Let "hg add" do nothing

[Neal Becker]

Steffen Kaiser wrote:

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> Hello,
> 
> is there a way to let have
> 
> $ hg add
> 
> (no arguments)
> 
> do nothing, but display the help or something harmless like that?
> 
> The default of "If no names are given, add all files in the repository."
> really bugs me.
> 

I brought up the same issue before.  I find the current behavior strange,
surprising, and harmful.

I vote +1 that hg should consistently treat all instances of 'hg [whatever]'
with no argument as a noop.  When we want to recursively operate, we should
use 'hg [whatever] [dir]', as in 'hg add .'.  In addition, commands that
currently take a possible directory argument, such as add, ci, should not
operate on a parent of the cwd unless explicitly asked to.