mirror of https://github.com/hamaluik/mkbook
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212 lines
6.9 KiB
Rust
212 lines
6.9 KiB
Rust
use std::path::PathBuf;
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use std::{fs, io};
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use serde::Deserialize;
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pub const STYLESHEET: &'static str = include_str!(concat!(env!("OUT_DIR"), "/style.css"));
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pub const TEMPLATE_PAGE: &'static str = include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/templates/page.hbs"));
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pub const ASSET_FAVICON: &'static [u8] = include_bytes!(concat!(env!("CARGO_MANIFEST_DIR"), "/assets/favicon.ico"));
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mod cli;
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#[derive(Deserialize, Default)]
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struct Metadata {
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title: Option<String>,
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}
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fn format_code(lang: &str, src: &str) -> Result<String, Box<dyn std::error::Error>> {
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use syntect::parsing::{SyntaxSet, SyntaxReference};
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use syntect::highlighting::{ThemeSet};
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use syntect::html::highlighted_html_for_string;
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let ss = SyntaxSet::load_defaults_newlines();
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let ts = ThemeSet::load_defaults();
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let theme = &ts.themes["base16-eighties.dark"];
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let syntax: Option<&SyntaxReference> = if lang.len() > 0 {
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let syntax = ss.find_syntax_by_token(lang);
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if syntax.is_none() {
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eprintln!("warning: language `{}` not recognized, formatting code block as plain text!", lang);
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}
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syntax
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}
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else {
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None
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};
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let syntax = syntax.unwrap_or(ss.find_syntax_plain_text());
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let html = highlighted_html_for_string(src, &ss, &syntax, &theme);
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Ok(html)
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}
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fn extract_metadata(src: &str) -> Result<(Option<Metadata>, String), Box<dyn std::error::Error>> {
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if src.starts_with("---\n") {
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let slice = &src[4..];
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let end = slice.find("---\n");
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if end.is_none() {
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return Ok((None, src.to_owned()));
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}
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let end = end.unwrap();
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let metadata = &slice[..end];
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let contents = &slice[end+4..];
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let metadata: Metadata = toml::from_str(metadata)?;
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Ok((Some(metadata), contents.to_owned()))
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}
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else if src.starts_with("---\r\n") {
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let slice = &src[5..];
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let end = slice.find("---\r\n");
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if end.is_none() {
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return Ok((None, src.to_owned()));
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}
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let end = end.unwrap();
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let metadata = &slice[..end];
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let contents = &slice[end+5..];
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let metadata: Metadata = toml::from_str(metadata)?;
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Ok((Some(metadata), contents.to_owned()))
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}
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else {
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Ok((None, src.to_owned()))
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}
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}
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fn format_markdown(src: &str) -> Result<String, Box<dyn std::error::Error>> {
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use comrak::{Arena, parse_document, format_html, ComrakOptions};
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use comrak::nodes::{AstNode, NodeValue};
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let options: ComrakOptions = ComrakOptions {
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hardbreaks: false,
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smart: true,
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github_pre_lang: true,
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default_info_string: Some("none".to_owned()),
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unsafe_: true,
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ext_strikethrough: true,
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ext_tagfilter: false,
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ext_table: true,
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ext_autolink: true,
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ext_tasklist: true,
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ext_superscript: true,
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ext_header_ids: Some("header".to_owned()),
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ext_footnotes: true,
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ext_description_lists: true,
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..ComrakOptions::default()
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};
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let arena = Arena::new();
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let root = parse_document(
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&arena,
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src,
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&options);
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fn iter_nodes<'a, F>(node: &'a AstNode<'a>, f: &F) -> Result<(), Box<dyn std::error::Error>>
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where F : Fn(&'a AstNode<'a>) -> Result<(), Box<dyn std::error::Error>> {
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f(node)?;
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for c in node.children() {
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iter_nodes(c, f)?;
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}
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Ok(())
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}
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iter_nodes(root, &|node| {
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let value = &mut node.data.borrow_mut().value;
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if let NodeValue::CodeBlock(ref block) = value {
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let lang = String::from_utf8(block.info.clone()).expect("code lang is utf-8");
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let source = String::from_utf8(block.literal.clone()).expect("source code is utf-8");
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let highlighted: String = format_code(&lang, &source)?;
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let highlighted: Vec<u8> = Vec::from(highlighted.into_bytes());
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*value = NodeValue::HtmlBlock(comrak::nodes::NodeHtmlBlock {
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literal: highlighted,
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block_type: 0,
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});
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}
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Ok(())
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})?;
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let mut output: Vec<u8> = Vec::with_capacity((src.len() as f64 * 1.2) as usize);
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format_html(root, &options, &mut output).expect("can format HTML");
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let output = String::from_utf8(output).expect("valid utf-8 generated HTML");
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Ok(output)
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}
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fn format_page<W: io::Write>(metadata: Option<Metadata>, content: &str, output: W) -> Result<(), Box<dyn std::error::Error>> {
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use handlebars::Handlebars;
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// create the handlebars registry
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let mut handlebars = Handlebars::new();
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// register the template. The template string will be verified and compiled.
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handlebars.register_template_string("page", TEMPLATE_PAGE).expect("page is valid template");
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// generate our context
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use std::collections::BTreeMap;
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let mut data = BTreeMap::new();
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data.insert("content", content);
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let metadata = metadata.unwrap_or_default();
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let title = metadata.title.unwrap_or_default();
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data.insert("title", &title);
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// and render
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handlebars.render_to_write("page", &data, output)?;
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Ok(())
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}
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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let matches = cli::build_cli().get_matches();
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if let Some(_submatches) = matches.subcommand_matches("init") {
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unimplemented!()
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}
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else if let Some(submatches) = matches.subcommand_matches("build") {
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let prefix = if let Some(directory) = submatches.value_of("directory") {
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PathBuf::from(directory)
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}
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else {
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PathBuf::from(".")
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};
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let src = prefix.join("src");
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let dest = prefix.join("book");
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std::fs::create_dir_all(&dest)?;
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// compile markdown
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for entry in src.read_dir()? {
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let entry = entry?;
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let path = entry.path();
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if let Some("md") = path.extension().map(std::ffi::OsStr::to_str).flatten() {
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let name = path.file_stem().map(std::ffi::OsStr::to_str).flatten();
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if name.is_none() { continue; }
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let name = name.unwrap();
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let out = dest.join(format!("{}.html", name));
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let outfile = fs::File::create(&out)?;
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let outfile = io::BufWriter::new(outfile);
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let contents = fs::read_to_string(&path)?;
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let (meta, contents) = extract_metadata(&contents)?;
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let contents = format_markdown(&contents)?;
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format_page(meta, &contents, outfile)?;
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println!("Rendered `{}` into `{}`", path.display(), out.display());
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}
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}
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// save the assets
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fs::write(dest.join("style.css"), STYLESHEET)?;
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println!("Wrote {}", dest.join("style.css").display());
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fs::write(dest.join("favicon.ico"), ASSET_FAVICON)?;
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println!("Wrote {}", dest.join("favicon.ico").display());
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println!("Done!");
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Ok(())
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}
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else {
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cli::build_cli().print_long_help()?;
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Ok(())
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}
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}
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