State machines are back, the async way!
$ npm install fsmjsvarfsmjs=require('../lib/fsmjs');vartim=fsmjs({idle: {// when 'go' or 'start' or 'g' are pushed, we move to 'running' and start// an interval that emits a 'tick' event every 100ms.'(go|start|g)': function(cb){process.stdout.write('starting engines...\n');tim.state='running';tim._timer=tim.interval('tick',100);cb();},// strings are target states (and emitted events)exit: 'end',e: 'error',// any other event in this state shows this error'.*': function(cb,e){console.log('error: i cant understand what you mean by "'+e+'"');cb();},},running: {// animate clock every ticktick: function(cb){varclock=['|','/','-','\\'];process.stdout.write('('+clock[tim._i]+")");for(vari=0;i<50;++i)process.stdout.write(' ');process.stdout.write('\r');tim._i=(tim._i+1)%clock.length;cb();},// cannot exit from this stateexit: 'error',// when 'no' or 'stop' or 'x' are pushed, move to 'stopping' and start// a 2sec timeout that emits 'elapsed' when elapsed (surpise!)'(no|stop|x)': function(cb){process.stdout.write('stopping...\n');tim.state='stopping';tim.timeout('stopped',5000);cb();},$exit: function(cb){// take some time before changing state.console.log('our running times are over.. give me 2 more seconds.');setTimeout(cb,2000);},},stopping: {// called when the stopping timer elapses. clears the // interval and changes state to 'idle'stopped: function(cb){process.stdout.write('\nall done.\n');clearInterval(tim._timer);tim.state='idle';cb();},// a tick during stop operation, show dotstick: function(cb){process.stdout.write(".");cb();},exit: 'error',},error: function(cb,state){console.log('An error occured in state',state);tim.state=state;cb();},_timer: null,// timer object to allow clearing the interval_i: 0,// animated clock});tim.on('end',function(){process.exit();});tim.on('error',function(){console.log('on-error');});tim.on('idle.start',function(){console.log("try 'go' the next time...");});vari=require('../lib/debugger')(tim,{verbose: false});More examples under examples/.
MIT