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From 5be233541a4fc2e395087fe51a30a3664165e8bc Mon Sep 17 00:00:00 2001
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From: Phillip Wood <phillip.wood@dunelm.org.uk>
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Date: Fri, 1 Jun 2018 18:46:44 +0100
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Subject: [PATCH] add -p: fix counting empty context lines in edited patches
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recount_edited_hunk() introduced in commit 2b8ea7f3c7 ("add -p:
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calculate offset delta for edited patches", 2018-03-05) required all
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context lines to start with a space, empty lines are not counted. This
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was intended to avoid any recounting problems if the user had
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introduced empty lines at the end when editing the patch. However this
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introduced a regression into 'git add -p' as it seems it is common for
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editors to strip the trailing whitespace from empty context lines when
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patches are edited thereby introducing empty lines that should be
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counted. 'git apply' knows how to deal with such empty lines and POSIX
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states that whether or not there is an space on an empty context line
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is implementation defined [1].
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Fix the regression by counting lines consist solely of a newline as
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well as lines starting with a space as context lines and add a test to
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prevent future regressions.
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[1] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/diff.html
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Reported-by: Mahmoud Al-Qudsi <mqudsi@neosmart.net>
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Reported-by: Oliver Joseph Ash <oliverjash@gmail.com>
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Reported-by: Jeff Felchner <jfelchner1@gmail.com>
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Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
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---
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git-add--interactive.perl | 2 +-
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t/t3701-add-interactive.sh | 43 ++++++++++++++++++++++++++++++++++++++
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2 files changed, 44 insertions(+), 1 deletion(-)
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diff --git a/git-add--interactive.perl b/git-add--interactive.perl
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index c1f52e457f..befbe8c749 100755
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--- a/git-add--interactive.perl
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+++ b/git-add--interactive.perl
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@@ -1055,7 +1055,7 @@ sub recount_edited_hunk {
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$o_cnt++;
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} elsif ($mode eq '+') {
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$n_cnt++;
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- } elsif ($mode eq ' ') {
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+ } elsif ($mode eq ' ' or $_ eq "\n") {
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$o_cnt++;
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$n_cnt++;
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}
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diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
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index b170fb02b8..3e9139dca8 100755
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--- a/t/t3701-add-interactive.sh
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+++ b/t/t3701-add-interactive.sh
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@@ -175,6 +175,49 @@ test_expect_success 'real edit works' '
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diff_cmp expected output
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'
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+test_expect_success 'setup file' '
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+ test_write_lines a "" b "" c >file &&
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+ git add file &&
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+ test_write_lines a "" d "" c >file
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+'
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+
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+test_expect_success 'setup patch' '
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+ SP=" " &&
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+ NULL="" &&
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+ cat >patch <<-EOF
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+ @@ -1,4 +1,4 @@
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+ a
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+ $NULL
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+ -b
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+ +f
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+ $SP
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+ c
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+ EOF
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+'
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+
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+test_expect_success 'setup expected' '
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+ cat >expected <<-EOF
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+ diff --git a/file b/file
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+ index b5dd6c9..f910ae9 100644
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+ --- a/file
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+ +++ b/file
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+ @@ -1,5 +1,5 @@
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+ a
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+ $SP
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+ -f
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+ +d
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+ $SP
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+ c
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+ EOF
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+'
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+
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+test_expect_success 'edit can strip spaces from empty context lines' '
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+ test_write_lines e n q | git add -p 2>error &&
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+ test_must_be_empty error &&
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+ git diff >output &&
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+ diff_cmp expected output
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+'
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+
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test_expect_success 'skip files similarly as commit -a' '
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git reset &&
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echo file >.gitignore &&
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