simplify setup.py warning messages

setup.py

@@ -7,79 +7,18 @@
 import sys
 from setuptools import setup
 
-# First provide helpful messages if contributors try and run legacy commands
-# for tests or docs.
+# First provide a helpful message if contributors try to run legacy commands.
 
-API_HELP = """
-Note: Generating api.rst files is no longer done using 'python setup.py api'. Instead
-you will need to run:
-
-    desi_api_file
-
-which is part of the desiutil package. If you don't already have desiutil installed, you can install it with:
-
-    pip install desiutil
-"""
-
-MODULE_HELP = """
-Note: Generating Module files is no longer done using 'python setup.py api'. Instead
-you will need to run:
-
-    desiInstall
-
-or
-
-    desi_module_file
-
-depending on your exact situation.  desiInstall is preferred.  Both commands are
-part of the desiutil package. If you don't already have desiutil installed, you can install it with:
-
-    pip install desiutil
-"""
-
-VERSION_HELP = """
-Note: Generating version strings is no longer done using 'python setup.py version'. Instead
-you will need to run:
-
-    desi_set_version
-
-which is part of the desiutil package. If you don't already have desiutil installed, you can install it with:
-
-    pip install desiutil
-"""
-
-TEST_HELP = """
-Note: running tests is no longer done using 'python setup.py test'. Instead
-you will need to run:
-
-    pytest
-
-If you don't already have pytest installed, you can install it with:
-
-    pip install pytest
-"""
-
-DOCS_HELP = """
-Note: building the documentation is no longer done using
-'python setup.py {0}'. Instead you will need to run:
-
-    sphinx-build -W --keep-going -b html doc doc/_build/html
-
-If you don't already have Sphinx installed, you can install it with:
-
-    pip install Sphinx
+HELP = """This command is no longer supported.
+See https://desiutil.readthedocs.io/en/module-script/helpers.html#replacing-setup-py
+for replacements.
 """
 
-message = {'api': API_HELP,
-           'module_file': MODULE_HELP,
-           'test': TEST_HELP,
-           'version': VERSION_HELP,
-           'build_docs': DOCS_HELP.format('build_docs'),
-           'build_sphinx': DOCS_HELP.format('build_sphinx'), }
+message = ('api', 'build_docs', 'build_sphinx', 'module_file', 'test', 'version')
 
 for m in message:
     if m in sys.argv:
-        print(message[m])
+        print(HELP)
         sys.exit(1)
 
 setup()