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Re: [PATCH] git.el: handle default excludesfile properly

On Sat, Mar 3, 2018 at 8:36 PM, Dorab Patel <dorabpatel@xxxxxxxxx> wrote:
> Correct me if I'm wrong, but my understanding, from
> https://git-scm.com/docs/gitignore, is that $HOME/.gitignore is used
> only if it is specified as the value of core.excludesfile in
> ~/.gitconfig. It is not used by default. If that is so, then the
> proposed (and original) code works. The changes I am proposing handle
> the default case, when core.excludesfile is not specified.

You're right. I must have set core.excludesfile so long ago that I
forgot about it and assumed $HOME/.gitignore was consulted by default.

> Looking deeper into how the function git-get-exclude-files is used, I
> see that it is only being called from git-run-ls-files-with-excludes.
> So, perhaps, a better (or additional) fix might be to add the
> parameter "--exclude-standard" in the call to git-run-ls-files from
> within git-run-ls-files-with-excludes. And remove the need for
> get-get-exclude-files altogether.  Presumably, "--exclude-standard"
> handles the default case with/without XDG_CONFIG_HOME correctly. The
> question I'd have then is: why didn't the original author use that
> option? Either I'm missing something? Or the option was added later,
> after the original code was written? Or something else?

Using --exclude-standard rather than --exclude-from and retiring
git-get-exclude-files() makes sense to me.

As for why the original author didn't use --exclude-standard, project
history tells us that. In particular, git-get-exclude-files() was
implemented by 274e13e0e9 (git.el: Take into account the
core.excludesfile config option., 2007-07-31), whereas
--exclude-standard was introduced by 8e7b07c8a7 (git-ls-files: add
--exclude-standard, 2007-11-15), three and a half months later.

If you do re-roll to use --exclude-standard, then it would be good for
your commit message to explain this history, citing the relevant