summaryrefslogtreecommitdiffstats
path: root/src/librustdoc/markdown.rs
blob: b661ced01691788a4c7b46bd0a18aefefa035069 (plain)
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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
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::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!("{output}: {e}", output = options.output.display()));
    }

    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" href="{name}">"#)
            .expect("Writing to a String can't fail");
    }

    let input_str =
        read_to_string(input).map_err(|err| format!("{input}: {err}", input = input.display()))?;
    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}: {e}", output = output.display()))?;

    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 {
            content: text,
            ids: &mut ids,
            error_codes,
            edition,
            playground: &playground,
            // For markdown files, it'll be disabled until the feature is enabled by default.
            custom_code_classes_in_docs: false,
        }
        .into_string()
    } else {
        Markdown {
            content: text,
            links: &[],
            ids: &mut ids,
            error_codes,
            edition,
            playground: &playground,
            heading_offset: HeadingOffset::H1,
            // For markdown files, it'll be disabled until the feature is enabled by default.
            custom_code_classes_in_docs: false,
        }
        .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}`: {e}", output = output.display())),
        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!("{input}: {err}", input = options.input.display()))?;
    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());

    // For markdown files, custom code classes will be disabled until the feature is enabled by default.
    find_testable_code(
        &input_str,
        &mut collector,
        codes,
        options.enable_per_target_ignores,
        None,
        false,
    );

    crate::doctest::run_tests(options.test_args, options.nocapture, collector.tests);
    Ok(())
}