ShellPkg: Trim cmd parameters if -? is present

The presence of "-?" in a command line is equivalent to issuing
"help <cmd>" and displays the manual page of the command.
However the additional command specific parameters/flags
are also passed to the help command and are mis-interpreted
by the help command.

E.g. "ls -r -?" translates to "help ls -r"
"""
Shell> ls -r -?
help: Unknown flag - '-r'
"""

Update DoHelpUpdate() to only keep the command name and trim
additional command specific parameters. To pass "help" specific
flags while getting the manual page for a command, the usage
of the "help" command should be preferred over adding "-?".

Note:
As a side effect, issuing:
"""
Shell> -?
"""
- used to be translated to "help -?", i.e. request
  the manual for the help command
- is now translated to "help", i.e. request all the shell
  command available

Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>

0 files changed, 0 insertions, 0 deletions