[Nix-dev] proposal resurrecting bash completion

[Marc Weber]

Any volunteers testing this patch?

patch attached, proposed commit message:

    * resurrect bash completion honoring comments by Eelco in -rev 20179:
    
      - default is disabled
    
      - if configuration.nix turns it on user can still opt-out
        by defining NIX_SETUP_COMPLETION=0 before sourcing /etc/bashrc
        If he dislikes individual scripts he can disable them by
        setting keys in NIX_COMPL_SCRIPT_SOURCED. See example which was
        one of the reasons why it was disabled the last time by Eelco.
    
      - a bash completion script is only sourced once ever. Thus the first
        one wins.
    
    also document order of items in NIX_PROFILES which is now:
    1) user env
    2) default env (root)
    3) system env
    
    refactor so that the add a nix profile to env feature can be reused:
    nix_add_profile PATH [--prefix|--suffix]
    
    Should both function nix_add_profile and nix_export_a be unset?
    They may be useful..

Marc Weber
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