Merge pull request #411 from mabruzzo/tweak-concat.py

`concat.py` now ensures outdir exists

python_scripts/concat.py

@@ -12,6 +12,7 @@
 import argparse
 import datetime
 from functools import partial
+import os
 import pathlib
 
 import concat_internals
@@ -126,6 +127,16 @@ def main(args):
 
     #raise RuntimeError(repr(command_triples))
 
+    # create the output directory if it doesn't already exist...
+    abs_out_dir = os.path.abspath(args.output_directory)
+    if not os.path.exists(abs_out_dir):
+        if os.path.exists(os.path.dirname(abs_out_dir)):
+            os.mkdir(abs_out_dir)
+        else:
+            raise RuntimeError(
+                f"Can't create {args.output_directory} since the "
+                f"{args.output_directory}/.. directory doesn't already exist")
+
     for output in args.concat_outputs:
         print(f"concatenating {output}")
         for dset_kind, build_source_path, concat_fn in command_triples:
@@ -144,4 +155,4 @@ def main(args):
 
 
 if __name__ == '__main__':
-    main(parser.parse_args())
+    main(parser.parse_args())