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git-commit-vandalism/combine-diff.c
Thomas Rast 0721c314a5 Use die_errno() instead of die() when checking syscalls 
Lots of die() calls did not actually report the kind of error, which
can leave the user confused as to the real problem.  Use die_errno()
where we check a system/library call that sets errno on failure, or
one of the following that wrap such calls:

  Function              Passes on error from
  --------              --------------------
  odb_pack_keep         open
  read_ancestry         fopen
  read_in_full          xread
  strbuf_read           xread
  strbuf_read_file      open or strbuf_read_file
  strbuf_readlink       readlink
  write_in_full         xwrite

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-06-27 11:14:53 -07:00

1070 lines
28 KiB
C
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#include "cache.h"
#include "commit.h"
#include "blob.h"
#include "diff.h"
#include "diffcore.h"
#include "quote.h"
#include "xdiff-interface.h"
#include "log-tree.h"
#include "refs.h"
static struct combine_diff_path *intersect_paths(struct combine_diff_path *curr, int n, int num_parent)
{
struct diff_queue_struct *q = &diff_queued_diff;
struct combine_diff_path *p;
int i;
if (!n) {
struct combine_diff_path *list = NULL, **tail = &list;
for (i = 0; i < q->nr; i++) {
int len;
const char *path;
if (diff_unmodified_pair(q->queue[i]))
continue;
path = q->queue[i]->two->path;
len = strlen(path);
p = xmalloc(combine_diff_path_size(num_parent, len));
p->path = (char *) &(p->parent[num_parent]);
memcpy(p->path, path, len);
p->path[len] = 0;
p->len = len;
p->next = NULL;
memset(p->parent, 0,
sizeof(p->parent[0]) * num_parent);
hashcpy(p->sha1, q->queue[i]->two->sha1);
p->mode = q->queue[i]->two->mode;
hashcpy(p->parent[n].sha1, q->queue[i]->one->sha1);
p->parent[n].mode = q->queue[i]->one->mode;
p->parent[n].status = q->queue[i]->status;
*tail = p;
tail = &p->next;
}
return list;
}
for (p = curr; p; p = p->next) {
int found = 0;
if (!p->len)
continue;
for (i = 0; i < q->nr; i++) {
const char *path;
int len;
if (diff_unmodified_pair(q->queue[i]))
continue;
path = q->queue[i]->two->path;
len = strlen(path);
if (len == p->len && !memcmp(path, p->path, len)) {
found = 1;
hashcpy(p->parent[n].sha1, q->queue[i]->one->sha1);
p->parent[n].mode = q->queue[i]->one->mode;
p->parent[n].status = q->queue[i]->status;
break;
}
}
if (!found)
p->len = 0;
}
return curr;
}
/* Lines lost from parent */
struct lline {
struct lline *next;
int len;
unsigned long parent_map;
char line[FLEX_ARRAY];
};
/* Lines surviving in the merge result */
struct sline {
struct lline *lost_head, **lost_tail;
char *bol;
int len;
/* bit 0 up to (N-1) are on if the parent has this line (i.e.
* we did not change it).
* bit N is used for "interesting" lines, including context.
* bit (N+1) is used for "do not show deletion before this".
