diff options
Diffstat (limited to 'third_party/git/combine-diff.c')
| -rw-r--r-- | third_party/git/combine-diff.c | 1615 |
1 files changed, 1615 insertions, 0 deletions
diff --git a/third_party/git/combine-diff.c b/third_party/git/combine-diff.c new file mode 100644 index 0000000000..3e49f3bda8 --- /dev/null +++ b/third_party/git/combine-diff.c @@ -0,0 +1,1615 @@ +#include "cache.h" +#include "object-store.h" +#include "commit.h" +#include "blob.h" +#include "diff.h" +#include "diffcore.h" +#include "quote.h" +#include "xdiff-interface.h" +#include "xdiff/xmacros.h" +#include "log-tree.h" +#include "refs.h" +#include "userdiff.h" +#include "sha1-array.h" +#include "revision.h" + +static int compare_paths(const struct combine_diff_path *one, + const struct diff_filespec *two) +{ + if (!S_ISDIR(one->mode) && !S_ISDIR(two->mode)) + return strcmp(one->path, two->path); + + return base_name_compare(one->path, strlen(one->path), one->mode, + two->path, strlen(two->path), two->mode); +} + +static int filename_changed(char status) +{ + return status == 'R' || status == 'C'; +} + +static struct combine_diff_path *intersect_paths( + struct combine_diff_path *curr, + int n, + int num_parent, + int combined_all_paths) +{ + struct diff_queue_struct *q = &diff_queued_diff; + struct combine_diff_path *p, **tail = &curr; + int i, j, cmp; + + if (!n) { + 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->next = NULL; + memset(p->parent, 0, + sizeof(p->parent[0]) * num_parent); + + oidcpy(&p->oid, &q->queue[i]->two->oid); + p->mode = q->queue[i]->two->mode; + oidcpy(&p->parent[n].oid, &q->queue[i]->one->oid); + p->parent[n].mode = q->queue[i]->one->mode; + p->parent[n].status = q->queue[i]->status; + + if (combined_all_paths && + filename_changed(p->parent[n].status)) { + strbuf_init(&p->parent[n].path, 0); + strbuf_addstr(&p->parent[n].path, + q->queue[i]->one->path); + } + *tail = p; + tail = &p->next; + } + return curr; + } + + /* + * paths in curr (linked list) and q->queue[] (array) are + * both sorted in the tree order. + */ + i = 0; + while ((p = *tail) != NULL) { + cmp = ((i >= q->nr) + ? -1 : compare_paths(p, q->queue[i]->two)); + + if (cmp < 0) { + /* p->path not in q->queue[]; drop it */ + *tail = p->next; + for (j = 0; j < num_parent; j++) + if (combined_all_paths && + filename_changed(p->parent[j].status)) + strbuf_release(&p->parent[j].path); + free(p); + continue; + } + + if (cmp > 0) { + /* q->queue[i] not in p->path; skip it */ + i++; + continue; + } + + oidcpy(&p->parent[n].oid, &q->queue[i]->one->oid); + p->parent[n].mode = q->queue[i]->one->mode; + p->parent[n].status = q->queue[i]->status; + if (combined_all_paths && + filename_changed(p->parent[n].status)) + strbuf_addstr(&p->parent[n].path, + q->queue[i]->one->path); + + tail = &p->next; + i++; + } + return curr; +} + +/* Lines lost from parent */ +struct lline { + struct lline *next, *prev; + int len; + unsigned long parent_map; + char line[FLEX_ARRAY]; +}; + +/* Lines lost from current parent (before coalescing) */ +struct plost { + struct lline *lost_head, *lost_tail; + int len; +}; + +/* Lines surviving in the merge result */ +struct sline { + /* Accumulated and coalesced lost lines */ + struct lline *lost; + int lenlost; + struct plost plost; + 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 int match_string_spaces(const char *line1, int len1, + const char *line2, int len2, + long flags) +{ + if (flags & XDF_WHITESPACE_FLAGS) { + for (; len1 > 0 && XDL_ISSPACE(line1[len1 - 1]); len1--); + for (; len2 > 0 && XDL_ISSPACE(line2[len2 - 1]); len2--); + } + + if (!