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mirror of https://github.com/SquidDev-CC/CC-Tweaked synced 2024-12-26 18:10:29 +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often out-of-date with CC:T, which means example snippets fail when you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

1.3 KiB

module: [kind=event] file_transfer since: 1.101.0

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.

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.

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