*/
unsigned long flag;
unsigned long *p_lno;
};
static char *grab_blob(const unsigned char *sha1, unsigned int mode, unsigned long *size)
{
char *blob;
enum object_type type;
if (S_ISGITLINK(mode)) {
blob = xmalloc(100);
*size = snprintf(blob, 100,
"Subproject commit %s\n", sha1_to_hex(sha1));
} else if (is_null_sha1(sha1)) {
/* deleted blob */
*size = 0;
return xcalloc(1, 1);
} else {
blob = read_sha1_file(sha1, &type, size);
if (type != OBJ_BLOB)
die("object '%s' is not a blob!", sha1_to_hex(sha1));
}
return blob;
}
static void append_lost(struct sline *sline, int n, const char *line, int len)
{
struct lline *lline;
unsigned long this_mask = (1UL<<n);
if (line[len-1] == '\n')
len--;
/* Check to see if we can squash things */
if (sline->lost_head) {
struct lline *last_one = NULL;
/* We cannot squash it with earlier one */
for (lline = sline->lost_head;
lline;
lline = lline->next)
if (lline->parent_map & this_mask)
last_one = lline;
lline = last_one ? last_one->next : sline->lost_head;
while (lline) {
if (lline->len == len &&
!memcmp(lline->line, line, len)) {
lline->parent_map |= this_mask;
return;
}
lline = lline->next;
}
}
lline = xmalloc(sizeof(*lline) + len + 1);
lline->len = len;
lline->next = NULL;
lline->parent_map = this_mask;
memcpy(lline->line, line, len);
lline->line[len] = 0;
*sline->lost_tail = lline;
sline->lost_tail = &lline->next;
}
struct combine_diff_state {
unsigned int lno;
int ob, on, nb, nn;
unsigned long nmask;
int num_parent;
int n;
struct sline *sline;
struct sline *lost_bucket;
};
static void consume_line(void *state_, char *line, unsigned long len)
{
struct combine_diff_state *state = state_;
if (5 < len && !memcmp("@@ -", line, 4)) {
if (parse_hunk_header(line, len,
&state->ob, &state->on,
&state->nb, &state->nn))
return;
state->lno = state->nb;
if (!state->nb)
/* @@ -1,2 +0,0 @@ to remove the
* first two lines...
*/
state->nb = 1;
if (state->nn == 0)
/* @@ -X,Y +N,0 @@ removed Y lines
* that would have come *after* line N
* in the result. Our lost buckets hang
* to the line after the removed lines,
*/
state->lost_bucket = &state->sline[state->nb];
else
state->lost_bucket = &state->sline[state->nb-1];
if (!state->sline[state->nb-1].p_lno)
state->sline[state->nb-1].p_lno =
xcalloc(state->num_parent,
sizeof(unsigned long));
state->sline[state->nb-1].p_lno[state->n] = state->ob;
return;
}
if (!state->lost_bucket)
return; /* not in any hunk yet */
switch (line[0]) {
case '-':
append_lost(state->lost_bucket, state->n, line+1, len-1);
break;
case '+':
state->sline[state->lno-1].flag |= state->nmask;
state->lno++;
break;
}
}
static void combine_diff(const unsigned char *parent, unsigned int mode,
mmfile_t *result_file,
struct sline *sline, unsigned int cnt, int n,
int num_parent)
{
unsigned int p_lno, lno;
unsigned long nmask = (1UL << n);
xpparam_t xpp;
xdemitconf_t xecfg;
mmfile_t parent_file;
xdemitcb_t ecb;
struct combine_diff_state state;
unsigned long sz;
if (!cnt)
return; /* result deleted */
parent_file.ptr = grab_blob(parent, mode, &sz);
parent_file.size = sz;
memset(&xpp, 0, sizeof(xpp));
xpp.flags = XDF_NEED_MINIMAL;
memset(&xecfg, 0, sizeof(xecfg));
memset(&state, 0, sizeof(state));
state.nmask = nmask;
state.sline = sline;
state.lno = 1;
state.num_parent = num_parent;
state.n = n;
xdi_diff_outf(&parent_file, result_file, consume_line, &state,
&xpp, &xecfg, &ecb);
free(parent_file.ptr);
/* Assign line numbers for this parent.
*
* sline[lno].p_lno[n] records the first line number
* (counting from 1) for parent N if the final hunk display
* started by showing sline[lno] (possibly showing the lost
* lines attached to it first).
