If lines are added at the end of a file, diff -W shows the whole file.
That's because get_func_line() only considers the pre-image and gives up
if it sees a record index beyond its end.
Consider the post-image as well to see if the added lines already make
up a full function. If it doesn't then search for the previous function
line by starting from the bottom of the pre-image, thereby avoiding to
confuse get_func_line().
Reuse the existing label called "again", as it's exactly where we need
to jump to when we're done handling the pre-context, but rename it to
"post_context_calculation" in order to document its new purpose better.
Reported-by: Junio C Hamano <gitster@xxxxxxxxx>
Initial-patch-by: Junio C Hamano <gitster@xxxxxxxxx>
Signed-off-by: Rene Scharfe <l.s.r@xxxxxx>
---
xdiff/xemit.c | 27 ++++++++++++++++++++++++---
1 file changed, 24 insertions(+), 3 deletions(-)
diff --git a/xdiff/xemit.c b/xdiff/xemit.c
index 0c87637..969100d 100644
--- a/xdiff/xemit.c
+++ b/xdiff/xemit.c
@@ -171,7 +171,28 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
s2 = XDL_MAX(xch->i2 - xecfg->ctxlen, 0);
if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) {
- long fs1 = get_func_line(xe, xecfg, NULL, xch->i1, -1);
+ long fs1, i1 = xch->i1;
+
+ /* Appended chunk? */
+ if (i1 >= xe->xdf1.nrec) {
+ char dummy[1];
+
+ /*
+ * We don't need additional context if
+ * a whole function was added.
+ */
+ if (match_func_rec(&xe->xdf2, xecfg, xch->i2,
+ dummy, sizeof(dummy)) >= 0)
+ goto post_context_calculation;
+
+ /*
+ * Otherwise get more context from the
+ * pre-image.
+ */
+ i1 = xe->xdf1.nrec - 1;
+ }
+
+ fs1 = get_func_line(xe, xecfg, NULL, i1, -1);
if (fs1 < 0)
fs1 = 0;
if (fs1 < s1) {
@@ -180,7 +201,7 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
}
}
- again:
+ post_context_calculation:
lctx = xecfg->ctxlen;
lctx = XDL_MIN(lctx, xe->xdf1.nrec - (xche->i1 + xche->chg1));
lctx = XDL_MIN(lctx, xe->xdf2.nrec - (xche->i2 + xche->chg2));
@@ -209,7 +230,7 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
if (l <= e1 ||
get_func_line(xe, xecfg, NULL, l, e1) < 0) {
xche = xche->next;
- goto again;
+ goto post_context_calculation;
}
}
}
--
2.8.3
--
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