compiling a minified version of css. This configures your compass project to emit files in minified form when compiling for production.

_minified_filenaming.md

$ compass compile --environment production && compass compile

Afterwards you will have both the minified and non-minified versions in your output folder. Note that compass clean will not clean up your minified files.

config.rb

# add this to your compass configuration file
extend Compass::Actions 
Compass::Logger::ACTION_COLORS[:move] = :green

# Relativizing a path requires us to specify the working path.
def working_path
  Dir.pwd
end

# you can change how a minified filename is constructed by changing this function.
# note that currently, chrome only understands sourcemaps that end in .css.map
def min_name(name)
  dir = File.dirname(name)
  base = File.basename(name)
  base, ext = base.split(".", 2)
  if dir == "."
    "#{base}-min.#{ext}"
  else
    File.join(dir, "#{base}-min.#{ext}")
  end
end

on_stylesheet_saved do |css_file|
  if top_level.environment == :production
    min = min_name(css_file)
    FileUtils.mv css_file, min
    css = File.read(min)
    changed = false
    # if there's a sourcemap, it is also moved.
    css.gsub!(%r{sourceMappingURL=(.*) ?\*/}) do |match|
      changed = true
      "sourceMappingURL=#{min_name($1)} */"
    end
    if changed
      open(min, "w") do |f|
        f.write(css)
      end
    end
    logger.record :move, "#{relativize(css_file)} => #{relativize(min)}"
  end
end

# this is new in compass 1.0.0.alpha.18
on_sourcemap_saved do |sourcemap_file|
  if top_level.environment == :production
    min = min_name(sourcemap_file)
    FileUtils.mv sourcemap_file, min
    logger.record :move, "#{relativize(sourcemap_file)} => #{relativize(min)}"
  end
end

Excellent. I had been trying to build this kind of functionality into my fork https://github.com/boldfacedesign/compass but couldn't get the watch function to work properly. This opens some new options for me.