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d9ca529356
libripgrep is not any one library, but rather, a collection of libraries that roughly separate the following key distinct phases in a grep implementation: 1. Pattern matching (e.g., by a regex engine). 2. Searching a file using a pattern matcher. 3. Printing results. Ultimately, both (1) and (3) are defined by de-coupled interfaces, of which there may be multiple implementations. Namely, (1) is satisfied by the `Matcher` trait in the `grep-matcher` crate and (3) is satisfied by the `Sink` trait in the `grep2` crate. The searcher (2) ties everything together and finds results using a matcher and reports those results using a `Sink` implementation. Closes #162
34 lines
759 B
Rust
34 lines
759 B
Rust
extern crate grep_regex;
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extern crate grep_searcher;
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use std::env;
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use std::error::Error;
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use std::io;
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use std::process;
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use grep_regex::RegexMatcher;
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use grep_searcher::Searcher;
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use grep_searcher::sinks::UTF8;
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fn main() {
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if let Err(err) = example() {
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eprintln!("{}", err);
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process::exit(1);
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}
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}
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fn example() -> Result<(), Box<Error>> {
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let pattern = match env::args().nth(1) {
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Some(pattern) => pattern,
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None => return Err(From::from(format!(
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"Usage: search-stdin <pattern>"
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))),
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};
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let matcher = RegexMatcher::new(&pattern)?;
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Searcher::new().search_reader(&matcher, io::stdin(), UTF8(|lnum, line| {
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print!("{}:{}", lnum, line);
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Ok(true)
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}))?;
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Ok(())
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}
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