Installed jep script contains syntax errors

[seletz]

Describe the problem

After installing, the generated jet binary contains syntax errors wrt exporting the PYTHONEXECUTABLE env var.

Search for existing solutions

None found. PR follows.

Environment (please complete the following information):

$ uname -a
Darwin NewEden 21.3.0 Darwin Kernel Version 21.3.0: Wed Jan  5 21:37:58 PST 2022; root:xnu-8019.80.24~20/RELEASE_X86_64 x86_64
$ python --version
Python 3.7.6
$ java -version
openjdk version "17.0.2" 2022-01-18
OpenJDK Runtime Environment Temurin-17.0.2+8 (build 17.0.2+8)
OpenJDK 64-Bit Server VM Temurin-17.0.2+8 (build 17.0.2+8, mixed mode, sharing)

No additional packages, clean python env.

Logs

via 🐍 v3.7.6 (jep) ❯ python setup.py install
numpy not found, running without numpy support
running install
running build
running setup_java
running build_java
running build_jar
running build_py
running build_ext
running build_scripts
copying and adjusting src/main/scripts/jep -> build/scripts-3.7
changing mode of build/scripts-3.7/jep from 644 to 755
running install_lib
copying build/lib.macosx-10.15-x86_64-3.7/jep/jep.cpython-37m-darwin.so -> /Users/seletz/develop/research/jep/lib/python3.7/site-packages/jep
copying build/java/jep-4.0.2.jar -> /Users/seletz/develop/research/jep/lib/python3.7/site-packages/jep
ln -sf jep.cpython-37m-darwin.so /Users/seletz/develop/research/jep/lib/python3.7/site-packages/jep/libjep.jnilib
running install_scripts
copying build/scripts-3.7/jep -> /Users/seletz/develop/research/jep/bin
changing mode of /Users/seletz/develop/research/jep/bin/jep to 755
running install_egg_info
Removing /Users/seletz/develop/research/jep/lib/python3.7/site-packages/jep-4.0.2-py3.7.egg-info
Writing /Users/seletz/develop/research/jep/lib/python3.7/site-packages/jep-4.0.2-py3.7.egg-info

jep on fix-export-syntax-for-pythonexecutable [$]
via 🐍 v3.7.6 (jep) ❯ which jep
/Users/seletz/develop/research/jep/bin/jep

jep on fix-export-syntax-for-pythonexecutable [$]
via 🐍 v3.7.6 (jep) ❯ jep
/Users/seletz/develop/research/jep/bin/jep: line 4: export: `=': not a valid identifier
/Users/seletz/develop/research/jep/bin/jep: line 4: export: `/Users/seletz/develop/research/jep/bin/python': not a valid identifier
jep.JepException: <class 'ModuleNotFoundError'>: No module named 'jep'
        at <string>.<module>(<string>:1)
        at jep.Jep.eval(Native Method)
        at jep.Jep.eval(Jep.java:312)
        at jep.Jep.configureInterpreter(Jep.java:179)
        at jep.SharedInterpreter.configureInterpreter(SharedInterpreter.java:64)
        at jep.Jep.<init>(Jep.java:159)
        at jep.SharedInterpreter.<init>(SharedInterpreter.java:56)
        at jep.Run.run(Run.java:49)
        at jep.Run.main(Run.java:146)

[ndjensen]

Thank you for finding this, tracking it down, reporting it, and fixing it!