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The Mirah Programming Language
Mirah Ruby Other
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bin Prevent calling System.exit in
distbin remove win JAVA_HOME lookup because it has problems with spaces in th…
examples update examples w/ better formatting
javalib operators support for primitive wrappers
lib Make configurable which mirahc.jar to choose.
maven Bump version.
nbproject fix unboxing issues (cherry picked from commit d348ada)
src/org/mirah Merge branch 'fix_bug_388' of into f…
test Merge branch 'fix_bug_388' of into f…
tools merge master into new ast. It's crazy awesome.
.gitignore macro resgistration using java services SPI (cherry picked from commit
.travis.yml allow jruby-head build to fail
COPYING add asm license to a file that's included in the compiler jar
Gemfile Use 'test-unit' gem version 3.0.
History.txt 0.1.4 bump version; update history
LICENSE Fix LICENSE using text version with wrapping lines.
NOTICE update NOTICE whitespace in README
Rakefile added a test for blocks over abstract class accepting itself as a clo… add notes to TODO
mirah.gemspec use an array to get mirahc in the gem closes #278
pom.xml Use more modern JRuby version.


Build Status


Mirah is a customizable programming language featuring static types, local type inference and a heavily Ruby-inspired syntax. Mirah currently includes a typer/compiler backend for the JVM which can output JVM bytecode.


  • Ruby-like syntax
  • Compiles to .class
  • Fast as Java
  • No runtime library


mirah <script.mirah>
mirah -e "inline script"
mirahc <script.mirah>
mirahc -e "inline script" # produces DashE.class


  • Java 1.7 or higher.



If your gem and rake are not from from JRuby, prefix the commands with jruby -S

$ gem install mirah


Mirah is distributed as a jar through maven central. You can download the latest jar from


You can also install Mirah from a zip file. Download the latest stable release from Extract it, and add bin to your $PATH to be able to use mirah, mirahc, etc.


Setup building locally and installing from source, you'll need jruby 1.7.12 or higher. Then just follow these commands.

To get the repository setup locally run the following:

$ git clone
$ cd mirah
$ bundle install

To install mirah as a gem from source:

$ rake gem
$ gem install pkg/mirah-*.gem

To create the mirahc jar:

$ rake dist/mirahc.jar

This will create a mirahc.jar file in dist that you can run to compile mirah source files.

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