Play framework 2.1.x won't compile Twitter Bootstrap 3 LESS

Question

I am trying to setup a Play framework 2.1.1 with Twitter Bootstrap 3 using the LESS files.

I've put the bootstrap LESS files into app\assets\stylesheets\bootstrap.

I've update my project configuration (Build.scala), in order to compile only the main bootstrap.less file (importing the other files) :

val main = play.Project(appName, appVersion, appDependencies).settings(
    lessEntryPoints <<= baseDirectory(customLessEntryPoints),
    javascriptEntryPoints <<= baseDirectory(customJavascriptEntryPoints)
)

def customLessEntryPoints(base: File): PathFinder = (
    (base / "app" / "assets" / "stylesheets" / "bootstrap" / "bootstrap.less") +++
    (base / "app" / "assets" / "stylesheets" / "*.less")
)

def customJavascriptEntryPoints(base: File): PathFinder = (
  (base / "app" / "assets" / "javascripts" * "*.js")
)

I can't manage to compile Bootstrap, I get the following :

Expected )
In ...\app\assets\stylesheets\bootstrap\mixins.less at line 0.

The problem seems to come from the mixin parameters separed by semicolons. When I replace these semicolons by commas it works.

Does the Play LESS compiler need commas ? Do I need to replace every semicolon by comma or can I configure Play LESS compiler ?

Thanks

EDIT :

There is an official issue here : https://github.com/playframework/playframework/issues/1423

It seems that i need to wait for an upgrade of Play with a new version of LESS compiler. I'll be using an external compiler meanwhile.

Answer 1

Here is a temporary solution posted by the guy mica16 from github:

1) I installed the plugin following the documentation: https://github.com/jmparsons/play-lessc (there's an error in the example shown => the command must be: npm install -g less and not npm install -g lessc).

2) In the plugins.sbt, I added these lines :

resolvers += "JMParsons Releases" at "http://jmparsons.github.io/releases/"

addSbtPlugin("com.jmparsons" % "play-lessc" % "0.0.8")

(make sure you separate them by a line jump)

3) I opened my build.scala and I inserted the lines specified by the plugins and add these:

def customLessEntryPoints(base: File): PathFinder =
(base / "app" / "assets" / "stylesheets" * "bootstrap.less") +++
(base / "app" / "assets" / "stylesheets" * "main.less") (main.less is my custom css)

For a reason I can't define (I don't even seek for it for now), you should place your bootstrap less files directly in the stylesheets root folder. Otherwise, I couldn't make those file compile.

4) I specified the html line concerning the css:

<link rel="stylesheet" media="screen" href="@routes.Assets.at("stylesheets/bootstrap.min.css")">

5) I run play run and the whole worked.

Edit - As someone asked: is there a way to install lessc plugin without installing jsnode and npm?