SCSS and Compass CLI configuration - compass-sass

Question

How do I configure Compass when using the sass CLI?
Basically I was to set the images_dir property, here is the command I have been using:
sass
--compass
path/to/input.scss
path/to/output.css
I tried:
sass
--compass
-c path/to/config.rb
path/to/input.scss
path/to/output.css
Output:
WARNING on line 1 of path/to/config.rb:
This selector doesn't have any properties and will not be rendered.
Syntax error: Invalid CSS after "image_dir ": expected selector, was "= "test""
on line 1 of path/to/config.rb
So obviously the -c doesn't work the same way when using the compass compile command.
And
sass
--compass
--images-dir path/to/images
path/to/input.scss
path/to/output.css
Output:
OptionParser::InvalidOption: invalid option: --images-dir
Likewise as above.
I tried to use the compass compile but I don't have a project directory.
compass compile
--images-dir path/to/images
path/to
path/to/input.scss
Output:
You must compile individual stylesheets from the project directory.
Also tried this:
compass compile
path/to
Output:
Nothing to compile. If you're trying to start a new project, you have left off the directory argument.
config.rb just contained:
images_dir = "test"

Answer 1

compass compile reads a config.rb file for the configuration.
Here is an example project setup that that I use, starting with the config.rb file:
require "susy"
# Set this to the root of your project when deployed:
http_path = "/"
css_dir = "public/css"
sass_dir = "private/scss"
images_dir = "public/images"
http_images_path = "/images"
output_style = :expanded # or :nested or :compact or :compressed
# To disable debugging comments that display the original location of your selectors. Uncomment:
line_comments = true
My project is setup like:
private/scss # scss files. I use a main file that handles imports itself
public/images # images
public/css # built css here
config.rb # contents included above
To build it, I run the following in the project's root folder:
bundle exec compass compile private/scss/layout.scss