Add support for dropped items + support for URL fetched recipes +

bugfixes

.luacheckrc

@@ -9,6 +9,7 @@ read_globals = {
 	"vector",
 	"string",
 	"table",
+	"ItemStack",
 }
 
 globals = {

API.md

@@ -35,7 +35,7 @@ craftguide.register_craft({
 })
 ```
 
-Recipes can also be registered in a Minecraft-like way:
+Recipes can be registered in a Minecraft-like way:
 
 ```Lua
 craftguide.register_craft({
@@ -53,6 +53,47 @@ craftguide.register_craft({
 })
 ```
 
+Multiples recipes can also be registered:
+
+```Lua
+craftguide.register_craft({
+	{
+		result = "default:mese",
+		items = {
+			"default:mese_crystal, default:mese_crystal",
+			"default:mese_crystal, default:mese_crystal",
+		}
+	},
+
+	{
+		result = "default:mese 2",
+		items = {
+			"default:mese_crystal, default:mese_crystal",
+			"default:mese_crystal, default:mese_crystal",
+			"default:mese_crystal, default:mese_crystal",
+		}
+	},
+
+	big = {
+		result = "default:mese 4",
+		items = {
+			"default:mese_crystal, default:mese_crystal",
+			"default:mese_crystal, default:mese_crystal",
+			"default:mese_crystal, default:mese_crystal",
+			"default:mese_crystal, default:mese_crystal",
+		}
+	},
+})
+```
+
+Recipes can be registered via an URL (HTTP support is required¹):
+
+```Lua
+craftguide.register_craft({
+	url = https://raw.githubusercontent.com/minetest-mods/craftguide/master/test.json
+})
+```
+
 ---
 
 ### Recipe filters
@@ -168,3 +209,12 @@ You can add a stereotype like so:
 ```Lua
 craftguide.group_stereotypes.radioactive = "mod:item"
 ```
+
+#### `craftguide.http_post_data`
+
+If set, the mod will export all the cached recipes and usages in a JSON format
+to the given URL (HTTP support is required¹).
+
+---
+
+**¹** Add `craftguide` to the `secure.http_mods` or `secure.trusted_mods` setting in `minetest.conf`.

README.md

@@ -19,4 +19,4 @@ For developers, `craftguide` also has a [modding API](https://github.com/minetes
 Love this mod? Donations are appreciated: https://www.paypal.me/jpg84240
 
 
-![Preview2](https://i.imgur.com/GVQvufb.png)
+![Preview2](https://i.imgur.com/w7KMS9G.png)

init.lua

@@ -20,16 +20,17 @@ local toolrepair
 local progressive_mode = core.settings:get_bool("craftguide_progressive_mode")
 local sfinv_only = core.settings:get_bool("craftguide_sfinv_only") and rawget(_G, "sfinv")
 
+local http = core.request_http_api()
+
 local reg_items = core.registered_items
-local reg_nodes = core.registered_nodes
 local reg_tools = core.registered_tools
-local reg_entities = core.registered_nodes
 local reg_aliases = core.registered_aliases
-local reg_craftitems = core.registered_craftitems
 
 local log = core.log
 local after = core.after
 local clr = core.colorize
+local parse_json = core.parse_json
+local write_json = core.write_json
 local chat_send = core.chat_send_player
 local show_formspec = core.show_formspec
 local globalstep = core.register_globalstep
@@ -77,16 +78,17 @@ local XOFFSET = sfinv_only and 3.83 or 11.2
 local YOFFSET = sfinv_only and 6 or 1
 
 local PNG = {
-	bg      = "craftguide_bg.png",
-	bg_full = "craftguide_bg_full.png",
-	search  = "craftguide_search_icon.png",
-	clear   = "craftguide_clear_icon.png",
-	prev    = "craftguide_next_icon.png^\\[transformFX",
-	next    = "craftguide_next_icon.png",
-	arrow   = "craftguide_arrow.png",
-	fire    = "craftguide_fire.png",
-	book    = "craftguide_book.png",
-	sign    = "craftguide_sign.png",
+	bg       = "craftguide_bg.png",
+	bg_full  = "craftguide_bg_full.png",
+	search   = "craftguide_search_icon.png",
+	clear    = "craftguide_clear_icon.png",
+	prev     = "craftguide_next_icon.png^\\[transformFX",
+	next     = "craftguide_next_icon.png",
+	arrow    = "craftguide_arrow.png",
+	fire     = "craftguide_fire.png",
+	book     = "craftguide_book.png",
+	sign     = "craftguide_sign.png",
+	selected = "craftguide_selected.png",
 }
 
