add img to babycode

lib/babycode.lua

@@ -96,6 +96,13 @@ function babycode.to_html(s, escape_html)
     return "<ol>" .. get_list_items(list_body, escape_html) .. "</ol>"
   end)
   
+  -- images
+  local images = {}
+  text = text:gsub("%[img=(.-)%](.-)%[/img%]", function (img, alt)
+    table.insert(images, {img = img, alt = alt})
+    return "\1IMG:"..#images.."\1"
+  end)
+  
   -- normalize newlines, attempt #4
   text = text:gsub("  +%s*\r?\n", "<br>")
   text = text:gsub("(%S)(\r?\n\r?\n)\r?\n*", "%1<br><br>")
@@ -131,6 +138,11 @@ function babycode.to_html(s, escape_html)
   -- rule
   text = text:gsub("\n+%-%-%-", "<hr>")
 
+  -- <div class=\"post-img-container\"><img src=%1 alt=%2></div>
+  text = text:gsub("\1IMG:(%d+)\1", function (n)
+    local img = images[tonumber(n)]
+    return ("<div class=\"block-img-container\"><img class=\"block-img\" src=\"%s\" alt=\"%s\"></div>"):format(img.img, img.alt)
+  end)
   -- replace code block placeholders back with their original contents
   text = text:gsub("\1CODE:(%d+)\1", function(n)
     local code = code_blocks[tonumber(n)]