core: add functionality to compress output

sass/main.rkt

@@ -24,8 +24,10 @@
   (parameter/c (listof path-string?))
   (make-parameter null))
 
-(define (prepare-context! context)
+(define (prepare-context! context compressed)
   (define options (sass_context_get_options context))
+  (when compressed
+    (sass_option_set_output_style options 'SASS_STYLE_COMPRESSED))
   (for ([path (reverse (current-include-paths))])
     ;; Unlike sass_make_data_context, this function does not take
     ;; ownership of path.  Cool.
@@ -34,7 +36,7 @@
 (define ((make-compiler #:constructor make-wrapper
                         #:destructor free-wrapper
                         #:context-accessor get-context
-                        #:compilation-fn compile-sass) input)
+                        #:compilation-fn compile-sass) input [compressed #f])
   (define wrapper #f)
   (define context #f)
 
@@ -42,7 +44,7 @@
     (lambda _
       (set! wrapper (make-wrapper input))
       (set! context (get-context wrapper))
-      (prepare-context! context))
+      (prepare-context! context compressed))
     (lambda _
       (define code (compile-sass wrapper))
       (case code
@@ -52,14 +54,14 @@
       (free-wrapper wrapper))))
 
 (define/contract compile/file
-  (-> path-string? string?)
+  (->* (path-string?) (boolean?) string?)
   (make-compiler #:constructor (compose1 sass_make_file_context path->complete-path)
                  #:destructor sass_delete_file_context
                  #:context-accessor sass_file_context_get_context
                  #:compilation-fn sass_compile_file_context))
 
 (define/contract compile/bytes
-  (-> bytes? string?)
+  (->* (bytes?) (boolean?) string?)
   ;; Sass_Data_Context frees the string that gets passed into it after
   ;; compilation so we have to copy the input string and ensure that the
   ;; resulting copy isn't managed by the GC.
@@ -68,9 +70,9 @@
                  #:context-accessor sass_data_context_get_context
                  #:compilation-fn sass_compile_data_context))
 
-(define/contract (compile/string data)
-  (-> non-empty-string? string?)
-  (compile/bytes (string->bytes/utf-8 data)))
+(define/contract (compile/string data [compressed #f])
+  (->* (non-empty-string?) (boolean?) string?)
+  (compile/bytes (string->bytes/utf-8 data) compressed))
 
 
 (module+ test

sass/private/libsass.rkt

@@ -10,6 +10,7 @@
  libsass_language_version
 
  sass_option_push_include_path
+ sass_option_set_output_style
 
  sass_context_get_options
  sass_context_get_output_string
@@ -45,6 +46,12 @@
 (define _Sass_Options-pointer (_cpointer 'Sass_Options))
 (define-sass sass_option_push_include_path (_fun _Sass_Options-pointer _path -> _void))
 
+(define _Sass_Output_Style
+  (_enum '(SASS_STYLE_NESTED = 0
+           SASS_STYLE_EXPANDED
+           SASS_STYLE_COMPACT
+           SASS_STYLE_COMPRESSED)))
+(define-sass sass_option_set_output_style (_fun _Sass_Options-pointer _Sass_Output_Style -> _void))
 
 ;; Sass_Context ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;