When using grep-printer, only the first line has colored matches. How do I make all lines have color?

[OleMussmann]

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• I have a different issue.

What version of ripgrep are you using?

crate: grep = "0.3.2"

How did you install ripgrep?

Cargo

What operating system are you using ripgrep on?

NixOS 24.11.20241230.3ffbbdb (Vicuna)

Describe your bug.

grep::printer does not color all the matches when searching for a regex matching the start of a line, only the first one. Regular matches or matches at the end of a line work fine.

What are the steps to reproduce the behavior?

Example code:

use grep::{printer, regex, searcher};
use termcolor;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let content = "abcde abcde\nabcde abcde\nabcde abcde";
    let search_terms = [
        "abcde",  // regular match
        "^abcde", // start of the line
        "abcde$", // end of the line
    ];
    let color_specs = printer::ColorSpecs::new(&["match:fg:red".parse()?]);

    for search_term in search_terms {
        let matcher = regex::RegexMatcherBuilder::new().build(search_term)?;
        let mut printer = printer::StandardBuilder::new()
            .color_specs(color_specs.clone())
            .build(termcolor::StandardStream::stdout(
                termcolor::ColorChoice::Always,
            ));

        println!();
        println!("Searching for \"{search_term}\":");
        searcher::Searcher::new().search_slice(
            &matcher,
            &content.as_bytes(),
            printer.sink(&matcher),
        )?;
    }

    Ok(())
}

What is the actual behavior?

Output image from example code:

What is the expected behavior?

My expectation would be that for the search term "^abcde" matches would be colored for all printed lines.

Is it a bug in grep-printer or am I using the libraries incorrectly?

[BurntSushi]

You need to enable grep_regex::RegexMatcherBuilder::multi_line. Then it should work.

[OleMussmann]

Yes, that's what I was missing. Thanks a lot for the quick help. 🙏

For future me, this is the fixed example:

use grep::{printer, regex, searcher};
use termcolor;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let content = "abcde abcde\nabcde abcde\nabcde abcde";
    let search_terms = [
        "abcde",  // regular match
        "^abcde", // start of the line
        "abcde$", // end of the line
    ];
    let color_specs = printer::ColorSpecs::new(&["match:fg:red".parse()?]);

    for search_term in search_terms {
        let matcher = regex::RegexMatcherBuilder::new()
            .multi_line(true)  // <- !
            .build(search_term)?;
        let mut printer = printer::StandardBuilder::new()
            .color_specs(color_specs.clone())
            .build(termcolor::StandardStream::stdout(
                termcolor::ColorChoice::Always,
            ));

        println!();
        println!("Searching for \"{search_term}\":");
        searcher::Searcher::new().search_slice(
            &matcher,
            &content.as_bytes(),
            printer.sink(&matcher),
        )?;
    }

    Ok(())
}