NAME Lingy - Do for Perl what Clojure did for Java SYNOPSIS Run the Lingy REPL: $ lingy Welcome to Lingy [perl] user=> (p pos? println prn pr-str user=> (prn "Hello, world!") "Hello, world!" nil user=> or a Lingy one-liner: $ lingy -e '(println "Hello, world!")' Hello, world! or run a Lingy program file: $ echo '(println "Hello, world!")' > hello.ly $ lingy hello.ly Hello, world! or run an example Lingy program: $ wget -q https://raw.githubusercontent.com/ingydotnet/lingy/main/eg/99-bottles.ly $ cat 99-bottles.ly (defn main [number] (let [ paragraphs (map paragraph (range number 0 -1)) ] (map println paragraphs))) (defn paragraph [num] (str (bottles num) " of beer on the wall,\n" (bottles num) " of beer.\n" "Take one down, pass it around.\n" (bottles (dec num)) " of beer on the wall.\n")) (defn bottles [n] (cond (= n 0) "No more bottles" (= n 1) "1 bottle" :else (str n " bottles"))) (main (nth *ARGV* 0 99)) $ lingy 99-bottles.ly 3 3 bottles of beer on the wall, 3 bottles of beer. Take one down, pass it around. 2 bottles of beer on the wall. 2 bottles of beer on the wall, 2 bottles of beer. Take one down, pass it around. 1 bottle of beer on the wall. 1 bottle of beer on the wall, 1 bottle of beer. Take one down, pass it around. No more bottles of beer on the wall. STATUS Lingy is in ALPHA status. It has: * The eg directory of example programs that work * A pretty good REPL * Tab completion * Command history * History search * Parentheses visual matching * Other nice readline features To Do: * AOT and JIT compile to native Perl, LuaJIT or LLVM * Compile to native Perl code DESCRIPTION Lingy is an implementation of the Clojure language that is written in Perl and hosted by Perl and LLVM. Programs and modules written in Lingy have full access to Perl and its CPAN modules. Perl modules can be written in Lingy and distributed on CPAN. Since Lingy code is compiled to LLVM, it should perform on the same order of magnitude as XS modules. Since Lingy is a complete Clojure implementation, it should be able to run programs written in Clojure and make use of libraries written in Clojure. Clojure is a language that cleanly solves many of the problems of Java including making concurrency simple, and writing functional programs with mostly immutable data types. It is a Lisp dialect that is hosted by Java and compiles to JVM byte code. It has access to any libraries that target the JVM. Much of the Clojure language is written in Clojure (self hosted) and Lingy actually uses the Clojure source code. A variant of Clojure called ClojureScript uses the same Clojure source code but is hosted by JavaScript with full access to NPM modules. Lingy also intends to eventually be ported to and hosted by many other programming languages. Lingy started as a Perl implementation of the Make a Lisp project. This provided a bare-bones Clojure-inspired Lisp interpreter from which Lingy has grown upon. INSTALLATION cpanm Lingy LINGY CLI USAGE The Lingy language installs a command lingy. You can use this command to run Lingy programs, start a Lingy REPL or run Lingy one-liner expressions. * lingy --repl (or just lingy) Starts a Lingy interactive REPL. The REPL has readline support that includes: * Command history * CTL-R searching * Parentheses match highlighting * CTL-C to abort a command w/o leaving REPL Use CTL-D to exit the REPL * lingy program.ly foo bar Run a Lingy program passing in arguments. Arguments are available in Lingy as *ARGV*. * cat program.ly | lingy - foo bar Run a Lingy program from STDIN and pass in arguments. The - means run from STDIN instead of a file. If there are no arguments you can omit the -. * lingy -e '(println "Hello" (nth *ARGV* 0))' world Run a Lingy one-liner with arguments. When used with --repl, run the -e code first, then enter the REPL. LINGY CLI OPTIONS * -e , --eval= A Lingy string to evaluate. * -r, --repl Start a Lingy REPL. Can be used with -e. * --ppp Print the Lingy compiled AST for a -e expression. * --xxx YAML dump the Lingy compiled AST for a -e expression. ROADMAP The next major things to add are: * Compilation to Perl code * Compilation to LLVM bytecode * Lambdas SEE ALSO * Clojure * YAMLScript * Test::More::YAMLScript AUTHORS * Ingy döt Net ingy@ingy.net COPYRIGHT AND LICENSE Copyright 2023 by Ingy döt Net This is free software, licensed under: The MIT (X11) License