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Add chromium based pdf support

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Signed-off-by: trivernis <trivernis@protonmail.com>
pull/2/head
trivernis 4 years ago
parent 72d0e0a215
commit 2f16c69c39
Signed by: Trivernis
GPG Key ID: DFFFCC2C7A02DB45
10 changed files with 704 additions and 294 deletions
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522
Cargo.lock generated
Unescape Escape View File

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"checksum websocket 0.23.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b255b190f412e45000c35be7fe9b48b39a2ac5eb90d093d421694e5dae8b335c"
"checksum which 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b57acb10231b9493c8472b20cb57317d0679a49e0bdbee44b3b803a6473af164"
"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
"checksum winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
"checksum winapi-util 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
"checksum winreg 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "b2986deb581c4fe11b621998a5e53361efe6b48a151178d0cd9eeffa4dc6acc9"
"checksum winreg 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0120db82e8a1e0b9fb3345a539c478767c0048d842860994d96113d5b667bd69"
"checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
"checksum xml-rs 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)" = "b07db065a5cf61a7e4ba64f29e67db906fb1787316516c4e6e5ff0fea1efcd8a"

2
Cargo.toml
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@ -44,3 +44,5 @@ log = "0.4.11"
env_logger = "0.7.1"
indicatif = "0.15.0"
platform-dirs = "0.2.0"
headless_chrome = "0.9.0"
failure = "0.1.8"

119
src/format/chromium_pdf/mod.rs
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@ -0,0 +1,119 @@
use crate::elements::Document;
use crate::format::chromium_pdf::result::{PdfRenderingError, PdfRenderingResult};
use crate::format::html::html_writer::HTMLWriter;
use crate::format::html::to_html::ToHtml;
use crate::references::configuration::keys::INCLUDE_MATHJAX;
use crate::utils::downloads::get_cached_path;
use headless_chrome::protocol::page::PrintToPdfOptions;
use headless_chrome::{Browser, LaunchOptionsBuilder, Tab};
use std::error::Error;
use std::fs::{File, OpenOptions};
use std::io;
use std::io::BufWriter;
use std::path::PathBuf;
use std::sync::{Arc, Mutex};
use std::thread;
use std::time::{Duration, Instant};
pub mod result;
/// Renders the document to pdf and returns the resulting bytes
pub fn render_to_pdf(document: Document) -> PdfRenderingResult<Vec<u8>> {
let mut file_path = PathBuf::from("tmp-document.html");
file_path = get_cached_path(file_path).with_extension("html");
let mut mathjax = false;
if let Some(entry) = document.config.get_entry(INCLUDE_MATHJAX) {
if entry.get().as_bool() == Some(true) {
mathjax = true;
}
}
let handle = thread::spawn({
let file_path = file_path.clone();
move || {
log::debug!("Rendering html...");
let writer = BufWriter::new(
OpenOptions::new()
.create(true)
.write(true)
.open(file_path)?,
);
let mut html_writer = HTMLWriter::new(Box::new(writer));
document.to_html(&mut html_writer);
log::debug!("Successfully rendered temporary html file!");
html_writer.flush()
}
});
log::debug!("Starting browser...");
let browser = Browser::new(LaunchOptionsBuilder::default().build().unwrap())?;
let tab = browser.wait_for_initial_tab()?;
handle.join().unwrap()?;
tab.navigate_to(format!("file:///{}", file_path.to_string_lossy()).as_str())?;
tab.wait_until_navigated()?;
if mathjax {
wait_for_mathjax(&tab, Duration::from_secs(60))?;
}
let result = tab.print_to_pdf(Some(get_pdf_options()))?;
Ok(result)
}
/// Waits for mathjax to be finished
fn wait_for_mathjax(tab: &Tab, timeout: Duration) -> PdfRenderingResult<()> {
let start = Instant::now();
log::debug!("Waiting for mathjax...");
loop {
let result = tab
.evaluate(
"\
if (window.MathJax)\
!!window.MathJax;\
else \
false;\
",
true,
)?
.value;
match result {
Some(value) => {
if value.is_boolean() && value.as_bool().unwrap() == true {
break;
} else {
if start.elapsed() >= timeout {
return Err(PdfRenderingError::Timeout);
}
thread::sleep(Duration::from_millis(10))
}
}
None => {
if start.elapsed() >= timeout {
return Err(PdfRenderingError::Timeout);
}
thread::sleep(Duration::from_millis(10))
}
}
}
Ok(())
}
fn get_pdf_options() -> PrintToPdfOptions {
PrintToPdfOptions {
landscape: None,
display_header_footer: Some(false),
print_background: Some(true),
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,
}
}

