vendor/bstr/examples/graphemes.rs

   1 extern crate bstr;
   2
   3 use std::error::Error;
   4 use std::io::{self, Write};
   5
   6 use bstr::{io::BufReadExt, ByteSlice};
   7
   8 fn main() -> Result<(), Box<dyn Error>> {
   9     let stdin = io::stdin();
  10     let mut stdout = io::BufWriter::new(io::stdout());
  11
  12     stdin.lock().for_byte_line_with_terminator(|line| {
  13         let end = line
  14             .grapheme_indices()
  15             .map(|(_, end, _)| end)
  16             .take(10)
  17             .last()
  18             .unwrap_or(line.len());
  19         stdout.write_all(line[..end].trim_end())?;
  20         stdout.write_all(b"\n")?;
  21         Ok(true)
  22     })?;
  23     Ok(())
  24 }