feat(cheddar): Add Sourcegraph-compatible highlighting server

Sourcegraph uses a component called syntect_server to syntax-highlight
source files.

Since we already have custom syntaxes, overrides and configuration we
might as well use them with Sourcegraph!

This implements the syntect_server "protocol" (it's just a single
endpoint) so that we can swap out the syntect_server component with
cheddar.

Note: There's a few clippy lints here, but they're being solved in a
followup commit because I wanted to take care of all of them at
once (not just the ones introduced in this change).

Change-Id: Ib518a2fa1b9fee299fe599482403599583cac479
Reviewed-on: https://cl.tvl.fyi/c/depot/+/509
Reviewed-by: lukegb <lukegb@tvl.fyi>
This commit is contained in:
Vincent Ambo 2020-06-20 02:57:31 +01:00 committed by tazjin
parent b8251556c6
commit e27b0a3013
3 changed files with 765 additions and 51 deletions

673
tools/cheddar/Cargo.lock generated
View file

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View file

@ -5,7 +5,13 @@ authors = ["Vincent Ambo <mail@tazj.in>"]
edition = "2018"
[dependencies]
clap = "2.33"
comrak = "0.7"
lazy_static = "1.4"
rouille = "3.0"
syntect = "4.2.0"
clap = "2.33"
serde_json = "1.0"
[dependencies.serde]
version = "1.0"
features = [ "derive" ]

