Add groups_of.py.

groups_of.py

@@ -0,0 +1,28 @@
+import argparse
+import os
+import sys
+
+from voussoirkit import gentools
+from voussoirkit import pipeable
+
+def groupsof_argparse(args):
+    lines = pipeable.input(args.source, read_files=True, strip=True, skip_blank=True)
+    
+    chunks = gentools.chunk_generator(lines, args.chunk_size)
+    for chunk in chunks:
+        chunk = args.separator.join(chunk)
+        pipeable.output(chunk)
+
+def main(argv):
+    parser = argparse.ArgumentParser(description=__doc__)
+
+    parser.add_argument('source')
+    parser.add_argument('chunk_size', type=int)
+    parser.add_argument('--separator', dest='separator', default=',')
+    parser.set_defaults(func=groupsof_argparse)
+
+    args = parser.parse_args(argv)
+    return args.func(args)
+
+if __name__ == '__main__':
+    raise SystemExit(main(sys.argv[1:]))