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extern crate grep_regex;
extern crate grep_searcher;
use std::env;
use std::error::Error;
use std::io;
use std::process;
use grep_regex::RegexMatcher;
use grep_searcher::sinks::UTF8;
use grep_searcher::Searcher;
fn main() {
if let Err(err) = example() {
eprintln!("{}", err);
process::exit(1);
}
}
fn example() -> Result<(), Box<dyn Error>> {
let pattern = match env::args().nth(1) {
Some(pattern) => pattern,
None => {
return Err(From::from(format!("Usage: search-stdin <pattern>")))
}
};
let matcher = RegexMatcher::new(&pattern)?;
Searcher::new().search_reader(
&matcher,
io::stdin(),
UTF8(|lnum, line| {
print!("{}:{}", lnum, line);
Ok(true)
}),
)?;
Ok(())
}
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