38
src/format/chromium_pdf/result.rs
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@ -0,0 +1,38 @@
use serde::export::fmt::{self, Display};
use std::error::Error;
use std::io;
pub type PdfRenderingResult<T> = Result<T, PdfRenderingError>;
#[derive(Debug)]
pub enum PdfRenderingError {
IoError(io::Error),
ChromiumError(failure::Error),
Timeout,
HtmlRenderingError,
}
impl Display for PdfRenderingError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
PdfRenderingError::IoError(e) => write!(f, "IO Error: {}", e),
PdfRenderingError::Timeout => write!(f, "Rendering timed out"),
PdfRenderingError::ChromiumError(e) => write!(f, "Chromium Error: {}", e),
PdfRenderingError::HtmlRenderingError => write!(f, "Failed to render html"),
}
}
}
impl Error for PdfRenderingError {}
impl From<failure::Error> for PdfRenderingError {
fn from(other: failure::Error) -> Self {
Self::ChromiumError(other)
}
}
impl From<io::Error> for PdfRenderingError {
fn from(other: io::Error) -> Self {
Self::IoError(other)
}
}

136
src/format/epub/assets/style.css
Unescape Escape View File

@ -1,136 +0,0 @@
body {
overflow-x: hidden;
color: #000;
word-break: break-word;
}
.content {
font-family: "Fira Sans", "Noto Sans", SansSerif, sans-serif;
margin: auto;
background-color: #FFF;
}
h1 {
font-size: 2.2rem;
}
h2 {
font-size: 1.8rem;
}
h3 {
font-size: 1.4rem;
}
h4 {
font-size: 1rem;
}
h5 {
font-size: 0.8rem;
}
h6 {
font-size: 0.4rem;
}
img {
max-width: 100%;
max-height: 100vh;
height: auto;
}
code {
color: #000;
}
code pre {
font-family: "Fira Code", "Mono", monospace;
padding: 0.8em 0.2em;
background-color: #EEE !important;
border-radius: 0.25em;
}
code.inlineCode {
font-family: "Fira Code", monospace;
border-radius: 0.1em;
background-color: #EEE;
padding: 0 0.1em
}
.tableWrapper {
overflow-x: auto;
width: 100%;
}
.tableWrapper > table {
margin: auto;
}
table {
border-collapse: collapse;
}
table tr:nth-child(odd) {
background-color: #DDD;
}
table tr:nth-child(1) {
background-color: white;
font-weight: bold;
border-bottom: 1px solid black;
}
table td, table th {
border-left: 1px solid black;
padding: 0.2em 0.5em
}
table tr td:first-child, table tr th:first-child {
border-left: none;
}
blockquote {
margin-left: 0;
background-color: rgba(0, 0, 0, 0);
}
.quote {
border-left: 0.3em solid gray;
border-radius: 0.2em;
padding-left: 1em;
margin-left: 0;
background-color: #EEE;
}
.quote .metadata {
font-style: italic;
padding-left: 0.5em;
color: #444
}
.figure {
width: 100%;
display: block;
text-align: center;
}
.figure .imageDescription {
display: block;
color: #444;
font-style: italic;
}
.centered {
text-align: center;
}
.glossaryReference {
text-decoration: none;
color: inherit;
border-bottom: 1px dotted #000;
}
.arrow {
font-family: "Fira Code", "Mono", monospace;
}

