On Thu, Nov 15, 2012 at 08:25:26AM -0800, Jeff King wrote:

> > Thanks, this version looks good to me.
> Oh wait. I did not look closely enough. The point was to move the option
> parser _out_ of git_diff_ui_config into git_diff_basic_config, so that
> it only triggers for porcelain, not plumbing.

Oh no, I am having a muddled morning. It _is_ right. We want to move it
out of basic into ui. Sorry for the noise. I just woke up and am
thinking backwards.

It may be worth squashing this test into patch 3:

diff --git a/t/t4041-diff-submodule-option.sh b/t/t4041-diff-submodule-option.sh
index e401814..023439f 100755
--- a/t/t4041-diff-submodule-option.sh
+++ b/t/t4041-diff-submodule-option.sh
@@ -72,6 +72,21 @@ EOF
        test_cmp expected actual
+test_expect_success 'diff.submodule does not affect plumbing' '
+       test_config diff.submodule log &&
+       git diff-index -p HEAD >actual &&
+       cat >expected <<-EOF &&
+       diff --git a/sm1 b/sm1
+       new file mode 160000
+       index 0000000..a2c4dab
+       --- /dev/null
+       +++ b/sm1
+       @@ -0,0 +1 @@
+       +Subproject commit $fullhead1
+       EOF
+       test_cmp expected actual
 commit_file sm1 &&
 head2=$(add_file sm1 foo3)

BTW, while writing the test, I noticed two minor nits with your tests:

  1. They can use test_config, which is simpler (you do not need to
     unset yourself after the test) and safer (the unset happens via
     test_when_finished, so it works even if the test fails).

  2. You can still indent expected output when using <<-.

I don't know if it is worth re-rolling for them.

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