pp-parachute/bundlers/compilers/sass_compiler.js

Airdrop JS Applications

var Promise = require('bluebird');
var sass = require('node-sass');
var fs = require('fs');
var path = require('path');

var createEntryFile = function (filePaths) {
    var entryFile = filePaths[0];
    if(typeof entryFile !== 'string') return null;
    var imports = fs.readFileSync(entryFile).toString();
    for (var i = 0; i < filePaths.length; i++) {
        //todo handle an entry file, otherwise take them in the order they come in
        if (filePaths[i] === entryFile) continue;
        imports += '\n@import "' + filePaths[i] + '";';
    }
    //generate a temporary file that is the entry file + all the import directives.
    //given a random name in case two instances are running and happen to collide.
    var tempEntryFile = path.dirname(entryFile) + '/sass_tmp_' + new Date().getTime() + '_.scss';
    fs.writeFileSync(tempEntryFile, imports);
    return tempEntryFile;
};

var compile = function (filePaths) {
    var entryFile = createEntryFile(filePaths);
    if(!entryFile) return Promise.resolve('');
    return new Promise(function (resolve, reject) {
        sass.render({
            file: entryFile,
            success: function (result) {
                resolve(result.css);
                //destroy temp file if it is there
                fs.existsSync(entryFile) && fs.unlinkSync(entryFile);
            },
            error: function (result) {
                //destroy temp file if it is there
                fs.existsSync(entryFile) && fs.unlinkSync(entryFile);
                reject({
                    path: result.file,
                    error: result.message,
                    line: 'Line: ' + result.line + ', Column: ' + result.column
                });
            }
        });
    });
};

module.exports = {
    compile: compile
};