Adding support for passing a precision option to libsass

README.md

@@ -75,6 +75,9 @@ The API for using node-sass has changed, so that now there is only one variable
 `outputStyle` is a `String` to determine how the final CSS should be rendered. Its value should be one of `'nested'` or `'compressed'`.
 [`'expanded'` and `'compact'` are not currently supported by [libsass]]
 
+#### precision
+`precision` is a `Number` that will be used to determine how many digits after the decimal will be allowed. For instance, if you had a decimal number of `1.23456789` and a precision of `5`, the result will be `1.23457` in the final CSS.
+
 #### sourceComments
 `sourceComments` is a `String` to determine what debug information is included in the output file. Its value should be one of `'none', 'normal', 'map'`. The default is `'none'`.
 The `map` option will create the source map file in your CSS destination.

binding.cpp

@@ -54,13 +54,15 @@ void ExtractOptions(Local<Value> optionsValue, void* cptr, sass_context_wrapper*
     if (source_comments == SASS_SOURCE_COMMENTS_MAP) {
       ctx->source_map_file = CreateString(options->Get(NanSymbol("sourceMap")));
     }
+    ctx->options.precision = options->Get(NanSymbol("precision"))->Int32Value();
   } else {
     sass_context* ctx = (sass_context*) cptr;
     ctx->source_string = CreateString(options->Get(NanSymbol("data")));
     ctx->options.image_path = CreateString(options->Get(NanSymbol("imagePath")));
     ctx->options.output_style = options->Get(NanSymbol("style"))->Int32Value();
     ctx->options.source_comments = source_comments = options->Get(NanSymbol("comments"))->Int32Value();
     ctx->options.include_paths = CreateString(options->Get(NanSymbol("paths")));
+    ctx->options.precision = options->Get(NanSymbol("precision"))->Int32Value();
   }
 }
 

lib/cli.js

@@ -25,6 +25,10 @@ var optimist = require('optimist')
     describe: 'Path to prepend when using the image-url(…) helper',
     'default': ''
   })
+  .options('precision', {
+    describe: 'The amount of precision allowed in decimal numbers',
+    'default': 5
+  })
   .options('watch', {
     describe: 'Watch a directory or file',
     alias: 'w'
@@ -131,6 +135,8 @@ exports = module.exports = function(args) {
     }
   }
 
+  options.precision = argv.precision;
+
   if (argv.w) {
 
     var watchDir = argv.w;

lib/render.js

@@ -11,6 +11,7 @@ function render(options, emitter) {
     outputStyle: options.outputStyle,
     sourceComments: options.sourceComments,
     sourceMap: options.sourceMap,
+    precision: options.precision,
     success: function(css, sourceMap) {
 
       var todo = 1;

sass.js

@@ -64,6 +64,7 @@ var prepareOptions = function (options) {
     comments: SASS_SOURCE_COMMENTS[sourceComments] || 0,
     stats: stats,
     sourceMap: options.sourceMap,
+    precision: parseInt(options.precision) || 5,
     success: function onSuccess(css, sourceMap) {
       finishStats(stats, sourceMap);
       success && success(css, sourceMap);

test/test.js

@@ -261,3 +261,18 @@ describe('render to file', function() {
   });
 
 });
+
+describe('precision support', function() {
+  it('should render when precision is specified', function(done) {
+    sass.render({
+      data: '.test { margin: 1.23456789 px; }',
+      precision: 10,
+      success: function(css) {
+        done(assert.equal(css, '.test {\n  margin: 1.23456789 px; }\n')); 
+      },
+      error: function(error) {
+        done(error);
+      }
+    });
+  });
+});