Issue with relative_path - different prefix

[ArmorDarks]

Hi

I'm getting following error when trying to run Sass compiling command with --sourcemap:

C:/Ruby200-x64/lib/ruby/2.0.0/pathname.rb:500:in `relative_path_from': different prefix: "C:/" and "C:\\Users/Username/Desktop/sass" (ArgumentError)
    from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sass-3.3.0.alpha.198/lib/sass/source/map.rb:125:in `block in to_json'
    from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sass-3.3.0.alpha.198/lib/sass/source/map.rb:120:in `each'
    from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sass-3.3.0.alpha.198/lib/sass/source/map.rb:120:in `to_json'
    from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sass-3.3.0.alpha.198/lib/sass/plugin/compiler.rb:318:in `update_stylesheet'
    from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sass-3.3.0.alpha.198/lib/sass/plugin/compiler.rb:182:in `block in update_stylesheets'
    from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sass-3.3.0.alpha.198/lib/sass/plugin/compiler.rb:179:in `each'
    from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sass-3.3.0.alpha.198/lib/sass/plugin/compiler.rb:179:in `update_stylesheets'
    from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sass-3.3.0.alpha.198/lib/sass/plugin.rb:81:in `update_stylesheets'
    from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sass-3.3.0.alpha.198/lib/sass/exec.rb:462:in `watch_or_update'
    from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sass-3.3.0.alpha.198/lib/sass/exec.rb:324:in `process_result'
    from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sass-3.3.0.alpha.198/lib/sass/exec.rb:41:in `parse'
    from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sass-3.3.0.alpha.198/lib/sass/exec.rb:21:in `parse!'
    from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sass-3.3.0.alpha.198/bin/sass:9:in `<top (required)>'
    from C:/Ruby200-x64/bin/sass:23:in `load'
    from C:/Ruby200-x64/bin/sass:23:in `<main>'
[Finished in 0.2s with exit code 1]

Unfortunately, I can't understand - is it bug in my PC enviroment, or ruby\sass issue?

I've tried that solutions
http://stackoverflow.com/a/2916503

but, as expected, it didn't worked.

example of command which outputs error:

sass --watch --sourcemap C:\sass\app.scss:C:\sass\test.css --trace --stop-on-error --no-cache

I'd be thankful for any help

[luislavena]

Hello,

I don't believe this falls into the responsability of RubyInstaller, as this is caused by your usage of paths and how Pathname class interprets them.

As Issue #39 mentions, this issue tracker is to report issues with RubyInstaller and the provided components, but not 3rd party scripts (sass) or language issues like Pathname behavior.

The issue here, as I mentioned, are the paths given to Pathname class to interpret. It is important to note that C:\sass\app.scss is not the same as C:/sass/app.scss and Pathname is having problems with these non-normalized paths.

To reproduce this issue, you can try creating a t.rb script and paste in it:

require "pathname"
require "pp"

a = Pathname.new 'C:\sass\app.scss'
b = Pathname.new 'C:/sass/app.scss'

pp a
pp b

pp a.relative_path_from(b)

What you obtain from running it will be this:

C:\Users\Luis\Desktop>ruby t.rb
#<Pathname:C:\sass\app.scss>
#<Pathname:C:/sass/app.scss>
C:/Ruby200/lib/ruby/2.0.0/pathname.rb:500:in `relative_path_from': different prefix: "C:\\" and "C:/sass/app.scss" (ArgumentError)
        from t.rb:10:in `<main>'

The same error you're reporting.

Now, if I changed the first path (C:\sass\app.scss) to use different slashes instead: C:/sass/app.scss, then the script will work.

Since you're giving to sass a Windows-style path, I suggest you give it instead a path that is compatible with Pathname:

sass --watch --sourcemap C:/sass/app.scss:C:/sass/test.css --trace --stop-on-error --no-cache

That should work.

I recommend you report this to Sass developers, so the paths given from the command line are normalized prior be given to Ruby's Pathname class.

Hope that helps.