clp

clp writes input files to stdout with syntax highlighting. It aims to be relatively fast, provide wide language support, and be easy to extend with new languages. It currently supports 150 languages.

Language support is implemented with LPEG, a tool developed by PUC which uses parsing expression grammars to improve upon traditional regex parsers (described in depth in this article).

More information is available here, along with a blog post showing how I use it with fzf.

Installation

Homebrew

brew tap jpe90/clp
brew install clp

Building from source

Requirements:

a POSIX compliant operating system
a C99 Compiler
Lua >= 5.1 or LuaJIT (the latter for better performance)
LPEG

$ ./configure
$ make
# make install

Distro Specific Dependencies

Ubuntu

# apt-get install -y build-essential pkg-config libluajit-5.1-dev lua-lpeg

Arch

# pacman -S --needed --noconfirm base-devel pkg-config luajit lua51-lpeg

Usage

$ clp [options] filename

-t, --override-filetype {filetype}

Force a language's syntax for highlighting the file. To see available filetypes, run clp --list-overrides

-h, --highlight-line {number}

Highlight a non-blank line

Motivation

Existing syntax highlighting programs are either relatively slow or support a small number of languages. clp aims to be faster without compromising on language support.

Here are some quick benchmarks comparing similar programs running on my machine (clp installed with LuaJIT, highlighting sqlite3.c)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`clp sqlite3.c`	216.6 ± 2.4	212.2	220.8	1.00
`bat --color=always sqlite3.c`	3161.0 ± 12.3	3149.7	3182.7	14.59 ± 0.17
`source-highlight sqlite3.c`	4313.6 ± 25.5	4277.7	4355.9	19.91 ± 0.25

More benchmarks are available here

Parsers are upstreamed from the Scintillua project. It's actively maintained, has great support even for niche languages, and easy to use relative to other syntax definition mechanisms.

Configuration

clp can be configured in ~/.config/clp/clprc.lua:

clprc = {}
clprc.theme = "ansi-16"
return clprc

Changing your colorscheme

Instructions available here.

Contributing

Contributions are welcome! Feel free to send a pull request on Github or a patch on Sourcehut.

gdubicki/clp

clp