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xdiff: print post-image for common records instead of pre-image 

Normally it doesn't matter if we show the pre-image or th post-image
for the common parts of a diff because they are the same.  If
white-space changes are ignored they can differ, though.  The
new text after applying the diff is more interesting in that case,
so show that instead of the old contents.

Note: GNU diff shows the pre-image.

Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
René Scharfe 2012-01-06 18:13:00 +01:00 committed by Junio C Hamano
parent 7ed863a85a
commit baf5aaa333
2 changed files with 13 additions and 13 deletions
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14
t/t4015-diff-whitespace.sh
View File

@ -103,7 +103,7 @@ test_expect_success 'another test, with -w --ignore-space-at-eol' 'test_cmp expe
git diff -w -b --ignore-space-at-eol > out
test_expect_success 'another test, with -w -b --ignore-space-at-eol' 'test_cmp expect out'
tr 'Q' '\015' << EOF > expect
tr 'Q_' '\015 ' << EOF > expect
diff --git a/x b/x
index d99af23..8b32fb5 100644
--- a/x
@ -111,19 +111,19 @@ index d99af23..8b32fb5 100644
@@ -1,6 +1,6 @@
-whitespace at beginning
+ whitespace at beginning
whitespace change
whitespace change
-whitespace in the middle
+white space in the middle
whitespace at end
whitespace at end__
unchanged line
CR at endQ
CR at end
EOF
git diff -b > out
test_expect_success 'another test, with -b' 'test_cmp expect out'
git diff -b --ignore-space-at-eol > out
test_expect_success 'another test, with -b --ignore-space-at-eol' 'test_cmp expect out'
tr 'Q' '\015' << EOF > expect
tr 'Q_' '\015 ' << EOF > expect
diff --git a/x b/x
index d99af23..8b32fb5 100644
--- a/x
@ -135,9 +135,9 @@ index d99af23..8b32fb5 100644
+ whitespace at beginning
+whitespace change
+white space in the middle
whitespace at end
whitespace at end__
unchanged line
CR at endQ
CR at end
EOF
git diff --ignore-space-at-eol > out
test_expect_success 'another test, with --ignore-space-at-eol' 'test_cmp expect out'

12
xdiff/xemit.c
View File

@ -87,7 +87,7 @@ static long def_ff(const char *rec, long len, char *buf, long sz, void *priv)
static int xdl_emit_common(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg) {
xdfile_t *xdf = &xe->xdf1;
xdfile_t *xdf = &xe->xdf2;
const char *rchg = xdf->rchg;
long ix;
@ -151,8 +151,8 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
/*
* Emit pre-context.
*/
for (; s1 < xch->i1; s1++)
if (xdl_emit_record(&xe->xdf1, s1, " ", ecb) < 0)
for (; s2 < xch->i2; s2++)
if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
return -1;
for (s1 = xch->i1, s2 = xch->i2;; xch = xch->next) {
@ -160,7 +160,7 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
* Merge previous with current change atom.
*/
for (; s1 < xch->i1 && s2 < xch->i2; s1++, s2++)
if (xdl_emit_record(&xe->xdf1, s1, " ", ecb) < 0)
if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
return -1;
/*
@ -186,8 +186,8 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
/*
* Emit post-context.
*/
for (s1 = xche->i1 + xche->chg1; s1 < e1; s1++)
if (xdl_emit_record(&xe->xdf1, s1, " ", ecb) < 0)
for (s2 = xche->i2 + xche->chg2; s2 < e2; s2++)
if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
return -1;
}