Re: [PATCHv2] git-diff: Clarify operation when not inside a repository.

[Junio C Hamano <gitster@pobox.com>]

worley@alum.mit.edu (Dale R. Worley) writes:

>> For now, I'll queue your version as-is modulo style fixes, while
>> waiting for others to help polishing the documentation better.
>
> It'd difficult to figure out how to describe it well.  In my
> opinion, the problem here is the DWIM nature of the command,
> ... My preference is ... But that's not how git-diff works.

So given the constraints, I think this is the best we can do.  As nobody
seems to be helping to polish the text, here is my attempt, on top
of your patch.

 Documentation/git-diff.txt | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/Documentation/git-diff.txt b/Documentation/git-diff.txt
index b1630ba..33fbd8c 100644
--- a/Documentation/git-diff.txt
+++ b/Documentation/git-diff.txt
@@ -28,11 +28,15 @@ two blob objects, or changes between two files on disk.
 	words, the differences are what you _could_ tell Git to
 	further add to the index but you still haven't.  You can
 	stage these changes by using linkgit:git-add[1].
-+
-If exactly two paths are given and at least one points outside
-the current repository, 'git diff' will compare the two files /
-directories. This behavior can be forced by --no-index or by
-executing 'git diff' outside of a working tree.
+
+'git diff' --no-index [--options] [--] [<path>...]::
+
+	This form is to compare the given two paths on the
+	filesystem.  You can omit the `--no-index` option when
+	running the command in a working tree controlled by Git and
+	at least one of the paths points outside the working tree,
+	or when running the command outside a working tree
+	controlled by Git.
 
 'git diff' [--options] --cached [<commit>] [--] [<path>...]::