+argument validation for markdown file test

Usign regex to check if each file is a markdown file or not, skipping
any that are

1 files changed, 12 insertions, 0 deletions

diff --git a/converter.py b/converter.py
index 07944f4..79624f7 100644
--- a/converter.py
+++ b/converter.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 
 from optparse import OptionParser
+from re import search, sub
 """Command line arguments"""
 usage = "usage: %prog [options] file..."
 parser = OptionParser(usage=usage)
@@ -13,3 +14,14 @@ parser.add_option('-o', '--output-type', dest='output_type',
 (options, args) = parser.parse_args()
 
 
+"""Valid argument testing
+TODO: Add support for directories
+"""
+markdown_files = []
+for file in args:
+    if search(".md", file) is not None:
+        # Is a markdown file
+        markdown_files.append(file)
+    else:
+        print(file, "is not a markdown file, skipping")
+