(flags & (XDF_IGNORE_WHITESPACE | XDF_IGNORE_WHITESPACE_CHANGE))) + return (len1 == len2 && !memcmp(line1, line2, len1)); + + while (len1 > 0 && len2 > 0) { + len1--; + len2--; + if (XDL_ISSPACE(line1[len1]) || XDL_ISSPACE(line2[len2])) { + if ((flags & XDF_IGNORE_WHITESPACE_CHANGE) && + (!XDL_ISSPACE(line1[len1]) || !XDL_ISSPACE(line2[len2]))) + return 0; + + for (; len1 > 0 && XDL_ISSPACE(line1[len1]); len1--); + for (; len2 > 0 && XDL_ISSPACE(line2[len2]); len2--); + } + if (line1[len1] != line2[len2]) + return 0; + } + + if (flags & XDF_IGNORE_WHITESPACE) { + /* Consume remaining spaces */ + for (; len1 > 0 && XDL_ISSPACE(line1[len1 - 1]); len1--); + for (; len2 > 0 && XDL_ISSPACE(line2[len2 - 1]); len2--); + } + + /* We matched full line1 and line2 */ + if (!len1 && !len2) + return 1; + + return 0; +} + +enum coalesce_direction { MATCH, BASE, NEW }; + +/* Coalesce new lines into base by finding LCS */ +static struct lline *coalesce_lines(struct lline *base, int *lenbase, + struct lline *newline, int lennew, + unsigned long parent, long flags) +{ + int **lcs; + enum coalesce_direction **directions; + struct lline *baseend, *newend = NULL; + int i, j, origbaselen = *lenbase; + + if (newline == NULL) + return base; + + if (base == NULL) { + *lenbase = lennew; + return newline; + } + + /* + * Coalesce new lines into base by finding the LCS + * - Create the table to run dynamic programming + * - Compute the LCS + * - Then reverse read the direction structure: + * - If we have MATCH, assign parent to base flag, and consume + * both baseend and newend + * - Else if we have BASE, consume baseend + * - Else if we have NEW, insert newend lline into base and + * consume newend + */ + lcs = xcalloc(st_add(origbaselen, 1), sizeof(int*)); + directions = xcalloc(st_add(origbaselen, 1), sizeof(enum coalesce_direction*)); + for (i = 0; i < origbaselen + 1; i++) { + lcs[i] = xcalloc(st_add(lennew, 1), sizeof(int)); + directions[i] = xcalloc(st_add(lennew, 1), sizeof(enum coalesce_direction)); + directions[i][0] = BASE; + } + for (j = 1; j < lennew + 1; j++) + directions[0][j] = NEW; + + for (i = 1, baseend = base; i < origbaselen + 1; i++) { + for (j = 1, newend = newline; j < lennew + 1; j++) { + if (match_string_spaces(baseend->line, baseend->len, + newend->line, newend->len, flags)) { + lcs[i][j] = lcs[i - 1][j - 1] + 1; + directions[i][j] = MATCH; + } else if (lcs[i][j - 1] >= lcs[i - 1][j]) { + lcs[i][j] = lcs[i][j - 1]; + directions[i][j] = NEW; + } else { + lcs[i][j] = lcs[i - 1][j]; + directions[i][j] = BASE; + } + if (newend->next) + newend = newend->next; + } + if (baseend->next) + baseend = baseend->next; + } + + for (i = 0; i < origbaselen + 1; i++) + free(lcs[i]); + free(lcs); + + /* At this point, baseend and newend point to the end of each lists */ + i--; + j--; + while (i != 0 || j != 0) { + if (directions[i][j] == MATCH) { + baseend->parent_map |= 1<<parent; + baseend = baseend->prev; + newend = newend->prev; + i--; + j--; + } else if (directions[i][j] == NEW) { + struct lline *lline; + + lline = newend; + /* Remove lline from new list and update newend */ + if (lline->prev) + lline->prev->next = lline->next; + else + newline = lline->next; + if (lline->next) + lline->next->prev = lline->prev; + + newend = lline->prev; + j--; + + /* Add lline to base list */ + if (baseend) { + lline->next = baseend->next; + lline->prev = baseend; + if (lline->prev) + lline->prev->next = lline; + } + else { + lline->next = base; + base = lline; + } + (*lenbase)++; + + if (lline->next) + lline->next->prev = lline; + + } else { + baseend = baseend->prev; + i--; + } + } + + newend = newline; + while (newend) { + struct lline *lline = newend; + newend = newend->next; + free(lline); + } + + for (i = 0; i < origbaselen + 1; i++) + free(directions[i]); + free(directions); + + return base; +} + +static char *grab_blob(struct repository *r, + const struct object_id *oid, unsigned int mode, + unsigned long *size, struct userdiff_driver *textconv, + const char *path) +{ + char *blob; + enum object_type type; + + if (S_ISGITLINK(mode)) { + struct strbuf buf = STRBUF_INIT; + strbuf_addf(&buf, "Subproject commit %s\n", oid_to_hex(oid)); + *size = buf.len; + blob = strbuf_detach(&buf, NULL); + } else if (is_null_oid(oid)) { + /* deleted blob */ + *size = 0; + return xcalloc(1, 1); + } else if (textconv) { + struct diff_filespec *df = alloc_filespec(path); + fill_filespec(df, oid, 1, mode); + *size = fill_textconv(r, textconv, df, &blob); + free_filespec(df); + } else { + blob = read_object_file(oid, &type, size); + if (type != OBJ_BLOB) + die("object '%s' is not a blob!", oid_to_hex(oid)); + } + 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--; + + FLEX_ALLOC_MEM(lline, line, line, len); + lline->len = len; + lline->next = NULL; + lline->prev = sline->plost.lost_tail; + if (lline->prev) + lline->prev->next = lline; + else + sline->plost.lost_head = lline; + sline->plost.lost_tail = lline; + sline->plost.len++; + lline->parent_map = this_mask; +} + +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_hunk(void *state_, + long ob, long on, + long nb, long nn, + const char *funcline, long funclen) +{ + struct combine_diff_state *state = state_; + + state->ob = ob; + state->on = on; + state->nb = nb; + state->nn = nn; + state->lno = state->nb; + 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, + * + * Note that this is correct even when N == 0, + * in which case the hunk removes the first + * line in the file. + */ + state->lost_bucket = &state->sline[state->nb]; + if (!state->nb) + state->nb = 1; + } 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; +} + +static void consume_line(void *state_, char *line, unsigned long len) +{ + struct combine_diff_state *state = state_; + 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(struct repository *r, + const struct object_id *parent, unsigned int mode, + mmfile_t *result_file, + struct sline *sline, unsigned int cnt, int n, + int num_parent, int result_deleted, + struct userdiff_driver *textconv, + const char *path, long flags) +{ + unsigned int p_lno, lno; + unsigned long nmask = (1UL << n); + xpparam_t xpp; + xdemitconf_t xecfg; + mmfile_t parent_file; + struct combine_diff_state state; + unsigned long sz; + + if (result_deleted) + return; /* result deleted */ + + parent_file.ptr = grab_blob(r, parent, mode, &sz, textconv, path); + parent_file.size = sz; + memset(&xpp, 0, sizeof(xpp)); + xpp.flags = flags; + 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; + + if (xdi_diff_outf(&parent_file, result_file, consume_hunk, + consume_line, &state, &xpp, &xecfg)) + die("unable to generate combined diff for %s", + oid_to_hex(parent)); + 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; + + /* Coalesce new lines */ + if (sline[lno].plost.lost_head) { + struct sline *sl = &sline[lno]; + sl->lost = coalesce_lines(sl->lost, &sl->lenlost, + sl->plost.lost_head, + sl->plost.len, n, flags); + sl->plost.lost_head = sl->plost.lost_tail = NULL; + sl->plost.len = 0; + } + + /* How many lines would this sline advance the p_lno? */ + ll = sline[lno].lost; + 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); +} + +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) { + if (!