miniio-quick-eval

name	miniio-quick-eval
description	Prototype small MoonBit WASIp1 stdin/stdout filters with moon run -c and moonbit-community/miniio, especially jq-style JSON transforms, without creating a package.

MiniIO Quick Eval

Use this when the user wants a quick one-off MoonBit WASIp1 script with moon run -c, especially for stdin/stdout filters, JSON inspection, or small miniio API experiments that do not deserve a full package.

Pattern

• Use MoonBit's single-file import header at the top of the -c source.
• Import moonbit-community/miniio/io when using reader, writer, or data extension methods such as read_all(), write(), and .text().
• Prefer stdin.read_all().text() for UTF-8 stdin text.
• Write normal output to @miniio.stdout; write diagnostics to @miniio.stderr and exit nonzero with @miniio.exit(1).
• Keep these scripts small. If the source grows beyond one screen or needs files/assets/tests, create a normal package instead.

JSON Filter Example

printf '{"name":"miniio","ok":true}' | moon run -c 'import {
  "moonbit-community/miniio" @miniio,
  "moonbit-community/miniio/io",
  "moonbitlang/core/json" @json,
}

fn main {
  try {
    let input = @miniio.stdin.read_all().text()
    let value = @json.parse(input)
    @miniio.stdout.write_text(value.stringify(indent=2) + "\n")
  } catch {
    e => {
      @miniio.stderr.write_text("jq failed: \{e}\n") catch { _ => () }
      @miniio.exit(1)
    }
  }
}'

Expected output:

{
  "name": "miniio",
  "ok": true
}

Validation

For syntax-only examples, test the same shape with a registry-resolvable package or a temporary local package. For released miniio usage, the command itself is the validation.