*/
for (lno = 0, p_lno = 1; lno <= cnt; lno++) {
struct lline *ll;
sline[lno].p_lno[n] = p_lno;
/* How many lines would this sline advance the p_lno? */
ll = sline[lno].lost_head;
while (ll) {
if (ll->parent_map & nmask)
p_lno++; /* '-' means parent had it */
ll = ll->next;
}
if (lno < cnt && !(sline[lno].flag & nmask))
p_lno++; /* no '+' means parent had it */
}
sline[lno].p_lno[n] = p_lno; /* trailer */
}
static unsigned long context = 3;
static char combine_marker = '@';
static int interesting(struct sline *sline, unsigned long all_mask)
{
/* If some parents lost lines here, or if we have added to
* some parent, it is interesting.
*/
return ((sline->flag & all_mask) || sline->lost_head);
}
static unsigned long adjust_hunk_tail(struct sline *sline,
unsigned long all_mask,
unsigned long hunk_begin,
unsigned long i)
{
/* i points at the first uninteresting line. If the last line
* of the hunk was interesting only because it has some
* deletion, then it is not all that interesting for the
* purpose of giving trailing context lines. This is because
* we output '-' line and then unmodified sline[i-1] itself in
* that case which gives us one extra context line.
*/
if ((hunk_begin + 1 <= i) && !(sline[i-1].flag & all_mask))
i--;
return i;
}
static unsigned long find_next(struct sline *sline,
unsigned long mark,
unsigned long i,
unsigned long cnt,
int look_for_uninteresting)
{
/* We have examined up to i-1 and are about to look at i.
* Find next interesting or uninteresting line. Here,
* "interesting" does not mean interesting(), but marked by
* the give_context() function below (i.e. it includes context
* lines that are not interesting to interesting() function
* that are surrounded by interesting() ones.
*/
while (i <= cnt)
if (look_for_uninteresting
? !(sline[i].flag & mark)
: (sline[i].flag & mark))
return i;
else
i++;
return i;
}
static int give_context(struct sline *sline, unsigned long cnt, int num_parent)
{
unsigned long all_mask = (1UL<<num_parent) - 1;
unsigned long mark = (1UL<<num_parent);
unsigned long no_pre_delete = (2UL<<num_parent);
unsigned long i;
/* Two groups of interesting lines may have a short gap of
* uninteresting lines. Connect such groups to give them a
* bit of context.
*
* We first start from what the interesting() function says,
* and mark them with "mark", and paint context lines with the
* mark. So interesting() would still say false for such context
* lines but they are treated as "interesting" in the end.
*/
i = find_next(sline, mark, 0, cnt, 0);
if (cnt < i)
return 0;
while (i <= cnt) {
unsigned long j = (context < i) ? (i - context) : 0;
unsigned long k;
/* Paint a few lines before the first interesting line. */
while (j < i)
sline[j++].flag |= mark | no_pre_delete;
again:
/* we know up to i is to be included. where does the
* next uninteresting one start?
*/
j = find_next(sline, mark, i, cnt, 1);
if (cnt < j)
break; /* the rest are all interesting */
/* lookahead context lines */
k = find_next(sline, mark, j, cnt, 0);
j = adjust_hunk_tail(sline, all_mask, i, j);
if (k < j + context) {
/* k is interesting and [j,k) are not, but
* paint them interesting because the gap is small.
*/
while (j < k)
sline[j++].flag |= mark;
i = k;
goto again;
}
/* j is the first uninteresting line and there is
* no overlap beyond it within context lines. Paint
* the trailing edge a bit.
*/
i = k;
k = (j + context < cnt+1) ? j + context : cnt+1;
while (j < k)
sline[j++].flag |= mark;
}
return 1;
}
static int make_hunks(struct sline *sline, unsigned long cnt,
int num_parent, int dense)
{
unsigned long all_mask = (1UL<<num_parent) - 1;
unsigned long mark = (1UL<<num_parent);
unsigned long i;
int has_interesting = 0;
for (i = 0; i <= cnt; i++) {
if (interesting(&sline[i], all_mask))
sline[i].flag |= mark;
else
sline[i].flag &= ~mark;
}
if (!dense)
return give_context(sline, cnt, num_parent);
/* Look at each hunk, and if we have changes from only one
* parent, or the changes are the same from all but one
* parent, mark that uninteresting.