154
src/format/epub/to_epub.rs
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@ -1,154 +0,0 @@
use crate::elements::{
Block, Document, Element, Header, Inline, Line, List, ListItem, Paragraph, Section,
};
use crate::format::epub::epub_writer::EpubWriter;
use std::io::Result;
use std::mem;
pub trait ToEpub {
fn to_epub(&self, writer: &mut EpubWriter) -> Result<()>;
}
impl ToEpub for Element {
fn to_epub(&self, writer: &mut EpubWriter) -> Result<()> {
match self {
Element::Inline(inline) => inline.to_epub(writer),
Element::Block(block) => block.to_epub(writer),
Element::Line(line) => line.to_epub(writer),
}
}
}
impl ToEpub for Block {
fn to_epub(&self, writer: &mut EpubWriter) -> Result<()> {
match self {
Block::Null => Ok(()),
Block::Section(s) => s.to_epub(writer),
Block::List(l) => l.to_epub(writer),
Block::Paragraph(p) => p.to_epub(writer),
}
}
}
impl ToEpub for Line {
fn to_epub(&self, writer: &mut EpubWriter) -> Result<()> {
unimplemented!()
}
}
impl ToEpub for Inline {
fn to_epub(&self, writer: &mut EpubWriter) -> Result<()> {
unimplemented!()
}
}
impl ToEpub for Document {
fn to_epub(&self, writer: &mut EpubWriter) -> Result<()> {
self.downloads.lock().unwrap().download_all();
let style = minify(std::include_str!("assets/style.css"));
writer.stylesheet(style)?;
for mut stylesheet in self.stylesheets {
let mut sheet = stylesheet.lock().unwrap();
let data = mem::take(&mut sheet.data);
if let Some(data) = data {
let sheet_data = String::from_utf8(data)?;
writer.stylesheet(&sheet_data);
}
}
Ok(())
}
}
impl ToEpub for Section {
fn to_epub(&self, writer: &mut EpubWriter) -> Result<()> {
writer.section(self.header.size, self.header.plain.clone())?;
writer.content("<!DOCTYPE html>".to_string());
writer.content("<html xmlns=\"http://www.w3.org/1999/xhtml\"><body>".to_string());
self.header.to_epub(writer)?;
for element in &self.elements {
element.to_epub(writer)?;
}
writer.content("</body></html>".to_string());
Ok(())
}
}
impl ToEpub for Header {
fn to_epub(&self, writer: &mut EpubWriter) -> Result<()> {
writer.content(format!("<h{} id=\"", self.size));
writer.escaped_attribute_content(self.anchor.clone());
writer.content("\">".to_string());
self.line.to_epub(writer);
writer.content("</h1>".to_string());
Ok(())
}
}
impl ToEpub for List {
fn to_epub(&self, writer: &mut EpubWriter) -> Result<()> {
if self.ordered {
writer.content("<ol>".to_string());
for item in self.items {
item.to_epub(writer);
}
writer.content("</ol>".to_string());
} else {
writer.content("<ul>".to_string());
for item in self.items {
item.to_epub(writer);
}
writer.content("</ul>".to_string());
}
Ok(())
}
}
impl ToEpub for ListItem {
fn to_epub(&self, writer: &mut EpubWriter) -> Result<()> {
writer.content("<li>".to_string());
self.text.to_epub(writer)?;
if let Some(first) = self.children.first() {
if first.ordered {
writer.content("<ol>".to_string());
for item in &self.children {
item.to_epub(writer)?;
}
writer.content("</ol>".to_string());
} else {
writer.content("<ul>".to_string());
for item in &self.children {
item.to_epub(writer)?;
}
writer.content("</ul>".to_string());
}
}
writer.content("</li>".to_string());
Ok(())
}
}
impl ToEpub for Paragraph {
fn to_epub(&self, writer: &mut EpubWriter) -> Result<()> {
writer.content("<div class=\"paragraph\"".to_string());
if let Some(first) = self.elements.first() {
first.to_epub(writer)?;
}
if self.elements.len() > 1 {
for element in &self.elements[1..] {
writer.content("<br/>".to_string());
element.to_epub(writer)?;
}
}
Ok(())
}
}

9
src/format/html/assets/style.css
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@ -138,3 +138,12 @@ blockquote {
.arrow {
font-family: "Fira Code", "Mono", monospace;
}
@media print {
.content > section > section, .content > section > section {
page-break-inside: avoid;
}
body {
background-color: white !important;
}
}

1
src/format/mod.rs
Unescape Escape View File

@ -1,6 +1,7 @@
use regex::Regex;
use std::collections::HashMap;
pub mod chromium_pdf;
pub mod html;
pub struct PlaceholderTemplate {

13
src/main.rs
Unescape Escape View File

@ -2,12 +2,13 @@ use colored::Colorize;
use env_logger::Env;
use log::{Level, LevelFilter};
use notify::{watcher, RecursiveMode, Watcher};
use snekdown::format::chromium_pdf::render_to_pdf;
use snekdown::format::html::html_writer::HTMLWriter;
use snekdown::format::html::to_html::ToHtml;
use snekdown::parser::ParserOptions;
use snekdown::Parser;
use std::fs::OpenOptions;
use std::io::BufWriter;
use std::io::{BufWriter, Write};
use std::path::PathBuf;
use std::sync::mpsc::channel;
use std::time::{Duration, Instant};
@ -114,6 +115,7 @@ fn watch(opt: &Opt) {
/// Renders the document to the output path
fn render(opt: &Opt) -> Parser {
let start = Instant::now();
let mut parser = Parser::with_defaults(
ParserOptions::default()
.add_path(opt.input.clone())
@ -123,6 +125,7 @@ fn render(opt: &Opt) -> Parser {
log::info!("Parsing took: {:?}", start.elapsed());
let start_render = Instant::now();
let file = OpenOptions::new()
.read(true)
.write(true)
@ -130,13 +133,19 @@ fn render(opt: &Opt) -> Parser {
.create(true)
.open(&opt.output)
.unwrap();
let writer = BufWriter::new(file);
let mut writer = BufWriter::new(file);
match opt.format.as_str() {
"html" => {
let mut writer = HTMLWriter::new(Box::new(writer));
document.to_html(&mut writer).unwrap();
writer.flush().unwrap();
}
"pdf" => {
let result = render_to_pdf(document).expect("Failed to render pdf!");
writer.write_all(&result).unwrap();
writer.flush().unwrap();
}
_ => log::error!("Unknown format {}", opt.format),
}
log::info!("Rendering took: {:?}", start_render.elapsed());

2
src/utils/downloads.rs
Unescape Escape View File

@ -129,7 +129,7 @@ impl PendingDownload {
}
}
fn get_cached_path(path: PathBuf) -> PathBuf {
pub fn get_cached_path(path: PathBuf) -> PathBuf {
lazy_static::lazy_static! {
static ref APP_DIRS: AppDirs = AppDirs::new(Some("snekdown"), AppUI::CommandLine).unwrap();
}

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