Cannot clear highlights in `bat::PrettyPrinter` instance

[rhysd]

Describe the bug you encountered:

Let's say we have the following code:

use bat::PrettyPrinter;

let targets: (PathBuf, Vec<(usize, usize)>) = vec![];

let mut pp = PrettyPrinter::new();
for (path, ranges) in targets.iter() {
    pp.input_file(path);
    for (start, end) in ranges.iter() {
        pp.highlight_range(*start, *end);
    }

    // This clears inputs, but does not clear highlights
    pp.print().unwrap();
}

Since there are multiple files with different highlight ranges, I want to print each files with different ranges. However, currently there is no way to clear highlights in bat::PrettyPrinter instance.

Creating bat::PrettyPrinter instance for each file is an option. However it is much slower because bat::PrettyPrinter::new deserializes binary assets and it is time consuming.

What did you expect to happen instead?

I'd like bat::PrettyPrinter to provide some API to clear highlights.

How did you install bat?

[dependencies]
bat = { version = "0.18.3", default-features = false }

in my project's Cargo.toml.

---

bat version and environment

• bat: 0.18.3
• OS: macOS 10.15
• Rust: 1.56

[Enselic]

Creating bat::PrettyPrinter instance for each file is an option. However it is much slower because bat::PrettyPrinter::new deserializes binary assets and it is time consuming.

Just wanted to add a remark: This should be be much less of a problem now that syntaxes are lazy-loaded.