Quillstack Output

The library responsible for console output in CLI commands, colouring text with HTML-like tags.

Why this exists

A command-line tool needs two things from its output: colour where a person is watching, and no colour where the output is being piped into a file or read by another program. Getting the second one wrong fills logs with escape codes.

This does both, in one class with three methods, and it is what quillstack/cli writes through. It exists separately from the console because writing coloured text is not the same job as parsing arguments, and plenty of scripts want the first without the second.

Requirements

• PHP 8.1 or newer

Installation

composer require quillstack/output

Usage

use Quillstack\Output\Output;

$output = new Output();

$output->writeln('Everything <green>works</green>');
$output->writeln('Something <red>went wrong</red>');

Or through the helpers, which are there as soon as the package is installed:

writeln('Everything <green>works</green>');
write('No line ending here');

format() returns the text instead of writing it:

$line = $output->format('<yellow>Careful</yellow>');

Colours

A colour is opened with <name> and closed with </name>. A colour left open is closed at the end of the text, so the terminal is never left painted. Tags naming no colour are left exactly as they were, so text which merely looks like markup survives untouched.

Tag	Tag
<black>	<dark-grey>
<red>	<light-red>
<green>	<light-green>
<brown>	<yellow>
<blue>	<light-blue>
<purple>	<light-purple>
<cyan>	<light-cyan>
<light-grey>	<white>

Colours of your own go to the constructor, written as ANSI codes:

use Quillstack\Output\Colors;
use Quillstack\Output\Output;

$output = new Output(new Colors(['brand' => '1;35']));

$output->writeln('<brand>Quillstack</brand>');

Output which is not a terminal

Escape codes only make sense on a terminal. Piped somewhere else they are noise, so an undecorated output drops them and writes the text alone:

$output = new Output(decorated: stream_isatty(STDOUT));

Benchmark

Measured with quillstack/benchmark on a thousand lines of tagged text turned into escape codes. Runs are interleaved and unconcurrent, each figure is the median of five, and PHP is 8.5.7.

	Version
quillstack/output	0.6.0
symfony/console	v7.4.17

	Per line	Relative	Installed
quillstack/output	1.92 µs	—	76 kB
symfony/console	6.19 µs	3.2×	952 kB

league/climate is not in the table: it writes as it formats rather than handing back a string, so there is nothing to measure the same way. It is 704 kB.

Symfony's formatter is doing considerably more. It parses nested tags, supports 256-colour and true-colour output, href links, custom styles registered by name, and it wraps text to the terminal width. This matches a fixed set of tags and replaces them.

At two microseconds a line, a command printing a thousand lines spends two milliseconds here and six on Symfony's — and if you are printing a thousand lines to a terminal, the terminal is the slow part.

Tests

composer test

Coverage needs phpdbg:

composer test:coverage

The rest of Quillstack

This is one component of Quillstack, a PHP framework which is as simple to use as it is strict about what it does.

• quillstack/cli — which writes through this
• quillstack/logger — whose console handler colours by level
• quillstack/benchmark — which prints its results with it

License

MIT. See LICENSE.