Cakefile

fs     = require "fs"
path   = require "path"
rimraf = require "rimraf"
url    = require "url"

{exec, spawn} = require "child_process"

heroku = (callback) ->
  exec "heroku config --shell", (err, stdout, stderr) ->
    console.log "heroku config error: #{err}" if err

    config  = {}
    pattern = /^([^=]+)=(.*)$/gm

    config[m[1]] = m[2] while m = pattern.exec stdout
    callback config

# Spawn the given command, hook up stdin, stout, and stderr to the
# current process, and exit when the command does. Options are
# identical to spawn or exec, but env vars are merged with the parent
# process' values.

run = (cmd, args, opts) ->
  if opts?.env?
    for own k, v of process.env
      opts.env[k] = v unless opts.env[k]

  proc = spawn cmd, args, opts

  process.stdin.resume()
  process.stdin.pipe proc.stdin

  proc.stdout.pipe process.stdout
  proc.stderr.pipe process.stderr

  proc.on "exit", (code) ->
    process.exit code

task "console", "Run a CoffeeScript console w/lib.", ->
  run "coffee", ["--interactive"], env: { NODE_PATH: "lib" }

task "db", "Run a DB console.", ->
  run "mongo", ["local-dev"]

task "db:pull", "Grab a copy of the production DB.", ->
  heroku (cfg) ->
    dbURL = url.parse cfg.MONGOHQ_URL
    db    = dbURL.pathname.substr 1
    dir   = "tmp/mongodump"
    host  = dbURL.hostname
    port  = dbURL.port

    [username, password] = dbURL.auth.split ":"

    args = ["--host", host, "--port", port, "--db", db,
            "--username", username, "--password", password,
            "--out", dir]

    rimraf dir, (err) ->
      console.log "rimraf: #{err}" if err

      spawn("mongodump", args).on "exit", (code) ->
        console.log "mongodump exit: #{code}" if code isnt 0
        args = ["local-dev", "--eval", "db.dropDatabase()"]

        spawn("mongo", args).on "exit", (code) ->
          console.log "mongo exit: #{code}" if code isnt 0
          args = ["--drop", "--db", "local-dev", path.join(dir, db)]

          spawn("mongorestore", args).on "exit", (code) ->
            console.log "mongorestore exit: #{code}" if code isnt 0

            rimraf dir, (err) ->
              console.log "last rimraf: #{err}" if err