Improve markdown block format

lua/fittencode/engines/actions.lua

@@ -164,7 +164,7 @@ local function on_error(err)
   end
   Log.debug('Action elapsed time: {}', elapsed_time)
   Log.debug('Action depth: {}', depth)
-  chat:commit('> Q.E.D.' .. '(' .. elapsed_time .. ' ms)' .. '\n', true)
+  chat:commit('> Q.E.D.' .. '(' .. elapsed_time .. ' ms)' .. '\n', true, true)
   current_eval = current_eval + 1
 end
 

lua/fittencode/views/chat.lua

@@ -68,9 +68,20 @@ function M:close()
   -- self.buffer = nil
 end
 
+local stack = {}
+
+local function push_stack(x)
+  if #stack == 0 or stack[#stack] ~= x then
+    table.insert(stack, x)
+  else
+    table.remove(stack)
+  end
+end
+
 ---@param text? string|string[]
 ---@param linebreak? boolean
-function M:commit(text, linebreak)
+---@param force? boolean
+function M:commit(text, linebreak, force)
   local lines = nil
   if type(text) == 'string' then
     lines = vim.split(text, '\n')
@@ -79,6 +90,14 @@ function M:commit(text, linebreak)
   else
     return
   end
+  vim.tbl_map(function(x)
+    if x == '```' then
+      push_stack(x)
+    end
+  end, lines)
+  if #stack > 0 and not force then
+    linebreak = false
+  end
   if linebreak and #self.text > 0 and #lines > 0 then
     if lines[1] ~= '' and not string.match(lines[1], '^```') and self.text[#self.text] ~= '' and not string.match(self.text[#self.text], '^```') then
       table.insert(lines, 1, '')