 local FMT = {
@@ -98,6 +100,7 @@ local FMT = {
 	item_image = "item_image[%f,%f;%f,%f;%s]",
 	image_button = "image_button[%f,%f;%f,%f;%s;%s;%s]",
 	item_image_button = "item_image_button[%f,%f;%f,%f;%s;%s;%s]",
+	arrow = "image_button[%f,%f;0.8,0.8;%s;%s;;;false;%s^\\[colorize:yellow:255]",
 }
 
 craftguide.group_stereotypes = {
@@ -118,12 +121,13 @@ local function msg(name, str)
 	return chat_send(name, fmt("[craftguide] %s", clr("#FFFF00", str)))
 end
 
-local function clean_str(str)
-	return match(str, "%S*")
-end
 
 local function is_str(x)
-	return type(x) == "string" and clean_str(x)
+	return type(x) == "string"
+end
+
+local function true_str(str)
+	return is_str(str) and str ~= ""
 end
 
 local function is_table(x)
@@ -178,26 +182,25 @@ local function table_eq(T1, T2)
 		end
 
 		avoid_loops[t1] = t2
-		local t2keys = {}
-		local t2tablekeys = {}
+		local t2k, t2kv = {}, {}
 
 		for k in pairs(t2) do
-			if type(k) == "table" then
-				insert(t2tablekeys, k)
+			if is_table(k) then
+				insert(t2kv, k)
 			end
 
-			t2keys[k] = true
+			t2k[k] = true
 		end
 
 		for k1, v1 in pairs(t1) do
 			local v2 = t2[k1]
 			if type(k1) == "table" then
 				local ok
-				for i = 1, #t2tablekeys do
-					local tk = t2tablekeys[i]
+				for i = 1, #t2kv do
+					local tk = t2kv[i]
 					if table_eq(k1, tk) and recurse(v1, t2[tk]) then
-						remove(t2tablekeys, i)
-						t2keys[tk] = nil
+						remove(t2kv, i)
+						t2k[tk] = nil
 						ok = true
 						break
 					end
@@ -206,12 +209,12 @@ local function table_eq(T1, T2)
 				if not ok then return end
 			else
 				if v2 == nil then return end
-				t2keys[k1] = nil
+				t2k[k1] = nil
 				if not recurse(v1, v2) then return end
 			end
 		end
 
-		if next(t2keys) then return end
+		if next(t2k) then return end
 		return true
 	end
 
@@ -249,7 +252,7 @@ end
 local craft_types = {}
 
 function craftguide.register_craft_type(name, def)
-	if not is_str(name) then
+	if not true_str(name) then
 		return err("craftguide.register_craft_type(): name missing")
 	end
 
@@ -265,19 +268,43 @@ function craftguide.register_craft_type(name, def)
 end
 
 function craftguide.register_craft(def)
-	def.custom = true
-	def.width = 0
-	local c = 0
+	local width, c = 0, 0
+
+	if true_str(def.url) then
+		if not http then
+			return err("No HTTP support for this mod. " ..
+				"Add it to the `secure.http_mods` or `secure.trusted_mods` setting.")
+		end
+
+		http.fetch({url = def.url}, function(result)
+			if result.succeeded then
+				local t = parse_json(result.data)
+				if is_table(t) then
+					return craftguide.register_craft(t)
+				end
+			end
+		end)
+
+		return
+	end
 
 	if not is_table(def) or not next(def) then
 		return err("craftguide.register_craft(): craft definition missing")
 	end
 
-	if def.result then
-		def.output = def.result -- Backward compatibility
+	if #def > 1 then
+		for _, v in pairs(def) do
+			craftguide.register_craft(v)
+		end
+		return
 	end
 
-	if not is_str(def.output) then
+	if def.result then
+		def.output = def.result -- Backward compatibility
+		def.result = nil
+	end
+
+	if not true_str(def.output) then
 		return err("craftguide.register_craft(): output missing")
 	end
 
@@ -299,10 +326,10 @@ function craftguide.register_craft(def)
 			return #a > #b
 		end)
 
-		def.width = #cp[1]
+		width = #cp[1]
 
 		for i = 1, #def.grid do
-			while #def.grid[i] < def.width do
+			while #def.grid[i] < width do
 				def.grid[i] = def.grid[i] .. " "
 			end
 		end
@@ -319,32 +346,35 @@ function craftguide.register_craft(def)
 			items[i] = items[i]:gsub(",", ", ")
 			local rlen = #split(items[i], ",")
 
-			if rlen > def.width then
-				def.width = rlen
+			if rlen > width then
+				width = rlen
 			end
 		end
 
 		for i = 1, len do
-			while #split(items[i], ",") < def.width do
+			while #split(items[i], ",") < width do
