cli: default to excel output, remove warning

docs/manual/chapters/cli-reference.qmd

@@ -31,7 +31,8 @@ Options:
 
 - `--outfmt=FORMAT`
 
-    output format (excel or csv), defaults to input format
+    output format (`excel` or `csv`), defaults to input format when input is a
+    file and `excel` when it's a database
 
 - `--outdir=PATH`
 

src/odm_sharing/tools/share.py

@@ -152,14 +152,13 @@ def get_excel_writer(in_name: str, debug: bool, org: str, outdir: str,
         return None
 
 
-def infer_outfmt(path: str) -> Optional[OutFmt]:
+def infer_outfmt(path: str) -> OutFmt:
     '''returns None when not recognized'''
     (_, ext) = os.path.splitext(path)
     if ext == '.csv':
         return OutFmt.CSV
-    elif ext == '.xlsx':
+    else:
         return OutFmt.EXCEL
-    return None
 
 
 def share(
@@ -175,13 +174,7 @@ def share(
     in_name = Path(input).stem
 
     if outfmt == OutFmt.AUTO:
-        fmt = infer_outfmt(input)
-        if not fmt:
-            logging.warning('unable to infer output format from input path, ' +
-                            'defaulting to excel')
-            outfmt = OutFmt.EXCEL
-        else:
-            outfmt = fmt
+        outfmt = infer_outfmt(input)
 
     logging.info(f'loading schema {qt(schema_filename)}')
     try: