[Suggestion] Expose information about attacks being currently in progress

[e00E]

In events like "OnOrbImpact", OnAttackStart", "OnAttackLanded", and OnAttack" it would be helpful to be able to use some information about the attack like the actual damage of the attack or if the attack will miss.

Some abilities want to work on the exact damage an attack would do. For example you might want to mana burn scaling with attack damage. Currently you would have to use caster:AttackDamage or caster:GetAverageTrueAttackDamage which work but are not exact. Having this available would be helpful.
If this is taken a step further you would even be able to change those values on the fly. It could include things like projectile speed so you could make an orb effect that can change it's speed over time for example.

[pie4all88]

You should look into damage filters, which were recently added and give you much more control. tutorial_assist_game has an example:

GameRules:GetGameModeEntity():SetDamageFilter( Dynamic_Wrap( CTutorialAG, "FilterDamage" ), self )

function CTutorialAG:FilterDamage( filterTable )
--	for k, v in pairs( filterTable ) do
--		print("Damage: " .. k .. " " .. tostring(v) )
--	end

	if ( filterTable["entindex_victim_const"] == nil or filterTable["entindex_attacker_const"] == nil ) then
--		for k, v in pairs( filterTable ) do
--			print("Damage: " .. k .. " " .. tostring(v) )
--		end		
		return true
	end

	local hVictim = EntIndexToHScript( filterTable["entindex_victim_const"] )
	local hAttacker = EntIndexToHScript( filterTable["entindex_attacker_const"] )

	if ( hVictim ~= nil ) then
		if ( hVictim:IsBoss() ) then
			self:_IncrementAlert( ALERT_ROSHAN, 1.0 )
		end
	end

	local heroUnit = PlayerResource:GetSelectedHeroEntity( 0 )

	if ( hVictim ~= nil and hAttacker ~= nil and heroUnit ~= nil ) then
		if ( hVictim:IsCreep() and hAttacker:IsCreep() and hVictim:GetTeamNumber() == heroUnit:GetTeamNumber() and not self._bLateGame ) then
			if ( hVictim:GetRangeToUnit( heroUnit ) < 800 ) then
--				print("Want to increase creep damage " .. tostring(filterTable["damage"]) .. " -> " .. tostring(1.15*filterTable["damage"]) )
				filterTable["damage"] = 1.15*filterTable["damage"]
			end
		end
	end


	return true
end

I believe the return value indicates whether the attack should hit or not.