 				items[i] = items[i] .. ", "
 			end
 		end
 
 		for name in gmatch(concat(items, ","), "[%s%w_:]+") do
 			c = c + 1
-			def.items[c] = clean_str(name)
+			def.items[c] = match(name, "%S+")
 		end
 	end
 
-	local output = clean_str(def.output)
+	local output = match(def.output, "%S+")
 	recipes_cache[output] = recipes_cache[output] or {}
+
+	def.custom = true
+	def.width = width
 	insert(recipes_cache[output], def)
 end
 
 local recipe_filters = {}
 
 function craftguide.add_recipe_filter(name, f)
-	if not is_str(name) then
+	if not true_str(name) then
 		return err("craftguide.add_recipe_filter(): name missing")
 	elseif not is_func(f) then
 		return err("craftguide.add_recipe_filter(): function missing")
@@ -382,7 +412,7 @@ end
 local search_filters = {}
 
 function craftguide.add_search_filter(name, f)
-	if not is_str(name) then
+	if not true_str(name) then
 		return err("craftguide.add_search_filter(): name missing")
 	elseif not is_func(f) then
 		return err("craftguide.add_search_filter(): function missing")
@@ -538,10 +568,12 @@ local function get_recipes(item, data, player)
 
 	if not sfinv_only or (sfinv_only and data.show_usages) then
 		usages = apply_recipe_filters(usages, player)
-		if usages and #usages == 0 then return end
 	end
 
-	return recipes, usages
+	local no_usages = not usages or #usages == 0
+
+	return not no_recipes and recipes or nil,
+	       not no_usages  and usages or nil
 end
 
 local function groups_to_items(groups, get_all)
@@ -628,6 +660,11 @@ local function get_tooltip(item, info)
 		tooltip = add(S("Repairable by step of @1", clr("yellow", toolrepair .. "%")))
 	end
 
+	if info.rarity then
+		local chance = (1 / info.rarity) * 100
+		tooltip = add(S("@1 of chance to drop", clr("yellow", chance .. "%")))
+	end
+
 	return fmt("tooltip[%s;%s]", item, ESC(tooltip))
 end
 
@@ -655,7 +692,7 @@ local function get_output_fs(fs, L)
 		end
 	end
 
-	local arrow_X = L.rightest + (L.s_btn_size or 1.1)
+	local arrow_X = L.rightest + (L._btn_size or 1.1)
 	local output_X = arrow_X + 0.9
 
 	fs[#fs + 1] = fmt(FMT.image,
@@ -668,27 +705,29 @@ local function get_output_fs(fs, L)
 			1.1, 1.1, PNG.fire)
 	else
 		local item = L.recipe.output
-		local name = clean_str(item)
+		local name = match(item, "%S*")
 
 		fs[#fs + 1] = fmt(FMT.item_image_button,
 			output_X, YOFFSET + (sfinv_only and 0.7 or 0) + L.spacing,
 			1.1, 1.1, item, ESC(name), "")
 
-		fs[#fs + 1] = fmt(FMT.image,
-			output_X, YOFFSET + (sfinv_only and 0.7 or 0) + L.spacing,
-			1.1, 1.1, "craftguide_selected.png")
-
-		local burntime = fuel_cache[name]
-		local repair = repairable(name)
-
-		if burntime or repair then
-			fs[#fs + 1] = get_tooltip(name, {
-				burntime = burntime,
-				repair = repair,
-			})
+		if CORE_VERSION >= 510 then
+			fs[#fs + 1] = fmt(FMT.image,
+				output_X, YOFFSET + (sfinv_only and 0.7 or 0) + L.spacing,
+				1.1, 1.1, PNG.selected)
 		end
 
-		if burntime then
+		local infos = {
+			burntime = fuel_cache[name],
+			repair   = repairable(name),
+			rarity   = L.rarity,
+		}
+
+		if next(infos) then
+			fs[#fs + 1] = get_tooltip(name, infos)
+		end
+
+		if infos.burntime then
 			fs[#fs + 1] = fmt(FMT.image,
 				output_X + 1, YOFFSET + (sfinv_only and 0.7 or 0.1) + L.spacing,
 				0.6, 0.4, PNG.arrow)
@@ -700,89 +739,134 @@ local function get_output_fs(fs, L)
 	end
 end
 
-local function pretty_wrap(str, limit)
-	return #str > limit + 3 and sub(str, 1, limit) .. "..." or str
-end
+local function get_grid_fs(fs, rcp, spacing)
+	if not rcp then return end
+	local width = rcp.width or 1
+	local replacements = rcp.replacements
+	local rarity = rcp.rarity
+	local rightest, btn_size, _btn_size = 0, 1.1
+	local cooktime, shapeless
 
-local function get_itemdef_fs(fs, L)
-	fs[#fs + 1] = CORE_VERSION >= 510 and
-		fmt("background9[8.1,%f;6.6,2.19;%s;false;%d]",
-			L.y, PNG.bg_full, 10) or
