adds the trio picker functionality to the minute gridder

gridded_glm/libexec/_minute_gridder.py

@@ -56,6 +56,10 @@ def create_parser():
                         type=float, help='center latitude (required for meso)')
     parser.add_argument('--ctr-lon', metavar='longitude',
                         type=float, help='center longitude (required for meso)')
+    parser.add_argument('-1', "--realtime", default=False, action='store_true',
+                        help="enable 'realtime' mode, where we expect only one input file,\n"
+                        "find the surrounding trio, and automatically determine if a full minute\n"
+                        "of data is available (default: off)")
     # from Requirements: "Input is one or more GLM LCFA (L2+) files in mission standard format (nominally three 20-second input files)"
     parser.add_argument(dest='filenames', metavar='filename', nargs='+')
     return parser
@@ -110,6 +114,19 @@ def grid_setup(args, work_dir=os.getcwd()):
     min_events = None
     min_groups = None
 
+    if args.realtime:
+        if len(args.filenames) != 1:
+            log.error("realtime mode only accepts one input file")
+            exit(1)
+        glminfo = parse_glm_filename(os.path.basename(args.filenames[0]))
+
+        globstring = "{}_{}_{}_s{}*".format(glminfo[0], glminfo[1], glminfo[2], glminfo[3].strftime("%Y%j%H%M"))
+        fileglob = glob(os.path.join(os.path.dirname(args.filenames[0]), globstring))
+        if len(fileglob) != 3:
+            print("There are not (yet) three GLM files from this minute. This may be expected. Exiting.")
+            exit(0)
+        args.filenames = fileglob
+
     try:
         start_time, end_time = get_start_end(args.filenames)
     except ValueError: