diff options
Diffstat (limited to 'commit.c')
| -rw-r--r-- | commit.c | 1413 |
1 files changed, 1413 insertions, 0 deletions
diff --git a/commit.c b/commit.c new file mode 100644 index 0000000000..5632e32685 --- /dev/null +++ b/commit.c @@ -0,0 +1,1413 @@ +#include "cache.h" +#include "tag.h" +#include "commit.h" +#include "pkt-line.h" +#include "utf8.h" +#include "interpolate.h" +#include "diff.h" +#include "revision.h" + +int save_commit_buffer = 1; + +struct sort_node +{ + /* + * the number of children of the associated commit + * that also occur in the list being sorted. + */ + unsigned int indegree; + + /* + * reference to original list item that we will re-use + * on output. + */ + struct commit_list * list_item; + +}; + +const char *commit_type = "commit"; + +struct cmt_fmt_map { + const char *n; + size_t cmp_len; + enum cmit_fmt v; +} cmt_fmts[] = { + { "raw", 1, CMIT_FMT_RAW }, + { "medium", 1, CMIT_FMT_MEDIUM }, + { "short", 1, CMIT_FMT_SHORT }, + { "email", 1, CMIT_FMT_EMAIL }, + { "full", 5, CMIT_FMT_FULL }, + { "fuller", 5, CMIT_FMT_FULLER }, + { "oneline", 1, CMIT_FMT_ONELINE }, + { "format:", 7, CMIT_FMT_USERFORMAT}, +}; + +static char *user_format; + +enum cmit_fmt get_commit_format(const char *arg) +{ + int i; + + if (!arg || !*arg) + return CMIT_FMT_DEFAULT; + if (*arg == '=') + arg++; + if (!prefixcmp(arg, "format:")) { + if (user_format) + free(user_format); + user_format = xstrdup(arg + 7); + return CMIT_FMT_USERFORMAT; + } + for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) { + if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len) && + !strncmp(arg, cmt_fmts[i].n, strlen(arg))) + return cmt_fmts[i].v; + } + + die("invalid --pretty format: %s", arg); +} + +static struct commit *check_commit(struct object *obj, + const unsigned char *sha1, + int quiet) +{ + if (obj->type != OBJ_COMMIT) { + if (!quiet) + error("Object %s is a %s, not a commit", + sha1_to_hex(sha1), typename(obj->type)); + return NULL; + } + return (struct commit *) obj; +} + +struct commit *lookup_commit_reference_gently(const unsigned char *sha1, + int quiet) +{ + struct object *obj = deref_tag(parse_object(sha1), NULL, 0); + + if (!obj) + return NULL; + return check_commit(obj, sha1, quiet); +} + +struct commit *lookup_commit_reference(const unsigned char *sha1) +{ + return lookup_commit_reference_gently(sha1, 0); +} + +struct commit *lookup_commit(const unsigned char *sha1) +{ + struct object *obj = lookup_object(sha1); + if (!obj) + return create_object(sha1, OBJ_COMMIT, alloc_commit_node()); + if (!obj->type) + obj->type = OBJ_COMMIT; + return check_commit(obj, sha1, 0); +} + +static unsigned long parse_commit_date(const char *buf) +{ + unsigned long date; + + if (memcmp(buf, "author", 6)) + return 0; + while (*buf++ != '\n') + /* nada */; + if (memcmp(buf, "committer", 9)) + return 0; + while (*buf++ != '>') + /* nada */; + date = strtoul(buf, NULL, 10); + if (date == ULONG_MAX) + date = 0; + return date; +} + +static struct commit_graft **commit_graft; +static int commit_graft_alloc, commit_graft_nr; + +static int commit_graft_pos(const unsigned char *sha1) +{ + int lo, hi; + lo = 0; + hi = commit_graft_nr; + while (lo < hi) { + int mi = (lo + hi) / 2; + struct commit_graft *graft = commit_graft[mi]; + int cmp = hashcmp(sha1, graft->sha1); + if (!cmp) + return mi; + if (cmp < 0) + hi = mi; + else + lo = mi + 1; + } + return -lo - 1; +} + +int register_commit_graft(struct commit_graft *graft, int ignore_dups) +{ + int pos = commit_graft_pos(graft->sha1); + + if (0 <= pos) { + if (ignore_dups) + free(graft); + else { + free(commit_graft[pos]); + commit_graft[pos] = graft; + } + return 1; + } + pos = -pos - 1; + if (commit_graft_alloc <= ++commit_graft_nr) { + commit_graft_alloc = alloc_nr(commit_graft_alloc); + commit_graft = xrealloc(commit_graft, + sizeof(*commit_graft) * + commit_graft_alloc); + } + if (pos < commit_graft_nr) + memmove(commit_graft + pos + 1, + commit_graft + pos, + (commit_graft_nr - pos - 1) * + sizeof(*commit_graft)); + commit_graft[pos] = graft; + return 0; +} + +struct commit_graft *read_graft_line(char *buf, int len) +{ + /* The format is just "Commit Parent1 Parent2 ...