A really basic hubot fabric wrapper. Works for me but this is just the basics. Set an environment variable for `HUBOT_FABRIC_PATH` and try `fab help` or `fabric help` to get a list of commands.

fabric.coffee

# fab <command> - to manage fabric
{spawn, exec}  = require 'child_process'

fabric_path = process.env.HUBOT_FABRIC_PATH
fabric_bin = "cd " + fabric_path + " && fab "

module.exports = (robot) ->
  robot.respond /(fab|fabric) ?([\w .-]+)/i, (msg) ->
    if msg.match[2] != undefined
      if msg.match[2] == "help"
        exec fabric_bin + " --list", (err, stdout, stderr) ->
          if err
            msg.send "ERROR: " + err
          else
            msg.send stdout
      else
        exec fabric_bin + msg.match[2], (err, stdout, stderr) ->
          msg.send stdout