poorgrep

Cargo.toml

[package]
authors = ["Sebastian Wicki <gandro@gmx.net>"]
name = "poorgrep"
version = "0.1.0"

[dependencies]
grep = "0.1.6"
ignore = "0.2.2"
memmap = "0.5.2"

main.rs

extern crate memmap;
extern crate ignore;
extern crate grep;

use memmap::{Mmap, Protection};
use ignore::{WalkBuilder, WalkState};
use grep::{Grep, GrepBuilder};

use std::io::Result;
use std::path::Path;

fn search_file(file: &Path, pattern: &Grep) -> Result<()> {
    let file_mmap = Mmap::open_path(file, Protection::Read)?;
    let bytes = unsafe { file_mmap.as_slice() };
    for m in pattern.iter(bytes) {
        let line = &bytes[m.start()..m.end()];
        println!("Match found in file {:?}: {:?}", file, String::from_utf8_lossy(&line))
    }
    Ok(()) 
}

fn main() {
    let pattern  = GrepBuilder::new("foo").build().expect("invalid pattern");
    let files = WalkBuilder::new("./").build_parallel();
    files.run(|| {
        let pattern = pattern.clone();
        Box::new(move |entry| {
            let dir_entry = entry.expect("failed to walk files");
            if dir_entry.file_type().map(|e| e.is_file()).unwrap_or(false) {
                search_file(dir_entry.path(), &pattern).expect("grepping file failed");
            }
            WalkState::Continue
        })
    });
}