\n" */ + int i; + struct commit_graft *graft = NULL; + + if (buf[len-1] == '\n') + buf[--len] = 0; + if (buf[0] == '#' || buf[0] == '\0') + return NULL; + if ((len + 1) % 41) { + bad_graft_data: + error("bad graft data: %s", buf); + free(graft); + return NULL; + } + i = (len + 1) / 41 - 1; + graft = xmalloc(sizeof(*graft) + 20 * i); + graft->nr_parent = i; + if (get_sha1_hex(buf, graft->sha1)) + goto bad_graft_data; + for (i = 40; i < len; i += 41) { + if (buf[i] != ' ') + goto bad_graft_data; + if (get_sha1_hex(buf + i + 1, graft->parent[i/41])) + goto bad_graft_data; + } + return graft; +} + +int read_graft_file(const char *graft_file) +{ + FILE *fp = fopen(graft_file, "r"); + char buf[1024]; + if (!fp) + return -1; + while (fgets(buf, sizeof(buf), fp)) { + /* The format is just "Commit Parent1 Parent2 ...\n" */ + int len = strlen(buf); + struct commit_graft *graft = read_graft_line(buf, len); + if (!graft) + continue; + if (register_commit_graft(graft, 1)) + error("duplicate graft data: %s", buf); + } + fclose(fp); + return 0; +} + +static void prepare_commit_graft(void) +{ + static int commit_graft_prepared; + char *graft_file; + + if (commit_graft_prepared) + return; + graft_file = get_graft_file(); + read_graft_file(graft_file); + /* make sure shallows are read */ + is_repository_shallow(); + commit_graft_prepared = 1; +} + +static struct commit_graft *lookup_commit_graft(const unsigned char *sha1) +{ + int pos; + prepare_commit_graft(); + pos = commit_graft_pos(sha1); + if (pos < 0) + return NULL; + return commit_graft[pos]; +} + +int write_shallow_commits(int fd, int use_pack_protocol) +{ + int i, count = 0; + for (i = 0; i < commit_graft_nr; i++) + if (commit_graft[i]->nr_parent < 0) { + const char *hex = + sha1_to_hex(commit_graft[i]->sha1); + count++; + if (use_pack_protocol) + packet_write(fd, "shallow %s", hex); + else { + if (write_in_full(fd, hex, 40) != 40) + break; + if (write_in_full(fd, "\n", 1) != 1) + break; + } + } + return count; +} + +int unregister_shallow(const unsigned char *sha1) +{ + int pos = commit_graft_pos(sha1); + if (pos < 0) + return -1; + if (pos + 1 < commit_graft_nr) + memcpy(commit_graft + pos, commit_graft + pos + 1, + sizeof(struct commit_graft *) + * (commit_graft_nr - pos - 1)); + commit_graft_nr--; + return 0; +} + +int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size) +{ + char *tail = buffer; + char *bufptr = buffer; + unsigned char parent[20]; + struct commit_list **pptr; + struct commit_graft *graft; + unsigned n_refs = 0; + + if (item->object.parsed) + return 0; + item->object.parsed = 1; + tail += size; + if (tail <= bufptr + 5 || memcmp(bufptr, "tree ", 5)) + return error("bogus commit object %s", sha1_to_hex(item->object.sha1)); + if (tail <= bufptr + 45 || get_sha1_hex(bufptr + 5, parent) < 0) + return error("bad tree pointer in commit %s", + sha1_to_hex(item->object.sha1)); + item->tree = lookup_tree(parent); + if (item->tree) + n_refs++; + bufptr += 46; /* "tree " + "hex sha1" + "\n" */ + pptr = &item->parents; + + graft = lookup_commit_graft(item->object.sha1); + while (bufptr + 48 < tail && !memcmp(bufptr, "parent ", 7)) { + struct commit *new_parent; + + if (tail <= bufptr + 48 || + get_sha1_hex(bufptr + 7, parent) || + bufptr[47] != '\n') + return error("bad parents in commit %s", sha1_to_hex(item->object.sha1)); + bufptr += 48; + if (graft) + continue; + new_parent = lookup_commit(parent); + if (new_parent) { + pptr = &commit_list_insert(new_parent, pptr)->next; + n_refs++; + } + } + if (graft) { + int i; + struct commit *new_parent; + for (i = 0; i < graft->nr_parent; i++) { + new_parent = lookup_commit(graft->parent[i]); + if (!new_parent) + continue; + pptr = &commit_list_insert(new_parent, pptr)->next; + n_refs++; + } + } + item->date = parse_commit_date(bufptr); + + if (track_object_refs) { + unsigned i = 0; + struct commit_list *p; + struct object_refs *refs = alloc_object_refs(n_refs); + if (item->tree) + refs->ref[i++] = &item->tree->object; + for (p = item->parents; p; p = p->next) + refs->ref[i++] = &p->item->object; + set_object_refs(&item->object, refs); + } + + return 0; +} + +int parse_commit(struct commit *item) +{ + enum object_type type; + void *buffer; + unsigned long size; + int ret; + + if (item->object.parsed) + return 0; + buffer = read_sha1_file(item->object.sha1, &type, &size); + if (!buffer) + return error("Could not read %s", + sha1_to_hex(item->object.sha1)); + if (type != OBJ_COMMIT) { + free(buffer); + return error("Object %s not a commit", + sha1_to_hex(item->object.sha1)); + } + ret = parse_commit_buffer(item, buffer, size); + if (save_commit_buffer && !ret) { + item->buffer = buffer; + return 0; + } + free(buffer); + return ret; +} + +struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p) +{ + struct commit_list *new_list = xmalloc(sizeof(struct commit_list)); + new_list->item = item; + new_list->next = *list_p; + *list_p = new_list; + return new_list; +} + +void free_commit_list(struct commit_list *list) +{ + while (list) { + struct commit_list *temp = list; + list = temp->next; + free(temp); + } +} + +struct commit_list * insert_by_date(struct commit *item, struct commit_list **list) +{ + struct commit_list **pp = list; + struct commit_list *p; + while ((p = *pp) != NULL) { + if (p->item->date < item->date) { + break; + } + pp = &p->next; + } + return commit_list_insert(item, pp); +} + + +void sort_by_date(struct commit_list **list) +{ + struct commit_list *ret = NULL; + while (*list) { + insert_by_date((*list)->item, &ret); + *list = (*list)->next; + } + *list = ret; +} + +struct commit *pop_most_recent_commit(struct commit_list **list, + unsigned int mark) +{ + struct commit *ret = (*list)->item; + struct commit_list *parents = ret->parents; + struct commit_list *old = *list; + + *list = (*list)->next; + free(old); + + while (parents) { + struct commit *commit = parents->item; + parse_commit(commit); + if (!(commit->object.flags & mark)) { + commit->object.flags |= mark; + insert_by_date(commit, list); + } + parents = parents->next; + } + return ret; +} + +void clear_commit_marks(struct commit *commit, unsigned int mark) +{ + struct commit_list *parents; + + commit->object.flags &= ~mark; + parents = commit->parents; + while (parents) { + struct commit *parent = parents->item; + + /* Have we already cleared this? */ + if (mark & parent->object.flags) + clear_commit_marks(parent, mark); + parents = parents->next; + } +} + +/* + * Generic support for pretty-printing the header + */ +static int get_one_line(const char *msg, unsigned long len) +{ + int ret = 0; + + while (len--) { + char c = *msg++; + if (!c) + break; + ret++; + if (c == '\n') + break; + } + return ret; +} + +/* High bit set, or ISO-2022-INT */ +static int non_ascii(int ch) +{ + ch = (ch & 0xff); + return ((ch & 0x80) || (ch == 0x1b)); +} + +static int is_rfc2047_special(char ch) +{ + return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_')); +} + +static int add_rfc2047(char *buf, const char *line, int len, + const char *encoding) +{ + char *bp = buf; + int i, needquote; + char q_encoding[128]; + const char *q_encoding_fmt = "=?%s?q?"; + + for (i = needquote = 0; !needquote && i < len; i++) { + int ch = line[i]; + if (non_ascii(ch)) + needquote++; + if ((i + 1 < len) && + (ch == '=' && line[i+1] == '?')) + needquote++; + } + if (!needquote) + return sprintf(buf, "%.*s", len, line); + + i = snprintf(q_encoding, sizeof(q_encoding), q_encoding_fmt, encoding); + if (sizeof(q_encoding) < i) + die("Insanely long encoding name %s", encoding); + memcpy(bp, q_encoding, i); + bp += i; + for (i = 0; i < len; i++) { + unsigned ch = line[i] & 0xFF; + /* + * We encode ' ' using '=20' even though rfc2047 + * allows using '_' for readability. Unfortunately, + * many programs do not understand this and just + * leave the underscore in place. + */ + if (is_rfc2047_special(ch) || ch == ' ') { + sprintf(bp, "=%02X", ch); + bp += 3; + } + else + *bp++ = ch; + } + memcpy(bp, "?=", 2); + bp += 2; + return bp - buf; +} + +static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf, + const char *line, enum date_mode dmode, + const char *encoding) +{ + char *date; + int namelen; + unsigned long time; + int tz, ret; + const char *filler = " "; + + if (fmt == CMIT_FMT_ONELINE) + return 0; + date = strchr(line, '>'); + if (!date) + return 0; + namelen = ++date - line; + time = strtoul(date, &date, 10); + tz = strtol(date, NULL, 10); + + if (fmt == CMIT_FMT_EMAIL) { + char *name_tail = strchr(line, '<'); + int display_name_length; + if (!name_tail) + return 0; + while (line < name_tail && isspace(name_tail[-1])) + name_tail--; + display_name_length = name_tail - line; + filler = ""; + strcpy(buf, "From: "); + ret = strlen(buf); + ret += add_rfc2047(buf + ret, line, display_name_length, + encoding); + memcpy(buf + ret, name_tail, namelen - display_name_length); + ret += namelen - display_name_length; + buf[ret++] = '\n'; + } + else { + ret = sprintf(buf, "%s: %.*s%.*s\n", what, + (fmt == CMIT_FMT_FULLER) ? 4 : 0, + filler, namelen, line); + } + switch (fmt) { + case CMIT_FMT_MEDIUM: + ret += sprintf(buf + ret, "Date: %s\n", + show_date(time, tz, dmode)); + break; + case CMIT_FMT_EMAIL: + ret += sprintf(buf + ret, "Date: %s\n", + show_rfc2822_date(time, tz)); + break; + case CMIT_FMT_FULLER: + ret += sprintf(buf + ret, "%sDate: %s\n", what, + show_date(time, tz, dmode)); + break; + default: + /* notin' */ + break; + } + return ret; +} + +static int is_empty_line(const char *line, int *len_p) +{ + int len = *len_p; + while (len && isspace(line[len-1])) + len--; + *len_p = len; + return !len; +} + +static int add_merge_info(enum cmit_fmt fmt, char *buf, const struct commit *commit, int abbrev) +{ + struct commit_list *parent = commit->parents; + int offset; + + if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) || + !parent || !parent->next) + return 0; + + offset = sprintf(buf, "Merge:"); + + while (parent) { + struct commit *p = parent->item; + const char *hex = NULL; + const char *dots; + if (abbrev) + hex = find_unique_abbrev(p->object.sha1, abbrev); + if (!hex) + hex = sha1_to_hex(p->object.sha1); + dots = (abbrev && strlen(hex) != 40) ? "..." : ""; + parent = parent->next; + + offset += sprintf(buf + offset, " %s%s", hex, dots); + } + buf[offset++] = '\n'; + return offset; +} + +static char *get_header(const struct commit *commit, const char *key) +{ + int key_len = strlen(key); + const char *line = commit->buffer; + + for (;;) { + const char *eol = strchr(line, '\n'), *next; + + if (line == eol) + return NULL; + if (!eol) { + eol = line + strlen(line); + next = NULL; + } else + next = eol + 1; + if (eol - line > key_len && + !strncmp(line, key, key_len) && + line[key_len] == ' ') { + int len = eol - line - key_len; + char *ret = xmalloc(len); + memcpy(ret, line + key_len + 1, len - 1); + ret[len - 1] = '\0'; + return ret; + } + line = next; + } +} + +static char *replace_encoding_header(char *buf, const char *encoding) +{ + char *encoding_header = strstr(buf, "\nencoding "); + char *header_end = strstr(buf, "\n\n"); + char *end_of_encoding_header; + int encoding_header_pos; + int encoding_header_len; + int new_len; + int need_len; + int buflen = strlen(buf) + 1; + + if (!header_end) + header_end = buf + buflen; + if (!encoding_header || encoding_header >= header_end) + return buf; + encoding_header++; + end_of_encoding_header = strchr(encoding_header, '\n'); + if (!end_of_encoding_header) + return buf; /* should not happen but be defensive */ + end_of_encoding_header++; + + encoding_header_len = end_of_encoding_header - encoding_header; + encoding_header_pos = encoding_header - buf; + + if (is_encoding_utf8(encoding)) { + /* we have re-coded to UTF-8; drop the header */ + memmove(encoding_header, end_of_encoding_header, + buflen - (encoding_header_pos + encoding_header_len)); + return buf; + } + new_len = strlen(encoding); + need_len = new_len + strlen("encoding \n"); + if (encoding_header_len < need_len) { + buf = xrealloc(buf, buflen + (need_len - encoding_header_len)); + encoding_header = buf + encoding_header_pos; + end_of_encoding_header = encoding_header + encoding_header_len; + } + memmove(end_of_encoding_header + (need_len - encoding_header_len), + end_of_encoding_header, + buflen - (encoding_header_pos + encoding_header_len)); + memcpy(encoding_header + 9, encoding, strlen(encoding)); + encoding_header[9 + new_len] = '\n'; + return buf; +} + +static char *logmsg_reencode(const struct commit *commit, + const char *output_encoding) +{ + static const char *utf8 = "utf-8"; + const char *use_encoding; + char *encoding; + char *out; + + if (!