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authorLibravatar Junio C Hamano <gitster@pobox.com>2009-09-03 14:08:20 -0700
committerLibravatar Junio C Hamano <gitster@pobox.com>2009-09-04 11:44:40 -0700
commitefa574438fca4ed328d2e47ecdb6363c50a905ec (patch)
tree7efe135148b2f53cae47004cc578910b83a3c16f
parentapply --whitespace=fix: fix handling of blank lines at the eof (diff)
downloadtgif-efa574438fca4ed328d2e47ecdb6363c50a905ec.tar.xz
apply --whitespace=fix: detect new blank lines at eof correctly
The command tries to strip blank lines at the end of the file added by a patch. It is done by first detecting if a hunk in patch has additional blank lines at the end of itself, and if so checking if such a hunk applies at the end of file. This patch addresses a bug in the logic to implement the former (the previous one addressed a bug in the latter). If the original ends with blank lines, often the patch hunk ends like this: @@ -l,5 +m,7 @@$ _context$ _context$ -deleted$ +$ +$ +$ _$ _$ where _ stands for SP and $ shows a end-of-line. This example patch adds three trailing blank lines, but the code fails to notice it, because it only pays attention to added blank lines at the very end of the hunk. In this example, the three added blank lines do not appear textually at the end in the patch, even though you can see that they are indeed added at the end, if you rearrange the diff like this: @@ -l,5 +m,7 @@$ _context$ _context$ -deleted$ _$ _$ +$ +$ +$ The fix is not to reset the number of (candidate) added blank lines at the end when the loop sees a context line that is empty. Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--builtin-apply.c6
-rwxr-xr-xt/t4124-apply-ws-rule.sh24
2 files changed, 30 insertions, 0 deletions
diff --git a/builtin-apply.c b/builtin-apply.c
index 5b5bde4f39..c5e4048c61 100644
--- a/builtin-apply.c
+++ b/builtin-apply.c
@@ -1913,6 +1913,7 @@ static int apply_one_fragment(struct image *img, struct fragment *frag,
int len = linelen(patch, size);
int plen, added;
int added_blank_line = 0;
+ int is_blank_context = 0;
if (!len)
break;
@@ -1945,8 +1946,11 @@ static int apply_one_fragment(struct image *img, struct fragment *frag,
*new++ = '\n';
add_line_info(&preimage, "\n", 1, LINE_COMMON);
add_line_info(&postimage, "\n", 1, LINE_COMMON);
+ is_blank_context = 1;
break;
case ' ':
+ if (plen && patch[1] == '\n')
+ is_blank_context = 1;
case '-':
memcpy(old, patch + 1, plen);
add_line_info(&preimage, old, plen,
@@ -1986,6 +1990,8 @@ static int apply_one_fragment(struct image *img, struct fragment *frag,
}
if (added_blank_line)
new_blank_lines_at_end++;
+ else if (is_blank_context)
+ ;
else
new_blank_lines_at_end = 0;
patch += len;
diff --git a/t/t4124-apply-ws-rule.sh b/t/t4124-apply-ws-rule.sh
index 6898722f2e..fedc8b9277 100755
--- a/t/t4124-apply-ws-rule.sh
+++ b/t/t4124-apply-ws-rule.sh
@@ -177,4 +177,28 @@ test_expect_success 'blank at EOF with --whitespace=fix (2)' '
test_cmp expect one
'
+test_expect_success 'blank at EOF with --whitespace=fix (3)' '
+ { echo a; echo b; echo; } >one &&
+ git add one &&
+ { echo a; echo c; echo; } >expect &&
+ { cat expect; echo; echo; } >one &&
+ git diff -- one >patch &&
+
+ git checkout one &&
+ git apply --whitespace=fix patch &&
+ test_cmp expect one
+'
+
+test_expect_success 'blank at end of hunk, not at EOF with --whitespace=fix' '
+ { echo a; echo b; echo; echo; echo; echo; echo; echo d; } >one &&
+ git add one &&
+ { echo a; echo c; echo; echo; echo; echo; echo; echo; echo d; } >expect &&
+ cp expect one &&
+ git diff -- one >patch &&
+
+ git checkout one &&
+ git apply --whitespace=fix patch &&
+ test_cmp expect one
+'
+
test_done