add-interactive: handle deletion of empty files

Usually we show deletion as a big hunk deleting all of the
file's text. However, for files with no content, the diff
shows just the 'deleted file mode ...' line. This patch
cause "add -p" (and related commands) to recognize that line
and explicitly ask about deleting the file.

We only add the "stage this deletion" hunk for empty files,
since other files will already ask about the big content
deletion hunk. We could also change those files to simply
display "stage this deletion", but showing the actual
deleted content is probably what an interactive user wants.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index 392efb913f7c2ff13bbbb46e4414325b71e07676..35f4ef11de581af129deb24cf9160fe817e4551b 100755 (executable)
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -731,14 +731,17 @@ sub parse_diff_header {
 
        my $head = { TEXT => [], DISPLAY => [], TYPE => 'header' };
        my $mode = { TEXT => [], DISPLAY => [], TYPE => 'mode' };
+       my $deletion = { TEXT => [], DISPLAY => [], TYPE => 'deletion' };
 
        for (my $i = 0; $i < @{$src->{TEXT}}; $i++) {
-               my $dest = $src->{TEXT}->[$i] =~ /^(old|new) mode (\d+)$/ ?
-                       $mode : $head;
+               my $dest =
+                  $src->{TEXT}->[$i] =~ /^(old|new) mode (\d+)$/ ? $mode :
+                  $src->{TEXT}->[$i] =~ /^deleted file/ ? $deletion :
+                  $head;
                push @{$dest->{TEXT}}, $src->{TEXT}->[$i];
                push @{$dest->{DISPLAY}}, $src->{DISPLAY}->[$i];
        }
-       return ($head, $mode);
+       return ($head, $mode, $deletion);
 }
 
 sub hunk_splittable {
@@ -1206,7 +1209,7 @@ sub patch_update_file {
        my ($ix, $num);
        my $path = shift;
        my ($head, @hunk) = parse_diff($path);
-       ($head, my $mode) = parse_diff_header($head);
+       ($head, my $mode, my $deletion) = parse_diff_header($head);
        for (@{$head->{DISPLAY}}) {
                print;
        }
@@ -1214,6 +1217,9 @@ sub patch_update_file {
        if (@{$mode->{TEXT}}) {
                unshift @hunk, $mode;
        }
+       if (@{$deletion->{TEXT}} && !@hunk) {
+               @hunk = ($deletion);
+       }
 
        $num = scalar @hunk;
        $ix = 0;
@@ -1267,7 +1273,9 @@ sub patch_update_file {
                        print;
                }
                print colored $prompt_color, $patch_mode_flavour{VERB},
-                 ($hunk[$ix]{TYPE} eq 'mode' ? ' mode change' : ' this hunk'),
+                 ($hunk[$ix]{TYPE} eq 'mode' ? ' mode change' :
+                  $hunk[$ix]{TYPE} eq 'deletion' ? ' deletion' :
+                  ' this hunk'),
                  $patch_mode_flavour{TARGET},
                  " [y,n,q,a,d,/$other,?]? ";
                my $line = prompt_single_character;

diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index 62fd65e18d434711176ddb1c22ef057b879e992a..aa5909b14c822227bc8d9e7f2425b35458c9be03 100755 (executable)
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -214,4 +214,21 @@ test_expect_success 'add first line works' '
        test_cmp expected diff
 '
 
+cat >expected <<EOF
+diff --git a/empty b/empty
+deleted file mode 100644
+index e69de29..0000000
+EOF
+
+test_expect_success 'deleting an empty file' '
+       git reset --hard &&
+       > empty &&
+       git add empty &&
+       git commit -m empty &&
+       rm empty &&
+       echo y | git add -p empty &&
+       git diff --cached >diff &&
+       test_cmp expected diff
+'
+
 test_done