feat(tools/cheddar): Check in new syntax highlighting tool

The first step with this tool will be to use it as a source-filter for
cgit. The second step is to use it as the Markdown renderer by
depending on one of the Markdown libraries, with integration for
rendering code snippets directly.
This commit is contained in:
Vincent Ambo 2019-12-21 04:20:15 +00:00
parent 87cf3a2c6f
commit 4681c07bde
8 changed files with 772 additions and 2 deletions

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depot depot
===== =====
[![Build Status](https://travis-ci.org/tazjin/depot.svg?branch=master)](https://travis-ci.org/tazjin/depot)
This repository is the [monorepo][] for my personal tools and infrastructure. This repository is the [monorepo][] for my personal tools and infrastructure.
Everything in here is built using [Nix][] with an automatic attribute-set layout Everything in here is built using [Nix][] with an automatic attribute-set layout
that mirrors the filesystem layout of the repository (this might feel familiar that mirrors the filesystem layout of the repository (this might feel familiar

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target/

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8
tools/cheddar/Cargo.toml Normal file
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@ -0,0 +1,8 @@
[package]
name = "cheddar"
version = "0.1.0"
authors = ["Vincent Ambo <mail@tazj.in>"]
edition = "2018"
[dependencies.syntect]
version = "3.3"

10
tools/cheddar/README.md Normal file
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@ -0,0 +1,10 @@
cheddar
=======
Cheddar is a tiny Rust tool that uses [syntect][] to render source code to
syntax-highlighted HTML.
The name was chosen because I was eyeing a pack of cheddar-flavoured crisps
while thinking about name selection.
[syntect]: https://github.com/trishume/syntect

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@ -0,0 +1,3 @@
{ pkgs, ... }:
pkgs.third_party.naersk.buildPackage ./.

84
tools/cheddar/src/main.rs Normal file
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@ -0,0 +1,84 @@
use std::env;
use std::ffi::OsStr;
use std::io::BufRead;
use std::io;
use std::path::Path;
use syntect::easy::HighlightLines;
use syntect::highlighting::ThemeSet;
use syntect::parsing::{SyntaxSet, SyntaxReference};
use syntect::html::{
append_highlighted_html_for_styled_line,
start_highlighted_html_snippet,
IncludeBackground,
};
fn syntax_from_args(syntaxes: &SyntaxSet) -> Option<&SyntaxReference> {
// The name of the file to be formatted is usually passed in as
// the first argument and can be used to determine a syntax set.
let args = env::args().collect::<Vec<String>>();
if args.len() != 2 {
return None
}
Path::new(&args[1])
.extension()
.and_then(OsStr::to_str)
.and_then(|ext| syntaxes.find_syntax_by_extension(ext))
}
fn should_continue(res: &io::Result<usize>) -> bool {
match *res {
Ok(n) => n > 0,
Err(_) => false,
}
}
fn main() {
let syntaxes = SyntaxSet::load_defaults_newlines();
let stdin = io::stdin();
let mut stdin = stdin.lock();
let mut linebuf = String::new();
// Get the first line, we might need it for syntax identification.
let mut read_result = stdin.read_line(&mut linebuf);
// Set up the highlighter
let ts = ThemeSet::load_defaults();
let theme = &ts.themes["InspiredGitHub"];
let syntax = syntax_from_args(&syntaxes)
.or_else(|| syntaxes.find_syntax_by_first_line(&linebuf))
.unwrap_or_else(|| syntaxes.find_syntax_plain_text());
let mut hl = HighlightLines::new(syntax, theme);
let (mut outbuf, bg) = start_highlighted_html_snippet(theme);
// Rather than using the `lines` iterator, read each line manually
// and maintain buffer state.
//
// This is done because the syntax highlighter requires trailing
// newlines to be efficient, and those are stripped in the lines
// iterator.
while should_continue(&read_result) {
let regions = hl.highlight(&linebuf, &syntaxes);
append_highlighted_html_for_styled_line(
&regions[..],
IncludeBackground::IfDifferent(bg),
&mut outbuf,
);
// immediately output the current state to avoid keeping
// things in memory
print!("{}", outbuf);
// merry go round again
linebuf.clear();
outbuf.clear();
read_result = stdin.read_line(&mut linebuf);
}
println!("</pre>");
}