Initial Commit

.gitignore

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+npm-debug.log
+node_modules
+tests/config.json

README.md

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+BPM
+===
+
+Calculate BPM by tapping
+
+Install
+------
+
+Install the command line tool `bpm`
+
+    npm install -g bpm
+
+Install locally to use as a module
+
+    npm install bpm
+
+Usage
+-----
+
+Command line
+
+    bpm
+
+As a module
+
+``` js
+var BPM = require('bpm');
+var b = new BPM();
+```
+
+Example
+-------
+
+### Command line tool
+
+Run `bpm` on the command line to tap out the beats, and let it calculate the
+average BPM
+
+    $ bpm
+    Tap when ready... ctrl-c to break
+    { count: 1 }
+    { avg: 69.52491309385863, ms: 863, count: 2 }
+    { avg: 67.6056338028169, ms: 912, count: 3 }
+    { avg: 66.98920729438035, ms: 912, count: 4 }
+    { avg: 66.6851903306474, ms: 912, count: 5 }
+    { avg: 66.386368665634, ms: 920, count: 6 }
+    { avg: 66.4819944598338, ms: 896, count: 7 }
+
+In the output above you can see that it sits there waiting for you to tap.  When you
+start tapping, it starts calculating the average BPM, and every tap it prints 3 fields.
+
+* `avg` - The average BPM
+* `ms` - The time in milliseconds from the previous to the current tap
+* `count` - How many times you have tapped
+
+### Node Module
+
+``` js
+var BPM = require('bpm'),
+    b = new BPM();
+
+b.tap();
+setTimeout(function() {
+  console.log(b.tap());
+}, 1000);
+```
+yields
+``` json
+{
+  "avg": 59.46481665014866,
+  "ms": 1009,
+  "count": 2
+}
+```
+
+Functions
+---------
+
+### var b = new BPM()
+
+Create a new BPM object
+
+### b.tap()
+
+Trigger the tap event, it returns an object showing the current BPM statistics
+
+### b.reset()
+
+Reset the obj
+
+Test
+----
+
+    npm test
+
+License
+-------
+
+MIT Licensed

bin/bpm.js

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+#!/usr/bin/env node
+/**
+ * Calculate BPM on the command line
+ *
+ * Author: Dave Eddy <dave@daveeddy.com>
+ * License: MIT
+ */
+
+// Requires and such
+var BPM = require('../'),
+    b = new BPM(),
+    path = require('path'),
+    util = require('util'),
+    keypress = require('keypress'),
+    version = require('../package.json').version,
+    args = process.argv.slice(2);
+
+/**
+ * Usage
+ *
+ * return the usage message
+ */
+function usage() {
+  return util.format([
+    'Usage: %s',
+    '',
+    'Tap on the command line to calculate BPM',
+    '',
+    'Options',
+    '  --help    | -h: Print this help message and exit',
+    '  --version | -v: Print the version number and exit',
+    ''
+  ].join('\n'), path.basename(process.argv[1]));
+}
+
+// Command line arguments
+switch (args[0]) {
+  case '-h': case '--help':
+    console.log(usage());
+    process.exit(0);
+    break;
+  case '-v': case '--version':
+    console.log(version);
+    process.exit(0);
+    break;
+}
+
+keypress(process.stdin);
+
+console.log('Tap when ready... ctrl-c to break');
+process.stdin.on('keypress', function(c, key) {
+  if (key && key.ctrl && key.name == 'c') process.exit(0);
+  console.log(b.tap());
+});
+
+process.stdin.setRawMode(true);
+process.stdin.resume();

index.js

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+/**
+ * Calculate BPM
+ */
+
+module.exports = BPM;
+module.exports.BPM = BPM;
+
+function BPM() {
+  this.count = 0;
+  this.ts = 0;
+  this.old_ts = 0;
+}
+
+BPM.prototype.tap = function() {
+  this.ts = new Date().getTime();
+  if (!this.first_ts) this.first_ts = this.ts;
+
+  var ret = {};
+
+  // ignore the first tap
+  if (this.old_ts) {
+    var ms = this.ts - this.old_ts;
+
+    var avg = 60000 * this.count / (this.ts - this.first_ts);
+
+    ret.avg = avg;
+    ret.ms = ms;
+  }
+
+  ret.count = ++this.count;
+
+  // Store the old timestamp
+  this.old_ts = this.ts;
+  return ret;
+};
+
+BPM.prototype.reset = function() {
+  this.count = 0;
+  this.ts = 0;
+  this.old_ts = 0;
+  this.first_ts = 0;
+};

package.json

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+{
+  "name": "bpm",
+  "description": "Calculate BPM by tapping",
+  "version": "0.0.0",
+  "author": "Dave Eddy <dave@daveeddy.com> (http://www.daveeddy.com)",
+  "contributors": [],
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/bahamas10/node-bpm.git"
+  },
+  "scripts": {
+    "test": "for f in tests/*.js; do echo \"$f\"; node \"$f\" || exit 1; done; echo 'Passed!'; exit 0"
+  },
+  "dependencies": {
+    "keypress": "~0.1.0"
+  },
+  "bin": {
+    "bpm": "./bin/bpm.js"
+  },
+  "devDependencies": {},
+  "optionalDependencies": {},
+  "engines": {
+    "node": "*"
+  },
+  "keywords": [
+    "bpm",
+    "beat",
+    "tap"
+  ]
+}

tests/120.js

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+var BPM = require('../'),
+    b = new BPM();
+
+setInterval(function() {
+  var s = b.tap();
+  console.log(s);
+  if (s.count > 10) process.exit(0);
+}, 500);

tests/240.js

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+var BPM = require('../'),
+    b = new BPM();
+
+setInterval(function() {
+  var s = b.tap();
+  console.log(s);
+  if (s.count > 20) process.exit(0);
+}, 250);

tests/60.js

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+var BPM = require('../'),
+    b = new BPM();
+
+setInterval(function() {
+  var s = b.tap();
+  console.log(s);
+  if (s.count > 10) process.exit(0);
+}, 1000);