1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97

//! html2pdf
//! Generate a PDF from a local HTML file using a headless chrome

use std::fs;
use std::path::Path;
use std::thread::sleep;
use std::time::Duration;

use headless_chrome::protocol::page::PrintToPdfOptions;
use headless_chrome::{Browser, LaunchOptionsBuilder};
use humantime::format_duration;
use log::{debug, info};

mod cli;

pub use cli::*;

/// Run HTML to PDF with headless_chrome
///
/// # Panics
/// Sorry, no error handling, just panic
pub fn run(opt: CliOptions) {
    let input = fs::canonicalize(opt.input()).unwrap();
    let output = if let Some(out) = opt.output() {
        out.clone()
    } else {
        let mut out = opt.input().clone();
        out.set_extension("pdf");
        out
    };

    let pdf_options = PrintToPdfOptions {
        landscape: Some(opt.landscape()),
        display_header_footer: None,
        print_background: Some(opt.background()),
        scale: None,
        paper_width: None,
        paper_height: None,
        margin_top: None,
        margin_bottom: None,
        margin_left: None,
        margin_right: None,
        page_ranges: None,
        ignore_invalid_page_ranges: None,
        header_template: None,
        footer_template: None,
        prefer_css_page_size: None,
    };

    html_to_pdf(input, output, pdf_options, opt.wait());
}

/// Run HTML to PDF with headless_chrome
///
/// # Panics
/// Sorry, no error handling, just panic
pub fn html_to_pdf<I, O>(
    input: I,
    output: O,
    pdf_options: PrintToPdfOptions,
    wait: Option<Duration>,
) where
    I: AsRef<Path>,
    O: AsRef<Path>,
{
    let input = format!("file://{}", input.as_ref().as_os_str().to_str().unwrap());
    info!("Input file: {}", input);

    let local_pdf = print_to_pdf(&input, pdf_options, wait);

    info!("Output file: {:?}", output.as_ref());
    fs::write(output, &local_pdf).unwrap();
}

fn print_to_pdf(
    file_path: &str,
    pdf_options: PrintToPdfOptions,
    wait: Option<Duration>,
) -> Vec<u8> {
    let options = LaunchOptionsBuilder::default().build().unwrap();
    let browser = Browser::new(options).unwrap();
    let tab = browser.wait_for_initial_tab().unwrap();

    let tab = tab
        .navigate_to(file_path)
        .unwrap()
        .wait_until_navigated()
        .unwrap();

    if let Some(wait) = wait {
        info!("Waiting {} before export to PDF", format_duration(wait));
        sleep(wait);
    }

    debug!("Using PDF options: {:?}", pdf_options);
    tab.print_to_pdf(Some(pdf_options)).unwrap()
}