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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>
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1 parent 7ed863a commit baf5aaa33383af656a34b7ba9039e9eb3c9e678c René Scharfe committed with gitster Jan 6, 2012
Showing with 13 additions and 13 deletions.
  1. +7 −7 t/t4015-diff-whitespace.sh
  2. +6 −6 xdiff/xemit.c
View
@@ -103,27 +103,27 @@ 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
+++ b/x
@@ -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'
View
@@ -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;
@@ -151,16 +151,16 @@ 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) {
/*
* 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;
}

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