fix: Prompt the user if additional input is expected in csvjoin, csvs…

…ql and csvstack, closes #1169

CHANGELOG.rst

@@ -9,6 +9,7 @@ Unreleased
 * :doc:`/scripts/csvstat` adds a :code:`--non-nulls` option to only output counts of non-null values.
 * :doc:`/scripts/csvstat` adds a :code:`--max-precision` option to only output the most decimal places.
 * feat: Add a :code:`--null-value` option to commands with the :code:`--blanks` option, to convert additional values to NULL.
+* fix: Prompt the user if additional input is expected (i.e. if no input file or piped data is provided) in :doc:`/scripts/csvjoin`, :doc:`/scripts/csvsql` and :doc:`/scripts/csvstack`.
 * fix: No longer errors if a NUL byte occurs in an input file.
 * Add Python 3.12 support.
 

csvkit/utilities/csvjoin.py

@@ -1,8 +1,10 @@
 #!/usr/bin/env python
 
+import sys
+
 import agate
 
-from csvkit.cli import CSVKitUtility, match_column_identifier
+from csvkit.cli import CSVKitUtility, isatty, match_column_identifier
 
 
 class CSVJoin(CSVKitUtility):
@@ -40,14 +42,14 @@ def add_arguments(self):
             help='Disable type inference when parsing CSV input.')
 
     def main(self):
+        if isatty(sys.stdin) and self.args.input_paths == ['-']:
+            sys.stderr.write('No input file or piped data provided. Waiting for standard input:\n')
+
         self.input_files = []
 
         for path in self.args.input_paths:
             self.input_files.append(self._open_input_file(path))
 
-        if len(self.input_files) < 1:
-            self.argparser.error('You must specify at least one file to join.')
-
         if self.args.columns:
             join_column_names = self._parse_join_column_names(self.args.columns)
 

csvkit/utilities/csvsql.py

@@ -83,7 +83,7 @@ def add_arguments(self):
             help='Chunk size for batch insert into the table. Requires --insert.')
 
     def main(self):
-        if isatty(sys.stdin) and not self.args.input_paths:
+        if isatty(sys.stdin) and self.args.input_paths == ['-']:
             self.argparser.error('You must provide an input file or piped data.')
 
         self.input_files = []

csvkit/utilities/csvstack.py

@@ -41,7 +41,7 @@ def add_arguments(self):
             help='Use the filename of each input file as its grouping value. When specified, -g will be ignored.')
 
     def main(self):
-        if isatty(sys.stdin) and not self.args.input_paths:
+        if isatty(sys.stdin) and self.args.input_paths == ['-']:
             sys.stderr.write('No input file or piped data provided. Waiting for standard input:\n')
 
         has_groups = self.args.groups is not None or self.args.group_by_filenames