[U-Boot] [PATCH 0/2] cmd: auto-complete args starting with a $

[Boris Brezillon <boris.brezillon@bootlin.com>]

On Tue, 04 Dec 2018 10:44:19 +0100
Wolfgang Denk <wd@denx.de> wrote:

> Dear Boris,
> 
> In message <20181203220726.19370-1-boris.brezillon@bootlin.com> you wrote:
> > 
> > It's pretty common to pass arguments that start with a $ and are then
> > expanded by the shell, and I'm this kind of lazy guy that hits tab all
> > the time and expects the shell to suggest something appropriate. So
> > here is a patchset adding support for ${} auto-completion and using the
> > new helper from the mtd command.  
> 
> You mean, this feature depends on MTD support?  this is not goot.

Not at all, MTD is just the first user of this dollar_complete()
helper. That's what I meant.

> 
> Also, you should make this feature configurable.  Not everybody may
> want to use it or may have the memory available.

It already depends on CONFIG_AUTO_COMPLETE, and each command has to
explicitly call the helper to support ${} auto-completion. Not that $
auto-completion only makes sense for some arguments, not all of them.
It's the responsibility of the command itself to decide when it should
be used.

> 
> Technically - should autocompletion not be prevented for escaped
> '$' characters, i. e. hitting TAB after a '\$' sequence should NOT
> expand?

It's already the case. The argument has to start with $ or ${ to be
auto-completed.