-file-name dir) is expanding again. As a patch I just replaced that call with default-directory and it works.

[akirakyle]

I also found another issue with setting :dir in jupyter-python. It seems org-babel-jupyter-transform-code isn't escaping the code correctly. Hence the following issue

#+BEGIN_SRC jupyter-python :session py :dir src
print(r"\r")
#+END_SRC

#+RESULTS:
:RESULTS:
# [goto error]
:   File "<ipython-input-16-37eae21e09aa>", line 1
:     print(r"
:             ^
: SyntaxError: EOL while scanning string literal
:END:

[nnicandro]

I can confirm both of your issues.

For the first one, I thinks it's just a matter of using default-directory whenever Org sets it, i.e. when the source block is being executed. I don't think we should change org-babel-expand-body:jupyter since it has the potential to be used outside of source block execution where I think it makes sense to handle :dir in the way it does.

For the second one, the fix seems to be to mark the string passed to get_ipython().run_cell as a raw string in the code below. That way backslashes are treated as any other character in the expanded code.

https://github.com/nnicandro/emacs-jupyter/blob/0dec83f7e4a125c73430a45c2fb2119dcc31bd28/jupyter-python.el#L98-L105

[nnicandro]

Both issues should be fixed by 113acb2 and a2cbebd.