Turn deprecated commands into errors.

docs/markdown/snippets/del-old-names.md

@@ -0,0 +1,7 @@
+## Old command names are now errors
+
+Old executable names `mesonintrospect`, `mesonconf`, `mesonrewriter`
+and `mesontest` have been deprecated for a long time. Starting from
+this versino they no longer do anything but instead always error
+out. All functionality is available as subcommands in the main `meson`
+binary.

mesonconf.py

@@ -14,10 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from mesonbuild import mesonmain
 import sys
 
 if __name__ == '__main__':
-    print('Warning: This executable is deprecated. Use "meson configure" instead.',
+    sys.exit('Error: This executable is no more. Use "meson configure" instead.')
-          file=sys.stderr)
-    sys.exit(mesonmain.run(['configure'] + sys.argv[1:]))

mesonintrospect.py

@@ -14,10 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from mesonbuild import mesonmain
 import sys
 
 if __name__ == '__main__':
-    print('Warning: This executable is deprecated. Use "meson introspect" instead.',
+    sys.exit('Error: This executable is no more. Use "meson introspect" instead.')
-          file=sys.stderr)
-    sys.exit(mesonmain.run(['introspect'] + sys.argv[1:]))

mesonrewriter.py

@@ -23,10 +23,7 @@
 # - move targets
 # - reindent?
 
-from mesonbuild import mesonmain
 import sys
 
 if __name__ == '__main__':
-    print('Warning: This executable is deprecated. Use "meson rewrite" instead.',
+    sys.exit('Error: This executable is no more. Use "meson rewrite" instead.')
-          file=sys.stderr)
-    sys.exit(mesonmain.run(['rewrite'] + sys.argv[1:]))

mesontest.py

@@ -16,10 +16,7 @@
 
 # A tool to run tests in many different ways.
 
-from mesonbuild import mesonmain
 import sys
 
 if __name__ == '__main__':
-    print('Warning: This executable is deprecated. Use "meson test" instead.',
+    sys.exit('Error: This executable is no more. Use "meson test" instead.')
-          file=sys.stderr)
-    sys.exit(mesonmain.run(['test'] + sys.argv[1:]))