From: "Bhushan G. Lodha & David A. Dalrymple" <dad-...@mit.edu>
For filtering by function names, it's useful to split hunks whenever a
function line is encountered, so that each function name being deleted
or inserted gets its own hunk header (which then can be easily detected
by the filter).
This adds a flag, XDL_EMIT_MOREHUNKHEADS, which triggers this
nonstandard behavior, and enables it only in case the --function-name
option is being used.
Signed-off-by: David Dalrymple (on zayin) <davi...@alum.mit.edu>
---
diff.c | 3 ++-
diffcore-pickaxe.c | 3 ++-
xdiff/xdiff.h | 1 +
xdiff/xdiffi.c | 2 +-
xdiff/xemit.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
xdiff/xemit.h | 4 +++-
6 files changed, 67 insertions(+), 6 deletions(-)
diff --git a/diff.c b/diff.c
index 914b4a2..a86206c 100644
--- a/diff.c
+++ b/diff.c
@@ -2381,7 +2381,8 @@ static void builtin_diff(const char *name_a,
xecfg.interhunkctxlen = o->interhunkcontext;
xecfg.flags = XDL_EMIT_FUNCNAMES;
if (o->funcname)
- xecfg.flags |= XDL_EMIT_MOREFUNCNAMES;
+ xecfg.flags |= XDL_EMIT_MOREFUNCNAMES
+ | XDL_EMIT_MOREHUNKHEADS;
if (DIFF_OPT_TST(o, FUNCCONTEXT))
xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
if (pe)
diff --git a/diffcore-pickaxe.c b/diffcore-pickaxe.c
index ab31c18..d9f4c30 100644
--- a/diffcore-pickaxe.c
+++ b/diffcore-pickaxe.c
@@ -164,7 +164,8 @@ static int diff_funcname_filter(mmfile_t *one, mmfile_t
*two,
xecfg.interhunkctxlen = o->interhunkcontext;
if (!(one && two))
xecfg.flags = XDL_EMIT_FUNCCONTEXT;
- xecfg.flags |= XDL_EMIT_FUNCNAMES | XDL_EMIT_MOREFUNCNAMES;
+ xecfg.flags |= XDL_EMIT_FUNCNAMES | XDL_EMIT_MOREFUNCNAMES
+ | XDL_EMIT_MOREHUNKHEADS;
xdi_diff_outf(one, two, match_funcname, &ecbdata, &xpp, &xecfg);
return ecbdata.hit;
}
diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h
index 469bded..787c376 100644
--- a/xdiff/xdiff.h
+++ b/xdiff/xdiff.h
@@ -45,6 +45,7 @@
#define XDL_EMIT_COMMON (1 << 1)
#define XDL_EMIT_FUNCCONTEXT (1 << 2)
#define XDL_EMIT_MOREFUNCNAMES (1 << 3)
+#define XDL_EMIT_MOREHUNKHEADS (1 << 4)
#define XDL_MMB_READONLY (1 << 0)
diff --git a/xdiff/xdiffi.c b/xdiff/xdiffi.c
index 2358a2d..c29804e 100644
--- a/xdiff/xdiffi.c
+++ b/xdiff/xdiffi.c
@@ -545,7 +545,7 @@ static int xdl_call_hunk_func(xdfenv_t *xe, xdchange_t
*xscr, xdemitcb_t *ecb,
xdchange_t *xch, *xche;
for (xch = xscr; xch; xch = xche->next) {
- xche = xdl_get_hunk(&xch, xecfg);
+ xche = xdl_get_hunk(xe, &xch, xecfg);
if (!xch)
break;
if (xecfg->hunk_func(xch->i1, xche->i1 + xche->chg1 - xch->i1,
diff --git a/xdiff/xemit.c b/xdiff/xemit.c
index 0ddb094..f49eaaf 100644
--- a/xdiff/xemit.c
+++ b/xdiff/xemit.c
@@ -29,6 +29,9 @@ struct func_line {
};
+static long get_func_line(xdfile_t *xdf, xdemitconf_t const *xecfg,
+ struct func_line *func_line, long start, long limit);
+
static long xdl_get_rec(xdfile_t *xdf, long ri, char const **rec);
static int xdl_emit_record(xdfile_t *xdf, long ri, char const *pre, xdemitcb_t
*ecb);
@@ -62,7 +65,7 @@ static int xdl_emit_record(xdfile_t *xdf, long ri, char const
*pre, xdemitcb_t *
* inside the differential hunk according to the specified configuration.
