Only print unique messages in CLI

1 files changed, 12 insertions, 2 deletions

diff --git a/scripts/mammoth b/scripts/mammoth
index f4865fb..be7ad10 100644
--- a/scripts/mammoth
+++ b/scripts/mammoth
@@ -34,14 +34,24 @@ def main():
             convert_image=convert_image,
             output_format=args.output_format,
         )
-        for message in result.messages:
-            sys.stderr.write(message.message)
+        for message in _unique([message.message for message in result.messages]):
+            sys.stderr.write(message)
             sys.stderr.write("\n")
         
         with _open_output(output_path) as output:
             output.write(result.value)
 
 
+def _unique(values):
+    output = []
+    seen = set()
+    for value in values:
+        if value not in seen:
+            seen.add(value)
+            output.append(value)
+    return output
+
+
 class ImageWriter(object):
     def __init__(self, output_dir):
         self._output_dir = output_dir