*output_encoding) + return NULL; + encoding = get_header(commit, "encoding"); + use_encoding = encoding ? encoding : utf8; + if (!strcmp(use_encoding, output_encoding)) + out = xstrdup(commit->buffer); + else + out = reencode_string(commit->buffer, + output_encoding, use_encoding); + if (out) + out = replace_encoding_header(out, output_encoding); + + free(encoding); + return out; +} + +static void fill_person(struct interp *table, const char *msg, int len) +{ + int start, end, tz = 0; + unsigned long date; + char *ep; + + /* parse name */ + for (end = 0; end < len && msg[end] != '<'; end++) + ; /* do nothing */ + start = end + 1; + while (end > 0 && isspace(msg[end - 1])) + end--; + table[0].value = xstrndup(msg, end); + + if (start >= len) + return; + + /* parse email */ + for (end = start + 1; end < len && msg[end] != '>'; end++) + ; /* do nothing */ + + if (end >= len) + return; + + table[1].value = xstrndup(msg + start, end - start); + + /* parse date */ + for (start = end + 1; start < len && isspace(msg[start]); start++) + ; /* do nothing */ + if (start >= len) + return; + date = strtoul(msg + start, &ep, 10); + if (msg + start == ep) + return; + + table[5].value = xstrndup(msg + start, ep - (msg + start)); + + /* parse tz */ + for (start = ep - msg + 1; start < len && isspace(msg[start]); start++) + ; /* do nothing */ + if (start + 1 < len) { + tz = strtoul(msg + start + 1, NULL, 10); + if (msg[start] == '-') + tz = -tz; + } + + interp_set_entry(table, 2, show_date(date, tz, 0)); + interp_set_entry(table, 3, show_rfc2822_date(date, tz)); + interp_set_entry(table, 4, show_date(date, tz, 1)); +} + +static long format_commit_message(const struct commit *commit, + const char *msg, char *buf, unsigned long space) +{ + struct interp table[] = { + { "%H" }, /* commit hash */ + { "%h" }, /* abbreviated commit hash */ + { "%T" }, /* tree hash */ + { "%t" }, /* abbreviated tree hash */ + { "%P" }, /* parent hashes */ + { "%p" }, /* abbreviated parent hashes */ + { "%an" }, /* author name */ + { "%ae" }, /* author email */ + { "%ad" }, /* author date */ + { "%aD" }, /* author date, RFC2822 style */ + { "%ar" }, /* author date, relative */ + { "%at" }, /* author date, UNIX timestamp */ + { "%cn" }, /* committer name */ + { "%ce" }, /* committer email */ + { "%cd" }, /* committer date */ + { "%cD" }, /* committer date, RFC2822 style */ + { "%cr" }, /* committer date, relative */ + { "%ct" }, /* committer date, UNIX timestamp */ + { "%e" }, /* encoding */ + { "%s" }, /* subject */ + { "%b" }, /* body */ + { "%Cred" }, /* red */ + { "%Cgreen" }, /* green */ + { "%Cblue" }, /* blue */ + { "%Creset" }, /* reset color */ + { "%n" }, /* newline */ + { "%m" }, /* left/right/bottom */ + }; + enum interp_index { + IHASH = 0, IHASH_ABBREV, + ITREE, ITREE_ABBREV, + IPARENTS, IPARENTS_ABBREV, + IAUTHOR_NAME, IAUTHOR_EMAIL, + IAUTHOR_DATE, IAUTHOR_DATE_RFC2822, IAUTHOR_DATE_RELATIVE, + IAUTHOR_TIMESTAMP, + ICOMMITTER_NAME, ICOMMITTER_EMAIL, + ICOMMITTER_DATE, ICOMMITTER_DATE_RFC2822, + ICOMMITTER_DATE_RELATIVE, ICOMMITTER_TIMESTAMP, + IENCODING, + ISUBJECT, + IBODY, + IRED, IGREEN, IBLUE, IRESET_COLOR, + INEWLINE, + ILEFT_RIGHT, + }; + struct commit_list *p; + char parents[1024]; + int i; + enum { HEADER, SUBJECT, BODY } state; + + if (ILEFT_RIGHT + 1 != ARRAY_SIZE(table)) + die("invalid interp table!"); + + /* these are independent of the commit */ + interp_set_entry(table, IRED, "\033[31m"); + interp_set_entry(table, IGREEN, "\033[32m"); + interp_set_entry(table, IBLUE, "\033[34m"); + interp_set_entry(table, IRESET_COLOR, "\033[m"); + interp_set_entry(table, INEWLINE, "\n"); + + /* these depend on the commit */ + if (!commit->object.parsed) + parse_object(commit->object.sha1); + interp_set_entry(table, IHASH, sha1_to_hex(commit->object.sha1)); + interp_set_entry(table, IHASH_ABBREV, + find_unique_abbrev(commit->object.sha1, + DEFAULT_ABBREV)); + interp_set_entry(table, ITREE, sha1_to_hex(commit->tree->object.sha1)); + interp_set_entry(table, ITREE_ABBREV, + find_unique_abbrev(commit->tree->object.sha1, + DEFAULT_ABBREV)); + interp_set_entry(table, ILEFT_RIGHT, + (commit->object.flags & BOUNDARY) + ? "-" + : (commit->object.flags & SYMMETRIC_LEFT) + ? "<" + : ">"); + + parents[1] = 0; + for (i = 0, p = commit->parents; + p && i < sizeof(parents) - 1; + p = p->next) + i += snprintf(parents + i, sizeof(parents) - i - 