Add support for sourcemaps (--debug-info in ruby). Fixess #33

[dorny]

Honestly, i didn't study sourcemap specifications.
I opened generated css with --debug-info from ruby and it look's like it's almost same as -l option. Only format is different.

@media -sass-debug-info{filename{font-family:<absolute_filepath>}line{font-family:\00003<line>}}

/* line <line>, <filename>*/

And... It works fine :)

[akhleung]

Thanks! I'll look it over merge it in this weekend.

[dahlia]

Great job! 👍

[dahlia]

It would be better if any parameter for it is exposed via C interface (sass_interface.h).

[dorny]

I'm not sure what exactly do you mean by "exposed viac C interface".
I have already done it by:

#define SASS_SOURCE_COMMENTS_NONE 0
#define SASS_SOURCE_COMMENTS_DEFAULT 1
#define SASS_SOURCE_COMMENTS_MAP 2

In similar way there are defined SASS_STYLE_NESTED,SASS_STYLE_EXPANDED,... as parameters for output style.

[dahlia]

@dorny Oh I exactly meant such thing, cool.

[vaanwd]

Failed to compile on Windows with MinGW.

g++ -Wall -O2 -fPIC -c -o node.o node.cpp
node.cpp:1: warning: -fPIC ignored for target (all code is position independent)
node.cpp: In member function 'std::string Sass::Node::debug_info_path() const':
node.cpp:90: error: 'realpath' was not declared in this scope
make[1]: *** [node.o] Error 1

[lmartins]

Sourcemaps is not the same as debug-info as explained here:
#122 (comment)

[lmartins]

While we don't have source-maps, wouldn't be possible to add the original file/line numbers baked in the output, like the original debug-info in Sass?