Uses Node.js's asynchronous file functions to recrusivly read a directory structure.

RecursiveAsyncFileRead.coffee

app.get "/ls", (req, res)->
  path = "."
  directoryCount = 0
  edges = {} #key only for internal purpose {key:[], key2:[]}
  nodes = {} #stores data for nodes
  recursiveCalls = 0
  nodeId = (path)->
    "#{path}"
  recursionComplete = ()->
    console.log "-- Directory Count: ", directoryCount
    res.send {rootId:nodeId(path), edges:edges, nodes:nodes}
  getFiles = (path)->
    recursiveCalls++
    nodes[path] =
      name: path
      display: path.split('/').pop()
    console.log "--", path
    fs.readdir path, (err, files)->
      directoryProps = (dir)->
        recursiveCalls++
        #uses lstat so symlinks are not followed means no cycles in graph
        fs.lstat dir, (err, stats)-> 
          if err
            console.log "Error: ", err
            recursiveCalls--
          else if stats.isDirectory()
            #add it to our tree
            edgeKey = nodeId(path)
            edges[edgeKey] or= [] #initialize if new
            edges[edgeKey].push dir
            directoryCount++

            #recurse on it
            getFiles dir
          if --recursiveCalls == 0
            recursionComplete()
      recursiveCalls--
      if files
        directoryProps "#{path}/#{dir}" for dir in files
  getFiles path