fix nested quotes and alter linebreak parsing

lib/babycode.lua

@@ -22,25 +22,27 @@ function babycode.to_html(s, escape_html)
       return "\1CODE:"..#code_blocks.."\1"
     end
   end)
-
+  
+  text = text:gsub("  %s?\r?\n", "<br>")
+  -- normalize newlines
+  text = text:gsub("\r?\n\r?\n+", "<br>")
+  
   local url_tags = {}
   -- replace `[url=https://example.com]Example[/url] tags
   text = text:gsub("%[url=([^%]]+)%](.-)%[/url%]", function(url, label)
     table.insert(url_tags, {url = url, label = label})
     return "\1URL:"..#url_tags.."\1"
   end)
-  
-  -- replace `[url]https://example.com[/url] tags
-  -- text = text:gsub("%[url%]([^%]]+)%[/url%]", function(url)
-  --   return '<a href="'..url..'">'..url..'</a>'
-  -- end)
 
   -- bold, italics, strikethrough
   text = text:gsub("%[b%](.-)%[/b%]", "<strong>%1</strong>")
   text = text:gsub("%[i%](.-)%[/i%]", "<em>%1</em>")
   text = text:gsub("%[s%](.-)%[/s%]", "<del>%1</del>")
   
-  text = text:gsub("%[quote%](.-)%[/quote%]", "<blockquote>%1</blockquote>")
+  -- these can be nested, so replace open and closed separately
+  -- text = text:gsub("%[quote%]", "<blockquote>")
+  -- text = text:gsub("%[/quote%]", "</blockquote>")
+  text = text:gsub("%[(/?)quote%]", "<%1blockquote>")
 
   -- replace loose links
   text = text:gsub("(https?://[%w-_%.%?%.:/%+=&~%@#%%]+[%w-/])", function(url)
@@ -57,9 +59,6 @@ function babycode.to_html(s, escape_html)
 
   -- rule
   text = text:gsub("\n+%-%-%-", "<hr>")
-  
-  -- normalize newlines, replace them with <br>
-  text = text:gsub("\r?\n\r?\n+", "<br>")--:gsub("\r?\n", "<br>")
 
   -- replace code block placeholders back with their original contents
   text = text:gsub("\1CODE:(%d+)\1", function(n)