chemaclass/phel-cli-gui

Phel functions to render in the terminal. It uses the Cursor from the Symfony Command module.

0.9.0 2026-04-21 10:11 UTC

Requires

• php: >=8.3
• ext-pcntl: *
• ext-posix: *
• ext-readline: *
• phel-lang/phel-lang: ^0.34
• symfony/console: ^7.4

Requires (Dev)

• phpunit/phpunit: ^10.5
• roave/security-advisories: dev-latest
• symfony/var-dumper: ^7.4

MIT

• Jose M Valera Reales

• language
• functional
• lisp
• phel

README

Build rich terminal interfaces in Phel — render text at arbitrary coordinates, draw framed boxes, paint regions, read raw keypresses, and style output with named formatters.

Powered by Symfony's Console Cursor, exposed behind a small, data-first Phel API.

• Works with any TTY (ANSI-capable).
• Zero globals — one managed TerminalGui singleton per process.
• Pure helpers (parse-key) are easy to test without a real terminal.

Requirements

• PHP 8.3+
• ext-pcntl, ext-posix, ext-readline
• Phel ^0.34

Install

composer require chemaclass/phel-cli-gui

Require the namespace in your Phel file:

(ns my-app\main
  (:require phel-cli-gui\terminal-gui :refer [render read-key draw-box clear-screen]))

Quick start

Draw a bordered box, render text inside it, wait for a key, quit.

(ns my-app\hello
  (:require phel-cli-gui\terminal-gui
            :refer [clear-screen draw-box render read-key cleanup-gui]))

(defn main []
  (clear-screen)
  (draw-box {:x 2 :y 1 :width 30 :height 5 :fill-char \space})
  (render 4 3 "Press any key to exit")
  (loop []
    (if (read-key)
      (cleanup-gui)
      (do (php/usleep 10000) (recur)))))

(main)

Run:

vendor/bin/phel run src/phel/hello.phel

Docs

• API reference — every public function, grouped by concern.
• Recipes — copy-paste patterns for common UIs.

Example projects

• phel-snake — classic Snake built with this library.

Development

composer install
composer test          # Phel tests + PHPUnit
composer test:phel     # Phel tests only
composer test:php      # PHPUnit only
composer format        # phel format

Coverage:

XDEBUG_MODE=coverage vendor/bin/phpunit tests \
  --coverage-text --coverage-filter=src/php

Layout:

src/
  phel/terminal-gui.phel    Public Phel API
  php/
    TerminalGui.php         Symfony Console wrapper + singleton
    TerminalCanvas.php      Box / line geometry (pure)
    BorderStyle.php         Border-character value object (pure)
    Text.php                First-char / display-width helpers (pure)
tests/
  phel/                     Phel pure-logic tests
  php/                      PHPUnit tests exercising the rendering layer

License

MIT © Jose M Valera Reales