//! Tests for custom preprocessors.

use crate::prelude::*;
use mdbook::book::Book;
use mdbook::errors::Result;
use mdbook::preprocess::{Preprocessor, PreprocessorContext};
use std::sync::{Arc, Mutex};

struct Spy(Arc<Mutex<Inner>>);

#[derive(Debug, Default)]
struct Inner {
    run_count: usize,
    rendered_with: Vec<String>,
}

impl Preprocessor for Spy {
    fn name(&self) -> &str {
        "dummy"
    }

    fn run(&self, ctx: &PreprocessorContext, book: Book) -> Result<Book> {
        let mut inner = self.0.lock().unwrap();
        inner.run_count += 1;
        inner.rendered_with.push(ctx.renderer.clone());
        Ok(book)
    }
}

// Test that preprocessor gets run.
#[test]
fn runs_preprocessors() {
    let test = BookTest::init(|_| {});
    let spy: Arc<Mutex<Inner>> = Default::default();
    let mut book = test.load_book();
    book.with_preprocessor(Spy(Arc::clone(&spy)));
    book.build().unwrap();

    let inner = spy.lock().unwrap();
    assert_eq!(inner.run_count, 1);
    assert_eq!(inner.rendered_with, ["html"]);
}