Configure Assetic's LessFilter

assetic-less.yml

# Sample configuration for overriding Assetic's default LessFilter
# configuration in order to define one or more "load paths".
#
# Setting load paths allows to load libraries (such as Twitter's Bootstrap
# less sources) from different directories.
#
# Save this file in your bundle's `config` directory and import it into
# yor `services.yml` using the `imports` directive, eg.:
#
#     imports:
#       - { resource: assetic-less.yml }
#
# Link the stylesheets in your templates with:
#
#     {% stylesheets '@FooBundle/Resources/public/css/*'
#       filter="less" %}
#
#       <link rel="stylesheet" href="{{ asset_url }}" type="text/css" />
#
#     {% endstylesheets %}
#
parameters:
  # Set to true to enable compression of the generated CSS.
  less.compress: false

  # Node executable's location.
  less.node_bin: /usr/local/bin/node

  # Node modules location (eg.: directory where npm installed "less",
  # you'll find a "less" directory in there).
  less.node_module_dir: /usr/local/lib/node_modules

  # Where to look for "@imported" files.
  #
  # The following:
  #
  #     @import "bootstrap.less"
  #
  # Will result in a "bootstrap.less" file being searched in the
  # configured directory (after the default one, which is the
  # directory contaning the asset being parsed).
  less.bootstrap_less_sources: /Users/marzocchi/Desktop/lab/bootstrap/less

services:
  foo.assetic.filter.less:
    class: "Assetic\\Filter\\LessFilter"
    arguments:
      - %less.node_bin%
      - [ %less.node_module_dir% ]
    calls:
      - [ addLoadPath, [ %less.bootstrap_less_sources% ] ]
      - [ setCompress, [ %less.compress% ] ]
    tags:
      # Tag this service as an "assetic.filter", and give it the "less" alias
      # to override the builtin "less" filter.
      - { name: "assetic.filter", alias: "less" }