Show extension commands with spack -h (#41726)

* Execute `args.help` after setting main options so that extension commands will show with `spack -h`

---------

Co-authored-by: psakievich <psakiev@sandia.gov>

1 files changed, 7 insertions, 5 deletions

diff --git a/lib/spack/spack/main.py b/lib/spack/spack/main.py
index 9676d436dd..bff07ccbfb 100644
--- a/lib/spack/spack/main.py
+++ b/lib/spack/spack/main.py
@@ -950,14 +950,10 @@ def _main(argv=None):
         parser.print_help()
         return 1
 
-    # -h, -H, and -V are special as they do not require a command, but
-    # all the other options do nothing without a command.
+    # version is special as it does not require a command or loading and additional infrastructure
     if args.version:
         print(get_version())
         return 0
-    elif args.help:
-        sys.stdout.write(parser.format_help(level=args.help))
-        return 0
 
     # ------------------------------------------------------------------------
     # This part of the `main()` sets up Spack's configuration.
@@ -996,6 +992,12 @@ def _main(argv=None):
         print_setup_info(*args.print_shell_vars.split(","))
         return 0
 
+    # -h and -H are special as they do not require a command, but
+    # all the other options do nothing without a command.
+    if args.help:
+        sys.stdout.write(parser.format_help(level=args.help))
+        return 0
+
     # At this point we've considered all the options to spack itself, so we
     # need a command or we're done.
     if not args.command: