Added conversion from svg to png, and fixed some minor bugs

internet.lua

@@ -77,7 +77,7 @@ local function search_wikipedia_for_images (topics, language, topic_to_image_url
 
     -- Determine topic to image
     for _, page in pairs(data.query.pages) do
-        local orig_title  =  redirected_topics[ page.title ]
+        local orig_title  =  redirected_topics[ page.title ] or page.title
         if not topic_to_image_url[orig_title] then
             local found_url  = false
             if page.original then  found_url  =  page.original.source  end

main.lua

@@ -127,6 +127,7 @@ local function fill_in_topics_information (topics)
         assert(type(topic) == 'string')
 
         local url = topic_to_image_url[topic]
+        print(topic, url)
 
         if url then  new_topics[i]  =  { topic = topic, type = 'image', url = url }
         else         new_topics[i]  =  { topic = topic, type = 'text', text = topic }
@@ -141,9 +142,19 @@ local function paste_topic_onto_image (target, topic, x, y, w, h, bg_color, font
     assert(type(font_name) == 'string')
     -- Download and paste found image
     if topic.type == 'image' then
-        local url, filename  =  topic.url, CONFIG.IMGGEN_PATH_OUTPUT..'topic_'..topic.topic..'.png'
+        local file_extension =  topic.url:match '%.(%a+)$'
+        local url, filename  =  topic.url, CONFIG.IMGGEN_PATH_OUTPUT..'topic_'..topic.topic..'.'..file_extension
+        assert(type(url) == 'string' and #url > 0)
+        assert(type(filename) == 'string' and #filename > 0)
         internet.download_file(url, filename)
-        local found_img  =  imlib.image.load(filename)
+        -- Convert svg to png
+        if url:match '%.svg$' then
+            local filename_2 = CONFIG.IMGGEN_PATH_OUTPUT..'topic_'..topic.topic..'.'..'png'
+            os.execute('convert -density 1200 -resize 400x400 '..filename..' '..filename_2)
+            filename = filename_2
+        end
+        --
+        local found_img  =  assert(imlib.image.load(filename))
         found_img:crop_and_scale(0, 0, found_img:get_width(), found_img:get_height(), w, h)
         flatten_onto (target, found_img, x, y)
         found_img:free()