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CC-Tweaked/doc/events/task_complete.md
Jonathan Coates a9547d1d6f
Further licensing work
- Fix several inaccuracies with several files not marking Dan's
   authorship. Most of these are new files, where the code was moved from
   somewhere else:
   - In the public API:  IDynamicLuaObject, ILuaAPI, TaskCallbakc,
     IDynamicPeripheral, UpgradeBase
   - In the ROM: fs, http, require

 - Do not mark Dan as an author for entirely new code. This affects
   DetailHelpers, DropConsumer, FluidData, InventoryMethods, ItemDetails,
   MonitorRenderState, NoTermComputerScreen, Palette, PlatformHelperImpl,
   UploadFileMessage, the Terminal tests, and any speaker-related files.

 - Relicence many files under the MPL where we have permission to do
   so. See #1339 for further details.

Thank you to everyone who has contributed so far! Cannot overstate how
appreciated it is <3.
2023-03-29 23:00:18 +01:00

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Markdown

---
module: [kind=event] task_complete
see: commands.execAsync To run a command which fires a task_complete event.
---
<!--
SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
SPDX-License-Identifier: MPL-2.0
-->
The @{task_complete} event is fired when an asynchronous task completes. This is usually handled inside the function call that queued the task; however, functions such as @{commands.execAsync} return immediately so the user can wait for completion.
## Return Values
1. @{string}: The event name.
2. @{number}: The ID of the task that completed.
3. @{boolean}: Whether the command succeeded.
4. @{string}: If the command failed, an error message explaining the failure. (This is not present if the command succeeded.)
5. <abbr title="Variable number of arguments">&hellip;</abbr>: Any parameters returned from the command.
## Example
Prints the results of an asynchronous command:
```lua
local taskID = commands.execAsync("say Hello")
local event
repeat
event = {os.pullEvent("task_complete")}
until event[2] == taskID
if event[3] == true then
print("Task " .. event[2] .. " succeeded:", table.unpack(event, 4))
else
print("Task " .. event[2] .. " failed: " .. event[4])
end
```