Improve error message

[songjhaha]

Relate issue: #71

we can't redirect julia error before we call init_jl() succeeded, a simple solution is to log error message and print it in julia, like:

In [2]: np.init_jl()
   Resolving package versions...
SystemError: opening file "/home/songjhaha/github/jnumpy-repo/jnumpy/JNumPyEnv/Manifest.toml": Permission denied
Stacktrace:
  [1] systemerror(p::String, errno::Int32; extrainfo::Nothing)
    @ Base ./error.jl:174
  [2] #systemerror#68
    @ ./error.jl:173 [inlined]
...
---------------------------------------------------------------------------
JuliaError                                Traceback (most recent call last)
~/github/jnumpy-repo/jnumpy/init.py in init_jl(experimental_fast_init)
    199         try:
--> 200             exec_julia("import TyPython", use_gil=False)
    201         except JuliaError:
...

During handling of the above exception, another exception occurred:

JuliaError                                Traceback (most recent call last)
<ipython-input-2-922bdac64e73> in <module>
----> 1 np.init_jl()

~/github/jnumpy-repo/jnumpy/init.py in init_jl(experimental_fast_init)
    219                     use_gil=False,
    220                 )
--> 221                 raise JuliaError("failed to setup julia environment, check the julia error message above.")
    222         try:
    223             exec_julia(

JuliaError: failed to setup julia environment, check the julia error message above.

I think pyjulia(PyCall) have considered this situation: https://github.com/JuliaPy/pyjulia/blob/56a739126d3fed0d24e548069ff216fea78fbe1b/src/julia/core.py#L587

edit: the solution in pyjulia with lib.jl_typeof_str(lib.jl_exception_occurred()) could only get message like SystemError, so maybe it's not enough for debug.

@thautwarm

[codecov-commenter]

Codecov Report

Merging #72 (fa7a2b4) into main (89f1c6f) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #72   +/-   ##
=======================================
  Coverage   60.97%   60.97%           
=======================================
  Files          11       11           
  Lines         920      920           
=======================================
  Hits          561      561           
  Misses        359      359           

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.