Compiles all coffeescript files into JS while preserving single line comments then it beautifies the compiled javascript before saving it alongside the coffeescript files.

coffee2js_beautify.js

"use strict";

var fs = require('fs'),
    cs = require('coffee-script'),
    os = require('os'),
    glob = require('glob'),
    beautify = require('js-beautify').js_beautify,
    mkdirp = require('node-mkdirp');

var path = require('path');
var lineReader = require('line-reader');

/*
process.stdin.resume();
carrier.carry(process.stdin, function(line) {
    console.log('got one line: ' + line);
});
*/

function help(){
    console.log('Usage: xxx [ -d outdir ] file1.coffee [file2.coffee]');
    console.log('Compile an entire directory recursively like:');
    console.log('node coffee2js.js /path/to/scripts/**/*.coffee');
}

function compilefile(p, outdir, replacePrepend){
    var outfile=path.dirname(p)+path.sep+path.basename(p,path.extname(p))+ '.js';

    if (outdir){
        if (replacePrepend) {
            outfile = outfile.replace(replacePrepend, outdir);
        } else {
            outfile = outdir + path.sep + path.basename(outfile);
        }
        console.log('outfile='+ outfile);
        console.log('-----');
    }

    var inblockcmts=false;

    var src='';

    var linenum=0;

    lineReader.eachLine(p, function(line, last) {
        var commentStartLine,
            spaces,
            commentStart = '###',
            commentEnd = ' ' + commentStart;
            
        linenum ++;

        var before = line,
            after = null;

        //block comment always start from 0?
        if (/^\s*#/.test(line)) {
            // marke sure it doesn't end in 3 hashes already & it's not a comment start
            if (!/###$/.test(line) &&
                !/###*/.test(line)
            ) {
                commentStartLine = line.indexOf('#');
                spaces = (new Array(commentStartLine + 1)).join(' ');
                line = spaces + commentStart + line.replace(/^\s*#*/, '') + commentEnd;

                after = line
            }
        }
        src += line;
        src += os.EOL;

        if(last) {
            // or check if it's the last one
            //for debugging purpose
            //fs.writeFile(p+'.tmp.coffee', src);

            var dst='';
            try {
                dst=cs.compile(src, {bare: true});
            } catch (e){
                console.log('/*****');
                console.log(' error file: ' + p);
                console.log('*****/');
                console.log(e);
                console.log('/*****');
                console.log(' end-error ');
                console.log('*****/');
            }

            var lines = dst.split(/\r\n|\r|\n/g);

            var dst2='';
            for (var i = 0; i < lines.length; i++){
                line=lines[i];
                //console.log('line='+line);
                var x=line.indexOf('/*');
                var y=line.indexOf('*/');
                //console.log('x='+x+',y='+y);
                if (x>=0 && y>0){
                    line = line.replace('/*', '//');
                    line =line.replace('*/', '');
                    dst2 += line;
                    dst2 += os.EOL;
                    line = line.trim();
                    if (line.length==0){
                        line = lines[++i];
                        line = line.trim();
                        if (line.length==0){
                            continue;
                        }
                    }
                    continue;
                }
                dst2 += line;
                dst2 += os.EOL;
            }

            dst2 = beautify(dst2, {
                indent_size: 4,
                wrap_line_length: 85,
                end_with_newline: true,
                break_chained_methods: true
            });


            fs.writeFile(outfile, dst2);
        }
    });
}

function main(){
    // print process.argv
    if (process.argv.length <=2){
        help();
        return;
    }

    var i=2,
        outdir,
        replacePrepend;

    // var outdir = '/Users/mac/git/coffee2js-comment';
    if (process.argv[i]=== '-d'){
        outdir=process.argv[++i];
        console.log('outdir='+ outdir);
        ++i;
    }

    process.argv.slice(i).forEach(function (val, index, array) {
        console.log('Compiling file '+ index + ': ' + val);
        compilefile(val,outdir, replacePrepend);
    });
}

main();