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// Copyright (c) 2021 Teddy Wing
//
// This file is part of PDF Form Replace Font.
//
// PDF Form Replace Font is free software: you can redistribute it
// and/or modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// PDF Form Replace Font is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with PDF Form Replace Font. If not, see
// <https://www.gnu.org/licenses/>.
use anyhow::{self, Context};
use exitcode;
use getopts::Options;
use lopdf::{Document, Object};
use std::env;
use std::process;
const PDF_TEXT_FIELD_DEFAULT_APPEARANCE_KEY: &'static str = "DA";
fn main() {
match run() {
Ok(_) => (),
Err(e) => {
eprintln!("error: {}", e);
process::exit(exitcode::SOFTWARE);
},
};
}
fn run () -> Result<(), anyhow::Error> {
let args: Vec<String> = env::args().collect();
let mut opts = Options::new();
opts.optopt("f", "find", "original font", "");
opts.optopt("r", "replace", "replacement font", "");
opts.optopt("o", "output", "output file", "FILE");
opts.optflag("h", "help", "print this help menu");
opts.optflag("V", "version", "show the program version");
let opt_matches = opts.parse(&args[1..])?;
if opt_matches.opt_present("h") {
print!(
"{}",
opts.usage("usage: pdf-form-replace-font --fill ORIGINAL_FONT --replace REPLACEMENT_FONT [-o FILE] [PDF_FILE]"),
);
process::exit(exitcode::USAGE);
}
if opt_matches.opt_present("V") {
println!("{}", env!("CARGO_PKG_VERSION"));
process::exit(exitcode::OK);
}
let input_pdf = if opt_matches.free.is_empty() {
"-"
} else {
&opt_matches.free[0]
};
let find = opt_matches.opt_str("find")
.ok_or(anyhow::anyhow!("required option 'find' missing"))?;
let replace = opt_matches.opt_str("replace")
.ok_or(anyhow::anyhow!("required option 'replace' missing"))?;
let output_pdf = opt_matches.opt_str("output")
.unwrap_or("-".to_owned());
let mut doc = if input_pdf == "=" {
Document::load_from(&mut std::io::stdin())
.context("failed reading from stdin")?
} else {
Document::load(input_pdf)
.with_context(|| format!("failed to read PDF '{}'", input_pdf))?
};
for (_, mut obj) in &mut doc.objects {
match &mut obj {
Object::Dictionary(ref mut d) => {
for (k, v) in d.iter_mut() {
let key = std::str::from_utf8(k)
.context("unable to convert PDF object key to UTF-8")?;
if key == PDF_TEXT_FIELD_DEFAULT_APPEARANCE_KEY {
let properties = v.as_str_mut()
.context("unable to get properties of form field")?;
let new_properties = std::str::from_utf8(properties)
.context("unable to convert form field properties to UTF-8")?
.replace(&find, &replace);
*properties = new_properties.into_bytes();
}
}
},
_ => (),
}
}
if output_pdf == "-" {
doc.save_to(&mut std::io::stdout())
.context("failed writing to stdout")?;
} else {
doc.save(&output_pdf)
.with_context(|| format!("failed to write PDF '{}'", output_pdf))?;
}
Ok(())
}
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