Fennel - Programming language

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Fennel is a programming language created in 2016 by Calvin Rose.

#136on PLDB

10Years Old

207Repos

Download source code:

git clone https://github.com/bakpakin/fennel

Homepage · Source Code

Lua Lisp Language

Tags: programming language, lisp
Fennel is developed on GitHub and has 2,369 stars
There are at least 207 Fennel repos on GitHub
Early development of Fennel happened in https://lists.sr.ht/%7Etechnomancy/fennel
Fennel is written in Fennel, Markdown, Lua, YAML, Make, Diff, Bourne shell
The Google BigQuery Public Dataset GitHub snapshot shows 12 users using Fennel in 12 repos on GitHub
Pygments supports syntax highlighting for Fennel
fennel-lang.org was registered in 2018
5 PLDB concepts link to Fennel: cloc, Fennel, funl, mal, Pygments

Example from the web:

;; Sample: read the state of the keyboard and move the player accordingly
(local dirs {:up [0 -1] :down [0 1] :left [-1 0] :right [1 0]})
(each [key delta (pairs dirs)]
  (when (love.keyboard.isDown key)
    (let [[dx dy] delta
          [px py] player
          x (+ px (* dx player.speed dt))
          y (+ py (* dy player.speed dt))]
      (: world :move player x y))))

Example from hello-world:

(print "Hello World")

Language features

Feature	Supported	Example	Token
Integers	✓	; -?\d+
Floats	✓	; -?\d+\.\d+
Strings	✓	"Hello world"	"
Print() Debugging	✓		print
Comments	✓	; A comment
Line Comments	✓	; A comment	;
Semantic Indentation	X