aux auto bid and price heuristics

this commit does two things
1. it implements auto bid just like auto buy
2. it has some minimum pricing heuristics when posting items. this behavoiur actiaves when the post bid price is set to 0, the buyout price behaves like a minimum

aux-addon/util/completion.lua

@@ -0,0 +1,45 @@
+module 'aux.util.completion'
+
+local aux = require 'aux'
+local filter_util = require 'aux.util.filter'
+
+function M:complete_filter()
+	if IsControlKeyDown() then -- TODO problem is ctrl-v, maybe find a better solution
+		return
+	end
+
+	local filter_string = this:GetText()
+
+	local completed_filter_string = aux.select(3, strfind(filter_string, '([^;]*)/[^/;]*$'))
+	local _, suggestions = filter_util.query(completed_filter_string)
+
+	local start_index, _, current_modifier = strfind(filter_string, '([^/;]*)$')
+	current_modifier = current_modifier or ''
+
+	for _, suggestion in ipairs(suggestions) do
+		if strsub(strupper(suggestion), 1, strlen(current_modifier)) == strupper(current_modifier) then
+			this:SetText(strlower(strsub(filter_string, 1, start_index - 1) ..  suggestion))
+			this:HighlightText(strlen(filter_string), -1)
+			return
+		end
+	end
+end
+
+function M.complete(candidates)
+	return function(self)
+		if IsControlKeyDown() then -- TODO problem is ctrl-v, maybe find a better solution
+			return
+		end
+
+		local text = self:GetText()
+
+		local t = candidates()
+		for i = 1, getn(t) do
+			if strsub(strupper(t[i]), 1, strlen(text)) == strupper(text) then
+				self:SetText(strlower(t[i]))
+				self:HighlightText(strlen(text), -1)
+				return
+			end
+		end
+	end
+end