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Yet another of the niceties that comes out of just using guile's REPL
is that readline support is just figured out when building guile;
so by the time gnurobots is being built, readline support is either
there or it isn't--and even if our guile isn't readline-enabled,
we can still just run without readline (though, in practice,
I don't think I've ever seen a build of guile in the last 15 years
that didn't have readline...).
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This gives _much_ more useful readline behavior,
since (ice-9 readline) actually knows how to autocomplete
based on the scheme environment, handle multi-line input, etc.;
and properly displays return values and error-messages,
and supports switching to different front-end programming languages
like ecmascript.
Note that we're keeping catch_handler so that we have a chance
of diagnosing problems that could _conceivably_ occur
when interacting with guile during bootstrap
(e.g.: missing readline support, changed REPL API...).
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Users should no longer need to run from an xterm to see
to see things like final energy/score/odometry stats,
map-file path, copyright, load-messages, etc.
Note that this also means we no longer need to redirect readline,
since we're just redirecting *everything*.
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Fixes: <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=746000>
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Signed-off-by: Bradley Smith <brad@brad-smith.co.uk>
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