-		fmt("background[8.1,%f;6.6,2.19;%s;false]", L.y, PNG.bg_full)
-
-	local def = reg_items[L.item]
-	local namestr = fmt("%s (%s)", pretty_wrap(get_desc(L.item), 25), L.item)
-
-	local typestr
-	if reg_nodes[L.item] then
-		typestr = fmt("%s (%s)", ESC(S("Node")), def.drawtype)
-	elseif reg_entities[L.item] then
-		typestr = ESC(S("Entity"))
-	elseif reg_craftitems[L.item] then
-		typestr = ESC(S("Craftitem"))
-	elseif reg_tools[L.item] then
-		typestr = ESC(S("Tool"))
+	if rcp.type == "cooking" then
+		cooktime, width = width, 1
+	elseif width == 0 and not rcp.custom then
+		shapeless = true
+		local n = #rcp.items
+		width = (n < 5 and n > 1) and 2 or min(3, max(1, n))
 	end
 
-	local groupstr
-	for k, v in pairs(def.groups or {}) do
-		groupstr = (groupstr or "") .. fmt("%s(%d), ", pretty_wrap(k, 13), v)
-	end
-	groupstr = groupstr and sub(groupstr, 1, -3)
+	local rows = ceil(maxn(rcp.items) / width)
 
-	local specs = {
-		ESC(S("Name")),
-		ESC(S("Type")),
-		ESC(S("Groups")),
-	}
+	if width > WH_LIMIT or rows > WH_LIMIT then
+		fs[#fs + 1] = fmt(FMT.label,
+			XOFFSET + (sfinv_only and -1.5 or -1.6),
+			YOFFSET + (sfinv_only and 0.5 or spacing),
+			ESC(S("Recipe's too big to be displayed (@1x@2)", width, rows)))
 
-	local tstr = ""
-	for i = 1, #specs do
-		tstr = tstr .. "#6389FF," .. specs[i] .. ",#FFFFFF,%s,"
-	end
-	tstr = sub(tstr, 1, -2)
-
-	fs[#fs + 1] = [[
-		tableoptions[background=#00000000;highlight=#00000000;border=false]
-		tablecolumns[color;text]
-	]]
-
-	fs[#fs + 1] = fmt("table[8.1,%f;6.3,1.8;itemdef;" .. tstr .. ";0]",
-		L.y + 0.08,
-		namestr,
-		ESC(typestr or S("Unknown")),
-		ESC(groupstr or S("None")))
-end
-
-local function get_info_fs(data, fs)
-	local t = {recipes = data.recipes, usages = data.usages}
-	local infonum = 0
-	local last_y
-
-	if sfinv_only then
-		t = data.show_usages and {usages = data.usages} or {recipes = data.recipes}
+		return concat(fs)
 	end
 
-	for k, v in pairs(t) do
-		infonum = infonum + 1
-		local spacing = (infonum - 1) * 3.6
-		last_y = -0.2 + infonum * 3.6
+	local large_recipe = width > 3 or rows > 3
 
-		local rcp = k == "recipes" and v[data.rnum] or v[data.unum]
-		local width = rcp.width or 1
-		local replacements = rcp.replacements
-		local cooktime, shapeless
+	if large_recipe then
+		fs[#fs + 1] = "style_type[item_image_button;border=true]"
+	end
 
-		if rcp.type == "cooking" then
-			cooktime, width = width, 1
-		elseif width == 0 and not rcp.custom then
-			shapeless = true
-			local n = #rcp.items
-			width = (n < 5 and n > 1) and 2 or min(3, max(1, n))
+	for i = 1, width * rows do
+		local item = rcp.items[i] or ""
+		local X = ceil((i - 1) % width - width) + XOFFSET
+		local Y = ceil(i / width) + YOFFSET - min(2, rows) + spacing
+
+		if large_recipe then
+			local xof = 1 - 4 / width
+			local yof = 1 - 4 / rows
+			local x_y = width > rows and xof or yof
+
+			btn_size = width > rows and
+				(3.5 + (xof * 2)) / width or (3.5 + (yof * 2)) / rows
+			_btn_size = btn_size
+
+			X = (btn_size * ((i - 1) % width) + XOFFSET -
+				(sfinv_only and 2.83 or 0.5)) * (0.83 - (x_y / 5))
+			Y = (btn_size * floor((i - 1) / width) +
+				(sfinv_only and 5.81 or 5.5) + x_y) * (0.86 - (x_y / 5))
 		end
 
-		local rows = ceil(maxn(rcp.items) / width)
-		local rightest, btn_size, s_btn_size = 0, 1.1
+		if X > rightest then
+			rightest = X
+		end
+
+		local groups
+
+		if is_group(item) then
+			groups = extract_groups(item)
+			local items = groups_to_items(groups)
+			item = items[1] or items
+		end
+
+		local label = groups and "\nG" or ""
+		local replace
+
+		if replacements then
+			for j = 1, #replacements do
+				local replacement = replacements[j]
+				if replacement[1] == item then
+					label = "\nR"
+					replace = replacement[2]
+				end
+			end
+		end
+
+		fs[#fs + 1] = fmt(FMT.item_image_button,
