Aleš Najmann littleli

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Meld

A minimal example of creating a (mostly) working FUSE filesystem using Clojure. NOTE: I have only tested this with OSX, and it assumes you have already installed libfuse.

Trying it out

Create an empty directory at /tmp/meld to serve as your mount point, put these files in a directory called meld, then:

Introductory resources

High level overview https://yogthos.github.io/ClojureDistilled.html
Interactive exercises http://clojurescriptkoans.com/
More interactive exercises https://www.4clojure.com/
Community-powered Clojure courses https://clojurecademy.com/
Getting started guide https://grison.me/2020/04/04/starting-with-clojure/
Interactive book https://www.maria.cloud/
Interactive workbook http://viewer.gorilla-repl.org/view.html?source=github&user=lspector&repo=clojinc&path=worksheet.clj
Clojure by example https://github.com/inclojure-org/clojure-by-example

Spike

I looked into the state of GraalVM and Clojure and wrote some small work-related scripts.

GraalVM Build Tools

Downloaded GraalVM and set $GRAALVM_HOME
Found two main libraries for building GraalVM CLIs - https://github.com/luchiniatwork/cambada#packaging-as-a-native-image and https://github.com/taylorwood/clj.native-image (or https://github.com/taylorwood/lein-native-image for the lein equivalent). I chose clj.native-image as it seemed more focused on doing one thing well.
First tried its template example which was easy to follow.
Then added a graalvm build to one of our small cli tools
Found it to be pretty straightforward except for a stdout flushing issue that was trivial to fix

The Pledge

One thing that always made me a little sad about transducers was how map lost its ability to iterate multiple collections in parallel. This is actually my favorite feature of map. For example:

(map + (range 5) (range 5 10))
=> (5 7 9 11 13)

One somewhat practical use of this is if you want to compare two sequences, pairwise, using a comparator. Though I wish that every? took multiple collections, this is an adequate substitute:

Introductory Material

Add Graal JIT Compilation to Your JVM Language in 5 Steps, A Tutorial http://stefan-marr.de/2015/11/add-graal-jit-compilation-to-your-jvm-language-in-5-easy-steps-step-1/
The SimpleLanguage, an example of using Truffle with great JavaDocs https://github.com/graalvm/simplelanguage
Truffle Tutorial, Christan Wimmer, PLDI 2016, 3h recording https://youtu.be/FJY96_6Y3a4 Slides

	(ns prefix-tree)

	;Record representing a node in the prefix tree.
	;strings: The set of strings that the present node represents
	;edges: Map representing edges emanating from this node.
	;The key being the first letter of the label and the value being the label and the actual node being pointed to."
	(defrecord Node [strings edges])

	(defn shorter-string [a b]
	"Return the shorter string of the two being passed in."

	(ns webdav
	(:require [clojure.string :as str]
	[clojure.data.xml :as xml]
	[org.httpkit.server :as hk-server]))

	;; add the XML namespace that we'll use later
	(xml/alias-uri 'd "DAV:")

	(defn dissoc-in
	"Should be in the standard library..."

	(ns radix
	(:require [clojure.string :as string]))
	(use 'clojure.java.io)
	(use 'clojure.pprint)

	(println "Loading names... ")
	(time (def names
	(with-open
	[rdr (reader
	"/usr/share/dict/ProperNames")]

	package sandbox;

	import java.util.Arrays;
	import java.util.Random;

	public class SoABenchmark {

	public static Random rand = new Random(9001);
	public static int NUM_LABELS = 10;
	public static Struct[] aos;