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CC-Tweaked/doc/events/task_complete.md
Jonathan Coates 895bc7721a
License CC:T according to the REUSE specification (#1351)
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REUSE[1] specification. This does not include any asset files (such as
generated JSON files, or textures). While REUSE does support doing so
with ".license" files, for now we define these licences using the
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[1]: https://reuse.software/
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---
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: LicenseRef-CCPL
-->
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
```