*/
i = 0;
while (i <= cnt) {
unsigned long j, hunk_begin, hunk_end;
unsigned long same_diff;
while (i <= cnt && !(sline[i].flag & mark))
i++;
if (cnt < i)
break; /* No more interesting hunks */
hunk_begin = i;
for (j = i + 1; j <= cnt; j++) {
if (!(sline[j].flag & mark)) {
/* Look beyond the end to see if there
* is an interesting line after this
* hunk within context span.
*/
unsigned long la; /* lookahead */
int contin = 0;
la = adjust_hunk_tail(sline, all_mask,
hunk_begin, j);
la = (la + context < cnt + 1) ?
(la + context) : cnt + 1;
while (j <= --la) {
if (sline[la].flag & mark) {
contin = 1;
break;
}
}
if (!contin)
break;
j = la;
}
}
hunk_end = j;
/* [i..hunk_end) are interesting. Now is it really
* interesting? We check if there are only two versions
* and the result matches one of them. That is, we look
* at:
* (+) line, which records lines added to which parents;
* this line appears in the result.
* (-) line, which records from what parents the line
* was removed; this line does not appear in the result.
* then check the set of parents the result has difference
* from, from all lines. If there are lines that has
* different set of parents that the result has differences
* from, that means we have more than two versions.
*
* Even when we have only two versions, if the result does
* not match any of the parents, the it should be considered
* interesting. In such a case, we would have all '+' line.
* After passing the above "two versions" test, that would
* appear as "the same set of parents" to be "all parents".
*/
same_diff = 0;
has_interesting = 0;
for (j = i; j < hunk_end && !has_interesting; j++) {
unsigned long this_diff = sline[j].flag & all_mask;
struct lline *ll = sline[j].lost_head;
if (this_diff) {
/* This has some changes. Is it the
* same as others?
*/
if (!same_diff)
same_diff = this_diff;
else if (same_diff != this_diff) {
has_interesting = 1;
break;
}
}
while (ll && !has_interesting) {
/* Lost this line from these parents;
* who are they? Are they the same?
*/
this_diff = ll->parent_map;
if (!same_diff)
same_diff = this_diff;
else if (same_diff != this_diff) {
has_interesting = 1;
}
ll = ll->next;
}
}
if (!has_interesting && same_diff != all_mask) {
/* This hunk is not that interesting after all */
for (j = hunk_begin; j < hunk_end; j++)
sline[j].flag &= ~mark;
}
i = hunk_end;
}
has_interesting = give_context(sline, cnt, num_parent);
return has_interesting;
}
static void show_parent_lno(struct sline *sline, unsigned long l0, unsigned long l1, int n, unsigned long null_context)
{
l0 = sline[l0].p_lno[n];
l1 = sline[l1].p_lno[n];
printf(" -%lu,%lu", l0, l1-l0-null_context);
}
static int hunk_comment_line(const char *bol)
{
int ch;
if (!bol)
return 0;
ch = *bol & 0xff;
return (isalpha(ch) || ch == '_' || ch == '$');
}
static void show_line_to_eol(const char *line, int len, const char *reset)
{
int saw_cr_at_eol = 0;
if (len < 0)
len = strlen(line);
saw_cr_at_eol = (len && line[len-1] == '\r');
printf("%.*s%s%s\n", len - saw_cr_at_eol, line,
reset,
saw_cr_at_eol ? "\r" : "");
}
static void dump_sline(struct sline *sline, unsigned long cnt, int num_parent,
int use_color)
{
unsigned long mark = (1UL<<num_parent);
unsigned long no_pre_delete = (2UL<<num_parent);
int i;
unsigned long lno = 0;
const char *c_frag = diff_get_color(use_color, DIFF_FRAGINFO);
const char *c_new = diff_get_color(use_color, DIFF_FILE_NEW);
const char *c_old = diff_get_color(use_color, DIFF_FILE_OLD);
const char *c_plain = diff_get_color(use_color, DIFF_PLAIN);
const char *c_reset = diff_get_color(use_color, DIFF_RESET);
if (!cnt)
return; /* result deleted */
while (1) {
unsigned long hunk_end;
unsigned long rlines;
const char *hunk_comment = NULL;
unsigned long null_context = 0;
while (lno <= cnt && !(sline[lno].flag & mark)) {
if (hunk_comment_line(sline[lno].bol))
hunk_comment = sline[lno].bol;
lno++;
}
if (cnt < lno)
break;
else {
for (hunk_end = lno + 1; hunk_end <= cnt; hunk_end++)
if (!(sline[hunk_end].flag & mark))
break;
}
rlines = hunk_end - lno;
if (cnt < hunk_end)
rlines--; /* pointing at the last delete hunk */
if (!context) {
/*
* Even when running with --unified=0, all
* lines in the hunk needs to be processed in
* the loop below in order to show the
* deletion recorded in lost_head. However,
* we do not want to show the resulting line
* with all blank context markers in such a
* case. Compensate.
