1 files changed, 111 insertions, 0 deletions
diff --git a/advtrains/formspec.lua b/advtrains/formspec.lua
new file mode 100644
index 0000000..8894354
--- /dev/null
+++ b/advtrains/formspec.lua
@@ -0,0 +1,111 @@
+local sformat = string.format
+local fsescape = minetest.formspec_escape
+
+local function make_list(entries)
+	local t = {}
+	for k, v in ipairs(entries) do
+		t[k] = fsescape(v)
+	end
+	return table.concat(t, ",")
+end
+
+local function S_wrapper(f, i0)
+	return function(...)
+		local args = {...}
+		args[i0] = attrans(unpack(args,i0))
+		return f(unpack(args,1,i0))
+	end
+end
+
+local function f_button(x, y, w, id, text)
+	return sformat("button[%f,%f;%f,0.75;%s;%s]", x, y, w, id, text)
+end
+
+local function f_checkbox(x, y, name, selected, label)
+	return sformat("checkbox[%f,%f;%s;%s;%s]", x, y+0.25, name, label, selected and "true" or "false")
+end
+
+local function f_button_exit(x, y, w, id, text)
+	return sformat("button_exit[%f,%f;%f,0.75;%s;%s]", x, y, w, id, text)
+end
+
+local function f_dropdown(x, y, w, id, entries, sel, indexed)
+	return sformat("dropdown[%f,%f;%f,0.75;%s;%s;%d%s]",
+		x, y, w, id, make_list(entries),
+		sel or 1,
+		indexed and ";true" or "")
+end
+
+local function f_image_button(x, y, w, h, texture, id, label, noclip, drawborder, pressed)
+	local st = {string.format("%f,%f;%f,%f;%s;%s;%s", x, y, w, h, fsescape(texture), fsescape(id), fsescape(label))}
+	if pressed then
+		st[#st+1] = tostring(noclip or false)
+		st[#st+1] = tostring(drawborder or false)
+		st[#st+1] = fsescape(pressed)
+	end
+	return sformat("image_button[%s]", table.concat(st, ";"))
+end
+
+local function f_image_button_exit(x, y, w, h, texture, id, label)
+	local st = {string.format("%f,%f;%f,%f;%s;%s;%s", x, y, w, h, fsescape(texture), fsescape(id), fsescape(label))}
+	return sformat("image_button_exit[%s]", table.concat(st, ";"))
+end
+
+local function f_label(x, y, text)
+	return sformat("label[%f,%f;%s]", x, y+0.25, fsescape(text))
+end
+
+local function f_field_aux(x, y, w, id, default)
+	return sformat("field[%f,%f;%f,0.75;%s;;%s]", x, y, w, id, default)
+end
+
+local function f_field(x, y, w, id, label, default)
+	return f_label(x, y-0.5, label) .. f_field_aux(x, y, w, id, default)
+end
+
+local function f_tabheader(x, y, w, h, id, entries, sel, transparent, border)
+	local st = {string.format("%f,%f",x, y)}
+	if h then
+		if w then
+			st[#st+1] = string.format("%f,%f", w, h)
+		else
+			st[#st+1] = tostring(h)
+		end
+	end
+	st[#st+1] = tostring(id)
+	st[#st+1] = make_list(entries)
+	st[#st+1] = tostring(sel)
+	if transparent ~= nil then
+		st[#st+1] = tostring(transparent)
+		if border ~= nil then
+			st[#st+1] = tostring(border)
+		end
+	end
+	return string.format("tabheader[%s]", table.concat(st, ";"))
+end
+
+local function f_textlist(x, y, w, h, id, entries, sel, transparent)
+	local st = {string.format("%f,%f;%f,%f;%s;%s", x, y, w, h, id, make_list(entries))}
+	if sel then
+		st[#st+1] = tostring(sel)
+		st[#st+1] = tostring(transparent or false)
+	end
+	return string.format("textlist[%s]", table.concat(st, ";"))
+end
+
+return {
+	button = f_button,
+	S_button = S_wrapper(f_button, 5),
+	checkbox = f_checkbox,
+	S_checkbox = S_wrapper(f_checkbox, 5),
+	button_exit = f_button_exit,
+	S_button_exit = S_wrapper(f_button_exit, 5),
+	dropdown = f_dropdown,
+	field = f_field,
+	image_button = f_image_button,
+	image_button_exit = f_image_button_exit,
+	label = f_label,
+	S_label = S_wrapper(f_label, 3),
+	tabheader = f_tabheader,
+	textlist = f_textlist,
+}