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Merge branch 'jk/no-diff-emit-common'

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"git merge-tree" used to mishandle "both sides added" conflict with
its own "create a fake ancestor file that has the common parts of
what both sides have added and do a 3-way merge" logic; this has
been updated to use the usual "3-way merge with an empty blob as
the fake common ancestor file" approach used in the rest of the
system.

* jk/no-diff-emit-common:
  xdiff: drop XDL_EMIT_COMMON
  merge-tree: drop generate_common strategy
  merge-one-file: use empty blob for add/add base
This commit is contained in:
Junio C Hamano 2016-02-26 13:37:14 -08:00
commit 18b26b18c5
4 changed files with 3 additions and 57 deletions
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3
git-merge-one-file.sh
View File

@ -120,8 +120,7 @@ case "${1:-.}${2:-.}${3:-.}" in
case "$1" in
'')
echo "Added $4 in both, but differently."
orig=$(git-unpack-file $2)
create_virtual_base "$orig" "$src2"
orig=$(git-unpack-file e69de29bb2d1d6434b8b29ae775ad8c2e48c5391)
;;
*)
echo "Auto-merging $4"

38
merge-blobs.c
View File

@ -48,40 +48,6 @@ static void *three_way_filemerge(const char *path, mmfile_t *base, mmfile_t *our
return res.ptr;
}
static int common_outf(void *priv_, mmbuffer_t *mb, int nbuf)
{
int i;
mmfile_t *dst = priv_;
for (i = 0; i < nbuf; i++) {
memcpy(dst->ptr + dst->size, mb[i].ptr, mb[i].size);
dst->size += mb[i].size;
}
return 0;
}
static int generate_common_file(mmfile_t *res, mmfile_t *f1, mmfile_t *f2)
{
unsigned long size = f1->size < f2->size ? f1->size : f2->size;
void *ptr = xmalloc(size);
xpparam_t xpp;
xdemitconf_t xecfg;
xdemitcb_t ecb;
memset(&xpp, 0, sizeof(xpp));
xpp.flags = 0;
memset(&xecfg, 0, sizeof(xecfg));
xecfg.ctxlen = 3;
xecfg.flags = XDL_EMIT_COMMON;
ecb.outf = common_outf;
res->ptr = ptr;
res->size = 0;
ecb.priv = res;
return xdi_diff(f1, f2, &xpp, &xecfg, &ecb);
}
void *merge_blobs(const char *path, struct blob *base, struct blob *our, struct blob *their, unsigned long *size)
{
void *res = NULL;
@ -112,8 +78,8 @@ void *merge_blobs(const char *path, struct blob *base, struct blob *our, struct
if (fill_mmfile_blob(&common, base) < 0)
goto out_free_f2_f1;
} else {
if (generate_common_file(&common, &f1, &f2) < 0)
goto out_free_f2_f1;
common.ptr = xstrdup("");
common.size = 0;
}
res = three_way_filemerge(path, &common, &f1, &f2, size);
free_mmfile(&common);

1
xdiff/xdiff.h
View File

@ -42,7 +42,6 @@ extern "C" {
#define XDF_IGNORE_BLANK_LINES (1 << 7)
#define XDL_EMIT_FUNCNAMES (1 << 0)
#define XDL_EMIT_COMMON (1 << 1)
#define XDL_EMIT_FUNCCONTEXT (1 << 2)
#define XDL_MMB_READONLY (1 << 0)

18
xdiff/xemit.c
View File

@ -120,21 +120,6 @@ static long def_ff(const char *rec, long len, char *buf, long sz, void *priv)
return -1;
}
static int xdl_emit_common(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg) {
xdfile_t *xdf = &xe->xdf2;
const char *rchg = xdf->rchg;
long ix;
for (ix = 0; ix < xdf->nrec; ix++) {
if (rchg[ix])
continue;
if (xdl_emit_record(xdf, ix, "", ecb))
return -1;
}
return 0;
}
struct func_line {
long len;
char buf[80];
@ -170,9 +155,6 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
long funclineprev = -1;
struct func_line func_line = { 0 };
if (xecfg->flags & XDL_EMIT_COMMON)
return xdl_emit_common(xe, xscr, ecb, xecfg);
for (xch = xscr; xch; xch = xche->next) {
xche = xdl_get_hunk(&xch, xecfg);
if (!xch)