show what points to a dialog

fs_alternate_text.lua

@@ -339,3 +339,76 @@ yl_speak_up.get_fs_edit_dialog_modification = function(dialog, d_id, alternate_d
 		"button[6.0,12.3;1,0.7;save_dialog_modification;Save]"..
 		"button[9.0,12.3;6,0.7;turn_alternate_text_into_new_dialog;Turn this into a new dialog]"
 end
+
+
+-- show which dialogs point/lead to this_dialog
+yl_speak_up.show_what_points_to_this_dialog = function(player, pname, dialog, this_dialog)
+	if(not(dialog)
+	  or not(dialog.n_dialogs)
+	  or not(this_dialog)
+	  or not(dialog.n_dialogs[ this_dialog ])) then
+		return ""
+	end
+
+	local found = {}
+	-- iterate over all dialogs
+	for d_id, d in pairs(dialog.n_dialogs) do
+		-- we are looking for dialogs that point here - not the dialog itself
+		if(d_id ~= this_dialog and d.d_options) then
+			-- iterate over all options
+			for o_id, o in pairs(d.d_options) do
+				-- preconditions are not relevant;
+				-- effects are (dialog and on_failure)
+				if(o.o_results) then
+					for r_id, r in pairs(o.o_results) do
+						if(r and r.r_type and r.r_type == "dialog"
+						  and r.r_value == this_dialog) then
+							table.insert(found, {d_id, o_id, r_id,
+								"option was selected"})
+						elseif(r and r.r_type and r.r_type == "on_failure"
+						  and r.r_value == this_dialog) then
+							table.insert(found, {d_id, o_id, r_id,
+								"the previous effect failed"})
+						end
+					end
+				end
+				-- actions may be relevant
+				if(o.actions) then
+					for a_id, a in pairs(o.actions) do
+						if(a and a.a_on_failure
+						  and a.a_on_failure == this_dialog) then
+							table.insert(found, {d_id, o_id, a_id,
+								"action failed"})
+						end
+					end
+				end
+			end
+		end
+	end
+
+	local formspec = {
+		"formspec_version[3]",
+		"size[20,8]",
+		-- back to the list with that one precondition or effect
+		"button[0.2,0.2;19.4,0.6;back;Back to dialog "..minetest.formspec_escape(this_dialog).."]",
+		"button[0.2,7.2;19.4,0.6;back;Back to dialog "..minetest.formspec_escape(this_dialog).."]",
+		"label[0.2,1.1;Dialog \""..minetest.formspec_escape(this_dialog).."\" "..
+			"is referenced here:]",
+		"tablecolumns[color,span=1;text;color,span=1;text]",
+		"table[1.2,1.4;17.6,5.5;table_of_dialog_uses;"
+	}
+	for i, v in ipairs(found) do
+		local a_or_e = ""
+		if(v[4] ~= "action failed") then
+			a_or_e = "effect"
+		else
+			a_or_e = "action"
+		end
+		table.insert(formspec, "#FFFFFF,"..
+			minetest.formspec_escape(
+				"Dialog \""..tostring(v[1]).."\", option \""..tostring(v[2])..
+				"\", "..tostring(a_or_e).." \""..tostring(v[3]).."\":")..
+			",#FFFFFF,"..minetest.formspec_escape(v[4])..",")
+	end
+	return table.concat(formspec, "").."]"
+end

functions.lua

@@ -1123,6 +1123,14 @@ yl_speak_up.get_fs_talkdialog = function(player, n_id, d_id, alternate_text)
 			"need to delete all options and its text first.]")
             end
 
+	    -- chat option: "Show what points to this dialog."
+	    h = h + 1
+            table.insert(formspec, "button[0.5," .. h .. ";53.8,0.9;show_what_points_to_this_dialog;]")
+            table.insert(formspec, "tooltip[show_what_points_to_this_dialog;"..
+			"Show which other dialog options or failed actions\n"..
+			"or effects lead the player to this dialog here.]")
+            table.insert(formspec, "label[0.7,"..(h+0.45)..";Show what points to this dialog.]")
+
 	    -- chat option: "Make this dialog the first one shown when starting to talk."
             h = h + 1
 	    if(active_dialog and active_dialog.d_sort and tonumber(active_dialog.d_sort) ~= 0) then
@@ -2203,6 +2211,16 @@ yl_speak_up.input_talk = function(player, formname, fields)
 		local result = yl_speak_up.edit_mode_apply_changes(pname, fields)
         end
 
+	-- show which dialogs point to this one
+	if(fields.show_what_points_to_this_dialog) then
+		local dialog = yl_speak_up.speak_to[pname].dialog
+		local d_id = yl_speak_up.speak_to[pname].d_id
+		-- TODO: use show_fs here
+		minetest.show_formspec(pname, "yl_speak_up:show_points_to_dialog",
+			yl_speak_up.show_what_points_to_this_dialog(player, pname, dialog, d_id))
+		return
+	end
+
 	-- the player wants to change name and description; show the formspec
 	if(edit_mode and fields.button_edit_name_and_description) then
 		-- this is not the initial config - but the same formspec can be used