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use std::fmt::Debug;
use std::fs::File;
use std::io::{Error, ErrorKind, Write};
use std::path::{Path, PathBuf};
use std::time::Instant;
use clap::Parser;
use lopdf::{Document, Object};
use serde_json;
use shellexpand;
#[cfg(feature = "async")]
use tokio::runtime::Builder;
static IGNORE: &[&str] = &[
"Length",
"BBox",
"FormType",
"Matrix",
"Resources",
"Type",
"XObject",
"Subtype",
"Filter",
"ColorSpace",
"Width",
"Height",
"BitsPerComponent",
"Length1",
"Length2",
"Length3",
"PTEX.FileName",
"PTEX.PageNumber",
"PTEX.InfoDict",
"FontDescriptor",
"ExtGState",
"Font",
"MediaBox",
"Annot",
];
#[derive(Parser, Debug)]
#[clap(
author,
version,
about,
long_about = "Extract TOC and write to file.",
arg_required_else_help = true
)]
pub struct Args {
pub pdf_path: PathBuf,
/// Optional output directory. If omitted the directory of the PDF file will be used.
#[clap(short, long)]
pub output: Option<PathBuf>,
/// Optional pretty print output.
#[clap(short, long)]
pub pretty: bool,
}
impl Args {
pub fn parse_args() -> Self {
Args::parse()
}
}
fn filter_func(object_id: (u32, u16), object: &mut Object) -> Option<((u32, u16), Object)> {
if IGNORE.contains(&object.type_name().unwrap_or_default()) {
return None;
}
if let Ok(d) = object.as_dict_mut() {
d.remove(b"Font");
d.remove(b"Resources");
d.remove(b"Producer");
d.remove(b"ModDate");
d.remove(b"Creator");
d.remove(b"ProcSet");
d.remove(b"XObject");
d.remove(b"MediaBox");
d.remove(b"Annots");
if d.is_empty() {
return None;
}
}
Some((object_id, object.to_owned()))
}
#[cfg(not(feature = "async"))]
fn load_pdf<P: AsRef<Path>>(path: P) -> Result<Document, Error> {
Document::load_filtered(path, filter_func).map_err(|e| Error::new(ErrorKind::Other, e.to_string()))
}
#[cfg(feature = "async")]
fn load_pdf<P: AsRef<Path>>(path: P) -> Result<Document, Error> {
Ok(Builder::new_current_thread().build().unwrap().block_on(async move {
Document::load_filtered(path, filter_func)
.await
.map_err(|e| Error::new(ErrorKind::Other, e.to_string()))
})?)
}
fn pdf2toc<P: AsRef<Path> + Debug>(path: P, output: P, pretty: bool) -> Result<(), Error> {
println!("Load {path:?}");
let doc = load_pdf(&path)?;
if doc.is_encrypted() {
return Err(Error::new(ErrorKind::InvalidInput, "Password missing!"));
}
let toc = doc.get_toc().map_err(|e| Error::new(ErrorKind::Other, e.to_string()))?;
if !toc.errors.is_empty() {
eprintln!("{path:?} has {} errors:", toc.errors.len());
for error in &toc.errors[..10] {
eprintln!("{error:?}");
}
}
let data = match pretty {
true => serde_json::to_string_pretty(&toc).unwrap(),
false => serde_json::to_string(&toc).unwrap(),
};
println!("Write {output:?}");
let mut f = File::create(output)?;
f.write_all(data.as_bytes())?;
Ok(())
}
fn main() -> Result<(), Error> {
let args = Args::parse_args();
let start_time = Instant::now();
let pdf_path = PathBuf::from(shellexpand::full(args.pdf_path.to_str().unwrap()).unwrap().to_string());
let output = match args.output {
Some(o) => o.join(pdf_path.file_name().unwrap()),
None => args.pdf_path,
};
let mut output = PathBuf::from(shellexpand::full(output.to_str().unwrap()).unwrap().to_string());
output.set_extension("toc");
pdf2toc(&pdf_path, &output, args.pretty)?;
println!(
"Done after {:.1} seconds.",
Instant::now().duration_since(start_time).as_secs_f64()
);
Ok(())
}
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