The special case code to handle a runnable root command had some
problems. It was noticed that if you created a runnable root and a
subcommand. And the subcommand was then executed with both a valid and
invalid flag, the error message was about the valid flag being invalid.
For example
./command subcommand --goodflag=10 --badflag=10
Would fail and tell you that --goodflag was an invalid flag. Instead if
we just do away with the special Command.execute() for the root command
the parser for subcommand is what prints the error and it gets it
right...
If the command has not set an output explicitly everything will go to
stderr. This makes a lot of sense, but is a huge PITA for people who
want to be able to grep the help output. It is very common for users to
want to do
command --help | grep flag
This patch fixes that by default help output (but not error output like
an invalid command) to stdout instead of defaulting to stderr.
Eric Paris