331 lines
12 KiB
Rust
331 lines
12 KiB
Rust
use pulldown_cmark as cmark;
|
|
use slug::slugify;
|
|
use syntect::easy::HighlightLines;
|
|
use syntect::html::{
|
|
start_highlighted_html_snippet, styled_line_to_highlighted_html, IncludeBackground,
|
|
};
|
|
|
|
use config::highlighting::{get_highlighter, SYNTAX_SET, THEME_SET};
|
|
use context::RenderContext;
|
|
use errors::{Error, Result};
|
|
use front_matter::InsertAnchor;
|
|
use table_of_contents::{make_table_of_contents, Header};
|
|
use utils::site::resolve_internal_link;
|
|
use utils::vec::InsertMany;
|
|
|
|
use self::cmark::{Event, LinkType, Options, Parser, Tag};
|
|
|
|
const CONTINUE_READING: &str =
|
|
"<p id=\"zola-continue-reading\"><a name=\"continue-reading\"></a></p>\n";
|
|
const ANCHOR_LINK_TEMPLATE: &str = "anchor-link.html";
|
|
|
|
#[derive(Debug)]
|
|
pub struct Rendered {
|
|
pub body: String,
|
|
pub summary_len: Option<usize>,
|
|
pub toc: Vec<Header>,
|
|
pub internal_links_with_anchors: Vec<(String, String)>,
|
|
pub external_links: Vec<String>,
|
|
}
|
|
|
|
// tracks a header in a slice of pulldown-cmark events
|
|
#[derive(Debug)]
|
|
struct HeaderRef {
|
|
start_idx: usize,
|
|
end_idx: usize,
|
|
level: i32,
|
|
id: Option<String>,
|
|
}
|
|
|
|
impl HeaderRef {
|
|
fn new(start: usize, level: i32) -> HeaderRef {
|
|
HeaderRef { start_idx: start, end_idx: 0, level, id: None }
|
|
}
|
|
}
|
|
|
|
// We might have cases where the slug is already present in our list of anchor
|
|
// for example an article could have several titles named Example
|
|
// We add a counter after the slug if the slug is already present, which
|
|
// means we will have example, example-1, example-2 etc
|
|
fn find_anchor(anchors: &[String], name: String, level: u8) -> String {
|
|
if level == 0 && !anchors.contains(&name) {
|
|
return name;
|
|
}
|
|
|
|
let new_anchor = format!("{}-{}", name, level + 1);
|
|
if !anchors.contains(&new_anchor) {
|
|
return new_anchor;
|
|
}
|
|
|
|
find_anchor(anchors, name, level + 1)
|
|
}
|
|
|
|
// Colocated asset links refers to the files in the same directory,
|
|
// there it should be a filename only
|
|
fn is_colocated_asset_link(link: &str) -> bool {
|
|
!link.contains('/') // http://, ftp://, ../ etc
|
|
&& !link.starts_with("mailto:")
|
|
}
|
|
|
|
fn fix_link(
|
|
link_type: LinkType,
|
|
link: &str,
|
|
context: &RenderContext,
|
|
internal_links_with_anchors: &mut Vec<(String, String)>,
|
|
external_links: &mut Vec<String>,
|
|
) -> Result<String> {
|
|
if link_type == LinkType::Email {
|
|
return Ok(link.to_string());
|
|
}
|
|
|
|
// TODO: remove me in a few versions when people have upgraded
|
|
if link.starts_with("./") && link.contains(".md") {
|
|
println!("It looks like the link `{}` is using the previous syntax for internal links: start with @/ instead", link);
|
|
}
|
|
|
|
// A few situations here:
|
|
// - it could be a relative link (starting with `@/`)
|
|
// - it could be a link to a co-located asset
|
|
// - it could be a normal link
|
|
let result = if link.starts_with("@/") {
|
|
match resolve_internal_link(&link, context.permalinks) {
|
|
Ok(resolved) => {
|
|
if resolved.anchor.is_some() {
|
|
internal_links_with_anchors
|
|
.push((resolved.md_path.unwrap(), resolved.anchor.unwrap()));
|
|
}
|
|
resolved.permalink
|
|
}
|
|
Err(_) => {
|
|
return Err(format!("Relative link {} not found.", link).into());
|
|
}
|
|
}
|
|
} else if is_colocated_asset_link(&link) {
|
|
format!("{}{}", context.current_page_permalink, link)
