first commit

.gitignore

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+node_modules/

package.json

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+{
+  "name": "pert",
+  "version": "0.0.1",
+  "description": "pert diagram calculator",
+  "main": "pert.coffee",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "http://github.com/fazo96/pert.git"
+  },
+  "author": "Enrico Fasoli (fazo96)",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/fazo96/pert/issues"
+  },
+  "homepage": "https://github.com/fazo96/pert",
+  "dependencies": {
+    "chalk": "^1.0.0"
+  }
+}

pert.coffee

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+#!/usr/bin/env coffee
+
+console.log "pert"
+
+list = [{id: 0, depends: [], duration: 2}, { id: 1, depends: [0], duration: 3},{id: 2, depends: [0,1], duration: 4}]
+
+maxa = (l) -> return Math.max.apply null, l
+
+# Find the activity with given id
+toActivity = (id) ->
+  item = {}
+  list.forEach (x) -> if x.id is id then item = x
+  return item
+
+# Find the item 
+calculateEndDay = (item) ->
+  if !item.startDay?
+    console.log "calculating start day of",item.id
+    item.startDay = calculateStartDay item
+  console.log "Start day of",item.id,":",item.startDay
+  item.endDay = item.startDay + item.duration
+  console.log "End Day of",item.id,":",item.endDay
+  return item.endDay
+
+# Find out which day the activity starts
+calculateStartDay = (item) ->
+  if item.depends.length is 0 then return item.startDay = 0
+  console.log "Deps:",item.depends.map(toActivity)
+  console.log "EndDays:",item.depends.map(toActivity).map(calculateEndDay)
+  max = maxa item.depends.map(toActivity).map(calculateEndDay)
+  console.log max
+  # write max delay time to each depend
+  item.depends.forEach (x) ->
+    console.log "Writing permittedDelay to dependency", x
+    i = toActivity x
+    i.permittedDelay = max - calculateEndDay(i)
+  return item.startDay = max
+
+# Find out which activity has the highest id
+highestID = -> return maxa(list.map (x) -> x.id)
+
+calculate = ->
+  calculateEndDay toActivity(highestID())
+  list.forEach (x) -> if !x.permittedDelay? then x.final = true
+  return list
+
+console.log calculate()