Add reveal example

doc.lua

@@ -43,14 +43,28 @@ doc.new_category("example_hide", {
 })
 
 -- This entry will start hidden. The user will not see it until it gets
--- revealed by using doc.mark_entry_as_revealed.
+-- revealed by using doc.mark_entry_as_revealed. Note that you should
--- TODO: Add example for that, too.
+-- NOT hide entries if there is no way for the player to reveal them.
 doc.new_entry("example_hide", "hidden", {
 	name = "Hidden Entry",
 	hidden = true,
 	data = "This entry is hidden.",
 })
 
+-- This chat command demonstrates how to use `doc.mark_entry_as_revealed`.
+minetest.register_chatcommand("doc_example_reveal", {
+	param = "",
+	description = "Reveal the hidden entry of the doc_example mod",
+	privs = {},
+	func = function(playername, params)
+		-- This reveals the previously created entry
+		doc.mark_entry_as_revealed(playername, "example_hide", "hidden")
+		minetest.chat_send_player(playername, "The hidden doc_example entry has been revealed! Look into the category “Example Hidden” to see it.")
+	end,
+})
+--[[ In actual game, you would probably want to invent more engaging ways to
+reveal entries. ;-) ]]
+
 -------------------------------------------------------------------------------
 --[[ A simple category with 3 entries: Cities.
 Now we're getting somewhere! This time, we define a custom build_formspec