|
|
} else {
|
|
if !link.starts_with('#') && !link.starts_with("mailto:") {
|
|
external_links.push(link.to_owned());
|
|
}
|
|
link.to_string()
|
|
};
|
|
Ok(result)
|
|
}
|
|
|
|
/// get only text in a slice of events
|
|
fn get_text(parser_slice: &[Event]) -> String {
|
|
let mut title = String::new();
|
|
|
|
for event in parser_slice.iter() {
|
|
match event {
|
|
Event::Text(text) | Event::Code(text) => title += text,
|
|
_ => continue,
|
|
}
|
|
}
|
|
|
|
title
|
|
}
|
|
|
|
fn get_header_refs(events: &[Event]) -> Vec<HeaderRef> {
|
|
let mut header_refs = vec![];
|
|
|
|
for (i, event) in events.iter().enumerate() {
|
|
match event {
|
|
Event::Start(Tag::Header(level)) => {
|
|
header_refs.push(HeaderRef::new(i, *level));
|
|
}
|
|
Event::End(Tag::Header(_)) => {
|
|
let msg = "Header end before start?";
|
|
header_refs.last_mut().expect(msg).end_idx = i;
|
|
}
|
|
_ => (),
|
|
}
|
|
}
|
|
|
|
header_refs
|
|
}
|
|
|
|
pub fn markdown_to_html(content: &str, context: &RenderContext) -> Result<Rendered> {
|
|
// the rendered html
|
|
let mut html = String::with_capacity(content.len());
|
|
// Set while parsing
|
|
let mut error = None;
|
|
|
|
let mut background = IncludeBackground::Yes;
|
|
let mut highlighter: Option<(HighlightLines, bool)> = None;
|
|
|
|
let mut inserted_anchors: Vec<String> = vec![];
|
|
let mut headers: Vec<Header> = vec![];
|
|
let mut internal_links_with_anchors = Vec::new();
|
|
let mut external_links = Vec::new();
|
|
|
|
let mut opts = Options::empty();
|
|
let mut has_summary = false;
|
|
opts.insert(Options::ENABLE_TABLES);
|
|
opts.insert(Options::ENABLE_FOOTNOTES);
|
|
|
|
{
|
|
let mut events = Parser::new_ext(content, opts)
|
|
.map(|event| {
|
|
match event {
|
|
Event::Text(text) => {
|
|
// if we are in the middle of a code block
|
|
if let Some((ref mut highlighter, in_extra)) = highlighter {
|
|
let highlighted = if in_extra {
|
|
if let Some(ref extra) = context.config.extra_syntax_set {
|
|
highlighter.highlight(&text, &extra)
|
|
} else {
|
|
unreachable!(
|
|
"Got a highlighter from extra syntaxes but no extra?"
|
|
);
|
|
}
|
|
} else {
|
|
highlighter.highlight(&text, &SYNTAX_SET)
|
|
};
|
|
//let highlighted = &highlighter.highlight(&text, ss);
|
|
let html = styled_line_to_highlighted_html(&highlighted, background);
|
|
return Event::Html(html.into());
|
|
}
|
|
|
|
// Business as usual
|
|
Event::Text(text)
|
|
}
|
|
Event::Start(Tag::CodeBlock(ref info)) => {
|
|
if !context.config.highlight_code {
|
|
return Event::Html("<pre><code>".into());
|
|
}
|
|
|
|
let theme = &THEME_SET.themes[&context.config.highlight_theme];
|
|
highlighter = Some(get_highlighter(info, &context.config));
|
|
// This selects the background color the same way that start_coloured_html_snippet does
|
|
let color = theme
|
|
.settings
|
|
.background
|
|
.unwrap_or(::syntect::highlighting::Color::WHITE);
|
|
background = IncludeBackground::IfDifferent(color);
|
|
let snippet = start_highlighted_html_snippet(theme);
|
|
Event::Html(snippet.0.into())
|
|
}
|
|
Event::End(Tag::CodeBlock(_)) => {
|
|
if !context.config.highlight_code {
|
|
return Event::Html("</code></pre>\n".into());
|
|
}
|
|
// reset highlight and close the code block
|
|
highlighter = None;
|
|
Event::Html("</pre>".into())
|
|
}
|
|
Event::Start(Tag::Image(link_type, src, title)) => {
|
|
if is_colocated_asset_link(&src) {
|
|
let link = format!("{}{}", context.current_page_permalink, &*src);
|
|
