CLI: Use stdout and stderr to print Messages with xmlschema-validate …

…command (#393)

* feat(cli-validate): Use stdout and stderr instead of print statement

This change helps users to distinguish between error messages and
others, e.g. in CI pipelines.

Signed-off-by: Sven Sager <s.sager@kunbus.com>

* feat(cli-validate): Use argument -v to print errors on stderr

The argument -v (verbosity) is not yet used in the validate function.
The specification of -v is now used in xmlschema-validate to obtain a
detailed error report on the stderr. This helps users to find the error
in their XML files at the mentioned place.

Signed-off-by: Sven Sager <s.sager@kunbus.com>

---------

Signed-off-by: Sven Sager <s.sager@kunbus.com>

xmlschema/cli.py

@@ -261,13 +261,16 @@ def validate():
  locations=args.locations, lazy=args.lazy, defuse=args.defuse))
  except (xmlschema.XMLSchemaException, URLError) as err:
  tot_errors += 1
- print(str(err))
+ sys.stderr.write(f"{err}\n")
  continue
  else:
  if not errors:
- print("{} is valid".format(filepath))
+ sys.stdout.write(f"{filepath} is valid\n")
  else:
  tot_errors += len(errors)
- print("{} is not valid".format(filepath))
+ sys.stderr.write(f"{filepath} is not valid\n")
+ if args.verbosity > 0:
+ for error in errors:
+ sys.stderr.write(f"{error}\n")
 
  sys.exit(tot_errors)