added show var usage (partially)

fs_edit_general.lua

@@ -702,7 +702,8 @@ yl_speak_up.input_fs_edit_option_related = function(player, formname, fields,
 		return
 	end
 
-	if(fields.back_from_cannot_be_edited) then
+	if(fields.back_from_cannot_be_edited
+	 or fields.back_from_show_var_usage) then
 		yl_speak_up.show_fs(player, formspec_input_to, x_id)
 		return
 	end
@@ -946,6 +947,37 @@ yl_speak_up.input_fs_edit_option_related = function(player, formname, fields,
 		was_changed = true
 	end
 
+	-- show var usage - starting from clicking on a precondition or effect in the
+	-- edit options menu and viewing the list containing that selected element
+	if( fields.show_var_usage and x_id) then
+		local dialog = yl_speak_up.speak_to[pname].dialog
+		local element = dialog.n_dialogs[d_id].d_options[o_id][ element_list_name ][ x_id ]
+		if(element and element[ id_prefix.."variable"]) then
+			-- TODO: actually implement/show usage of the variable as formspec
+			yl_speak_up.show_fs(player, "msg", {
+				input_to = "yl_speak_up:"..formspec_input_to,
+				formspec = "size[9,2]"..
+					"label[0.2,0.5;This ought to show usage of a variable.]"..
+					-- back to the list with that one precondition or effect
+					"button[1.5,1.5;2,0.9;back_from_show_var_usage;Back]"})
+			return
+		end
+	-- show var usuage - but this time from the edit dialog for that precondition or effect
+	elseif(fields.show_var_usage_edit_element and x_id) then
+		local dialog = yl_speak_up.speak_to[pname].dialog
+		local element = dialog.n_dialogs[d_id].d_options[o_id][ element_list_name ][ x_id ]
+		if(element and element[ id_prefix.."variable"]) then
+			-- TODO: actually implement/show usage of the variable as formspec
+			yl_speak_up.show_fs(player, "msg", {
+				input_to = "yl_speak_up:"..formspec_input_to,
+				formspec = "size[9,2]"..
+					"label[0.2,0.5;This ought to show usage of a variable.]"..
+					-- back to editing that particular precondition or effect
+					"button[1.5,1.5;2,0.9;back_from_error_msg;Back]"})
+			return
+		end
+	end
+
 	-- the player wants to change/edit a precondition or effect
 	if(not(fields.back)
 	  and (fields.change_element or fields.select_what or fields.select_trade
@@ -1108,6 +1140,16 @@ yl_speak_up.get_fs_edit_option_related = function(player, table_click_result,
 			x_id = table_click_result
 		end
 
+		local show_var_usage = ""
+		if(x_id
+		  and elements
+		  and elements[ x_id ]
+		  and elements[ x_id ][ id_prefix.."type"]
+		  and elements[ x_id ][ id_prefix.."type"] == "state"
+		  and elements[ x_id ][ id_prefix.."variable"]) then
+			show_var_usage = "button[12.0,1.8;6.5,0.9;show_var_usage;"..
+					"Show where this variable is used]"
+		end
 		-- store which element we are talking about
 		yl_speak_up.speak_to[pname][ id_prefix.."id" ] = x_id
 		-- nothing selected yet
@@ -1129,7 +1171,8 @@ yl_speak_up.get_fs_edit_option_related = function(player, table_click_result,
 				"button[2.0,1.8;1.5,0.9;delete_element;Delete]"..
 				"button[4.0,1.8;1.5,0.9;change_element;Change]"..
 				"button[6.0,1.8;5.5,0.9;back;Back to edit dialog option \""..
-					tostring(o_id).."\"]"
+					tostring(o_id).."\"]"..
+				show_var_usage
 		end
 	end
 
@@ -1365,6 +1408,7 @@ yl_speak_up.get_fs_edit_option_p_and_e_state = function(
 		"label[11.2,4.3;"..text_select_value.."]"..
 		field_for_value..
 		"button[0.2,6.0;4.0,0.6;manage_variables;Manage variables]"..
+		"button[4.7,6.0;6.5,0.6;show_var_usage_edit_element;Show where this variable is used]"..
 		"hypertext[1.2,7.0;16.0,2.5;some_text;<normal>"..
 			"<b>Note:</b> Each variable is player-specific and will be set and "..
 			"checked for the player that currently talks to your NPC.\n"..