Merge pull request #3299 from ethomson/xdiff_update Don't add unnecessary trailing newline during file merge
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diff --git a/src/blame_git.c b/src/blame_git.c
index e863efe..f481426 100644
--- a/src/blame_git.c
+++ b/src/blame_git.c
@@ -304,21 +304,16 @@ static void blame_chunk(
}
static int my_emit(
- xdfenv_t *xe,
- xdchange_t *xscr,
- xdemitcb_t *ecb,
- xdemitconf_t const *xecfg)
+ long start_a, long count_a,
+ long start_b, long count_b,
+ void *cb_data)
{
- xdchange_t *xch = xscr;
- GIT_UNUSED(xe);
- GIT_UNUSED(xecfg);
- while (xch) {
- blame_chunk_cb_data *d = ecb->priv;
- blame_chunk(d->blame, d->tlno, d->plno, xch->i2, d->target, d->parent);
- d->plno = xch->i1 + xch->chg1;
- d->tlno = xch->i2 + xch->chg2;
- xch = xch->next;
- }
+ blame_chunk_cb_data *d = (blame_chunk_cb_data *)cb_data;
+
+ blame_chunk(d->blame, d->tlno, d->plno, start_b, d->target, d->parent);
+ d->plno = start_a + count_a;
+ d->tlno = start_b + count_b;
+
return 0;
}
@@ -352,7 +347,7 @@ static int diff_hunks(mmfile_t file_a, mmfile_t file_b, void *cb_data)
xdemitconf_t xecfg = {0};
xdemitcb_t ecb = {0};
- xecfg.emit_func = (void(*)(void))my_emit;
+ xecfg.hunk_func = my_emit;
ecb.priv = cb_data;
trim_common_tail(&file_a, &file_b, 0);
diff --git a/src/xdiff/xdiff.h b/src/xdiff/xdiff.h
index cb8b235..e2f1e89 100644
--- a/src/xdiff/xdiff.h
+++ b/src/xdiff/xdiff.h
@@ -32,14 +32,14 @@ extern "C" {
#define XDF_IGNORE_WHITESPACE (1 << 2)
#define XDF_IGNORE_WHITESPACE_CHANGE (1 << 3)
#define XDF_IGNORE_WHITESPACE_AT_EOL (1 << 4)
+#define XDF_WHITESPACE_FLAGS (XDF_IGNORE_WHITESPACE | XDF_IGNORE_WHITESPACE_CHANGE | XDF_IGNORE_WHITESPACE_AT_EOL)
+
#define XDF_PATIENCE_DIFF (1 << 5)
#define XDF_HISTOGRAM_DIFF (1 << 6)
-#define XDF_WHITESPACE_FLAGS (XDF_IGNORE_WHITESPACE | XDF_IGNORE_WHITESPACE_CHANGE | XDF_IGNORE_WHITESPACE_AT_EOL)
+#define XDF_DIFF_ALGORITHM_MASK (XDF_PATIENCE_DIFF | XDF_HISTOGRAM_DIFF)
+#define XDF_DIFF_ALG(x) ((x) & XDF_DIFF_ALGORITHM_MASK)
-#define XDL_PATCH_NORMAL '-'
-#define XDL_PATCH_REVERSE '+'
-#define XDL_PATCH_MODEMASK ((1 << 8) - 1)
-#define XDL_PATCH_IGNOREBSPACE (1 << 8)
+#define XDF_IGNORE_BLANK_LINES (1 << 7)
#define XDL_EMIT_FUNCNAMES (1 << 0)
#define XDL_EMIT_COMMON (1 << 1)
@@ -88,13 +88,17 @@ typedef struct s_xdemitcb {
typedef long (*find_func_t)(const char *line, long line_len, char *buffer, long buffer_size, void *priv);
+typedef int (*xdl_emit_hunk_consume_func_t)(long start_a, long count_a,
+ long start_b, long count_b,
+ void *cb_data);
+
typedef struct s_xdemitconf {
long ctxlen;
long interhunkctxlen;
unsigned long flags;
find_func_t find_func;
void *find_func_priv;
- void (*emit_func)(void);
+ xdl_emit_hunk_consume_func_t hunk_func;
} xdemitconf_t;
typedef struct s_bdiffparam {
diff --git a/src/xdiff/xdiffi.c b/src/xdiff/xdiffi.c
index 84aa0fc..2358a2d 100644
--- a/src/xdiff/xdiffi.c
+++ b/src/xdiff/xdiffi.c
@@ -328,10 +328,10 @@ int xdl_do_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
xdalgoenv_t xenv;
diffdata_t dd1, dd2;
- if (xpp->flags & XDF_PATIENCE_DIFF)
+ if (XDF_DIFF_ALG(xpp->flags) == XDF_PATIENCE_DIFF)
return xdl_do_patience_diff(mf1, mf2, xpp, xe);
- if (xpp->flags & XDF_HISTOGRAM_DIFF)
+ if (XDF_DIFF_ALG(xpp->flags) == XDF_HISTOGRAM_DIFF)
return xdl_do_histogram_diff(mf1, mf2, xpp, xe);
if (xdl_prepare_env(mf1, mf2, xpp, xe) < 0) {
