csv-stream

For building CSVs as Streams or Iterators.

```rust

[derive(Serialize)]

struct Row<'a> { city: &'a str, country: &'a str, // Serde allows us to name our headers exactly, // even if they don't match our struct field names. #[serde(rename = "popcount")] population: u64, }

let rows = vec![ Row { city: "Boston", country: "United States", population: 4628910, }, Row { city: "Concord", country: "United States", population: 42695, }, ];

let writer = WriterBuilder::default().build();

let rowstream = futures::stream::iter(ROWS); let csvstream = Stream::new(row_stream, writer);

let mut buf = vec![]; while let Some(res) = csvstream.next().await { buf.extendfrom_slice(&res.unwrap()) }

let buf = String::from_utf8(buf).unwrap();

assert_eq!( buf, r#"city,country,popcount Boston,United States,4628910 Concord,United States,42695 "# ); ```