sagetex/arara: SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXXXXX escape

Question

Following up this answer, I have the following error in the arara's log file

SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXXXXX escape

when using this sagetex.yaml rule

!config
# SageTeX-Rule for arara.
#
# Dear Windows-users, please check the paths
# pathToBashExecutive    and    pathToSageStartfile
# due to your Sage-installation!
#
identifier: sagetex
name: SageTeX
authors:
- TeXnician (Author)
- cis (Idea)
arguments: []
commands:
- name: A SageTeX Rule for arara
  command: >
    @{
        pathToBashExecutive = "C:\\Program Files\\SageMath 9.1\\runtime\\bin\\bash";
        pathToSageStartfile = "C:/Program Files/SageMath 9.1/runtime/opt/sagemath-9.1/sage";
        pathOfCurrentWorkingFolder = currentFile().getParent();
        theWindowsCommand = getCommand(pathToBashExecutive, "-l", pathToSageStartfile, "-c", "os.chdir('" + pathOfCurrentWorkingFolder + "'); load('" + getBasename(currentFile()) + ".sagetex.sage')");
        return isWindows(theWindowsCommand, getCommand("sage", getBasename(reference) + ".sagetex.sage"));
       }

to compile the following document

% arara: lualatex
% arara: sagetex
% arara: lualatex
\documentclass{article}
\usepackage{sagetex}
\begin{document}
Using Sage\TeX, one can use Sage to compute things and put them into
your \LaTeX{} document. For example, there are
$\sage{number_of_partitions(1269)}$ integer partitions of $1269$.
You don't need to compute the number yourself, or even cut and paste
it from somewhere.

Here's some Sage code:
\begin{sageblock}
    f(x) = exp(x) * sin(2*x)
\end{sageblock}

The second derivative of $f$ is
\[
\frac{\mathrm{d}^{2}}{\mathrm{d}x^{2}} \sage{f(x)} =
\sage{diff(f, x, 2)(x)}.
\]
Here's a plot of $f$ from $-1$ to $1$:
\sageplot{plot(f, -1, 1)}

\end{document}

Full arara's log file can be found here.

Answer 1

I think (I hope) I've found the solution to the problem.

using: "C:\Users\Pedro Jose\AppData\Local\SageMath 9.1\runtime\bin\bash" -l "C:/Users/Pedro Jose/AppData/Local/SageMath 9.1/runtime/opt/sagemath-9.1/sage" -c "os.chdir('D:/'); load('prueba.sagetex.sage')"

sage works. I think the problem is inside os.chdir(), because we have to use / instead of \. If there is any way to change inside the arara rule "PathOfWorkingFolder" the delimiter \ to / it's probably the rule finaly works.

Here is my test image:

Edit: Using \\ on the sage console os.chdir('d:\\') works, but in the command line on cmd it doesn't work.

and finaly, I've found the solution. you have to edit thewinndowsCommand and add an rjust after "os.chdir(

Then, that part should be like "os.chdir(r'" and that's all. Sagetex rule works.

The full code is:

!config
# SageTeX-Rule for arara.
#
# Dear Windows-users, please check the paths
# pathToBashExecutive    and    pathToSageStartfile
# due to your Sage-installation!
#
identifier: sagetex
name: SageTeX
authors:
- TeXnician (Author)
- cis (Idea)
- Pedro J (final fix)
arguments: []
commands:
- name: A SageTeX Rule for arara
  command: >
    @{
        pathToBashExecutive = "C:\\Program Files\\SageMath 9.1\\runtime\\bin\\bash";
        pathToSageStartfile = "C:/Program Files/SageMath 9.1/runtime/opt/sagemath-9.1/sage";
        pathOfCurrentWorkingFolder = currentFile().getParent();
        theWindowsCommand = getCommand(pathToBashExecutive, "-l", pathToSageStartfile, "-c", "os.chdir(r'" + pathOfCurrentWorkingFolder + "'); load('" + getBasename(currentFile()) + ".sagetex.sage')");
        return isWindows(theWindowsCommand, getCommand("sage", getBasename(reference) + ".sagetex.sage"));
       }