*/
unsigned long j;
for (j = lno; j < hunk_end; j++)
if (!(sline[j].flag & (mark-1)))
null_context++;
rlines -= null_context;
}
fputs(c_frag, stdout);
for (i = 0; i <= num_parent; i++) putchar(combine_marker);
for (i = 0; i < num_parent; i++)
show_parent_lno(sline, lno, hunk_end, i, null_context);
printf(" +%lu,%lu ", lno+1, rlines);
for (i = 0; i <= num_parent; i++) putchar(combine_marker);
if (hunk_comment) {
int comment_end = 0;
for (i = 0; i < 40; i++) {
int ch = hunk_comment[i] & 0xff;
if (!ch || ch == '\n')
break;
if (!isspace(ch))
comment_end = i;
}
if (comment_end)
putchar(' ');
for (i = 0; i < comment_end; i++)
putchar(hunk_comment[i]);
}
printf("%s\n", c_reset);
while (lno < hunk_end) {
struct lline *ll;
int j;
unsigned long p_mask;
struct sline *sl = &sline[lno++];
ll = (sl->flag & no_pre_delete) ? NULL : sl->lost_head;
while (ll) {
fputs(c_old, stdout);
for (j = 0; j < num_parent; j++) {
if (ll->parent_map & (1UL<<j))
putchar('-');
else
putchar(' ');
}
show_line_to_eol(ll->line, -1, c_reset);
ll = ll->next;
}
if (cnt < lno)
break;
p_mask = 1;
if (!(sl->flag & (mark-1))) {
/*
* This sline was here to hang the
* lost lines in front of it.
*/
if (!context)
continue;
fputs(c_plain, stdout);
}
else
fputs(c_new, stdout);
for (j = 0; j < num_parent; j++) {
if (p_mask & sl->flag)
putchar('+');
else
putchar(' ');
p_mask <<= 1;
}
show_line_to_eol(sl->bol, sl->len, c_reset);
}
}
}
static void reuse_combine_diff(struct sline *sline, unsigned long cnt,
int i, int j)
{
/* We have already examined parent j and we know parent i
* and parent j are the same, so reuse the combined result
* of parent j for parent i.
