A replacement for 'lein new' with templates.
Latest commit 6808f99 Feb 1, 2013 @Raynes Update README.markdown



As of Leiningen 2.0.0, this task is included inside of leiningen's codebase. This plugin will no longer be developed and all issues should be opened on leiningen's issue tracker.


This plugin provides the 'new' task for creating fresh project skeletons from Leiningen 2.x, but is usable from Leiningen 1.x as well.

It is extensible via templates and has a simple API for creating them. With this new task, you can create templates for any sort of project scaffolding you can imagine, as simple or complex as you like.

By default, it includes four templates: default, app, plugin, and template. 'default' is for libraries, the same as what Leiningen's old 'new' task spits out. 'app' is for applications, while 'plugin' generates a skeleton Leiningen plugin project. 'template' is a very meta template for creating new templates.


Writing Templates

Suppose you've written a fabulously popular library, used the world over by adoring fans. For the purposes of this document, let's say this library is called "liquid-cool". If using liquid-cool takes a bit of setup, or if you'd just like to give your users a little guidance on how one might best create a new project which uses liquid-cool, you might want to provide a template for it (just like how lein (via lein-newnew) already provides built-in templates for "app", "plugin", and so on).

Let's assume your library's project dir is ~/dev/liquid-cool. Create a template for it like so:

cd ~/dev
lein new template liquid-cool --to-dir liquid-cool-template

Note that you'll now have a new and separate project named "liquid-cool-template". It will have a group-id of "liquid-cool", and an artifact-id of "lein-template".

All lein templates have an artifact-id of "lein-template", and are differentiated by their group-id, which always should match the project for which they provide a template.

The files that your template will provide to users are in src/leiningen/new/liquid_cool. lein-newnew starts you off with just one, named "foo.clj". You can see it referenced in src/leiningen/new/liquid_cool.clj, right underneath the "->files data" line.

You can delete foo.clj if you like (and it's corresponding line in liquid-cool.clj), and start populating that src/leiningen/new/liquid_cool directory with the files you wish to be part of your template. For everything you add, make sure the liquid-cool.clj file receives corresponding entries in that ->files call. For examples to follow, have a look inside the *.clj files for the built-in templates.

While developing a template, if you're in the template project lein-newnew will pick it up and you'll be able to test it. However, if you want to use it on your system without putting it on clojars, just lein install your template. If you're using Leiningen 1.x, do lein plugin install mytemplate 0.1.0; on Leiningen 2.x it will be available automatically.

Distributing your template

Templates are just maven artifacts. Particularly, they need only be on the classpath when 'lein new' is called. So, as an awesome side-effect, you can just put your templates in a jar and toss them on clojars and have people install them like normal Leiningen plugins.

In Leiningen 2.x, templates get dynamically fetched if they're not found. So for instance lein new heroku myproject will find the latest version of the heroku/lein-template project from Clojars and use that.

Usage in Leiningen 1.x

$ lein plugin install lein-newnew 0.2.6
$ lein new foo
$ lein new plugin lein-foo

This plugin requires Leiningen 1.6.2 or later. Please confirm that you have this version by running lein version before installing the plugin. If you install the plugin on an older version (not sure how old it has to be to cause problems), you'll probably need to uninstall the plugin and then reinstall it after upgrading.

Usage in Leiningen 2.x

You can pull in a newer version of this plugin than the one that comes with Leiningen 2 if you like; just add it to the :plugins section of your :user profile in ~/.lein/profiles.clj:

{:user {:plugins [[lein-newnew "0.3.4"]]}}


Copyright © 2011-2012 Anthony Grimes and contributors

Distributed under the Eclipse Public License, the same as Clojure.