multiple SC version support

hi list,

right now, getting multiple SC versions installed on the same system is 
nontrivial. considering that 3.x versions are in general not compatible, 
i have a simple proposal to help ensure clean separation between 
multiple 3.x's, inspired by the way python does things:

- we subdivide the various library directories by version: 
/usr/local/lib/SuperCollider/3.9/plugins, 
/usr/local/share/SuperCollider/3.9/SCClassLibrary
- we tack the version number onto the executables: /usr/bin/scsynth3.9 
and /usr/bin/sclang3.9

the path examples i've given are for Linux, but i think you get the 
idea.

i haven't really thought through how configuration files would carry 
over. i think it's reasonable that e.g. your sc_lang_conf.yaml and 
sc_ide_conf.yaml should be retained when you upgrade. quarks, probably 
not. server plugins, definitely not, considering ABI changes.

any thoughts?


nathan

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