+			X, Y + (sfinv_only and 0.7 or 0),
+			btn_size, btn_size, item, match(item, "%S*"), ESC(label))
+
+		local infos = {
+			unknown  = reg_items[item] and nil,
+			groups   = groups,
+			burntime = fuel_cache[item],
+			cooktime = cooktime,
+			replace  = replace,
+		}
+
+		if next(infos) then
+			fs[#fs + 1] = get_tooltip(item, infos)
+		end
+
+		if CORE_VERSION >= 510 and not large_recipe then
+			fs[#fs + 1] = fmt(FMT.image,
+				X, Y + (sfinv_only and 0.7 or 0),
+				btn_size, btn_size, PNG.selected)
+		end
+	end
+
+	if large_recipe then
+		fs[#fs + 1] = "style_type[item_image_button;border=false]"
+	end
+
+	get_output_fs(fs, {
+		recipe    = rcp,
+		shapeless = shapeless,
+		rightest  = rightest,
+		btn_size  = btn_size,
+		_btn_size = _btn_size,
+		spacing   = spacing,
+		rarity    = rarity,
+	})
+end
+
+local function get_panels(data, fs)
+	local panels = {recipes = data.recipes or {}, usages = data.usages or {}}
+	local x = 0.33
+
+	if sfinv_only then
+		panels = data.show_usages and
+			{usages = data.usages} or {recipes = data.recipes}
+	end
+
+	for k, v in pairs(panels) do
+		x = x + 1
+		local spacing = (x - 1) * 3.6
 
 		if not sfinv_only then
 			fs[#fs + 1] = CORE_VERSION >= 510 and
@@ -794,128 +878,42 @@ local function get_info_fs(data, fs)
 
 		local btn_lab
 
-		if (not sfinv_only and k == "recipes") or
+		if not sfinv_only and #v == 0 then
+			btn_lab = clr("red", k == "recipes" and
+				ESC(S("No recipes")) or ESC(S("No usages")))
+
+		elseif (not sfinv_only and k == "recipes") or
 				(sfinv_only and not data.show_usages) then
 			btn_lab = ESC(S("Recipe @1 of @2", data.rnum, #v))
+
 		elseif not sfinv_only or (sfinv_only and data.show_usages) then
 			btn_lab = ESC(S("Usage @1 of @2", data.unum, #v))
-		end
 
-		if sfinv_only then
+		elseif sfinv_only then
 			btn_lab = data.show_usages and
-				ESC(S("Usage @1 of @2", data.rnum, #v)) or
+				ESC(S("Usage @1 of @2", data.unum, #v)) or
 				ESC(S("Recipe @1 of @2", data.rnum, #v))
 		end
 
-		fs[#fs + 1] = fmt(FMT.button,
-			XOFFSET + (sfinv_only and 1.98 or 1.12),
-			YOFFSET + (sfinv_only and 1.9 or 1.2 + spacing),
-			2.2, 1, "alternate_" .. (k == "recipes" and "recipe" or "usage"), btn_lab)
+		fs[#fs + 1] = fmt(FMT.label,
+			XOFFSET + (sfinv_only and 2.3 or 1.6),
+			YOFFSET + (sfinv_only and 2.2 or 1.5 + spacing),
+			btn_lab)
 
-		if width > WH_LIMIT or rows > WH_LIMIT then
-			fs[#fs + 1] = fmt(FMT.label,
-				sfinv_only and 2 or 3, 7,
-				ESC(S("Recipe's too big to be displayed (@1x@2)", width, rows)))
+		if #v > 1 then
+			local btn_suffix = k == "recipes" and "recipe" or "usage"
+			local x_arrow = XOFFSET + (sfinv_only and 1.7 or 1)
+			local y_arrow = YOFFSET + (sfinv_only and 2.1 or 1.4 + spacing)
 
-			return concat(fs)
+			fs[#fs + 1] = fmt(FMT.arrow .. FMT.arrow,
+				x_arrow, y_arrow, PNG.prev,
+					fmt("prev_%s", btn_suffix), PNG.prev,
+				x_arrow + 1.8, y_arrow, PNG.next,
+					fmt("next_%s", btn_suffix), PNG.next)
 		end
 
-		local large_recipe = width > 3 or rows > 3
-
-		if large_recipe then
-			fs[#fs + 1] = "style_type[item_image_button;border=true]"
-		end
-
-		for i = 1, width * rows do
-			local item = rcp.items[i] or ""
-			local X = ceil((i - 1) % width - width) + XOFFSET
-			local Y = ceil(i / width) + YOFFSET - min(2, rows) + spacing
-
-			if large_recipe then
-				local xof = 1 - 4 / width
-				local yof = 1 - 4 / rows
-				local x_y = width > rows and xof or yof
-
-				btn_size = width > rows and
-					(3.5 + (xof * 2)) / width or (3.5 + (yof * 2)) / rows
-				s_btn_size = btn_size
-
-				X = (btn_size * ((i - 1) % width) + XOFFSET -
-					(sfinv_only and 2.83 or 0.5)) * (0.83 - (x_y / 5))
-				Y = (btn_size * floor((i - 1) / width) +
-					(sfinv_only and 5.81 or 4) + x_y) * (0.86 - (x_y / 5))
-			end
-
-			if X > rightest then
-				rightest = X
-			end
-
-			local groups
-
