Flambe: auto build/serve on .hx change

start

#!/usr/bin/env node

var spawn = require('child_process').spawn
    ,StringDecoder = require('string_decoder').StringDecoder
    ,build,serve
    ;

function logData() {
    var i,len;
    for (i = 0, len = arguments.length; i < len; i++) {
        var decoder = new StringDecoder('utf8');
        console.log(decoder.write(arguments[i]));
    }
}

// When we're called from supervisor (see below), 
// just spawn 'flambe run html --debug'
if ((process.argv.length === 3) && (process.argv[2] === '-supervisor')) {
    spawn('flambe',['run','html','--debug']);
    
    // Try to keep from exiting
    process.stdin.resume();
} else {
    // If we're not being called from supervisor, do an initial build
    console.log('building...');
    build = spawn('flambe', ['build','html','--debug'])
    build.stdout.on('data', logData);
    build.stderr.on('data', logData)
    build.on('close', function (code) {
        if (code !== 0) {
            console.log('build process exited with code ' + code);
            process.exit(code);
        }
        build = null;

        // And when that finishes, launch the server    
        console.log('serving...')
        serve = spawn('flambe', ['serve'])
        serve.stdout.on('data', logData);
        serve.stderr.on('data', logData)
        serve.on('close', function(code) {
            console.log('serve process exited with code ' + code);
            process.exit(code);
            serve = null;
        })

        // Now that we've launched the server, call supervisor
        // with ourselves as the node file to run when things 
        // change
        console.log('watching...')
        supervisor = spawn('supervisor', ['-w','src','-e','hx','--','bin/start','-supervisor'])
        supervisor.stdout.on('data', logData);
        supervisor.stderr.on('data', logData)
    });

    process.on('SIGTERM', function() {
        if (build) {
            console.log('Killing flambe build');
            build.kill();
        }

        if (serve) {
            console.log('Killing flambe serve');
            serve.kill();
        }

        process.exit();
    });    
}