@@ -394,6 +394,7 @@ static xdchange_t *xdl_add_change(xdchange_t *xscr, long i1, long i2, long chg1,
xch->i2 = i2;
xch->chg1 = chg1;
xch->chg2 = chg2;
+ xch->ignore = 0;
return xch;
}
@@ -538,13 +539,49 @@ void xdl_free_script(xdchange_t *xscr) {
}
}
+static int xdl_call_hunk_func(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
+ xdemitconf_t const *xecfg)
+{
+ xdchange_t *xch, *xche;
+
+ for (xch = xscr; xch; xch = xche->next) {
+ xche = xdl_get_hunk(&xch, xecfg);
+ if (!xch)
+ break;
+ if (xecfg->hunk_func(xch->i1, xche->i1 + xche->chg1 - xch->i1,
+ xch->i2, xche->i2 + xche->chg2 - xch->i2,
+ ecb->priv) < 0)
+ return -1;
+ }
+ return 0;
+}
+
+static void xdl_mark_ignorable(xdchange_t *xscr, xdfenv_t *xe, long flags)
+{
+ xdchange_t *xch;
+
+ for (xch = xscr; xch; xch = xch->next) {
+ int ignore = 1;
+ xrecord_t **rec;
+ long i;
+
+ rec = &xe->xdf1.recs[xch->i1];
+ for (i = 0; i < xch->chg1 && ignore; i++)
+ ignore = xdl_blankline(rec[i]->ptr, rec[i]->size, flags);
+
+ rec = &xe->xdf2.recs[xch->i2];
+ for (i = 0; i < xch->chg2 && ignore; i++)
+ ignore = xdl_blankline(rec[i]->ptr, rec[i]->size, flags);
+
+ xch->ignore = ignore;
+ }
+}
int xdl_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
xdemitconf_t const *xecfg, xdemitcb_t *ecb) {
xdchange_t *xscr;
xdfenv_t xe;
- emit_func_t ef = xecfg->emit_func ?
- (emit_func_t)xecfg->emit_func : xdl_emit_diff;
+ emit_func_t ef = xecfg->hunk_func ? xdl_call_hunk_func : xdl_emit_diff;
if (xdl_do_diff(mf1, mf2, xpp, &xe) < 0) {
@@ -558,6 +595,9 @@ int xdl_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
return -1;
}
if (xscr) {
+ if (xpp->flags & XDF_IGNORE_BLANK_LINES)
+ xdl_mark_ignorable(xscr, &xe, xpp->flags);
+
if (ef(&xe, xscr, ecb, xecfg) < 0) {
xdl_free_script(xscr);
diff --git a/src/xdiff/xdiffi.h b/src/xdiff/xdiffi.h
index 7a92ea9..8b81206 100644
--- a/src/xdiff/xdiffi.h
+++ b/src/xdiff/xdiffi.h
@@ -41,6 +41,7 @@ typedef struct s_xdchange {
struct s_xdchange *next;
long i1, i2;
long chg1, chg2;
+ int ignore;
} xdchange_t;
diff --git a/src/xdiff/xemit.c b/src/xdiff/xemit.c
index e3e63d9..750a972 100644
--- a/src/xdiff/xemit.c
+++ b/src/xdiff/xemit.c
@@ -56,16 +56,51 @@ static int xdl_emit_record(xdfile_t *xdf, long ri, char const *pre, xdemitcb_t *
/*
* Starting at the passed change atom, find the latest change atom to be included
* 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 *xch, *xchp;
+xdchange_t *xdl_get_hunk(xdchange_t **xscr, xdemitconf_t const *xecfg)
+{
+ xdchange_t *xch, *xchp, *lxch;
long max_common = 2 * xecfg->ctxlen + xecfg->interhunkctxlen;
+ long max_ignorable = xecfg->ctxlen;
+ unsigned long ignored = 0; /* number of ignored blank lines */
+
+ /* remove ignorable changes that are too far before other changes */
+ for (xchp = *xscr; xchp && xchp->ignore; xchp = xchp->next) {
+ xch = xchp->next;
+
+ if (xch == NULL ||
+ xch->i1 - (xchp->i1 + xchp->chg1) >= max_ignorable)
+ *xscr = xch;
+ }
+
+ if (*xscr == NULL)
+ return NULL;
+
+ lxch = *xscr;
- for (xchp = xscr, xch = xscr->next; xch; xchp = xch, xch = xch->next)
- if (xch->i1 - (xchp->i1 + xchp->chg1) > max_common)
+ for (xchp = *xscr, xch = xchp->next; xch; xchp = xch, xch = xch->next) {
+ long distance = xch->i1 - (xchp->i1 + xchp->chg1);
+ if (distance > max_common)
break;
- return xchp;
+ if (distance < max_ignorable && (!xch->ignore || lxch == xchp)) {
+ lxch = xch;
+ ignored = 0;