View file

@ -3,6 +3,9 @@ use comrak::arena_tree::Node;
use comrak::nodes::{Ast, AstNode, NodeCodeBlock, NodeHtmlBlock, NodeValue};
use comrak::{format_html, parse_document, Arena, ComrakOptions};
use lazy_static::lazy_static;
use rouille::try_or_400;
use rouille::Response;
use serde::Deserialize;
use std::cell::RefCell;
use std::collections::HashMap;
use std::env;
@ -13,9 +16,10 @@ use std::io::Write;
use std::path::Path;
use syntect::dumps::from_binary;
use syntect::easy::HighlightLines;
use syntect::highlighting::ThemeSet;
use syntect::highlighting::{Theme, ThemeSet};
use syntect::parsing::{SyntaxReference, SyntaxSet};
use syntect::util::LinesWithEndings;
use serde_json::json;
use syntect::html::{
append_highlighted_html_for_styled_line, start_highlighted_html_snippet, IncludeBackground,
@ -58,19 +62,6 @@ lazy_static! {
// Emulates the GitHub style (subtle background hue and padding).
const BLOCK_PRE: &str = "<pre style=\"background-color:#f6f8fa;padding:16px;\">\n";
#[derive(Debug, Default)]
struct Args {
/// Should Cheddar run as an about filter? (i.e. give special
/// rendering treatment to Markdown documents)
about_filter: bool,
/// What file extension has been supplied (if any)?
extension: Option<String>,
/// Which language to override the detection to (if any)?
lang_override: Option<&'static str>,
}
fn should_continue(res: &io::Result<usize>) -> bool {
match *res {
Ok(n) => n > 0,
@ -237,24 +228,30 @@ fn format_markdown<R: BufRead, W: Write>(reader: &mut R, writer: &mut W) {
format_html(root, &MD_OPTS, writer).expect("Markdown rendering failed");
}
fn format_code<R: BufRead, W: Write>(reader: &mut R, writer: &mut W, args: &Args) {
fn find_syntax_for_file(filename: &str) -> &'static SyntaxReference {
return (*FILENAME_OVERRIDES)
.get(filename)
.and_then(|name| SYNTAXES.find_syntax_by_name(name))
.or_else(|| {
Path::new(filename)
.extension()
.and_then(OsStr::to_str)
.and_then(|s| SYNTAXES.find_syntax_by_extension(s))
})
.unwrap_or_else(|| SYNTAXES.find_syntax_plain_text());
}
fn format_code<R: BufRead, W: Write>(
theme: &Theme,
reader: &mut R,
writer: &mut W,
filename: &str,
) {
let mut linebuf = String::new();
// Get the first line, we might need it for syntax identification.
let mut read_result = reader.read_line(&mut linebuf);
// Set up the highlighter
let theme = &THEMES.themes["InspiredGitHub"];
let syntax = args
.lang_override
.and_then(|l| SYNTAXES.find_syntax_by_name(l))
.or_else(|| match args.extension {
Some(ref ext) => SYNTAXES.find_syntax_by_extension(ext),
None => None,
})
.or_else(|| SYNTAXES.find_syntax_by_first_line(&linebuf))
.unwrap_or_else(|| SYNTAXES.find_syntax_plain_text());
let syntax = find_syntax_for_file(filename);
let mut hl = HighlightLines::new(syntax, theme);
let (mut outbuf, bg) = start_highlighted_html_snippet(theme);
@ -287,6 +284,46 @@ fn format_code<R: BufRead, W: Write>(reader: &mut R, writer: &mut W, args: &Args
writeln!(writer, "</pre>").expect("write should not fail");
}
// Starts a Sourcegraph-compatible syntax highlighting server. This
// replaces the 'syntect_server' component of Sourcegraph.
fn highlighting_server(listen: &str) {
println!("Starting syntax highlighting server on '{}'", listen);
#[derive(Deserialize)]
struct SourcegraphQuery {
filepath: String,
theme: String,
code: String,
}
// Sourcegraph only uses a single endpoint, so we don't attempt to
// deal with routing here for now.
rouille::start_server(listen, move |request| {
let query: SourcegraphQuery = try_or_400!(rouille::input::json_input(request));
println!("Handling highlighting request for '{}'", query.filepath);
let mut buf: Vec<u8> = Vec::new();
// We don't use syntect with the sourcegraph themes bundled
// currently, so let's fall back to something that is kind of
// similar (tm).
let theme = &THEMES.themes[match query.theme.as_str() {
"Sourcegraph (light)" => "Solarized (light)",
_ => "Solarized (dark)",
}];
format_code(
theme,
&mut query.code.as_bytes(),
&mut buf,
&query.filepath,
);
Response::json(&json!({
"is_plaintext": false,
"data": String::from_utf8_lossy(&buf)
}))
});
}
fn main() {
// Parse the command-line flags passed to cheddar to determine
// whether it is running in about-filter mode (`--about-filter`)
@ -299,21 +336,31 @@ fn main() {
.long("about-filter")
.takes_value(false),
)
.arg(
Arg::with_name("sourcegraph-server")
.help("Run as a Sourcegraph compatible web-server")
.long("sourcegraph-server")
.takes_value(false),
)
.arg(
Arg::with_name("listen")
.help("Address to listen on")
.long("listen")
.takes_value(true),
)
.arg(Arg::with_name("filename").help("File to render").index(1))
.get_matches();
let mut args = Args::default();
args.about_filter = matches.is_present("about-filter");
let filename = matches.value_of("filename").expect("filename is required");
if let Some(lang) = (*FILENAME_OVERRIDES).get(filename) {
args.lang_override = Some(lang);
if matches.is_present("sourcegraph-server") {
highlighting_server(
matches
.value_of("listen")
.expect("Listening address is required for server mode"),
);
return;
}
args.extension = Path::new(&filename)
.extension()
.and_then(OsStr::to_str)
.map(|s| s.to_string());
let filename = matches.value_of("filename").expect("filename is required");
let stdin = io::stdin();
let mut in_handle = stdin.lock();
@ -321,8 +368,14 @@ fn main() {
let stdout = io::stdout();
let mut out_handle = stdout.lock();
match args.extension.as_ref().map(String::as_str) {
Some("md") if args.about_filter => format_markdown(&mut in_handle, &mut out_handle),
_ => format_code(&mut in_handle, &mut out_handle, &args),
if matches.is_present("about-filter") && filename.ends_with(".md") {
format_markdown(&mut in_handle, &mut out_handle);
} else {
format_code(
&THEMES.themes["InspiredGitHub"],
&mut in_handle,
&mut out_handle,
filename,
);
}
}