first commit

.gitignore

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+components
+build

Makefile

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+
+build: components index.js
+	@component build --dev
+
+components: component.json
+	@component install --dev
+
+clean:
+	rm -fr build components template.js
+
+test:
+	@./node_modules/.bin/mocha \
+		--reporter spec \
+		--require should
+
+.PHONY: clean test

component.json

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+{
+  "name": "attr",
+  "repo": "weepy/attr",
+  "description": "Simple property with get/set and events",
+  "version": "0.0.1",
+  "keywords": [],
+  "dependencies": {
+    "component/assert": "*",
+    "component/emitter": "*"
+  },
+  "development": {
+    "component/assert": "*"
+  },
+  "license": "MIT",
+  "scripts": [
+    "index.js"
+  ]
+}

index.js

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+var Emitter = require('emitter')
+
+var methods = {
+  incr: function (val) { 
+    return this(this.value + (val || 1)) 
+  },
+  toggle: function (val) { 
+    return this(!this.value) 
+  },
+  change: function(fn) {
+    if(fn) {
+      this.on('change', fn)          // setup observer
+    }
+    else { // force the change
+      var val = this()
+      this.emit('change', val, this.old)
+    }
+
+    return this
+  },
+  toString: function() { 
+    return "attr:"+JSON.stringify(this.value)
+  }
+}
+
+Emitter(methods)
+
+
+function createAttr(arg) {
+  function attr(v) {
+    if(arguments.length) {
+      attr.old = attr.value
+      attr.value = v
+      attr.emit('change', attr.value, attr.old)
+    }
+    return attr.value
+  }
+
+
+  for(var i in methods) attr[i] = methods[i]
+  // set to initial
+  attr.value = arg
+
+
+  return attr
+}
+
+createAttr.computed = function(fn) {
+  function cattr() {
+    cattr.old = cattr.value
+    cattr.value = fn()
+    cattr.emit('change', cattr.value, cattr.old)
+    return cattr.value
+  }
+
+
+  for(var i in methods) cattr[i] = methods[i]
+
+  cattr.value = fn()
+
+  // setup dependencies
+  cattr._depends = []
+
+
+  cattr.depends = function(deps) {
+    cattr._depends.forEach(function(dep) {
+      dep.off('change', changeFn)
+    })
+
+    cattr._depends = deps
+    deps.forEach(function(dep) {
+      dep.on('change', changeFn)
+    })
+    return cattr
+  }
+
+  function changeFn() {
+    cattr.change()
+  }
+
+  return cattr
+}
+
+module.exports = createAttr