+ } else if (distance < max_ignorable && xch->ignore) {
+ ignored += xch->chg2;
+ } else if (lxch != xchp &&
+ xch->i1 + ignored - (lxch->i1 + lxch->chg1) > max_common) {
+ break;
+ } else if (!xch->ignore) {
+ lxch = xch;
+ ignored = 0;
+ } else {
+ ignored += xch->chg2;
+ }
+ }
+
+ return lxch;
}
@@ -144,7 +179,9 @@ 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(&xch, xecfg);
+ if (!xch)
+ break;
s1 = XDL_MAX(xch->i1 - xecfg->ctxlen, 0);
s2 = XDL_MAX(xch->i2 - xecfg->ctxlen, 0);
diff --git a/src/xdiff/xemit.h b/src/xdiff/xemit.h
index c2e2e83..d297107 100644
--- a/src/xdiff/xemit.h
+++ b/src/xdiff/xemit.h
@@ -27,7 +27,7 @@
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(xdchange_t **xscr, xdemitconf_t const *xecfg);
int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg);
diff --git a/src/xdiff/xhistogram.c b/src/xdiff/xhistogram.c
index c848128..500d811 100644
--- a/src/xdiff/xhistogram.c
+++ b/src/xdiff/xhistogram.c
@@ -258,7 +258,7 @@ static int fall_back_to_classic_diff(struct histindex *index,
int line1, int count1, int line2, int count2)
{
xpparam_t xpp;
- xpp.flags = index->xpp->flags & ~XDF_HISTOGRAM_DIFF;
+ xpp.flags = index->xpp->flags & ~XDF_DIFF_ALGORITHM_MASK;
return xdl_fall_back_diff(index->env, &xpp,
line1, count1, line2, count2);
diff --git a/src/xdiff/xmerge.c b/src/xdiff/xmerge.c
index 84e4246..b11e598 100644
--- a/src/xdiff/xmerge.c
+++ b/src/xdiff/xmerge.c
@@ -245,11 +245,11 @@ static int xdl_fill_merge_buffer(xdfenv_t *xe1, const char *name1,
dest ? dest + size : NULL);
/* Postimage from side #1 */
if (m->mode & 1)
- size += xdl_recs_copy(xe1, m->i1, m->chg1, 1,
+ size += xdl_recs_copy(xe1, m->i1, m->chg1, (m->mode & 2),
dest ? dest + size : NULL);
/* Postimage from side #2 */
if (m->mode & 2)
- size += xdl_recs_copy(xe2, m->i2, m->chg2, 1,
+ size += xdl_recs_copy(xe2, m->i2, m->chg2, 0,
dest ? dest + size : NULL);
} else
continue;
diff --git a/src/xdiff/xpatience.c b/src/xdiff/xpatience.c
index fdd7d02..04e1a1a 100644
--- a/src/xdiff/xpatience.c
+++ b/src/xdiff/xpatience.c
@@ -288,7 +288,7 @@ static int fall_back_to_classic_diff(struct hashmap *map,
int line1, int count1, int line2, int count2)
{
xpparam_t xpp;
- xpp.flags = map->xpp->flags & ~XDF_PATIENCE_DIFF;
+ xpp.flags = map->xpp->flags & ~XDF_DIFF_ALGORITHM_MASK;
return xdl_fall_back_diff(map->env, &xpp,
line1, count1, line2, count2);
diff --git a/src/xdiff/xprepare.c b/src/xdiff/xprepare.c
index e419f4f..63a22c6 100644
--- a/src/xdiff/xprepare.c
+++ b/src/xdiff/xprepare.c
@@ -181,7 +181,7 @@ static int xdl_prepare_ctx(unsigned int pass, mmfile_t *mf, long narec, xpparam_
if (!(recs = (xrecord_t **) xdl_malloc(narec * sizeof(xrecord_t *))))
goto abort;
- if (xpp->flags & XDF_HISTOGRAM_DIFF)
+ if (XDF_DIFF_ALG(xpp->flags) == XDF_HISTOGRAM_DIFF)
hbits = hsize = 0;
else {
hbits = xdl_hashbits((unsigned int) narec);
@@ -209,8 +209,8 @@ static int xdl_prepare_ctx(unsigned int pass, mmfile_t *mf, long narec, xpparam_
crec->ha = hav;
recs[nrec++] = crec;
- if (!(xpp->flags & XDF_HISTOGRAM_DIFF) &&
- xdl_classify_record(pass, cf, rhash, hbits, crec) < 0)
+ if ((XDF_DIFF_ALG(xpp->flags) != XDF_HISTOGRAM_DIFF) &&
+ xdl_classify_record(pass, cf, rhash, hbits, crec) < 0)
goto abort;
}
}
@@ -273,16 +273,15 @@ int xdl_prepare_env(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
* (nrecs) will be updated correctly anyway by
* xdl_prepare_ctx().
