commit: Abort if a file on command line is invalid

Exit if a given file does not conform to the naming scheme.

Fixes #75

bin/commit

@@ -241,8 +241,9 @@ def user_barrier(prompt):
     %prompt)
   input()
 
-# processes the input directories for fCreateSourceDirectories or fDirectory
-# and yields all files found
+# Yield all files to be processed according to the file names given on the
+# command line and fDirectory, fRecurse. This could contain non-.pdf/.source
+# files.
 def allFiles():
   global files
   if fDirectory:
@@ -283,6 +284,10 @@ def allExams():
     try:
       n=klausurarchiv.namingscheme.New(fn)
     except:
+      if not fDirectory:
+        print("\x1b[31;1mError\x1b[30;0m: %s does not conform to naming "
+          "scheme!"%(fn))
+        exit(1)
       continue
 
     if os.path.isdir(fn):