fixed Rob's mistake, added some documentation

dSQ.py

@@ -4,21 +4,28 @@
 import argparse
 import sys
 
+desc = """Dead Simple Queue
+A simple utility for submitting a list of tasks as a job array, using sbatch. Tasks that return non-zero exit codes will be output to the job_<slurm job id>.REMAINING file. The job_<slurm job id>.STATUS file will contain info about the tasks run and contains the following tab-separated columns:
+Task_ID, Exit_Code, Time_Started, Time_Ended, Time_Elapsed, Task
+
+run sbatch --help for more info on sbatch options."""
+
 #use fancy argument parsing
-parser = argparse.ArgumentParser()
-parser.add_argument('taskfile', type=argparse.FileType('r'))
+parser = argparse.ArgumentParser(description=desc, usage='%(prog)s taskfile [slurm args] ...', 
+                                 formatter_class=argparse.RawTextHelpFormatter)
+parser.add_argument('taskfile', type=argparse.FileType('r'), help="Task file, one task per line")
 #capture the rest of the arguments
-parser.add_argument('rest', nargs=argparse.REMAINDER)
+parser.add_argument('slurm_args', nargs=argparse.REMAINDER, help="flags and arguments to sbatch") 
 args = parser.parse_args()
 
 num_tasks = sum(1 for line in args.taskfile)
 
 script = os.path.join(os.path.dirname(os.path.abspath(sys.argv[0])), 'dSQbatch.py')
 
 cmd="sbatch --array=0-{} {} {} {}".format(num_tasks-1,
-                                          " ".join(args.rest),
+                                          " ".join(args.slurm_args),
                                           script,
                                           args.taskfile.name)
 
-ret=subprocess.call("foobar", shell=True)
+ret=subprocess.call(cmd, shell=True)
 sys.exit(ret)