*/
- sample = xpp->flags & XDF_HISTOGRAM_DIFF ? XDL_GUESS_NLINES2 : XDL_GUESS_NLINES1;
+ sample = (XDF_DIFF_ALG(xpp->flags) == XDF_HISTOGRAM_DIFF
+ ? XDL_GUESS_NLINES2 : XDL_GUESS_NLINES1);
enl1 = xdl_guess_lines(mf1, sample) + 1;
enl2 = xdl_guess_lines(mf2, sample) + 1;
- if (!(xpp->flags & XDF_HISTOGRAM_DIFF) &&
- xdl_init_classifier(&cf, enl1 + enl2 + 1, xpp->flags) < 0) {
-
+ if (XDF_DIFF_ALG(xpp->flags) != XDF_HISTOGRAM_DIFF &&
+ xdl_init_classifier(&cf, enl1 + enl2 + 1, xpp->flags) < 0)
return -1;
- }
if (xdl_prepare_ctx(1, mf1, enl1, xpp, &cf, &xe->xdf1) < 0) {
@@ -296,9 +295,9 @@ int xdl_prepare_env(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
return -1;
}
- if (!(xpp->flags & XDF_PATIENCE_DIFF) &&
- !(xpp->flags & XDF_HISTOGRAM_DIFF) &&
- xdl_optimize_ctxs(&cf, &xe->xdf1, &xe->xdf2) < 0) {
+ if ((XDF_DIFF_ALG(xpp->flags) != XDF_PATIENCE_DIFF) &&
+ (XDF_DIFF_ALG(xpp->flags) != XDF_HISTOGRAM_DIFF) &&
+ xdl_optimize_ctxs(&cf, &xe->xdf1, &xe->xdf2) < 0) {
xdl_free_ctx(&xe->xdf2);
xdl_free_ctx(&xe->xdf1);
diff --git a/src/xdiff/xutils.c b/src/xdiff/xutils.c
index bb7bdee..30f2a30 100644
--- a/src/xdiff/xutils.c
+++ b/src/xdiff/xutils.c
@@ -120,35 +120,6 @@ void *xdl_cha_alloc(chastore_t *cha) {
return data;
}
-
-void *xdl_cha_first(chastore_t *cha) {
- chanode_t *sncur;
-
- if (!(cha->sncur = sncur = cha->head))
- return NULL;
-
- cha->scurr = 0;
-
- return (char *) sncur + sizeof(chanode_t) + cha->scurr;
-}
-
-
-void *xdl_cha_next(chastore_t *cha) {
- chanode_t *sncur;
-
- if (!(sncur = cha->sncur))
- return NULL;
- cha->scurr += cha->isize;
- if (cha->scurr == sncur->icurr) {
- if (!(sncur = cha->sncur = sncur->next))
- return NULL;
- cha->scurr = 0;
- }
-
- return (char *) sncur + sizeof(chanode_t) + cha->scurr;
-}
-
-
long xdl_guess_lines(mmfile_t *mf, long sample) {
long nl = 0, size, tsize = 0;
char const *data, *cur, *top;
@@ -170,6 +141,19 @@ long xdl_guess_lines(mmfile_t *mf, long sample) {
return nl + 1;
}
+int xdl_blankline(const char *line, long size, long flags)
+{
+ long i;
+
+ if (!(flags & XDF_WHITESPACE_FLAGS))
+ return (size <= 1);
+
+ for (i = 0; i < size && XDL_ISSPACE(line[i]); i++)
+ ;
+
+ return (i == size);
+}
+
int xdl_recmatch(const char *l1, long s1, const char *l2, long s2, long flags)
{
int i1, i2;
diff --git a/src/xdiff/xutils.h b/src/xdiff/xutils.h
index 714719a..8f952a8 100644
--- a/src/xdiff/xutils.h
+++ b/src/xdiff/xutils.h
@@ -34,6 +34,7 @@ void *xdl_cha_alloc(chastore_t *cha);
void *xdl_cha_first(chastore_t *cha);
void *xdl_cha_next(chastore_t *cha);
long xdl_guess_lines(mmfile_t *mf, long sample);
