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use pulldown_cmark::{html, CowStr, Event, LinkType, Options, Parser, Tag};
use regex::RegexBuilder;
use std::io::Write;
/// This example demonstrates how to normalize the href of a wikilink. The
/// details of this implementation can be tweaked for different use cases.
fn main() {
let markdown_input: &str = r#"
Example provided by [[https://example.org/]].
Some people might prefer the wikilink syntax for autolinks.
Wanna go for a [[Wiki Walk]]?"#;
let parser = Parser::new_ext(markdown_input, Options::ENABLE_WIKILINKS).map(|event| {
if let Event::Start(Tag::Link {
link_type: LinkType::WikiLink { has_pothole },
dest_url,
title,
id,
}) = event
{
let new_link = normalize_wikilink(dest_url);
Event::Start(Tag::Link {
link_type: LinkType::WikiLink { has_pothole },
dest_url: new_link,
title,
id,
})
} else {
event
}
});
// Write to anything implementing the `Write` trait. This could also be a file
// or network socket.
let stdout = std::io::stdout();
let mut handle = stdout.lock();
handle.write_all(b"\nHTML output:\n").unwrap();
html::write_html_io(&mut handle, parser).unwrap();
}
/// Performs wikilink normalization.
fn normalize_wikilink(link: CowStr) -> CowStr {
// your wiki is stored at "/wiki"
let prefix: &str = "/wiki";
if link.is_empty() {
return link;
}
// check if the link is absolute, if it is, return as is
// according to RFC 3986; https://www.rfc-editor.org/rfc/rfc3986
let is_absolute = RegexBuilder::new("^(?:[a-z][a-z0-9+\\-.]*:)?//")
.case_insensitive(true)
.build()
.expect("valid regex");
if is_absolute.is_match(&link) {
return link;
}
let mut result = String::with_capacity(link.len() + 2);
let mut i = 0;
let mut mark = 0;
let mut in_whitespace = false;
result.push_str(prefix);
if !link.starts_with('/') {
result.push('/');
}
while i < link.len() {
if !in_whitespace && link.as_bytes()[i].is_ascii_whitespace() {
in_whitespace = true;
result.push_str(&link[mark..i]);
} else if in_whitespace && !link.as_bytes()[i].is_ascii_whitespace() {
result.push('_');
mark = i;
in_whitespace = false;
}
i += 1;
}
if !in_whitespace {
result.push_str(&link[mark..]);
}
if !result.ends_with('/') {
result.push('/');
}
result.into()
}
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