-			if is_group(item) then
-				groups = extract_groups(item)
-				local items = groups_to_items(groups)
-				item = items[1] or items
-			end
-
-			local label = groups and "\nG" or ""
-			local replace
-
-			if replacements then
-				for j = 1, #replacements do
-					local replacement = replacements[j]
-					if replacement[1] == item then
-						label = "\nR"
-						replace = replacement[2]
-					end
-				end
-			end
-
-			fs[#fs + 1] = fmt(FMT.item_image_button,
-				X, Y + (sfinv_only and 0.7 or 0),
-				btn_size, btn_size, item, clean_str(item), ESC(label))
-
-			local infos = {
-				unknown  = not reg_items[item],
-				groups   = groups,
-				burntime = fuel_cache[item],
-				cooktime = cooktime,
-				replace  = replace,
-			}
-
-			for _, info in pairs(infos) do
-				if info then
-					fs[#fs + 1] = get_tooltip(item, infos)
-					break
-				end
-			end
-
-			if not large_recipe then
-				fs[#fs + 1] = fmt(FMT.image,
-					X, Y + (sfinv_only and 0.7 or 0),
-					btn_size, btn_size, "craftguide_selected.png")
-			end
-		end
-
-		if large_recipe then
-			fs[#fs + 1] = "style_type[item_image_button;border=false]"
-		end
-
-		get_output_fs(fs, {
-			recipe     = rcp,
-			shapeless  = shapeless,
-			rightest   = rightest,
-			btn_size   = btn_size,
-			s_btn_size = s_btn_size,
-			spacing    = spacing,
-		})
-	end
-
-	if not sfinv_only then
-		get_itemdef_fs(fs, {
-			item = data.query_item,
-			y = last_y,
-		})
+		local rcp = k == "recipes" and v[data.rnum] or v[data.unum]
+		get_grid_fs(fs, rcp, spacing)
 	end
 end
 
@@ -955,14 +953,15 @@ local function make_formspec(name)
 		sfinv_only and 2.6 or 2.54, PNG.search, PNG.search,
 		sfinv_only and 3.3 or 3.25, PNG.clear, PNG.clear)
 
-	fs[#fs + 1] = fmt([[
-		image_button[%f,-0.05;0.8,0.8;%s;prev;;;false;%s^\[colorize:yellow:255]
-		label[%f,%f;%s / %u]
-		image_button[%f,-0.05;0.8,0.8;%s;next;;;false;%s^\[colorize:yellow:255]
-		]],
-		sfinv_only and 5.45 or (ROWS * 6.83) / 11, PNG.prev, PNG.prev,
-		sfinv_only and 6.35 or (ROWS * 7.85) / 11, 0.06, clr("yellow", data.pagenum), data.pagemax,
-		sfinv_only and 7.2  or (ROWS * 8.75) / 11, PNG.next, PNG.next)
+	fs[#fs + 1] = fmt("label[%f,%f;%s / %u]",
+		sfinv_only and 6.35 or (ROWS * 7.85) / 11,
+			0.06, clr("yellow", data.pagenum), data.pagemax)
+
+	fs[#fs + 1] = fmt(FMT.arrow .. FMT.arrow,
+		sfinv_only and 5.45 or (ROWS * 6.83) / 11,
+			-0.05, PNG.prev, "prev_page", PNG.prev,
+		sfinv_only and 7.2  or (ROWS * 8.75) / 11,
+			-0.05, PNG.next, "next_page", PNG.next)
 
 	if #data.items == 0 then
 		local no_item = S("No item to show")
@@ -990,16 +989,16 @@ local function make_formspec(name)
 			Y - (Y * 0.1) - 0.1,
 			1, 1, item, item)
 
-		if data.query_item == item then
+		if CORE_VERSION >= 510 and data.query_item == item then
 			fs[#fs + 1] = fmt(FMT.image,
 				X - (X * (sfinv_only and 0.12 or 0.14)) - 0.05,
 				Y - (Y * 0.1) - 0.1,
-				1, 1, "craftguide_selected.png")
+				1, 1, PNG.selected)
 		end
 	end
 
 	if (data.recipes and #data.recipes > 0) or (data.usages and #data.usages > 0) then
-		get_info_fs(data, fs)
+		get_panels(data, fs)
 	end
 
 	return concat(fs)
@@ -1028,6 +1027,16 @@ craftguide.add_search_filter("groups", function(item, groups)
 	return has_groups
 end)
 
+craftguide.register_craft_type("digging", {
+	description = ESC(S("Digging")),
+	icon = "default_tool_steelpick.png",
+})
+
+craftguide.register_craft_type("digging_chance", {
+	description = ESC(S("Digging Chance")),
+	icon = "default_tool_mesepick.png",
+})
+
 local function search(data)
 	local filter = data.filter
 
@@ -1102,9 +1111,9 @@ core.register_craft = function(def)
 		toolrepair = def.additional_wear * -100
 	end
 
-	local output = def.output or is_str(def.recipe)
+	local output = def.output or (true_str(def.recipe) and def.recipe) or nil
 	if not output then return end
-	output = {clean_str(output)}