+int xdl_blankline(const char *line, long size, long flags);
int xdl_recmatch(const char *l1, long s1, const char *l2, long s2, long flags);
unsigned long xdl_hash_record(char const **data, char const *top, long flags);
unsigned int xdl_hashbits(unsigned int size);
diff --git a/tests/merge/files.c b/tests/merge/files.c
index 7f461ab..2fd90d0 100644
--- a/tests/merge/files.c
+++ b/tests/merge/files.c
@@ -249,3 +249,42 @@ void test_merge_files__automerge_whitespace_change(void)
git_merge_file_result_free(&result);
}
+
+void test_merge_files__doesnt_add_newline(void)
+{
+ git_merge_file_input ancestor = GIT_MERGE_FILE_INPUT_INIT,
+ ours = GIT_MERGE_FILE_INPUT_INIT,
+ theirs = GIT_MERGE_FILE_INPUT_INIT;
+ git_merge_file_options opts = GIT_MERGE_FILE_OPTIONS_INIT;
+ git_merge_file_result result = {0};
+ const char *expected = "Zero\n1\n2\n3\n4\n5 XXX\n6 YYY\n7\n8\n9\nTen";
+
+ ancestor.ptr = "0\n1\n2\n3\n4\n5 XXX\n6YYY\n7\n8\n9\n10";
+ ancestor.size = strlen(ancestor.ptr);
+ ancestor.path = "testfile.txt";
+ ancestor.mode = 0100755;
+
+ ours.ptr = "Zero\n1\n2\n3\n4\n5 XXX\n6 YYY\n7\n8\n9\n10";
+ ours.size = strlen(ours.ptr);
+ ours.path = "testfile.txt";
+ ours.mode = 0100755;
+
+ theirs.ptr = "0\n1\n2\n3\n4\n5 XXX\n6 YYY\n7\n8\n9\nTen";
+ theirs.size = strlen(theirs.ptr);
+ theirs.path = "testfile.txt";
+ theirs.mode = 0100755;
+
+ opts.flags |= GIT_MERGE_FILE_IGNORE_WHITESPACE_CHANGE;
+ cl_git_pass(git_merge_file(&result, &ancestor, &ours, &theirs, &opts));
+
+ cl_assert_equal_i(1, result.automergeable);
+
+ cl_assert_equal_s("testfile.txt", result.path);
+ cl_assert_equal_i(0100755, result.mode);
+
+ cl_assert_equal_i(strlen(expected), result.len);
+ cl_assert_equal_strn(expected, result.ptr, result.len);
+
+ git_merge_file_result_free(&result);
+}
+
diff --git a/tests/revert/workdir.c b/tests/revert/workdir.c
index 7ccf0f9..9f83bd8 100644
--- a/tests/revert/workdir.c
+++ b/tests/revert/workdir.c
@@ -334,16 +334,18 @@ void test_revert_workdir__again_after_edit_two(void)
cl_assert(merge_test_index(repo_index, merge_index_entries, 3));
cl_git_pass(git_futils_readbuffer(&diff_buf, "revert/file.txt"));
- cl_assert(strcmp(diff_buf.ptr, "a\n" \
- "<<<<<<< HEAD\n" \
- "=======\n" \
- "a\n" \
- ">>>>>>> parent of 97e52d5... Revert me\n" \
- "a\n" \
- "a\n" \
- "a\n" \
- "a\n" \
- "ab\n") == 0);
+ cl_assert_equal_s(
+ "a\n" \
+ "<<<<<<< HEAD\n" \
+ "=======\n" \
+ "a\n" \
+ ">>>>>>> parent of 97e52d5... Revert me\n" \
+ "a\n" \
+ "a\n" \
+ "a\n" \
+ "a\n" \
+ "ab",
+ diff_buf.ptr);
git_commit_free(revert_commit);
git_commit_free(head_commit);