Rakefile to build, preview and auto-rebuild haml+compass

gistfile1.rb

require 'rake/clean'
include Rake::DSL

task :default => [:watch]

HAML = FileList['**/*.haml']
HTML = HAML.ext('html')
SCSS = FileList['**/scss/*.scss']
CSS = SCSS.gsub('scss', 'css').ext('css')

CLEAN.include HTML + CSS

task :compile => HTML + CSS

desc 'Generate markup and stylesheets and open browser preview'
task :preview, [:filename] => [:compile] do |t, args|
    index = HTML.grep(/index/).first
    args.with_defaults :filename => index

    sh "( which gnome-open > /dev/null && gnome-open \"#{args[:filename]}\" ) || \
        ( which open > /dev/null && open -g \"#{args[:filename]}\" )"
end

desc 'Watch the site and regenerate when it changes'
task :watch, [:filename] => [:preview] do |t, args|
    require 'fssm'
    FSSM.monitor do
        path "#{File.dirname(__FILE__)}" do
            glob '**/*.{haml,scss}'
            update {|base, relative| refresh(args[:filename], relative)}
            delete {|base, relative| refresh(args[:filename], relative)}
            create {|base, relative| refresh(args[:filename], relative)}
        end
    end
end

# Refreshes the browser preview by calling rake preview.
# Passes a file argument to the preview task:
# If rake watch has been called with an explicit file name,
# that one is used. Otherwise the last changed haml file
# is used.
def refresh(filename, changed)
    if filename.nil?
        if changed.match /\.haml$/
            filename = changed.sub(/\.haml/, '.html')
            $lastfilename = filename
        else
            filename = $lastfilename
        end
    end
    sh "rake preview[\"#{filename}\"]"
end

rule '.html' => '.haml' do |t|
    puts "Rebuilding #{t.name}"
    libs = Dir.glob('**/*.rb').map{ |f| "-r \"#{f}\"" }.join(" ")
    sh "haml #{libs} \"#{t.source}\" \"#{t.name}\""
end

rule '.css' => lambda { |cssfile| source(cssfile) } do |t|
    config = FileList['**/config.rb'].first
    if config
        Dir.chdir(File.dirname(config)) do
            sh 'compass compile'
        end
    else
        puts "Rebuilding #{t.name}"
        sh "sass #{t.source} #{t.name}"
    end
end

def source(cssfile)
    SCSS.find { |f| File.basename(f, '.scss') == File.basename(cssfile, '.css') }
end

Hey,

I've tried to make a rakefile off of this code which only watches a folder for changes in the .haml file and compiles it to .html. It does work but probably has code which is not needed (such as the :preview task perhaps?). If you want please take a look at it here: https://gist.github.com/2829808 .

Thanks for the hard work!
/C

Hi. I've tried to (somewhat) simplify and comment the code: https://gist.github.com/2830310 I don't know if you can achieve the same functionality completely without the preview task. Hope this helps... Ole.