Replace the unknown skill dance by skill training restrictions.

There's no more restriction on training unknown skills. By default, they are
disabled in manual mode and enabled in auto mode, but they can be freely
toggled if restrictions are met.

A skill can be trained if there's any available mean of exercising it.
Fighting, throwing, dodging, stealth, stabbing, T&D, UC and spellcasting can
always be trained.

Weapon skills require carrying a weapon of the type.
Armour requires wearing an armour with an evasion penalty.
Shields needs either wearing a shield, knowing condensation shield or being able
to cast it from a rod of warding or having the divine shield ability.
Evocations requires carrying an evocable item, or having a Nemelex ability.
Spell schools require knowing a spell of the school (Necromancy can be trained
with having a Kiku ability).
Invocations requires having any divine ability that exercises it.

For edge cases, requirements are a bit loose. No need to carry missiles to
train throwing (or it disables itself when you run out), no minimum spell
success, no cap on skill level with buckler and leather for example.

1 files changed, 1 insertions, 1 deletions

diff --git a/crawl-ref/source/invent.h b/crawl-ref/source/invent.h
index d9d1128da6..cd1fe59236 100644
--- a/crawl-ref/source/invent.h
+++ b/crawl-ref/source/invent.h
@@ -250,6 +250,6 @@ bool prompt_failed(int retval, std::string msg = "");
 bool item_is_wieldable(const item_def &item);
 bool item_is_evokable(const item_def &item, bool reach = true,
                       bool known = false, bool all_wands = false,
-                      bool msg = false);
+                      bool msg = false, bool equip = true);
 bool needs_handle_warning(const item_def &item, operation_types oper);
 #endif