98 lines
2.7 KiB
Rust
98 lines
2.7 KiB
Rust
use regex::Regex;
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use std::path::Path;
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use errors::*;
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use super::{Preprocessor, PreprocessorContext};
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use book::{Book, BookItem};
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/// A preprocessor for converting file name `README.md` to `index.md` since
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/// `README.md` is the de facto index file in a markdown-based documentation.
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pub struct IndexPreprocessor;
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impl IndexPreprocessor {
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/// Create a new `IndexPreprocessor`.
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pub fn new() -> Self {
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IndexPreprocessor
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}
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}
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impl Preprocessor for IndexPreprocessor {
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fn name(&self) -> &str {
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"index"
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}
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fn run(&self, ctx: &PreprocessorContext, book: &mut Book) -> Result<()> {
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let source_dir = ctx.root.join(&ctx.config.book.src);
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book.for_each_mut(|section: &mut BookItem| {
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if let BookItem::Chapter(ref mut ch) = *section {
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if is_readme_file(&ch.path) {
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let index_md = source_dir.join(ch.path.with_file_name("index.md"));
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if index_md.exists() {
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warn_readme_name_conflict(&ch.path, &index_md);
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}
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ch.path.set_file_name("index.md");
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}
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}
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});
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Ok(())
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}
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}
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fn warn_readme_name_conflict<P: AsRef<Path>>(readme_path: P, index_path: P) {
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let file_name = readme_path.as_ref().file_name().unwrap_or_default();
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let parent_dir = index_path.as_ref().parent().unwrap_or(index_path.as_ref());
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warn!(
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"It seems that there are both {:?} and index.md under \"{}\".",
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file_name,
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parent_dir.display()
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);
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warn!(
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"mdbook converts {:?} into index.html by default. It may cause",
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file_name
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);
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warn!("unexpected behavior if putting both files under the same directory.");
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warn!("To solve the warning, try to rearrange the book structure or disable");
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warn!("\"index\" preprocessor to stop the conversion.");
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}
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fn is_readme_file<P: AsRef<Path>>(path: P) -> bool {
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lazy_static! {
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static ref RE: Regex = Regex::new(r"(?i)^readme$").unwrap();
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}
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RE.is_match(
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path.as_ref()
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.file_stem()
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.and_then(|s| s.to_str())
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.unwrap_or_default(),
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)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn file_stem_exactly_matches_readme_case_insensitively() {
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let path = "path/to/Readme.md";
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assert!(is_readme_file(path));
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let path = "path/to/README.md";
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assert!(is_readme_file(path));
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let path = "path/to/rEaDmE.md";
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assert!(is_readme_file(path));
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let path = "path/to/README.markdown";
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assert!(is_readme_file(path));
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let path = "path/to/README";
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assert!(is_readme_file(path));
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let path = "path/to/README-README.md";
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assert!(!is_readme_file(path));
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}
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}
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