feat: streaming attempt completion (#2113)

lua/avante/llm_tools/attempt_completion.lua

@@ -1,8 +1,9 @@
 local Base = require("avante.llm_tools.base")
 local Config = require("avante.config")
-local HistoryMessage = require("avante.history_message")
+local Highlights = require("avante.highlights")
+local Line = require("avante.ui.line")
 
----@alias AttemptCompletionInput {result: string, command?: string}
+---@alias AttemptCompletionInput {result: string, command?: string, streaming?: boolean}
 
 ---@class AvanteLLMTool
 local M = setmetatable({}, Base)
@@ -54,7 +55,16 @@ M.returns = {
 }
 
 ---@type AvanteLLMToolOnRender<AttemptCompletionInput>
-function M.on_render() return {} end
+function M.on_render(opts)
+  local lines = {}
+  table.insert(lines, Line:new({ { "✓  Task Completed", Highlights.AVANTE_TASK_COMPLETED } }))
+  local result = opts.result or ""
+  local text_lines = vim.split(result, "\n")
+  for _, text_line in ipairs(text_lines) do
+    table.insert(lines, Line:new({ { text_line } }))
+  end
+  return lines
+end
 
 ---@type AvanteLLMToolFunc<AttemptCompletionInput>
 function M.func(opts, on_log, on_complete, session_ctx)
@@ -62,13 +72,6 @@ function M.func(opts, on_log, on_complete, session_ctx)
   local sidebar = require("avante").get()
   if not sidebar then return false, "Avante sidebar not found" end
   session_ctx.attempt_completion_is_called = true
-  local message = HistoryMessage:new({
-    role = "assistant",
-    content = opts.result,
-  }, {
-    just_for_display = true,
-  })
-  sidebar:add_history_messages({ message })
   if opts.command and opts.command ~= "" and opts.command ~= vim.NIL then
     require("avante.llm_tools.bash").func({ command = opts.command }, on_log, on_complete, session_ctx)
   else