[Libguestfs] [PATCH] fish: show synopsis if command syntax is wrong

[Hu Tao]

On Mon, Dec 01, 2014 at 10:25:51AM +0800, Hu Tao wrote:
> On Fri, Nov 28, 2014 at 03:00:39PM +0100, Pino Toscano wrote:
> > On Friday 28 November 2014 17:55:51 Hu Tao wrote:
> > > This patch lets guestfish show command synopsis if the syntax of command issued
> > > by user is wrong, rather than telling user that the number of parameters is wrong.
> > 
> > The idea seems sound to me.
> > 
> > Shouldn't that be done also for fish commands? If so, just make
> > "synopsis" a function taking args and optargs, and use it in both
> > places.
> 
> fish commands do not have args and optargs in their definitions in file
> actions.ml. Also, fish commands' synopsises are printed out by inline
> codes, see run_alloc() for an example.
> 
> Surely we can reconstruct fish commands' definitions to take advantage
> of the auto-generation of synopsis done in this patch, but that can be
> another patch. I'll add this to my todo list.

After some dig, the only problem I don't know how to solve is commands
with variable-length parameters, such as copy-in. Its synopsis is:

  copy-in local [local ...] /remotedir

At first think its style could be:

  "style = RErr, [StringList "local"], [];

But it seems the syntax corresponding to StringList is:

  copy-in "local local" /remotedir

e.g. its a one parameter of List type, but not several parameters. Any
ideas?

Regards,
Hu