Auto vimdoc update

doc/lua-async-await.txt

@@ -0,0 +1,135 @@
+*lua-async-await.txt*     For Neovim >= 0.9.4    Last change: 2023 December 10
+
+==============================================================================
+Table of Contents                          *lua-async-await-table-of-contents*
+
+1. Lua Async Await                           |lua-async-await-lua-async-await|
+  - Why?                                                |lua-async-await-why?|
+  - How to use                                    |lua-async-await-how-to-use|
+
+==============================================================================
+1. Lua Async Await                           *lua-async-await-lua-async-await*
+
+This is basically ms-jpq/lua-async-await
+<https://github.com/ms-jpq/lua-async-await> but with Promise like error
+handling
+
+Refer the original repository for more comprehensive documentation on how all
+this works
+
+
+WHY?                                                    *lua-async-await-why?*
+
+A Language Server command response contains two parameters. `error` &
+`response`. If the error is present then the error should be handled.
+
+Ex:-
+
+>lua
+    self.client.request('workspace/executeCommand', cmd_info, function(err, res)
+      if err then
+        log.error(command .. ' failed! arguments: ', arguments, ' error: ', err)
+      else
+        log.debug(command .. ' success! response: ', res)
+      end
+    end, buffer)
+<
+
+Promises are fine but chaining is annoying specially when you don’t have
+arrow function like syntactic sugar. Moreover, at the time of this is writing,
+Lua language server generics typing is so primitive and cannot handle
+`Promise<Something>` like types.
+
+So I wanted Promise like error handling but without Promises.
+
+
+HOW TO USE                                        *lua-async-await-how-to-use*
+
+Assume following is the asynchronous API
+
+>lua
+    local function lsp_request(callback)
+      local timer = vim.loop.new_timer()
+
+      assert(timer)
+
+      timer:start(2000, 0, function()
+        -- First parameter is the error
+        callback('something went wrong', nil)
+      end)
+    end
+<
+
+
+WHEN NO ERROR HANDLER DEFINED ~
+
+This is how you can call this asynchronous API without a callback
+
+>lua
+    local M = require('sync')
+
+    M.sync(function()
+      local response = M.wait_handle_error(M.wrap(lsp_request)())
+    end).run()
+<
+
+Result:
+
+>
+    Error executing luv callback:
+    test6.lua:43: unhandled error test6.lua:105: something went wrong
+    stack traceback:
+      [C]: in function 'error'
+      test6.lua:43: in function 'callback'
+      test6.lua:130: in function <test6.lua:129>
+<
+
+
+WHEN ERROR HANDLER IS DEFINED ~
+
+>lua
+    local M = require('sync')
+
+    local main = M.sync(function()
+      local response = M.wait_handle_error(M.wrap(lsp_request)())
+    end)
+      .catch(function(err)
+        print('error occurred ', err)
+      end)
+      .run()
+<
+
+Result:
+
+>
+    error occurred test6.lua:105: something went wrong
+<
+
+
+WHEN NESTED ~
+
+>lua
+    local M = require('sync')
+
+    local nested = M.sync(function()
+      local response = M.wait_handle_error(M.wrap(lsp_request)())
+    end)
+
+    M.sync(function()
+      M.wait_handle_error(nested.run)
+    end)
+      .catch(function(err)
+        print('parent error handler ' .. err)
+      end)
+      .run()
+<
+
+Result:
+
+>
+    parent error handler test6.lua:105: test6.lua:105: something went wrong
+<
+
+Generated by panvimdoc <https://github.com/kdheepak/panvimdoc>
+
+vim:tw=78:ts=8:noet:ft=help:norl: