Replace dashes with underscores, define entry point

.gitignore

@@ -139,3 +139,4 @@ dmypy.json
 cython_debug/
 
 testfiles
+*.csv

frontmatter_to_csv/convert.py

@@ -25,7 +25,9 @@ fields = {
 }
 
 
-def convert(directory="testfiles", outputfile="test.csv"):
+def convert(directory="f", outputfile="test.csv"):
+    if not os.path.isdir(directory):
+        exit(f"The directory {directory} does not exist!")
     with open(outputfile, "w", newline="") as csvfile:
         writer = csv.DictWriter(csvfile, fieldnames=fields.values())
         writer.writeheader()

setup.cfg

@@ -15,9 +15,9 @@ classifiers =
     Operating System :: OS Independent
 
 [options]
-packages = frontmatter-to-csv
+packages = frontmatter_to_csv
 python_requires = >=3.6
 
 [options.entry_points]
 console_scripts =
-    frontmatter-to-csv = frontmatter-to-csv
+    frontmatter-to-csv = frontmatter_to_csv.convert:convert