Merge pull request #985 from Michael-F-Bryan/enable-caching
Allow backends to cache previous results
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commit
aaeb3e2852
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@ -261,6 +261,10 @@ in [`RenderContext`].
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> **Note:** There is no guarantee that the destination directory exists or is
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> empty (`mdbook` may leave the previous contents to let backends do caching),
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> so it's always a good idea to create it with `fs::create_dir_all()`.
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>
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> If the destination directory already exists, don't assume it will be empty.
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> To allow backends to cache the results from previous runs, `mdbook` may leave
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> old content in the directory.
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There's always the possibility that an error will occur while processing a book
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(just look at all the `unwrap()`'s we've written already), so `mdbook` will
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@ -190,19 +190,6 @@ impl MDBook {
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renderer.name().to_string(),
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);
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let name = renderer.name();
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let build_dir = self.build_dir_for(name);
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if build_dir.exists() {
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debug!(
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"Cleaning build dir for the \"{}\" renderer ({})",
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name,
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build_dir.display()
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);
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utils::fs::remove_dir_content(&build_dir)
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.chain_err(|| "Unable to clear output directory")?;
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}
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for preprocessor in &self.preprocessors {
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if preprocessor_should_run(&**preprocessor, renderer, &self.config) {
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debug!("Running the {} preprocessor.", preprocessor.name());
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@ -282,6 +282,11 @@ impl Renderer for HtmlHandlebars {
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let destination = &ctx.destination;
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let book = &ctx.book;
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if destination.exists() {
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utils::fs::remove_dir_content(destination)
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.chain_err(|| "Unable to remove stale HTML output")?;
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}
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trace!("render");
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let mut handlebars = Handlebars::new();
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