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mirror of https://github.com/SquidDev-CC/CC-Tweaked synced 2024-11-14 22:04:53 +00:00
CC-Tweaked/doc/events/file_transfer.md
Jonathan Coates c0643fadca
Build a web-based emulator for the documentation site (#1597)
Historically we've used copy-cat to provide a web-based emulator for
running example code on our documentation site. However, copy-cat is
often out-of-date with CC:T, which means example snippets fail when you
try to run them!

This commit vendors in copy-cat (or rather an updated version of it)
into CC:T itself, allowing us to ensure the emulator is always in sync
with the mod.

While the ARCHITECTURE.md documentation goes into a little bit more
detail here, the general implementation is as follows

 - In project/src/main we implement the core of the emulator. This
   includes a basic reimplementation of some of CC's classes to work on
   the web (mostly the HTTP API and ComputerThread), and some additional
   code to expose the computers to Javascript.

 - This is all then compiled to Javascript using [TeaVM][1] (we actually
   use a [personal fork of it][2] as there's a couple of changes I've
   not upstreamed yet).

 - The Javascript side then pulls in the these compiled classes (and
   the CC ROM) and hooks them up to [cc-web-term][3] to display the
   actual computer.

 - As we're no longer pulling in copy-cat, we can simplify our bundling
   system a little - we now just compile to ESM modules directly.

[1]: https://github.com/konsoletyper/teavm
[2]: https://github.com/SquidDev/teavm/tree/squid-patches
[3]: https://github.com/squiddev-cc/cc-web-term
2023-10-03 09:19:19 +01:00

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Markdown

---
module: [kind=event] file_transfer
since: 1.101.0
---
<!--
SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
SPDX-License-Identifier: MPL-2.0
-->
The [`file_transfer`] event is queued when a user drags-and-drops a file on an open computer.
This event contains a single argument of type [`TransferredFiles`], which can be used to [get the files to be
transferred][`TransferredFiles.getFiles`]. Each file returned is a [binary file handle][`fs.BinaryReadHandle`] with an
additional [getName][`TransferredFile.getName`] method.
## Return values
1. [`string`]: The event name
2. [`TransferredFiles`]: The list of transferred files.
## Example
Waits for a user to drop files on top of the computer, then prints the list of files and the size of each file.
```lua
local _, files = os.pullEvent("file_transfer")
for _, file in ipairs(files.getFiles()) do
-- Seek to the end of the file to get its size, then go back to the beginning.
local size = file.seek("end")
file.seek("set", 0)
print(file.getName() .. " " .. size)
end
```
## Example
Save each transferred file to the computer's storage.
```lua
local _, files = os.pullEvent("file_transfer")
for _, file in ipairs(files.getFiles()) do
local handle = fs.open(file.getName(), "wb")
handle.write(file.readAll())
handle.close()
file.close()
end
```