+	output = {match(output, "%S+")}
 
 	local groups
 
@@ -1160,34 +1169,92 @@ core.register_craft = function(def)
 	end
 end
 
-local function show_item(def)
-	return not (def.groups.not_in_craft_guide == 1 or
-		def.groups.not_in_creative_inventory == 1) and
-		def.description and def.description ~= ""
-end
+local function handle_drops_table(name, drop)
+	-- Code borrowed and modified from unified_inventory
+	-- https://github.com/minetest-mods/unified_inventory/blob/master/api.lua
+	local drop_sure, drop_maybe = {}, {}
+	local drop_items = drop.items or {}
+	local max_items_left = drop.max_items
+	local max_start = true
 
-local function get_init_items()
-	local hash, c = {}, 0
-	for name, def in pairs(reg_items) do
-		if show_item(def) then
-			if not fuel_cache[name] then
-				cache_fuel(name)
-			end
+	for i = 1, #drop_items do
+		if max_items_left and max_items_left <= 0 then break end
+		local di = drop_items[i]
 
-			if not recipes_cache[name] then
-				cache_recipes(name)
-			end
+		for j = 1, #di.items do
+			local dstack = ItemStack(di.items[j])
+			local dname = dstack:get_name()
 
-			cache_usages(name)
+			if not dstack:is_empty() and dname ~= name then
+				local dcount = dstack:get_count()
 
-			if recipes_cache[name] or usages_cache[name] then
-				c = c + 1
-				init_items[c] = name
-				hash[name] = true
+				if #di.items == 1 and di.rarity == 1 and max_start then
+					if not drop_sure[dname] then
+						drop_sure[dname] = 0
+					end
+
+					drop_sure[dname] = drop_sure[dname] + dcount
+
+					if max_items_left then
+						max_items_left = max_items_left - 1
+						if max_items_left <= 0 then break end
+					end
+				else
+					if max_items_left then
+						max_start = false
+					end
+
+					if not drop_maybe[dname] then
+						drop_maybe[dname] = {}
+					end
+
+					if not drop_maybe[dname].output then
+						drop_maybe[dname].output = 0
+					end
+
+					drop_maybe[dname] = {
+						output = drop_maybe[dname].output + dcount,
+						rarity = di.rarity,
+					}
+				end
 			end
 		end
 	end
 
+	for item, count in pairs(drop_sure) do
+		craftguide.register_craft({
+			type = "digging",
+			items = {name},
+			output = fmt("%s %u", item, count),
+		})
+	end
+
+	for item, data in pairs(drop_maybe) do
+		craftguide.register_craft({
+			type = "digging_chance",
+			items = {name},
+			output = fmt("%s %u", item, data.output),
+			rarity = data.rarity,
+		})
+	end
+end
+
+local function register_drops(name, def)
+	local drop = def.drop
+	local dstack = ItemStack(drop)
+
+	if not dstack:is_empty() and dstack:get_name() ~= name then
+		craftguide.register_craft({
+			type = "digging",
+			items = {name},
+			output = drop,
+		})
+	elseif is_table(drop) then
+		handle_drops_table(name, drop)
+	end
+end
+
+local function handle_aliases(hash)
 	for oldname, newname in pairs(reg_aliases) do
 		local recipes = recipes_cache[oldname]
 		if recipes then
@@ -1218,12 +1285,54 @@ local function get_init_items()
 		end
 
 		if recipes_cache[oldname] and not hash[newname] then
-			c = c + 1
-			init_items[c] = newname
+			init_items[#init_items + 1] = newname
+		end
+	end
+end
+
+local function show_item(def)
+	return not (def.groups.not_in_craft_guide == 1 or
+		def.groups.not_in_creative_inventory == 1) and
+		def.description and def.description ~= ""
+end
+
+local function get_init_items()
+	local hash = {}
+	for name, def in pairs(reg_items) do
+		if show_item(def) then
+			if not fuel_cache[name] then
+				cache_fuel(name)
+			end
+
+			if not recipes_cache[name] then
+				cache_recipes(name)
+			end
+
+			cache_usages(name)
+			register_drops(name, def)
+
+			if recipes_cache[name] or usages_cache[name] then
+				init_items[#init_items + 1] = name
+				hash[name] = true
+			end
 		end
 	end
 
+	handle_aliases(hash)
 	sort(init_items)
+
+	if http and true_str(craftguide.http_post_data) then
