Gleam File Streams

This Gleam library provides access to Erlang’s binary file streams for reading and writing files. If you don’t require streaming behavior then consider using simplifile instead.

This library only supports the Erlang target.

Example

Add this library to your project:

gleam add file_streams

The following code writes a string to a file using a write stream and then reads it back in using a read stream.

import file_streams/read_stream
import file_streams/write_stream
import gleam/bit_array

// ...

let assert Ok(ws) = write_stream.open("test.txt")
let assert Ok(Nil) = write_stream.write_bytes(ws, <<"Hello, world!":utf8>>)
let assert Ok(Nil) = write_stream.write_bytes(ws, <<"12":utf8>>)
let assert Ok(Nil) = write_stream.close(ws)

let assert Ok(rs) = read_stream.open("test.txt")

let assert Ok(bytes) = read_stream.read_bytes(rs, 13)
let assert Ok("Hello, world!") = bit_array.to_string(bytes)
let assert Ok([49, 50]) = read_stream.read_list(rs, read_stream.read_uint8, 2)

let assert Error(read_stream.EndOfStream) = read_stream.read_bytes(rs, 1)

read_stream.close(rs)

Further documentation can be found at https://hexdocs.pm/file_streams.

License

This library is published under the MIT license, a copy of which is included.