listener: completion sensitive for slots and methods.

When completing .prefix[TAB], .(prefix[TAB] or .[prefix[TAB],
restrict identifiers to the appropriate namespace.  The former
will report only symbols from the relevant package which are
struct slots; the latter further restricts it to those which
are static slots defined as functions.

* lib.c (symbol_visible): Static function becomes extern.

* lib.h (symbol_visible): Declared.

* parser.c (find_matching_syms): par parameter is renamed
kind and can hold additional values 'S' (slots) and 'M'
(methods). New get_slot_syms function is used to fetch the
slots, as necessary, instead of the visible syms, if the
kind is 'S' or 'M'. The same loop as before (with the minor
change of recognizing 'S' and 'M' also) performs the prefix
matching.
(provide_completions): Recognize . .( and .[ prefix,
calculating the kind argument of find_matching_syms in
a new way.

* struct.c (get_slot_syms): New function.

* struct.h (get_slot_syms): Declared.

* txr.1: Add some notes about this under the description of
completion. The full rules are not given though; let the
user discover.

1 files changed, 1 insertions, 0 deletions

diff --git a/struct.h b/struct.h
index d7f30f0d..10f87f72 100644
--- a/struct.h
+++ b/struct.h
@@ -63,4 +63,5 @@ val super_method(val strct, val slotsym);
 val uslot(val slot);
 val umethod(val slot, struct args *);
 val method_name(val fun);
+val get_slot_syms(val package, val is_current, val method_only);
 void struct_init(void);