+		local post_data = {
+			recipes = recipes_cache,
+			usages  = usages_cache,
+			fuel    = fuel_cache,
+		}
+
+		http.fetch_async({
+			url = craftguide.http_post_data,
+			post_data = write_json(post_data),
+		})
+	end
 end
 
 local function init_data(name)
@@ -1265,24 +1374,17 @@ local function fields(player, _f)
 
 	if _f.clear then
 		reset_data(data)
-		show_fs(player, name)
-		return true
+		return true, show_fs(player, name)
 
-	elseif _f.alternate_recipe then
-		if #data.recipes == 1 then return end
-		local num_next = data.rnum + 1
-		data.rnum = data.recipes[num_next] and num_next or 1
+	elseif _f.prev_recipe or _f.next_recipe then
+		local num = data.rnum + (_f.prev_recipe and -1 or 1)
+		data.rnum = data.recipes[num] and num or (_f.prev_recipe and #data.recipes or 1)
+		return true, show_fs(player, name)
 
-		show_fs(player, name)
-		return true
-
-	elseif _f.alternate_usage then
-		if #data.usages == 1 then return end
-		local num_next = data.unum + 1
-		data.unum = data.usages[num_next] and num_next or 1
-
-		show_fs(player, name)
-		return true
+	elseif _f.prev_usage or _f.next_usage then
+		local num = data.unum + (_f.prev_usage and -1 or 1)
+		data.unum = data.usages[num] and num or (_f.prev_usage and #data.usages or 1)
+		return true, show_fs(player, name)
 
 	elseif (_f.key_enter_field == "filter" or _f.search) and _f.filter ~= "" then
 		local str = lower(_f.filter)
@@ -1292,12 +1394,11 @@ local function fields(player, _f)
 		data.pagenum = 1
 		search(data)
 
-		show_fs(player, name)
-		return true
+		return true, show_fs(player, name)
 
-	elseif _f.prev or _f.next then
+	elseif _f.prev_page or _f.next_page then
 		if data.pagemax == 1 then return end
-		data.pagenum = data.pagenum - (_f.prev and 1 or -1)
+		data.pagenum = data.pagenum - (_f.prev_page and 1 or -1)
 
 		if data.pagenum > data.pagemax then
 			data.pagenum = 1
@@ -1305,8 +1406,7 @@ local function fields(player, _f)
 			data.pagenum = data.pagemax
 		end
 
-		show_fs(player, name)
-		return true
+		return true, show_fs(player, name)
 	else
 		local item
 		for field in pairs(_f) do
@@ -1339,8 +1439,7 @@ local function fields(player, _f)
 		data.rnum       = 1
 		data.unum       = 1
 
-		show_fs(player, name)
-		return true
+		return true, show_fs(player, name)
 	end
 end
 
@@ -1734,7 +1833,7 @@ on_leaveplayer(function(player)
 end)
 
 function craftguide.show(name, item, show_usages)
-	if not is_str(name) then
+	if not true_str(name)then
 		return err("craftguide.show(): player name missing")
 	end
 
@@ -1749,10 +1848,14 @@ function craftguide.show(name, item, show_usages)
 
 	if not recipes and not usages then
 		if not recipes_cache[item] and not usages_cache[item] then
-			return false, msg(name, S("No recipe or usage for this item"))
+			return false, msg(name, fmt("%s: %s",
+				S("No recipe or usage for this item"),
+				get_desc(item)))
 		end
 
-		return false, msg(name, S("You don't know a recipe or usage for this item"))
+		return false, msg(name, fmt("%s: %s",
+			S("You don't know a recipe or usage for this item"),
+			get_desc(item)))
 	end
 
 	data.query_item = item

locale/template

@@ -5,6 +5,8 @@ Crafting Guide=
 Crafting Guide Sign=
 Usage @1 of @2=
 Recipe @1 of @2=
+No recipes=
+No usages=
 Burning time: @1=
 Cooking time: @1=
 Replaced by @1 on smelting=
@@ -21,12 +23,6 @@ Show recipe(s) of the pointed node=
 No node pointed=
 You don't know a recipe or usage for this item=
 No recipe or usage for this item=
-Node=
-Entity=
-Craftitem=
-Tool=
-Name=
-Type=
-Groups=
-Unknown=
-None=
+Digging=
+Digging Chance=
+@1 of chance to drop=

test.json

@@ -0,0 +1,8 @@
+{
+	"items": [
+		"default:stone, default:stone, default:stone",
+		"default:stone,              , default:stone",
+		"default:stone, default:stone, default:stone"
+	],
+	"result": "default:cobble 16"
+}