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olian04 / gleam_stdin Goto Github PK

This package provides a synchronous iterator for consuming stdin. It supports all the non-browser targets, Erlang, Node, Deno, and Bun.

Home Page: https://hex.pm/packages/stdin

JavaScript 64.69% Gleam 35.31%

gleam gleam-lang gleam-language stdin stdio bun deno erlang nodejs

gleam_stdin's Introduction

stdin

stdin provides a synchronous iterator for consuming stdin. It supports all the non-browser targets, Erlang, Node, Deno, and Bun.

The goal of this package is to provide a uniform way of consuming stdin for all supported targets on all supported platforms.

Platform	Target Status	Date
Windows 10	All OK.	`2024-06-08`
macOS 14.5	All OK.	`2024-06-11`
Ubuntu 24.04	All OK.	`2024-06-11`
Fedora 40	All OK.	`2024-06-11`

gleam add stdin

import gleam/io
import gleam/iterator
import stdin.{stdin}

pub fn main() {
  stdin()
  |> iterator.to_list
  |> io.debug
}

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

Development

cat README.md | gleam test --target=javascript --runtime=node
cat README.md | gleam test --target=javascript --runtime=bun
cat README.md | gleam test --target=javascript --runtime=deno
cat README.md | gleam test --target=erlang

gleam_stdin's People

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gleam_stdin's Issues

Add support for Deno

$ cat README.md | gleam run --target=javascript --runtime=deno
   Compiled in 0.01s
    Running win_test.main
error: Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'stdin')
  process.stdin.resume();
          ^
    at stdinGenerator (file:///C:/Users/rift9/projects/win_test/build/dev/javascript/stdin/js_ffi.mjs:7:11)
    at stdinGenerator.next (<anonymous>)
    at read_line (file:///C:/Users/rift9/projects/win_test/build/dev/javascript/stdin/js_ffi.mjs:48:22)
    at read_line (file:///C:/Users/rift9/projects/win_test/build/dev/javascript/stdin/stdin.mjs:8:15)
    at file:///C:/Users/rift9/projects/win_test/build/dev/javascript/gleam_stdlib/gleam/iterator.mjs:102:53
    at file:///C:/Users/rift9/projects/win_test/build/dev/javascript/gleam_stdlib/gleam/iterator.mjs:84:13
    at file:///C:/Users/rift9/projects/win_test/build/dev/javascript/gleam_stdlib/gleam/iterator.mjs:472:13
    at file:///C:/Users/rift9/projects/win_test/build/dev/javascript/gleam_stdlib/gleam/iterator.mjs:247:13
    at do_fold (file:///C:/Users/rift9/projects/win_test/build/dev/javascript/gleam_stdlib/gleam/iterator.mjs:152:13)
    at fold (file:///C:/Users/rift9/projects/win_test/build/dev/javascript/gleam_stdlib/gleam/iterator.mjs:167:10)

Document that non-UNIX environments are not supported

Hello!

The description of this package claims that only the browser is not supported, but it also does not work on Windows or any other environment without stdin being fd 0. It would be fab to document this.

Thank you,
Louis

EAGAIN: resource temporarily unavailable

Running the following code with Nodejs v22.2.0 throws an error

import gleam/io
import gleam/iterator.{Next}
import stdin.{stdin}

pub fn main() {
  let assert Next(line1, _) =
    stdin()
    |> iterator.step()
  io.debug(line1)

  let assert Next(line2, _) =
    stdin()
    |> iterator.step()
  io.debug(line2)
}

Screencast.from.2024-06-08.13-06-43.mp4

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