From 4681c07bde702f64d630f25ef831267cd9ac09ee Mon Sep 17 00:00:00 2001 From: Vincent Ambo Date: Sat, 21 Dec 2019 04:20:15 +0000 Subject: [PATCH] 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. --- README.md | 2 - tools/cheddar/.gitignore | 1 + tools/cheddar/.skip-subtree | 0 tools/cheddar/Cargo.lock | 666 ++++++++++++++++++++++++++++++++++++ tools/cheddar/Cargo.toml | 8 + tools/cheddar/README.md | 10 + tools/cheddar/default.nix | 3 + tools/cheddar/src/main.rs | 84 +++++ 8 files changed, 772 insertions(+), 2 deletions(-) create mode 100644 tools/cheddar/.gitignore create mode 100644 tools/cheddar/.skip-subtree create mode 100644 tools/cheddar/Cargo.lock create mode 100644 tools/cheddar/Cargo.toml create mode 100644 tools/cheddar/README.md create mode 100644 tools/cheddar/default.nix create mode 100644 tools/cheddar/src/main.rs diff --git a/README.md b/README.md index 726ad8f4a..22ffdda4d 100644 --- a/README.md +++ b/README.md @@ -1,8 +1,6 @@ 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. 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"0.1.0" +authors = ["Vincent Ambo "] +edition = "2018" + +[dependencies.syntect] +version = "3.3" diff --git a/tools/cheddar/README.md b/tools/cheddar/README.md new file mode 100644 index 000000000..96faa34a4 --- /dev/null +++ b/tools/cheddar/README.md @@ -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 diff --git a/tools/cheddar/default.nix b/tools/cheddar/default.nix new file mode 100644 index 000000000..190a05c80 --- /dev/null +++ b/tools/cheddar/default.nix @@ -0,0 +1,3 @@ +{ pkgs, ... }: + +pkgs.third_party.naersk.buildPackage ./. diff --git a/tools/cheddar/src/main.rs b/tools/cheddar/src/main.rs new file mode 100644 index 000000000..1d58bb2ad --- /dev/null +++ b/tools/cheddar/src/main.rs @@ -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::>(); + 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) -> 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( + ®ions[..], + 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!(""); +}