Class: Nanoc3::Filters::Less

Inherits:
Nanoc3::Filter show all
Defined in:
lib/nanoc3/filters/less.rb

Constant Summary

Constants inherited from Nanoc3::Filter

Nanoc3::Filter::TMP_BINARY_ITEMS_DIR

Instance Attribute Summary

Attributes inherited from Nanoc3::Filter

#assigns

Instance Method Summary collapse

Methods inherited from Nanoc3::Filter

#depend_on, #filename, from_binary?, #initialize, #output_filename, to_binary?, type

Methods included from PluginRegistry::PluginMethods

#identifier, #identifiers, #named, #register

Methods inherited from Context

#get_binding, #initialize

Constructor Details

This class inherits a constructor from Nanoc3::Filter

Instance Method Details

#run(content, params = {}) ⇒ String

Runs the content through [LESS](lesscss.org/). This method takes no options.

Parameters:

  • content (String) —

    The content to filter

Returns:

  • (String) —

    The filtered content



14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
 
# File 'lib/nanoc3/filters/less.rb', line 14

def run(content, params={})
  # Find imports (hacky)
  imports = []
  imports.concat(content.scan(/^@import\s+(["'])([^\1]+?)\1;/))
  imports.concat(content.scan(/^@import\s+url\((["']?)([^)]+?)\1\);/))
  imported_filenames = imports.map do |i|
    i[1].match(/\.(less|css)$/) ? i[1] : i[1] + '.less'
  end

  # Convert to items
  imported_items = imported_filenames.map do |filename|
    # Find directory for this item
    current_dir_pathname = Pathname.new(@item[:content_filename]).dirname.realpath

    # Find absolute pathname for imported item
    imported_pathname    = Pathname.new(filename)
    if imported_pathname.relative?
      imported_pathname = current_dir_pathname + imported_pathname
    end
    next if !imported_pathname.exist?
    imported_filename = imported_pathname.realpath

    # Find matching item
    @items.find do |i|
      next if i[:content_filename].nil?
      Pathname.new(i[:content_filename]).realpath == imported_filename
    end
  end.compact

  # Create dependencies
  depend_on(imported_items)

  # Add filename to load path
  paths = [ File.dirname(@item[:content_filename]) ]
  parser = ::Less::Parser.new(:paths => paths)
  parser.parse(content).to_css
end