[Distutils] Shebang lines on Jython

[Philip Jenvey]

Speaking of shebang lines, there's problems with setuptools shebang  
lines on Jython. Unfortunately it's going to require another patch or  
two to setuptools.

The problem being that Jython's executable is a .sh or .bat file  
(that'll invoke java), and interpreters in shebang lines can't be  
interpreter files, i.e. another script. Running a .py script that  
shebangs the Jython .sh executable directly will result in something  
along the lines of a "test.py: line 2 import command not found" sh  
error.

For posix, we'll just need to special case Jython on posix to make a  
shebang along the lines of:

#!/usr/bin/env /opt/local/bin/jython

Windows isn't as easy. setuptools' launcher.c similarly can't use  
a .bat file as the interpreter. A workaround would be to use cmd.exe / 
c in the same way we'll use /usr/bin/env on posix. launcher.c  
currently can't handle this, though, the problem being it can't  
correctly quote the cmd.exe /c line correctly.

With:

#!c:\windows\system32\cmd.exe /c c:\jython2.2\jython.bat

launcher.c ends up calling:

"c:\windows\system32\cmd.exe" "/c" "c:\jython2.2\jython.bat" "c: 
\scripts\myscript-script.py"

when we need:

"c:\windows\system32\cmd.exe" /c ""c:\jython2.2\jython.bat" "c: 
\scripts\myscript-script.py""

which is another set of quotes around the entire /c arg, and yes no  
quotes around /c (I have no idea why "/c" doesn't work).

I guess we would have to patch launcher.c to deal with this special  
situation or make a custom version for Jython. That's pretty awful --  
might anyone have a simpler way of handling this?

--
Philip Jenvey