'protect' used to be renamed to 'guard', after excluding 'guard'
from (scheme base). But that part is now gone. test.scm itself never
uses 'protect' directly. Remove it because it's not used.
Currently "remove" command does not know how to use sudo to remove
files installed into directories owned by root. By default Snow
installs stuff into /usr/local hierarchy and uses sudo for that.
Let's teach it to remove packages without explicit sudo too.
Snow-Chibi is a local package manager, not a system one. It can install
Scheme packages into system but they are not managed by system package
manager like dpkg, RPM, pacman, ports, etc.
Traditionally (and in accordance with Filesystem Hierarchy Standard),
/usr/local hierarchy should be used for local administrator installs --
and that's what Snow-Chibi provides.
Let's make sure that Snow-Chibi installs snowballs into /usr/local
hierarchy even if Chibi is compiled for installation into the system,
with PREFIX=/usr. Introduce a distinct bunch of variables holding paths
to library installation directories, with "SNOW" prefix:
- SNOWPREFIX - default prefix for Snow-installed stuff
- SNOWLIBDIR - custom libraries required for Snow itself
- SNOWSOLIBDIR - shared libraries required for Snow itself
- SNOWMODDIR - Snow installs Scheme modules here
- SNOWBINMODDIR - Snow installs native libraries here
All of these are set to /use/local by default, just as they are now.
However, they are not affected by regular PREFIX, LIBDIR, MODDIR, etc.
which affect only libraries bundled with Chibi.
And in order for these to work, they need to be added into the current
module path so that they can be used in parallel with system libraries.
Furthermore, we need to tweak "get-install-library-dir" function to use
those paths instead of hardcoded "/usr/local/lib" by default. Introduce
a new helper "get-install-library-dirs", similar to "get-install-dirs".
It will look up the correct installation directories in current module
path, giving preference to the ones with "/lib" in them.
With these defaults, Snow will install Scheme modules into
/usr/local/share/snow and native libraries go into /usr/local/lib/snow,
similar to how built-it libraries are installed into
/usr/local/share/chibi and /usr/local/lib/chibi is used for native code.
Of course, this can be overriden at build time by setting SNOWPREFIX or
individual SNOWMODDIR, SNOWBINMODDIR variables.