1, " %s", + sha1_to_hex(p->item->object.sha1)); + interp_set_entry(table, IPARENTS, parents + 1); + + parents[1] = 0; + for (i = 0, p = commit->parents; + p && i < sizeof(parents) - 1; + p = p->next) + i += snprintf(parents + i, sizeof(parents) - i - 1, " %s", + find_unique_abbrev(p->item->object.sha1, + DEFAULT_ABBREV)); + interp_set_entry(table, IPARENTS_ABBREV, parents + 1); + + for (i = 0, state = HEADER; msg[i] && state < BODY; i++) { + int eol; + for (eol = i; msg[eol] && msg[eol] != '\n'; eol++) + ; /* do nothing */ + + if (state == SUBJECT) { + table[ISUBJECT].value = xstrndup(msg + i, eol - i); + i = eol; + } + if (i == eol) { + state++; + /* strip empty lines */ + while (msg[eol + 1] == '\n') + eol++; + } else if (!prefixcmp(msg + i, "author ")) + fill_person(table + IAUTHOR_NAME, + msg + i + 7, eol - i - 7); + else if (!prefixcmp(msg + i, "committer ")) + fill_person(table + ICOMMITTER_NAME, + msg + i + 10, eol - i - 10); + else if (!prefixcmp(msg + i, "encoding ")) + table[IENCODING].value = + xstrndup(msg + i + 9, eol - i - 9); + i = eol; + } + if (msg[i]) + table[IBODY].value = xstrdup(msg + i); + for (i = 0; i < ARRAY_SIZE(table); i++) + if (!table[i].value) + interp_set_entry(table, i, "<unknown>"); + + interpolate(buf, space, user_format, table, ARRAY_SIZE(table)); + interp_clear_table(table, ARRAY_SIZE(table)); + + return strlen(buf); +} + +unsigned long pretty_print_commit(enum cmit_fmt fmt, + const struct commit *commit, + unsigned long len, + char *buf, unsigned long space, + int abbrev, const char *subject, + const char *after_subject, + enum date_mode dmode) +{ + int hdr = 1, body = 0, seen_title = 0; + unsigned long offset = 0; + int indent = 4; + int parents_shown = 0; + const char *msg = commit->buffer; + int plain_non_ascii = 0; + char *reencoded; + const char *encoding; + + if (fmt == CMIT_FMT_USERFORMAT) + return format_commit_message(commit, msg, buf, space); + + encoding = (git_log_output_encoding + ? git_log_output_encoding + : git_commit_encoding); + if (!encoding) + encoding = "utf-8"; + reencoded = logmsg_reencode(commit, encoding); + if (reencoded) + msg = reencoded; + + if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL) + indent = 0; + + /* After-subject is used to pass in Content-Type: multipart + * MIME header; in that case we do not have to do the + * plaintext content type even if the commit message has + * non 7-bit ASCII character. Otherwise, check if we need + * to say this is not a 7-bit ASCII. + */ + if (fmt == CMIT_FMT_EMAIL && !after_subject) { + int i, ch, in_body; + + for (in_body = i = 0; (ch = msg[i]) && i < len; i++) { + if (!in_body) { + /* author could be non 7-bit ASCII but + * the log may be so; skip over the + * header part first. + */ + if (ch == '\n' && + i + 1 < len && msg[i+1] == '\n') + in_body = 1; + } + else if (non_ascii(ch)) { + plain_non_ascii = 1; + break; + } + } + } + + for (;;) { + const char *line = msg; + int linelen = get_one_line(msg, len); + + if (!linelen) + break; + + /* + * We want some slop for indentation and a possible + * final "...". Thus the "+ 20". + */ + if (offset + linelen + 20 > space) { + memcpy(buf + offset, " ...\n", 8); + offset += 8; + break; + } + + msg += linelen; + len -= linelen; + if (hdr) { + if (linelen == 1) { + hdr = 0; + if ((fmt != CMIT_FMT_ONELINE) && !subject) + buf[offset++] = '\n'; + continue; + } + if (fmt == CMIT_FMT_RAW) { + memcpy(buf + offset, line, linelen); + offset += linelen; + continue; + } + if (!memcmp(line, "parent ", 7)) { + if (linelen != 48) + die("bad parent line in commit"); + continue; + } + + if (!parents_shown) { + offset += add_merge_info(fmt, buf + offset, + commit, abbrev); + parents_shown = 1; + continue; + } + /* + * MEDIUM == DEFAULT shows only author with dates. + * FULL shows both authors but not dates. + * FULLER shows both authors and dates. + */ + if (!memcmp(line, "author ", 7)) + offset += add_user_info("Author", fmt, + buf + offset, + line + 7, + dmode, + encoding); + if (!memcmp(line, "committer ", 10) && + (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) + offset += add_user_info("Commit", fmt, + buf + offset, + line + 10, + dmode, + encoding); + continue; + } + + if (!subject) + body = 1; + + if (is_empty_line(line, &linelen)) { + if (!seen_title) + continue; + if (!body) + continue; + if (subject) + continue; + if (fmt == CMIT_FMT_SHORT) + break; + } + + seen_title = 1; + if (subject) { + int slen = strlen(subject); + memcpy(buf + offset, subject, slen); + offset += slen; + offset += add_rfc2047(buf + offset, line, linelen, + encoding); + } + else { + memset(buf + offset, ' ', indent); + memcpy(buf + offset + indent, line, linelen); + offset += linelen + indent; + } + buf[offset++] = '\n'; + if (fmt == CMIT_FMT_ONELINE) + break; + if (subject && plain_non_ascii) { + int sz; + char header[512]; + const char *header_fmt = + "MIME-Version: 1.0\n" + "Content-Type: text/plain; charset=%s\n" + "Content-Transfer-Encoding: 8bit\n"; + sz = snprintf(header, sizeof(header), header_fmt, + encoding); + if (sizeof(header) < sz) + die("Encoding name %s too long", encoding); + memcpy(buf + offset, header, sz); + offset += sz; + } + if (after_subject) { + int slen = strlen(after_subject); + if (slen > space - offset - 1) + slen = space - offset - 1; + memcpy(buf + offset, after_subject, slen); + offset += slen; + after_subject = NULL; + } + subject = NULL; + } + while (offset && isspace(buf[offset-1])) + offset--; + /* Make sure there is an EOLN for the non-oneline case */ + if (fmt != CMIT_FMT_ONELINE) + buf[offset++] = '\n'; + /* + * make sure there is another EOLN to separate the headers from whatever + * body the caller appends if we haven't already written a body + */ + if (fmt == CMIT_FMT_EMAIL && !body) + buf[offset++] = '\n'; + buf[offset] = '\0'; + + free(reencoded); + return offset; +} + +struct commit *pop_commit(struct commit_list **stack) +{ + struct commit_list *top = *stack; + struct commit *item = top ? top->item : NULL; + + if (top) { + *stack = top->next; + free(top); + } + return item; +} + +int count_parents(struct commit * commit) +{ + int count; + struct commit_list * parents = commit->parents; + for (count = 0; parents; parents = parents->next,count++) + ; + return count; +} + +void topo_sort_default_setter(struct commit *c, void *data) +{ + c->util = data; +} + +void *topo_sort_default_getter(struct commit *c) +{ + return c->util; +} + +/* + * Performs an in-place topological sort on the list supplied. + */ +void sort_in_topological_order(struct commit_list ** list, int lifo) +{ + sort_in_topological_order_fn(list, lifo, topo_sort_default_setter, + topo_sort_default_getter); +} + +void sort_in_topological_order_fn(struct commit_list ** list, int lifo, + topo_sort_set_fn_t setter, + topo_sort_get_fn_t getter) +{ + struct commit_list * next = *list; + struct commit_list * work = NULL, **insert; + struct commit_list ** pptr = list; + struct sort_node * nodes; + struct sort_node * next_nodes; + int count = 0; + + /* determine the size of the list */ + while (next) { + next = next->next; + count++; + } + + if (!count) + return; + /* allocate an array to help sort the list */ + nodes = xcalloc(count, sizeof(*nodes)); + /* link the list to the array */ + next_nodes = nodes; + next=*list; + while (next) { + next_nodes->list_item = next; + setter(next->item, next_nodes); + next_nodes++; + next = next->next; + } + /* update the indegree */ + next=*list; + while (next) { + struct commit_list * parents = next->item->parents; + while (parents) { + struct commit * parent=parents->item; + struct sort_node * pn = (struct sort_node *) getter(parent); + + if (pn) + pn->indegree++; + parents=parents->next; + } + next=next->next; + } + /* + * find the tips + * + * tips are nodes not reachable from any other node in the list + * + * the tips serve as a starting set for the work queue. + */ + next=*list; + insert = &work; + while (next) { + struct sort_node * node = (struct sort_node *) getter(next->item); + + if (node->indegree == 0) { + insert = &commit_list_insert(next->item, insert)->next; + } + next=next->next; + } + + /* process the list in topological order */ + if (!lifo) + sort_by_date(&work); + while (work) { + struct commit * work_item = pop_commit(&work); + struct sort_node * work_node = (struct sort_node *) getter(work_item); + struct commit_list * parents = work_item->parents; + + while (parents) { + struct commit * parent=parents->item; + struct sort_node * pn = (struct sort_node *) getter(parent); + + if (pn) { + /* + * parents are only enqueued for emission + * when all their children have been emitted thereby + * guaranteeing topological order. + */ + pn->indegree--; + if (!pn->indegree) { + if (!lifo) + insert_by_date(parent, &work); + else + commit_list_insert(parent, &work); + } + } + parents=parents->next; + } + /* + * work_item is a commit all of whose children + * have already been emitted. we can emit it now. + */ + *pptr = work_node->list_item; + pptr = &(*pptr)->next; + *pptr = NULL; + setter(work_item, NULL); + } + free(nodes); +} + +/* merge-base stuff */ + +/* bits #0..15 in revision.h */ +#define PARENT1 (1u<<16) +#define PARENT2 (1u<<17) +#define STALE (1u<<18) +#define RESULT (1u<<19) + +static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT); + +static struct commit *interesting(struct commit_list *list) +{ + while (list) { + struct commit *commit = list->item; + list = list->next; + if (commit->object.flags & STALE) + continue; + return commit; + } + return NULL; +} + +static struct commit_list *merge_bases(struct commit *one, struct commit *two) +{ + struct commit_list *list = NULL; + struct commit_list *result = NULL; + + if (one == two) + /* We do not mark this even with RESULT so we do not + * have to clean it up. + */ + return commit_list_insert(one, &result); + + parse_commit(one); + parse_commit(two); + + one->object.flags |= PARENT1; + two->object.flags |= PARENT2; + insert_by_date(one, &list); + insert_by_date(two, &list); + + while (interesting(list)) { + struct commit *commit; + struct commit_list *parents; + struct commit_list *n; + int flags; + + commit = list->item; + n = list->next; + free(list); + list = n; + + flags = commit->object.flags & (PARENT1 | PARENT2 | STALE); + if (flags == (PARENT1 | PARENT2)) { + if (!(commit->object.flags & RESULT)) { + commit->object.flags |= RESULT; + insert_by_date(commit, &result); + } + /* Mark parents of a found merge stale */ + flags |= STALE; + } + parents = commit->parents; + while (parents) { + struct commit *p = parents->item; + parents = parents->next; + if ((p->object.flags & flags) == flags) + continue; + parse_commit(p); + p->object.flags |= flags; + insert_by_date(p, &list); + } + } + + /* Clean up the result to remove stale ones */ + free_commit_list(list); + list = result; result = NULL; + while (list) { + struct commit_list *n = list->next; + if (!(list->item->object.flags & STALE)) + insert_by_date(list->item, &result); + free(list); + list = n; + } + return result; +} + +struct commit_list *get_merge_bases(struct commit *one, + struct commit *two, + int cleanup) +{ + struct commit_list *list; + struct commit **rslt; + struct commit_list *result; + int cnt, i, j; + + result = merge_bases(one, two); + if (one == two) + return result; + if (!result || !result->next) { + if (cleanup) { + clear_commit_marks(one, all_flags); + clear_commit_marks(two, all_flags); + } + return result; + } + + /* There are more than one */ + cnt = 0; + list = result; + while (list) { + list = list->next; + cnt++; + } + rslt = xcalloc(cnt, sizeof(*rslt)); + for (list = result, i = 0; list; list = list->next) + rslt[i++] = list->item; + free_commit_list(result); + + clear_commit_marks(one, all_flags); + clear_commit_marks(two, all_flags); + for (i = 0; i < cnt - 1; i++) { + for (j = i+1; j < cnt; j++) { + if (!rslt[i] || !rslt[j]) + continue; + result = merge_bases(rslt[i], rslt[j]); + clear_commit_marks(rslt[i], all_flags); + clear_commit_marks(rslt[j], all_flags); + for (list = result; list; list = list->next) { + if (rslt[i] == list->item) + rslt[i] = NULL; + if (rslt[j] == list->item) + rslt[j] = NULL; + } + } + } + + /* Surviving ones in rslt[] are the independent results */ + result = NULL; + for (i = 0; i < cnt; i++) { + if (rslt[i]) + insert_by_date(rslt[i], &result); + } + free(rslt); + return result; +} + +int in_merge_bases(struct commit *commit, struct commit **reference, int num) +{ + struct commit_list *bases, *b; + int ret = 0; + + if (num == 1) + bases = get_merge_bases(commit, *reference, 1); + else + die("not yet"); + for (b = bases; b; b = b->next) { + if (!hashcmp(commit->object.sha1, b->item->object.sha1)) { + ret = 1; + break; + } + } + + free_commit_list(bases); + return ret; +} |