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-rw-r--r--xdiff/xdiff.h1
-rw-r--r--xdiff/xemit.c85
2 files changed, 70 insertions, 16 deletions
diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h
index 4beb10c678..00d36c3ac7 100644
--- a/xdiff/xdiff.h
+++ b/xdiff/xdiff.h
@@ -43,6 +43,7 @@ extern "C" {
#define XDL_EMIT_FUNCNAMES (1 << 0)
#define XDL_EMIT_COMMON (1 << 1)
+#define XDL_EMIT_FUNCCONTEXT (1 << 2)
#define XDL_MMB_READONLY (1 << 0)
diff --git a/xdiff/xemit.c b/xdiff/xemit.c
index 277e2eec5b..2e669c3e25 100644
--- a/xdiff/xemit.c
+++ b/xdiff/xemit.c
@@ -100,14 +100,40 @@ static int xdl_emit_common(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
return 0;
}
+struct func_line {
+ long len;
+ char buf[80];
+};
+
+static long get_func_line(xdfenv_t *xe, xdemitconf_t const *xecfg,
+ struct func_line *func_line, long start, long limit)
+{
+ find_func_t ff = xecfg->find_func ? xecfg->find_func : def_ff;
+ long l, size, step = (start > limit) ? -1 : 1;
+ char *buf, dummy[1];
+
+ buf = func_line ? func_line->buf : dummy;
+ size = func_line ? sizeof(func_line->buf) : sizeof(dummy);
+
+ for (l = start; l != limit && 0 <= l && l < xe->xdf1.nrec; l += step) {
+ const char *rec;
+ long reclen = xdl_get_rec(&xe->xdf1, l, &rec);
+ long len = ff(rec, reclen, buf, size, xecfg->find_func_priv);
+ if (len >= 0) {
+ if (func_line)
+ func_line->len = len;
+ return l;
+ }
+ }
+ return -1;
+}
+
int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg) {
long s1, s2, e1, e2, lctx;
xdchange_t *xch, *xche;
- char funcbuf[80];
- long funclen = 0;
long funclineprev = -1;
- find_func_t ff = xecfg->find_func ? xecfg->find_func : def_ff;
+ struct func_line func_line = { 0 };
if (xecfg->flags & XDL_EMIT_COMMON)
return xdl_emit_common(xe, xscr, ecb, xecfg);
@@ -118,6 +144,17 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
s1 = XDL_MAX(xch->i1 - xecfg->ctxlen, 0);
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);
+ if (fs1 < 0)
+ fs1 = 0;
+ if (fs1 < s1) {
+ s2 -= s1 - fs1;
+ s1 = fs1;
+ }
+ }
+
+ again:
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));
@@ -125,27 +162,43 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
e1 = xche->i1 + xche->chg1 + lctx;
e2 = xche->i2 + xche->chg2 + lctx;
+ if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) {
+ long fe1 = get_func_line(xe, xecfg, NULL,
+ xche->i1 + xche->chg1,
+ xe->xdf1.nrec);
+ if (fe1 < 0)
+ fe1 = xe->xdf1.nrec;
+ if (fe1 > e1) {
+ e2 += fe1 - e1;
+ e1 = fe1;
+ }
+
+ /*
+ * Overlap with next change? Then include it
+ * in the current hunk and start over to find
+ * its new end.
+ */
+ if (xche->next) {
+ long l = xche->next->i1;
+ if (l <= e1 ||
+ get_func_line(xe, xecfg, NULL, l, e1) < 0) {
+ xche = xche->next;
+ goto again;
+ }
+ }
+ }
+
/*
* Emit current hunk header.
*/
if (xecfg->flags & XDL_EMIT_FUNCNAMES) {
- long l;
- for (l = s1 - 1; l >= 0 && l > funclineprev; l--) {
- const char *rec;
- long reclen = xdl_get_rec(&xe->xdf1, l, &rec);
- long newfunclen = ff(rec, reclen, funcbuf,
- sizeof(funcbuf),
- xecfg->find_func_priv);
- if (newfunclen >= 0) {
- funclen = newfunclen;
- break;
- }
- }
+ get_func_line(xe, xecfg, &func_line,
+ s1 - 1, funclineprev);
funclineprev = s1 - 1;
}
if (xdl_emit_hunk_hdr(s1 + 1, e1 - s1, s2 + 1, e2 - s2,
- funcbuf, funclen, ecb) < 0)
+ func_line.buf, func_line.len, ecb) < 0)
return -1;
/*