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use std::fmt::Write as _;
use std::fs::{create_dir_all, read_to_string, File};
use std::io::prelude::*;
use std::path::Path;
use rustc_span::edition::Edition;
use rustc_span::source_map::DUMMY_SP;
use crate::config::{Options, RenderOptions};
use crate::doctest::{Collector, GlobalTestOptions};
use crate::html::escape::Escape;
use crate::html::markdown;
use crate::html::markdown::{
find_testable_code, ErrorCodes, HeadingOffset, IdMap, Markdown, MarkdownWithToc,
};
/// Separate any lines at the start of the file that begin with `# ` or `%`.
fn extract_leading_metadata(s: &str) -> (Vec<&str>, &str) {
let mut metadata = Vec::new();
let mut count = 0;
for line in s.lines() {
if line.starts_with("# ") || line.starts_with('%') {
// trim the whitespace after the symbol
metadata.push(line[1..].trim_start());
count += line.len() + 1;
} else {
return (metadata, &s[count..]);
}
}
// if we're here, then all lines were metadata `# ` or `%` lines.
(metadata, "")
}
/// Render `input` (e.g., "foo.md") into an HTML file in `output`
/// (e.g., output = "bar" => "bar/foo.html").
///
/// Requires session globals to be available, for symbol interning.
pub(crate) fn render<P: AsRef<Path>>(
input: P,
options: RenderOptions,
edition: Edition,
) -> Result<(), String> {
if let Err(e) = create_dir_all(&options.output) {
return Err(format!("{}: {}", options.output.display(), e));
}
let input = input.as_ref();
let mut output = options.output;
output.push(input.file_name().unwrap());
output.set_extension("html");
let mut css = String::new();
for name in &options.markdown_css {
write!(css, r#"<link rel="stylesheet" type="text/css" href="{name}">"#)
.expect("Writing to a String can't fail");
}
let input_str = read_to_string(input).map_err(|err| format!("{}: {}", input.display(), err))?;
let playground_url = options.markdown_playground_url.or(options.playground_url);
let playground = playground_url.map(|url| markdown::Playground { crate_name: None, url });
let mut out = File::create(&output).map_err(|e| format!("{}: {}", output.display(), e))?;
let (metadata, text) = extract_leading_metadata(&input_str);
if metadata.is_empty() {
return Err("invalid markdown file: no initial lines starting with `# ` or `%`".to_owned());
}
let title = metadata[0];
let mut ids = IdMap::new();
let error_codes = ErrorCodes::from(options.unstable_features.is_nightly_build());
let text = if !options.markdown_no_toc {
MarkdownWithToc(text, &mut ids, error_codes, edition, &playground).into_string()
} else {
Markdown {
content: text,
links: &[],
ids: &mut ids,
error_codes,
edition,
playground: &playground,
heading_offset: HeadingOffset::H1,
}
.into_string()
};
let err = write!(
&mut out,
r#"<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="generator" content="rustdoc">
<title>{title}</title>
{css}
{in_header}
</head>
<body class="rustdoc">
<!--[if lte IE 8]>
<div class="warning">
This old browser is unsupported and will most likely display funky
things.
</div>
<![endif]-->
{before_content}
<h1 class="title">{title}</h1>
{text}
{after_content}
</body>
</html>"#,
title = Escape(title),
css = css,
in_header = options.external_html.in_header,
before_content = options.external_html.before_content,
text = text,
after_content = options.external_html.after_content,
);
match err {
Err(e) => Err(format!("cannot write to `{}`: {}", output.display(), e)),
Ok(_) => Ok(()),
}
}
/// Runs any tests/code examples in the markdown file `input`.
pub(crate) fn test(options: Options) -> Result<(), String> {
let input_str = read_to_string(&options.input)
.map_err(|err| format!("{}: {}", options.input.display(), err))?;
let mut opts = GlobalTestOptions::default();
opts.no_crate_inject = true;
let mut collector = Collector::new(
options.input.display().to_string(),
options.clone(),
true,
opts,
None,
Some(options.input),
options.enable_per_target_ignores,
);
collector.set_position(DUMMY_SP);
let codes = ErrorCodes::from(options.unstable_features.is_nightly_build());
find_testable_code(&input_str, &mut collector, codes, options.enable_per_target_ignores, None);
crate::doctest::run_tests(options.test_args, options.nocapture, collector.tests);
Ok(())
}
|