return Event::Start(Tag::Image(link_type, link.into(), title));
|
|
}
|
|
|
|
Event::Start(Tag::Image(link_type, src, title))
|
|
}
|
|
Event::Start(Tag::Link(link_type, link, title)) => {
|
|
let fixed_link = match fix_link(
|
|
link_type,
|
|
&link,
|
|
context,
|
|
&mut internal_links_with_anchors,
|
|
&mut external_links,
|
|
) {
|
|
Ok(fixed_link) => fixed_link,
|
|
Err(err) => {
|
|
error = Some(err);
|
|
return Event::Html("".into());
|
|
}
|
|
};
|
|
|
|
Event::Start(Tag::Link(link_type, fixed_link.into(), title))
|
|
}
|
|
Event::Html(ref markup) if markup.contains("<!-- more -->") => {
|
|
has_summary = true;
|
|
Event::Html(CONTINUE_READING.into())
|
|
}
|
|
_ => event,
|
|
}
|
|
})
|
|
.collect::<Vec<_>>(); // We need to collect the events to make a second pass
|
|
|
|
let mut header_refs = get_header_refs(&events);
|
|
|
|
let mut anchors_to_insert = vec![];
|
|
|
|
// First header pass: look for a manually-specified IDs, e.g. `# Heading text {#hash}`
|
|
// (This is a separate first pass so that auto IDs can avoid collisions with manual IDs.)
|
|
for header_ref in header_refs.iter_mut() {
|
|
let end_idx = header_ref.end_idx;
|
|
if let Event::Text(ref mut text) = events[end_idx - 1] {
|
|
if text.as_bytes().last() == Some(&b'}') {
|
|
if let Some(mut i) = text.find("{#") {
|
|
let id = text[i + 2..text.len() - 1].to_owned();
|
|
inserted_anchors.push(id.clone());
|
|
while i > 0 && text.as_bytes()[i - 1] == b' ' {
|
|
i -= 1;
|
|
}
|
|
header_ref.id = Some(id);
|
|
*text = text[..i].to_owned().into();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Second header pass: auto-generate remaining IDs, and emit HTML
|
|
for header_ref in header_refs {
|
|
let start_idx = header_ref.start_idx;
|
|
let end_idx = header_ref.end_idx;
|
|
let title = get_text(&events[start_idx + 1..end_idx]);
|
|
let id =
|
|
header_ref.id.unwrap_or_else(|| find_anchor(&inserted_anchors, slugify(&title), 0));
|
|
inserted_anchors.push(id.clone());
|
|
|
|
// insert `id` to the tag
|
|
let html = format!("<h{lvl} id=\"{id}\">", lvl = header_ref.level, id = id);
|
|
events[start_idx] = Event::Html(html.into());
|
|
|
|
// generate anchors and places to insert them
|
|
if context.insert_anchor != InsertAnchor::None {
|
|
let anchor_idx = match context.insert_anchor {
|
|
InsertAnchor::Left => start_idx + 1,
|
|
InsertAnchor::Right => end_idx,
|
|
InsertAnchor::None => 0, // Not important
|
|
};
|
|
let mut c = tera::Context::new();
|
|
c.insert("id", &id);
|
|
|
|
let anchor_link = utils::templates::render_template(
|
|
&ANCHOR_LINK_TEMPLATE,
|
|
context.tera,
|
|
c,
|
|
&None,
|
|
)
|
|
.map_err(|e| Error::chain("Failed to render anchor link template", e))?;
|
|
anchors_to_insert.push((anchor_idx, Event::Html(anchor_link.into())));
|
|
}
|
|
|
|
// record header to make table of contents
|
|
let permalink = format!("{}#{}", context.current_page_permalink, id);
|
|
let h = Header { level: header_ref.level, id, permalink, title, children: Vec::new() };
|
|
headers.push(h);
|
|
}
|
|
|
|
if context.insert_anchor != InsertAnchor::None {
|
|
events.insert_many(anchors_to_insert);
|
|
}
|
|
|
|
cmark::html::push_html(&mut html, events.into_iter());
|
|
}
|
|
|
|
if let Some(e) = error {
|
|
Err(e)
|
|
} else {
|
|
Ok(Rendered {
|
|
summary_len: if has_summary { html.find(CONTINUE_READING) } else { None },
|
|
body: html,
|
|
toc: make_table_of_contents(headers),
|
|
internal_links_with_anchors,
|
|
external_links,
|
|
})
|
|
}
|
|
}
|