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extern crate regex;
use regex::{Captures, Regex};
use std::collections::HashSet;
use std::io;
use std::io::Read;
fn main() {
let mut buffer = String::new();
if let Err(e) = io::stdin().read_to_string(&mut buffer) {
panic!("{}", e);
}
let mut refs = HashSet::new();
// Capture all links and link references.
let regex =
r"\[([^\]]+)\](?:(?:\[([^\]]+)\])|(?:\([^\)]+\)))(?i)<!--\signore\s-->";
let link_regex = Regex::new(regex).unwrap();
let first_pass = link_regex.replace_all(&buffer, |caps: &Captures<'_>| {
// Save the link reference we want to delete.
if let Some(reference) = caps.get(2) {
refs.insert(reference.as_str().to_string());
}
// Put the link title back.
caps.get(1).unwrap().as_str().to_string()
});
// Search for the references we need to delete.
let ref_regex = Regex::new(r"(?m)^\[([^\]]+)\]:\s.*\n").unwrap();
let out = ref_regex.replace_all(&first_pass, |caps: &Captures<'_>| {
let capture = caps.get(1).unwrap().to_owned();
// Check if we've marked this reference for deletion ...
if refs.contains(capture.as_str()) {
return "".to_string();
}
// ... else we put back everything we captured.
caps.get(0).unwrap().as_str().to_string()
});
print!("{}", out);
}
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