* Also advance xscr if the first changes must be discarded.
*/
-xdchange_t *xdl_get_hunk(xdchange_t **xscr, xdemitconf_t const *xecfg)
+xdchange_t *xdl_get_hunk(xdfenv_t *xe, xdchange_t **xscr, xdemitconf_t const
*xecfg)
{
xdchange_t *xch, *xchp, *lxch;
long max_common = 2 * xecfg->ctxlen + xecfg->interhunkctxlen;
@@ -83,6 +86,59 @@ xdchange_t *xdl_get_hunk(xdchange_t **xscr, xdemitconf_t
const *xecfg)
lxch = *xscr;
+ if (xecfg->flags & XDL_EMIT_MOREHUNKHEADS)
+ for (xch = *xscr; xch; xch=xch->next) {
+ /*
+ * If a current change contains a func_line, end this
+ * hunk immediately before and create a new hunk
+ * starting from that line.
+ */
+ long fl_in_xch1 = get_func_line(&xe->xdf1, xecfg, NULL,
+ xch->i1, xch->i1+xch->chg1);
+ long fl_in_xch2 = get_func_line(&xe->xdf2, xecfg, NULL,
+ xch->i2, xch->i2+xch->chg2);
+ if (fl_in_xch1 >= xch->i1 && fl_in_xch2 >= xch->i2) {
+ xdchange_t *new_next =
+ (xdchange_t
*)xdl_malloc(sizeof(xdchange_t));
+ new_next->i1 = xch->i1+xch->chg1;
+ new_next->chg1 = 0;
+ new_next->i2 = xch->i2;
+ new_next->chg2 = xch->chg2;
+ new_next->ignore = xch->ignore;
+ new_next->next = xch->next;
+ xch->next = new_next;
+ xch->chg2 = 0;
+ return xch;
+ }
+ if (fl_in_xch1 > xch->i1) {
+ xdchange_t *new_next =
+ (xdchange_t
*)xdl_malloc(sizeof(xdchange_t));
+ new_next->i1 = fl_in_xch1;
+ new_next->chg1 = (xch->i1+xch->chg1)-fl_in_xch1;
+ new_next->i2 = xch->i2;
+ new_next->chg2 = xch->chg2;
+ new_next->ignore = xch->ignore;
+ new_next->next = xch->next;
+ xch->next = new_next;
+ xch->chg1 = fl_in_xch1 - xch->i1;
+ xch->chg2 = 0;
+ return xch;
+ }
+ if (fl_in_xch2 > xch->i2) {
+ xdchange_t *new_next =
+ (xdchange_t
*)xdl_malloc(sizeof(xdchange_t));
+ new_next->i2 = fl_in_xch2;
+ new_next->chg2 = (xch->i2+xch->chg2)-fl_in_xch2;
+ new_next->i1 = xch->i1+xch->chg1;
+ new_next->chg1 = 0;
+ new_next->ignore = xch->ignore;
+ new_next->next = xch->next;
+ xch->next = new_next;
+ xch->chg2 = fl_in_xch2 - xch->i2;
+ return xch;
+ }
+ }
+
for (xchp = *xscr, xch = xchp->next; xch; xchp = xch, xch = xch->next) {
long distance = xch->i1 - (xchp->i1 + xchp->chg1);
if (distance > max_common)
@@ -173,7 +229,7 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr,
xdemitcb_t *ecb,
return xdl_emit_common(xe, xscr, ecb, xecfg);
for (xch = xscr; xch; xch = xche->next) {
- xche = xdl_get_hunk(&xch, xecfg);
+ xche = xdl_get_hunk(xe, &xch, xecfg);
if (!xch)
break;
diff --git a/xdiff/xemit.h b/xdiff/xemit.h
index d297107..4d584f5 100644
--- a/xdiff/xemit.h
+++ b/xdiff/xemit.h
@@ -27,7 +27,9 @@
typedef int (*emit_func_t)(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg);
-xdchange_t *xdl_get_hunk(xdchange_t **xscr, xdemitconf_t const *xecfg);
+xdchange_t *xdl_get_hunk(xdfenv_t *xe, xdchange_t **xscr,
+ xdemitconf_t const *xecfg);
+
int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg);
--
1.7.12.4 (Apple Git-37)
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