*/
unsigned long lno, imask, jmask;
imask = (1UL<<i);
jmask = (1UL<<j);
for (lno = 0; lno <= cnt; lno++) {
struct lline *ll = sline->lost_head;
sline->p_lno[i] = sline->p_lno[j];
while (ll) {
if (ll->parent_map & jmask)
ll->parent_map |= imask;
ll = ll->next;
}
if (sline->flag & jmask)
sline->flag |= imask;
sline++;
}
/* the overall size of the file (sline[cnt]) */
sline->p_lno[i] = sline->p_lno[j];
}
static void dump_quoted_path(const char *head,
const char *prefix,
const char *path,
const char *c_meta, const char *c_reset)
{
static struct strbuf buf = STRBUF_INIT;
strbuf_reset(&buf);
strbuf_addstr(&buf, c_meta);
strbuf_addstr(&buf, head);
quote_two_c_style(&buf, prefix, path, 0);
strbuf_addstr(&buf, c_reset);
puts(buf.buf);
}
static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
int dense, struct rev_info *rev)
{
struct diff_options *opt = &rev->diffopt;
unsigned long result_size, cnt, lno;
char *result, *cp;
struct sline *sline; /* survived lines */
int mode_differs = 0;
int i, show_hunks;
int working_tree_file = is_null_sha1(elem->sha1);
int abbrev = DIFF_OPT_TST(opt, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
const char *a_prefix, *b_prefix;
mmfile_t result_file;
context = opt->context;
a_prefix = opt->a_prefix ? opt->a_prefix : "a/";
b_prefix = opt->b_prefix ? opt->b_prefix : "b/";
/* Read the result of merge first */
if (!working_tree_file)
result = grab_blob(elem->sha1, elem->mode, &result_size);
else {
/* Used by diff-tree to read from the working tree */
struct stat st;
int fd = -1;
if (lstat(elem->path, &st) < 0)
goto deleted_file;
if (S_ISLNK(st.st_mode)) {
struct strbuf buf = STRBUF_INIT;
if (strbuf_readlink(&buf, elem->path, st.st_size) < 0) {
error("readlink(%s): %s", elem->path,
strerror(errno));
return;
}
result_size = buf.len;
result = strbuf_detach(&buf, NULL);
elem->mode = canon_mode(st.st_mode);
} else if (S_ISDIR(st.st_mode)) {
unsigned char sha1[20];
if (resolve_gitlink_ref(elem->path, "HEAD", sha1) < 0)
result = grab_blob(elem->sha1, elem->mode, &result_size);
else
result = grab_blob(sha1, elem->mode, &result_size);
} else if (0 <= (fd = open(elem->path, O_RDONLY))) {
size_t len = xsize_t(st.st_size);
ssize_t done;
int is_file, i;
elem->mode = canon_mode(st.st_mode);
/* if symlinks don't work, assume symlink if all parents
* are symlinks
*/
is_file = has_symlinks;
for (i = 0; !is_file && i < num_parent; i++)
is_file = !S_ISLNK(elem->parent[i].mode);
if (!is_file)
elem->mode = canon_mode(S_IFLNK);
result_size = len;
result = xmalloc(len + 1);
done = read_in_full(fd, result, len);
if (done < 0)
die_errno("read error '%s'", elem->path);
else if (done < len)
die("early EOF '%s'", elem->path);
result[len] = 0;
/* If not a fake symlink, apply filters, e.g. autocrlf */
if (is_file) {
struct strbuf buf = STRBUF_INIT;
if (convert_to_git(elem->path, result, len, &buf, safe_crlf)) {
free(result);
result = strbuf_detach(&buf, &len);
result_size = len;
}
}
}
else {
deleted_file:
result_size = 0;
elem->mode = 0;
result = xcalloc(1, 1);
}
if (0 <= fd)
close(fd);
}
for (cnt = 0, cp = result; cp < result + result_size; cp++) {
if (*cp == '\n')
cnt++;
}
if (result_size && result[result_size-1] != '\n')
cnt++; /* incomplete line */
sline = xcalloc(cnt+2, sizeof(*sline));
sline[0].bol = result;
for (lno = 0; lno <= cnt + 1; lno++) {
sline[lno].lost_tail = &sline[lno].lost_head;
sline[lno].flag = 0;
}
for (lno = 0, cp = result; cp < result + result_size; cp++) {
if (*cp == '\n') {
sline[lno].len = cp - sline[lno].bol;
lno++;
if (lno < cnt)
sline[lno].bol = cp + 1;
}
}
if (result_size && result[result_size-1] != '\n')
sline[cnt-1].len = result_size - (sline[cnt-1].bol - result);
result_file.ptr = result;
result_file.size = result_size;
/* Even p_lno[cnt+1] is valid -- that is for the end line number
* for deletion hunk at the end.
