added tiled wallpaper module

module/init.lua

@@ -1,3 +1,4 @@
 return {
-    window_swallowing = require("bling.module.window_swallowing")
+    window_swallowing = require("bling.module.window_swallowing"),
+    tiled_wallpaper   = require("bling.module.tiled_wallpaper")
 }

module/tiled_wallpaper.lua

@@ -0,0 +1,58 @@
+--[[
+    This module makes use of cairo surfaces
+    For documentation take a look at the C docs:
+    https://www.cairographics.org/
+    They can be applied to lua by changing the naming conventions
+    and adjusting for the missing namespaces (and classes)
+    for example:
+    cairo_rectangle(cr, 1, 1, 1, 1) in C would be written as 
+    cr:rectangle(1, 1, 1, 1) in lua
+    and 
+    cairo_fill(cr) in C would be written as 
+    cr:fill() in lua
+--]]
+
+local cairo = require("lgi").cairo
+local gears = require("gears")
+
+function create_tiled_wallpaper(str, s, args_table)
+
+    -- user input
+    args_table = args_table or {}
+    local fg = args_table.fg or "#ff0000"
+    local bg = args_table.bg or "#00ffff"
+    local offset_x = args_table.offset_x
+    local offset_y = args_table.offset_y
+    local font = args_table.font or "Hack"
+    local font_size = tonumber(args_table.font_size) or 16
+    local zickzack_bool = args_table.zickzack or false
+    local padding = args_table.padding or 100
+    
+    -- create cairo image wallpaper
+    local img = cairo.ImageSurface(cairo.Format.RGB24, padding, padding)
+    cr = cairo.Context(img)
+
+    cr:set_source(gears.color(bg))
+    cr:paint()
+
+    cr:set_source(gears.color(fg))
+
+    cr:set_font_size(font_size)
+    cr:select_font_face(font)
+
+    if zickzack_bool then 
+        cr:set_source(gears.color(fg))
+        cr:move_to(padding/2 + font_size, padding/2 + font_size)
+        cr:show_text(str)
+    end 
+    
+    cr:set_source(gears.color(fg))
+    cr:move_to(font_size, font_size)
+    cr:show_text(str)
+    
+    -- tile cairo image
+    gears.wallpaper.tiled(img, s, {x=offset_x, y=offset_y})
+end 
+
+return create_tiled_wallpaper
+