(sline[j].flag & mark)) + sline[j].flag |= no_pre_delete; + sline[j++].flag |= mark; + } + + 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 (la && 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; + 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, const char *line_prefix, + unsigned long cnt, int num_parent, + int use_color, int result_deleted) +{ + 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_func = diff_get_color(use_color, DIFF_FUNCINFO); + 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_context = diff_get_color(use_color, DIFF_CONTEXT); + const char *c_reset = diff_get_color(use_color, DIFF_RESET); + + if (result_deleted) + 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; + } + + printf("%s%s", line_prefix, c_frag); + 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) + printf("%s%s %s%s", c_reset, + c_context, c_reset, + c_func); + 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; + while (ll) { + printf("%s%s", line_prefix, c_old); + 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; + fputs(line_prefix, stdout); + if (!(sl->flag & (mark-1))) { + /* + * This sline was here to hang the + * lost lines in front of it. + */ + if (!context) + continue; + fputs(c_context, 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; + 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 *line_prefix, + const char *c_meta, const char *c_reset) +{ + static struct strbuf buf = STRBUF_INIT; + + strbuf_reset(&buf); + strbuf_addstr(&buf, line_prefix); + 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_combined_header(struct combine_diff_path *elem, + int num_parent, + int dense, + struct rev_info *rev, + const char *line_prefix, + int mode_differs, + int show_file_header) +{ + struct diff_options *opt = &rev->diffopt; + int abbrev = opt->flags.full_index ? GIT_SHA1_HEXSZ : DEFAULT_ABBREV; + const char *a_prefix = opt->a_prefix ? opt->a_prefix : "a/"; + const char *b_prefix = opt->b_prefix ? opt->b_prefix : "b/"; + const char *c_meta = diff_get_color_opt(opt, DIFF_METAINFO); + const char *c_reset = diff_get_color_opt(opt, DIFF_RESET); + const char *abb; + int added = 0; + int deleted = 0; + int i; + + if (rev->loginfo && !rev->no_commit_id) + show_log(rev); + + dump_quoted_path(dense ? "diff --cc " : "diff --combined ", + "", elem->path, line_prefix, c_meta, c_reset); + printf("%s%sindex ", line_prefix, c_meta); + for (i = 0; i < num_parent; i++) { + abb = find_unique_abbrev(&elem->parent[i].oid, + abbrev); + printf("%s%s", i ? "," : "", abb); + } + abb = find_unique_abbrev(&elem->oid, 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("%s%snew file mode %06o", + line_prefix, c_meta, elem->mode); + else { + if (deleted) + printf("%s%sdeleted file ", + line_prefix, 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 (!show_file_header) + return; + + if (rev->combined_all_paths) { + for (i = 0; i < num_parent; i++) { + char *path = filename_changed(elem->parent[i].status) + ? elem->parent[i].path.buf : elem->path; + if (elem->parent[i].status == DIFF_STATUS_ADDED) + dump_quoted_path("--- ", "", "/dev/null", + line_prefix, c_meta, c_reset); + else + dump_quoted_path("--- ", a_prefix, path, + line_prefix, c_meta, c_reset); + } + } else { + if (added) + dump_quoted_path("--- ", "", "/dev/null", + line_prefix, c_meta, c_reset); + else + dump_quoted_path("--- ", a_prefix, elem->path, + line_prefix, c_meta, c_reset); + } + if (deleted) + dump_quoted_path("+++ ", "", "/dev/null", + line_prefix, c_meta, c_reset); + else + dump_quoted_path("+++ ", b_prefix, elem->path, + line_prefix, c_meta, c_reset); +} + +static void show_patch_diff(struct combine_diff_path *elem, int num_parent, + int dense, int working_tree_file, + struct rev_info *rev) +{ + struct diff_options *opt = &rev->diffopt; + unsigned long result_size, cnt, lno; + int result_deleted = 0; + char *result, *cp; + struct sline *sline; /* survived lines */ + int mode_differs = 0; + int i, show_hunks; + mmfile_t result_file; + struct userdiff_driver *userdiff; + struct userdiff_driver *textconv = NULL; + int is_binary; + const char *line_prefix = diff_line_prefix(opt); + + context = opt->context; + userdiff = userdiff_find_by_path(opt->repo->index, elem->path); + if (!userdiff) + userdiff = userdiff_find_by_name("default"); + if (opt->flags.allow_textconv) + textconv = userdiff_get_textconv(opt->repo, userdiff); + + /* Read the result of merge first */ + if (!working_tree_file) + result = grab_blob(opt->repo, &elem->oid, elem->mode, &result_size, + textconv, elem->path); + 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_errno("readlink(%s)", elem->path); + return; + } + result_size = buf.len; + result = strbuf_detach(&buf, NULL); + elem->mode = canon_mode(st.st_mode); + } else if (S_ISDIR(st.st_mode)) { + struct object_id oid; + if (resolve_gitlink_ref(elem->path, "HEAD", &oid) < 0) + result = grab_blob(opt->repo, &elem->oid, + elem->mode, &result_size, + NULL, NULL); + else + result = grab_blob(opt->repo, &oid, elem->mode, + &result_size, NULL, NULL); + } else if (textconv) { + struct diff_filespec *df = alloc_filespec(elem->path); + fill_filespec(df, &null_oid, 0, st.st_mode); + result_size = fill_textconv(opt->repo, textconv, df, &result); + free_filespec(df); + } 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 = xmallocz(len); + + 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); + + /* If not a fake symlink, apply filters, e.g. autocrlf */ + if (is_file) { + struct strbuf buf = STRBUF_INIT; + + if (convert_to_git(rev->diffopt.repo->index, + elem->path, result, len, &buf, global_conv_flags_eol)) { + free(result); + result = strbuf_detach(&buf, &len); + result_size = len; + } + } + } + else { + deleted_file: + result_deleted = 1; + result_size = 0; + elem->mode = 0; + result = xcalloc(1, 1); + } + + if (0 <= fd) + close(fd); + } + + for (i = 0; i < num_parent; i++) { + if (elem->parent[i].mode != elem->mode) { + mode_differs = 1; + break; + } + } + + if (textconv) + is_binary = 0; + else if (userdiff->binary != -1) + is_binary = userdiff->binary; + else { + is_binary = buffer_is_binary(result, result_size); + for (i = 0; !is_binary && i < num_parent; i++) { + char *buf; + unsigned long size; + buf = grab_blob(opt->repo, + &elem->parent[i].oid, + elem->parent[i].mode, + &size, NULL, NULL); + if (buffer_is_binary(buf, size)) + is_binary = 1; + free(buf); + } + } + if (is_binary) { + show_combined_header(elem, num_parent, dense, rev, + line_prefix, mode_differs, 0); + printf("Binary files differ\n"); + free(result); + return; + } + + 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(st_add(cnt, 2), sizeof(*sline)); + sline[0].bol = result; + 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(st_mult(st_add(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 (oideq(&elem->parent[i].oid, + &elem->parent[j].oid)) { + reuse_combine_diff(sline, cnt, i, j); + break; + } + } + if (i <= j) + combine_diff(opt->repo, + &elem->parent[i].oid, + elem->parent[i].mode, + &result_file, sline, + cnt, i, num_parent, result_deleted, + textconv, elem->path, opt->xdl_opts); + } + + show_hunks = make_hunks(sline, cnt, num_parent, dense); + + if (show_hunks || mode_differs || working_tree_file) { + show_combined_header(elem, num_parent, dense, rev, + line_prefix, mode_differs, 1); + dump_sline(sline, line_prefix, cnt, num_parent, + opt->use_color, result_deleted); + } + free(result); + + for (lno = 0; lno < cnt; lno++) { + if (sline[lno].lost) { + struct lline *ll = sline[lno].lost; + while (ll) { + struct lline *tmp = ll; + ll = ll->next; + free(tmp); + } + } + } + free(sline[0].p_lno); + free(sline); +} + +static void show_raw_diff(struct combine_diff_path *p, int num_parent, struct rev_info *rev) +{ + struct diff_options *opt = &rev->diffopt; + int line_termination, inter_name_termination, i; + const char *line_prefix = diff_line_prefix(opt); + + 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) { + printf("%s", line_prefix); + + /* As many colons as there are parents */ + for (i = 0; i < num_parent; i++) + putchar(':'); + + /* Show the modes */ + for (i = 0; i < num_parent; i++) + printf("%06o ", p->parent[i].mode); + printf("%06o", p->mode); + + /* Show sha1's */ + for (i = 0; i < num_parent; i++) + printf(" %s", diff_aligned_abbrev(&p->parent[i].oid, + opt->abbrev)); + printf(" %s ", diff_aligned_abbrev(&p->oid, 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); + } + + for (i = 0; i < num_parent; i++) + if (rev->combined_all_paths) { + if (filename_changed(p->parent[i].status)) + write_name_quoted(p->parent[i].path.buf, stdout, + inter_name_termination); + else + write_name_quoted(p->path, stdout, + inter_name_termination); + } + write_name_quoted(p->path, stdout, line_termination); +} + +/* + * The result (p->elem) is from the working tree and their + * parents are typically from multiple stages during a merge + * (i.e. diff-files) or the state in HEAD and in the index + * (i.e. diff-index). + */ +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 (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, 1, rev); +} + +static void free_combined_pair(struct diff_filepair *pair) +{ + free(pair->two); + free(pair); +} + +/* + * A combine_diff_path expresses N parents on the LHS against 1 merge + * result. Synthesize a diff_filepair that has N entries on the "one" + * side and 1 entry on the "two" side. + * + * In the future, we might want to add more data to combine_diff_path + * so that we can fill fields we are ignoring (most notably, size) here, + * but currently nobody uses it, so this should suffice for now. + */ +static struct diff_filepair *combined_pair(struct combine_diff_path *p, + int num_parent) +{ + int i; + struct diff_filepair *pair; + struct diff_filespec *pool; + + pair = xmalloc(sizeof(*pair)); + pool = xcalloc(st_add(num_parent, 1), sizeof(struct diff_filespec)); + pair->one = pool + 1; + pair->two = pool; + + for (i = 0; i < num_parent; i++) { + pair->one[i].path = p->path; + pair->one[i].mode = p->parent[i].mode; + oidcpy(&pair->one[i].oid, &p->parent[i].oid); + pair->one[i].oid_valid = !is_null_oid(&p->parent[i].oid); + pair->one[i].has_more_entries = 1; + } + pair->one[num_parent - 1].has_more_entries = 0; + + pair->two->path = p->path; + pair->two->mode = p->mode; + oidcpy(&pair->two->oid, &p->oid); + pair->two->oid_valid = !is_null_oid(&p->oid); + return pair; +} + +static void handle_combined_callback(struct diff_options *opt, + struct combine_diff_path *paths, + int num_parent, + int num_paths) +{ + struct combine_diff_path *p; + struct diff_queue_struct q; + int i; + + q.queue = xcalloc(num_paths, sizeof(struct diff_filepair *)); + q.alloc = num_paths; + q.nr = num_paths; + for (i = 0, p = paths; p; p = p->next) + q.queue[i++] = combined_pair(p, num_parent); + opt->format_callback(&q, opt, opt->format_callback_data); + for (i = 0; i < num_paths; i++) + free_combined_pair(q.queue[i]); + free(q.queue); +} + +static const char *path_path(void *obj) +{ + struct combine_diff_path *path = (struct combine_diff_path *)obj; + + return path->path; +} + +/* + * Diff stat formats which we always compute solely against the first parent. + */ +#define STAT_FORMAT_MASK (DIFF_FORMAT_NUMSTAT \ + | DIFF_FORMAT_SHORTSTAT \ + | DIFF_FORMAT_SUMMARY \ + | DIFF_FORMAT_DIRSTAT \ + | DIFF_FORMAT_DIFFSTAT) + +/* find set of paths that every parent touches */ +static struct combine_diff_path *find_paths_generic(const struct object_id *oid, + const struct oid_array *parents, + struct diff_options *opt, + int combined_all_paths) +{ + struct combine_diff_path *paths = NULL; + int i, num_parent = parents->nr; + + int output_format = opt->output_format; + const char *orderfile = opt->orderfile; + + opt->output_format = DIFF_FORMAT_NO_OUTPUT; + /* tell diff_tree to emit paths in sorted (=tree) order */ + opt->orderfile = NULL; + + /* D(A,P1...Pn) = D(A,P1) ^ ... ^ D(A,Pn) (wrt paths) */ + for (i = 0; i < num_parent; i++) { + /* + * show stat against the first parent even when doing + * combined diff. + */ + int stat_opt = output_format & STAT_FORMAT_MASK; + if (i == 0 && stat_opt) + opt->output_format = stat_opt; + else + opt->output_format = DIFF_FORMAT_NO_OUTPUT; + diff_tree_oid(&parents->oid[i], oid, "", opt); + diffcore_std(opt); + paths = intersect_paths(paths, i, num_parent, + combined_all_paths); + + /* if showing diff, show it in requested order */ + if (opt->output_format != DIFF_FORMAT_NO_OUTPUT && + orderfile) { + diffcore_order(orderfile); + } + + diff_flush(opt); + } + + opt->output_format = output_format; + opt->orderfile = orderfile; + return paths; +} + + +/* + * find set of paths that everybody touches, assuming diff is run without + * rename/copy detection, etc, comparing all trees simultaneously (= faster). + */ +static struct combine_diff_path *find_paths_multitree( + const struct object_id *oid, const struct oid_array *parents, + struct diff_options *opt) +{ + int i, nparent = parents->nr; + const struct object_id **parents_oid; + struct combine_diff_path paths_head; + struct strbuf base; + + ALLOC_ARRAY(parents_oid, nparent); + for (i = 0; i < nparent; i++) + parents_oid[i] = &parents->oid[i]; + + /* fake list head, so worker can assume it is non-NULL */ + paths_head.next = NULL; + + strbuf_init(&base, PATH_MAX); + diff_tree_paths(&paths_head, oid, parents_oid, nparent, &base, opt); + + strbuf_release(&base); + free(parents_oid); + return paths_head.next; +} + + +void diff_tree_combined(const struct object_id *oid, + const struct oid_array *parents, + int dense, + struct rev_info *rev) +{ + struct diff_options *opt = &rev->diffopt; + struct diff_options diffopts; + struct combine_diff_path *p, *paths; + int i, num_paths, needsep, show_log_first, num_parent = parents->nr; + int need_generic_pathscan; + + /* nothing to do, if no parents */ + if (!num_parent) + return; + + show_log_first = !!rev->loginfo && !rev->no_commit_id; + needsep = 0; + if (show_log_first) { + show_log(rev); + + if (rev->verbose_header && opt->output_format && + opt->output_format != DIFF_FORMAT_NO_OUTPUT && + !commit_format_is_empty(rev->commit_format)) + printf("%s%c", diff_line_prefix(opt), + opt->line_termination); + } + + diffopts = *opt; + copy_pathspec(&diffopts.pathspec, &opt->pathspec); + diffopts.flags.recursive = 1; + diffopts.flags.allow_external = 0; + + /* find set of paths that everybody touches + * + * NOTE + * + * Diffcore transformations are bound to diff_filespec and logic + * comparing two entries - i.e. they do not apply directly to combine + * diff. + * + * If some of such transformations is requested - we launch generic + * path scanning, which works significantly slower compared to + * simultaneous all-trees-in-one-go scan in find_paths_multitree(). + * + * TODO some of the filters could be ported to work on + * combine_diff_paths - i.e. all functionality that skips paths, so in + * theory, we could end up having only multitree path scanning. + * + * NOTE please keep this semantically in sync with diffcore_std() + */ + need_generic_pathscan = opt->skip_stat_unmatch || + opt->flags.follow_renames || + opt->break_opt != -1 || + opt->detect_rename || + (opt->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK) || + opt->filter; + + + if (need_generic_pathscan) { + /* + * NOTE generic case also handles --stat, as it computes + * diff(sha1,parent_i) for all i to do the job, specifically + * for parent0. + */ + paths = find_paths_generic(oid, parents, &diffopts, + rev->combined_all_paths); + } + else { + int stat_opt; + paths = find_paths_multitree(oid, parents, &diffopts); + + /* + * show stat against the first parent even + * when doing combined diff. + */ + stat_opt = opt->output_format & STAT_FORMAT_MASK; + if (stat_opt) { + diffopts.output_format = stat_opt; + + diff_tree_oid(&parents->oid[0], oid, "", &diffopts); + diffcore_std(&diffopts); + if (opt->orderfile) + diffcore_order(opt->orderfile); + diff_flush(&diffopts); + } + } + + /* find out number of surviving paths */ + for (num_paths = 0, p = paths; p; p = p->next) + num_paths++; + + /* order paths according to diffcore_order */ + if (opt->orderfile && num_paths) { + struct obj_order *o; + + ALLOC_ARRAY(o, num_paths); + for (i = 0, p = paths; p; p = p->next, i++) + o[i].obj = p; + order_objects(opt->orderfile, path_path, o, num_paths); + for (i = 0; i < num_paths - 1; i++) { + p = o[i].obj; + p->next = o[i+1].obj; + } + + p = o[num_paths-1].obj; + p->next = NULL; + paths = o[0].obj; + free(o); + } + + + if (num_paths) { + if (opt->output_format & (DIFF_FORMAT_RAW | + DIFF_FORMAT_NAME | + DIFF_FORMAT_NAME_STATUS)) { + for (p = paths; p; p = p->next) + show_raw_diff(p, num_parent, rev); + needsep = 1; + } + else if (opt->output_format & STAT_FORMAT_MASK) + needsep = 1; + else if (opt->output_format & DIFF_FORMAT_CALLBACK) + handle_combined_callback(opt, paths, num_parent, num_paths); + + if (opt->output_format & DIFF_FORMAT_PATCH) { + if (needsep) + printf("%s%c", diff_line_prefix(opt), + opt->line_termination); + for (p = paths; p; p = p->next) + show_patch_diff(p, num_parent, dense, + 0, rev); + } + } + + /* Clean things up */ + while (paths) { + struct combine_diff_path *tmp = paths; + paths = paths->next; + for (i = 0; i < num_parent; i++) + if (rev->combined_all_paths && + filename_changed(tmp->parent[i].status)) + strbuf_release(&tmp->parent[i].path); + free(tmp); + } + + clear_pathspec(&diffopts.pathspec); +} + +void diff_tree_combined_merge(const struct commit *commit, int dense, + struct rev_info *rev) +{ + struct commit_list *parent = get_saved_parents(rev, commit); + struct oid_array parents = OID_ARRAY_INIT; + + while (parent) { + oid_array_append(&parents, &parent->item->object.oid); + parent = parent->next; + } + diff_tree_combined(&commit->object.oid, &parents, dense, rev); + oid_array_clear(&parents); +} |