*/
sline[0].p_lno = xcalloc((cnt+2) * num_parent, sizeof(unsigned long));
for (lno = 0; lno <= cnt; lno++)
sline[lno+1].p_lno = sline[lno].p_lno + num_parent;
for (i = 0; i < num_parent; i++) {
int j;
for (j = 0; j < i; j++) {
if (!hashcmp(elem->parent[i].sha1,
elem->parent[j].sha1)) {
reuse_combine_diff(sline, cnt, i, j);
break;
}
}
if (i <= j)
combine_diff(elem->parent[i].sha1,
elem->parent[i].mode,
&result_file, sline,
cnt, i, num_parent);
if (elem->parent[i].mode != elem->mode)
mode_differs = 1;
}
show_hunks = make_hunks(sline, cnt, num_parent, dense);
if (show_hunks || mode_differs || working_tree_file) {
const char *abb;
int use_color = DIFF_OPT_TST(opt, COLOR_DIFF);
const char *c_meta = diff_get_color(use_color, DIFF_METAINFO);
const char *c_reset = diff_get_color(use_color, DIFF_RESET);
int added = 0;
int deleted = 0;
if (rev->loginfo && !rev->no_commit_id)
show_log(rev);
dump_quoted_path(dense ? "diff --cc " : "diff --combined ",
"", elem->path, c_meta, c_reset);
printf("%sindex ", c_meta);
for (i = 0; i < num_parent; i++) {
abb = find_unique_abbrev(elem->parent[i].sha1,
abbrev);
printf("%s%s", i ? "," : "", abb);
}
abb = find_unique_abbrev(elem->sha1, abbrev);
printf("..%s%s\n", abb, c_reset);
if (mode_differs) {
deleted = !elem->mode;
/* We say it was added if nobody had it */
added = !deleted;
for (i = 0; added && i < num_parent; i++)
if (elem->parent[i].status !=
DIFF_STATUS_ADDED)
added = 0;
if (added)
printf("%snew file mode %06o",
c_meta, elem->mode);
else {
if (deleted)
printf("%sdeleted file ", c_meta);
printf("mode ");
for (i = 0; i < num_parent; i++) {
printf("%s%06o", i ? "," : "",
elem->parent[i].mode);
}
if (elem->mode)
printf("..%06o", elem->mode);
}
printf("%s\n", c_reset);
}
if (added)
dump_quoted_path("--- ", "", "/dev/null",
c_meta, c_reset);
else
dump_quoted_path("--- ", a_prefix, elem->path,
c_meta, c_reset);
if (deleted)
dump_quoted_path("+++ ", "", "/dev/null",
c_meta, c_reset);
else
dump_quoted_path("+++ ", b_prefix, elem->path,
c_meta, c_reset);
dump_sline(sline, cnt, num_parent,
DIFF_OPT_TST(opt, COLOR_DIFF));
}
free(result);
for (lno = 0; lno < cnt; lno++) {
if (sline[lno].lost_head) {
struct lline *ll = sline[lno].lost_head;
while (ll) {
struct lline *tmp = ll;
ll = ll->next;
free(tmp);
}
}
}
free(sline[0].p_lno);
free(sline);
}
#define COLONS "::::::::::::::::::::::::::::::::"
static void show_raw_diff(struct combine_diff_path *p, int num_parent, struct rev_info *rev)
{
struct diff_options *opt = &rev->diffopt;
int i, offset;
const char *prefix;
int line_termination, inter_name_termination;
line_termination = opt->line_termination;
inter_name_termination = '\t';
if (!line_termination)
inter_name_termination = 0;
if (rev->loginfo && !rev->no_commit_id)
show_log(rev);
if (opt->output_format & DIFF_FORMAT_RAW) {
offset = strlen(COLONS) - num_parent;
if (offset < 0)
offset = 0;
prefix = COLONS + offset;
/* Show the modes */
for (i = 0; i < num_parent; i++) {
printf("%s%06o", prefix, p->parent[i].mode);
prefix = " ";
}
printf("%s%06o", prefix, p->mode);
/* Show sha1's */
for (i = 0; i < num_parent; i++)
printf(" %s", diff_unique_abbrev(p->parent[i].sha1,
opt->abbrev));
