95 lines
2.9 KiB
Rust
95 lines
2.9 KiB
Rust
//! This program removes all forms of emphasis from the markdown of the book.
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extern crate mdbook;
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extern crate pulldown_cmark;
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extern crate pulldown_cmark_to_cmark;
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use mdbook::book::{Book, BookItem, Chapter};
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use mdbook::errors::{Error, Result};
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use mdbook::preprocess::{Preprocessor, PreprocessorContext};
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use mdbook::MDBook;
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use pulldown_cmark::{Event, Parser, Tag};
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use pulldown_cmark_to_cmark::fmt::cmark;
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use std::env::{args, args_os};
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use std::ffi::OsString;
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use std::process;
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struct Deemphasize;
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impl Preprocessor for Deemphasize {
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fn name(&self) -> &str {
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"md-links-to-html-links"
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}
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fn run(&self, _ctx: &PreprocessorContext, book: &mut Book) -> Result<()> {
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eprintln!("Running '{}' preprocessor", self.name());
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let mut res: Option<_> = None;
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let mut num_removed_items = 0;
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book.for_each_mut(|item: &mut BookItem| {
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if let Some(Err(_)) = res {
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return;
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}
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if let BookItem::Chapter(ref mut chapter) = *item {
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eprintln!("{}: processing chapter '{}'", self.name(), chapter.name);
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res = Some(
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match Deemphasize::remove_emphasis(&mut num_removed_items, chapter) {
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Ok(md) => {
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chapter.content = md;
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Ok(())
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}
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Err(err) => Err(err),
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},
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);
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}
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});
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eprintln!(
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"{}: removed {} events from markdown stream.",
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self.name(),
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num_removed_items
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);
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match res {
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Some(res) => res,
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None => Ok(()),
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}
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}
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}
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fn do_it(book: OsString) -> Result<()> {
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let mut book = MDBook::load(book)?;
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book.with_preprecessor(Deemphasize);
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book.build()
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}
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fn main() {
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if args_os().count() != 2 {
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eprintln!("USAGE: {} <book>", args().next().expect("executable"));
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return;
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}
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if let Err(e) = do_it(args_os().skip(1).next().expect("one argument")) {
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eprintln!("{}", e);
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process::exit(1);
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}
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}
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impl Deemphasize {
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fn remove_emphasis(num_removed_items: &mut i32, chapter: &mut Chapter) -> Result<String> {
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let mut buf = String::with_capacity(chapter.content.len());
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let events = Parser::new(&chapter.content).filter(|e| {
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let should_keep = match *e {
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Event::Start(Tag::Emphasis)
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| Event::Start(Tag::Strong)
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| Event::End(Tag::Emphasis)
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| Event::End(Tag::Strong) => false,
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_ => true,
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};
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if !should_keep {
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*num_removed_items += 1;
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}
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should_keep
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});
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cmark(events, &mut buf, None)
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.map(|_| buf)
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.map_err(|err| Error::from(format!("Markdown serialization failed: {}", err)))
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}
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}
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