Re: [PATCH v3] doc-diff: don't `cd_to_toplevel`

[Jeff King <peff@peff.net>]

On Mon, Feb 04, 2019 at 09:50:37PM +0100, Martin Ågren wrote:

> `usage` tries to call $0, which might very well be "./doc-diff", so if
> we `cd_to_toplevel` before calling `usage`, we'll end with an error to
> the effect of "./doc-diff: not found" rather than a friendly `doc-diff
> -h` output. This regressed in ad51743007 ("doc-diff: add --clean mode to
> remove temporary working gunk", 2018-08-31) where we moved the call to
> `cd_to_toplevel` to much earlier.
> 
> A general fix might be to teach git-sh-setup to save away the absolute
> path for $0 and then use that, instead. I'm not aware of any portable
> way of doing that, see, e.g., d2addc3b96 ("t7800: readlink may not be
> available", 2016-05-31).
> 
> An early version of this patch moved `cd_to_toplevel` back to where it
> was before ad51743007 and taught the "--clean" code to cd on its own.
> But let's try instead to get rid of the cd-ing entirely. We don't really
> need it and we can work with absolute paths instead. There's just one
> use of $PWD that we need to adjust by simply dropping it.

Thanks, this version looks great to me!

-Peff