perf(summary): reduce renders using render loop

Massifively reduces renders of the summary window by queuing renders
rather than instantly rendering every time an update happens. Updates
can now be much more common due to streamed results

See #78

lua/neotest/consumers/summary/init.lua

@@ -49,7 +49,10 @@ end
 
 local components = {}
 
+local render_cond = async.control.Condvar.new()
+
 local focused
+local all_expanded = {}
 local function render(expanded)
   if not is_open() then
     return
@@ -64,35 +67,47 @@ local function render(expanded)
       vim.schedule(render)
     end)
   end
-  local canvas = Canvas.new(config.summary)
-  if not ready then
-    canvas:write("Parsing tests")
-  else
-    local cwd = async.fn.getcwd()
-    for _, adapter_id in ipairs(client:get_adapters()) do
-      local tree = client:get_position(nil, { adapter = adapter_id })
-      canvas:write(adapter_id .. "\n", { group = config.highlights.adapter_name })
-      if tree:data().path ~= cwd then
-        local root_dir = async.fn.fnamemodify(tree:data().path, ":.")
-        canvas:write(root_dir .. "\n", { group = config.highlights.dir })
+  for pos_id, _ in pairs(expanded or {}) do
+    all_expanded[pos_id] = true
+  end
+  render_cond:notify_all()
+end
+
+async.run(function()
+  while true do
+    render_cond:wait()
+    local canvas = Canvas.new(config.summary)
+    if not client:has_started() then
+      canvas:write("Parsing tests")
+    else
+      local cwd = async.fn.getcwd()
+      for _, adapter_id in ipairs(client:get_adapters()) do
+        local tree = client:get_position(nil, { adapter = adapter_id })
+        canvas:write(adapter_id .. "\n", { group = config.highlights.adapter_name })
+        if tree:data().path ~= cwd then
+          local root_dir = async.fn.fnamemodify(tree:data().path, ":.")
+          canvas:write(root_dir .. "\n", { group = config.highlights.dir })
+        end
+        components[adapter_id] = components[adapter_id] or SummaryComponent(client, adapter_id)
+        components[adapter_id]:render(canvas, tree, all_expanded, focused)
+        all_expanded = {}
+        canvas:write("\n")
+      end
+      if canvas:length() > 1 then
+        canvas:remove_line()
+        canvas:remove_line()
+      else
+        canvas:write("No tests found")
       end
-      components[adapter_id] = components[adapter_id] or SummaryComponent(client, adapter_id)
-      components[adapter_id]:render(canvas, tree, expanded or {}, focused)
-      canvas:write("\n")
     end
-    if canvas:length() > 1 then
-      canvas:remove_line()
-      canvas:remove_line()
-    else
-      canvas:write("No tests found")
+    local rendered, err = canvas:render_buffer(summary_buf)
+    if not rendered then
+      logger.error("Couldn't render buffer", err)
     end
+    async.api.nvim_exec("redraw", false)
+    async.util.sleep(100)
   end
-  local rendered, err = canvas:render_buffer(summary_buf)
-  if not rendered then
-    logger.error("Couldn't render buffer", err)
-  end
-  async.api.nvim_exec("redraw", false)
-end
+end)
 
 local function expand(pos_id, recursive, focus)
   local tree = client:get_position(pos_id)
@@ -129,6 +144,7 @@ local function init()
   client.listeners.results = function(adapter_id, results)
     if not config.summary.expand_errors then
       render()
+      return
     end
     local expanded = {}
     for pos_id, result in pairs(results) do