printf(" %s ", diff_unique_abbrev(p->sha1, opt->abbrev));
}
if (opt->output_format & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS)) {
for (i = 0; i < num_parent; i++)
putchar(p->parent[i].status);
putchar(inter_name_termination);
}
write_name_quoted(p->path, stdout, line_termination);
}
void show_combined_diff(struct combine_diff_path *p,
int num_parent,
int dense,
struct rev_info *rev)
{
struct diff_options *opt = &rev->diffopt;
if (!p->len)
return;
if (opt->output_format & (DIFF_FORMAT_RAW |
DIFF_FORMAT_NAME |
DIFF_FORMAT_NAME_STATUS))
show_raw_diff(p, num_parent, rev);
else if (opt->output_format & DIFF_FORMAT_PATCH)
show_patch_diff(p, num_parent, dense, rev);
}
void diff_tree_combined(const unsigned char *sha1,
const unsigned char parent[][20],
int num_parent,
int dense,
struct rev_info *rev)
{
struct diff_options *opt = &rev->diffopt;
struct diff_options diffopts;
struct combine_diff_path *p, *paths = NULL;
int i, num_paths, needsep, show_log_first;
diffopts = *opt;
diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
DIFF_OPT_SET(&diffopts, RECURSIVE);
DIFF_OPT_CLR(&diffopts, ALLOW_EXTERNAL);
show_log_first = !!rev->loginfo && !rev->no_commit_id;
needsep = 0;
/* find set of paths that everybody touches */
for (i = 0; i < num_parent; i++) {
/* show stat against the first parent even
* when doing combined diff.
*/
int stat_opt = (opt->output_format &
(DIFF_FORMAT_NUMSTAT|DIFF_FORMAT_DIFFSTAT));
if (i == 0 && stat_opt)
diffopts.output_format = stat_opt;
else
diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_tree_sha1(parent[i], sha1, "", &diffopts);
diffcore_std(&diffopts);
paths = intersect_paths(paths, i, num_parent);
if (show_log_first && i == 0) {
show_log(rev);
if (rev->verbose_header && opt->output_format)
putchar(opt->line_termination);
}
diff_flush(&diffopts);
}
/* find out surviving paths */
for (num_paths = 0, p = paths; p; p = p->next) {
if (p->len)
num_paths++;
}
if (num_paths) {
if (opt->output_format & (DIFF_FORMAT_RAW |
DIFF_FORMAT_NAME |
DIFF_FORMAT_NAME_STATUS)) {
for (p = paths; p; p = p->next) {
if (p->len)
show_raw_diff(p, num_parent, rev);
}
needsep = 1;
}
else if (opt->output_format &
(DIFF_FORMAT_NUMSTAT|DIFF_FORMAT_DIFFSTAT))
needsep = 1;
if (opt->output_format & DIFF_FORMAT_PATCH) {
if (needsep)
putchar(opt->line_termination);
for (p = paths; p; p = p->next) {
if (p->len)
show_patch_diff(p, num_parent, dense,
rev);
}
}
}
/* Clean things up */
while (paths) {
struct combine_diff_path *tmp = paths;
paths = paths->next;
free(tmp);
}
}
void diff_tree_combined_merge(const unsigned char *sha1,
int dense, struct rev_info *rev)
{
int num_parent;
const unsigned char (*parent)[20];
struct commit *commit = lookup_commit(sha1);
struct commit_list *parents;
/* count parents */
for (parents = commit->parents, num_parent = 0;
parents;
parents = parents->next, num_parent++)
; /* nothing */
parent = xmalloc(num_parent * sizeof(*parent));
for (parents = commit->parents, num_parent = 0;
parents;
parents = parents->next, num_parent++)
hashcpy((unsigned char *)(parent + num_parent),
parents->item->object.sha1);
diff_tree_combined(sha1, parent, num_parent, dense, rev);
}
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