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-rw-r--r--commit.c831
1 files changed, 831 insertions, 0 deletions
diff --git a/commit.c b/commit.c
new file mode 100644
index 0000000000..94f470b75c
--- /dev/null
+++ b/commit.c
@@ -0,0 +1,831 @@
+#include "cache.h"
+#include "tag.h"
+#include "commit.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 },
+};
+
+enum cmit_fmt get_commit_format(const char *arg)
+{
+ int i;
+
+ if (!arg || !*arg)
+ return CMIT_FMT_DEFAULT;
+ if (*arg == '=')
+ arg++;
+ for (i = 0; i < ARRAY_SIZE(cmt_fmts); i++) {
+ if (!strncmp(arg, cmt_fmts[i].n, cmt_fmts[i].cmp_len))
+ 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 != commit_type) {
+ if (!quiet)
+ error("Object %s is a %s, not a commit",
+ sha1_to_hex(sha1), 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) {
+ struct commit *ret = xcalloc(1, sizeof(struct commit));
+ created_object(sha1, &ret->object);
+ ret->object.type = commit_type;
+ return ret;
+ }
+ if (!obj->type)
+ obj->type = commit_type;
+ 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 = memcmp(sha1, graft->sha1, 20);
+ 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);
+ 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 parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
+{
+ 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;
+ if (memcmp(bufptr, "tree ", 5))
+ return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
+ if (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 (!memcmp(bufptr, "parent ", 7)) {
+ struct commit *new_parent;
+
+ if (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)
+{
+ char type[20];
+ 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 (strcmp(type, commit_type)) {
+ 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;
+
+ parents = commit->parents;
+ commit->object.flags &= ~mark;
+ while (parents) {
+ struct commit *parent = parents->item;
+ if (parent && parent->object.parsed &&
+ (parent->object.flags & mark))
+ 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;
+}
+
+static int is_rfc2047_special(char ch)
+{
+ return ((ch & 0x80) || (ch == '=') || (ch == '?') || (ch == '_'));
+}
+
+static int add_rfc2047(char *buf, const char *line, int len)
+{
+ char *bp = buf;
+ int i, needquote;
+ static const char q_utf8[] = "=?utf-8?q?";
+
+ for (i = needquote = 0; !needquote && i < len; i++) {
+ unsigned ch = line[i];
+ if (ch & 0x80)
+ needquote++;
+ if ((i + 1 < len) &&
+ (ch == '=' && line[i+1] == '?'))
+ needquote++;
+ }
+ if (!needquote)
+ return sprintf(buf, "%.*s", len, line);
+
+ memcpy(bp, q_utf8, sizeof(q_utf8)-1);
+ bp += sizeof(q_utf8)-1;
+ for (i = 0; i < len; i++) {
+ unsigned ch = line[i];
+ if (is_rfc2047_special(ch)) {
+ sprintf(bp, "=%02X", ch);
+ bp += 3;
+ }
+ else if (ch == ' ')
+ *bp++ = '_';
+ 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)
+{
+ 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);
+ 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));
+ 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));
+ 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 = abbrev
+ ? find_unique_abbrev(p->object.sha1, abbrev)
+ : sha1_to_hex(p->object.sha1);
+ char *dots = (abbrev && strlen(hex) != 40) ? "..." : "";
+ parent = parent->next;
+
+ offset += sprintf(buf + offset, " %s%s", hex, dots);
+ }
+ buf[offset++] = '\n';
+ return offset;
+}
+
+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)
+{
+ int hdr = 1, body = 0;
+ unsigned long offset = 0;
+ int indent = 4;
+ int parents_shown = 0;
+ const char *msg = commit->buffer;
+ int plain_non_ascii = 0;
+
+ 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;
+ for (i = 0; !plain_non_ascii && msg[i] && i < len; i++)
+ if (msg[i] & 0x80)
+ plain_non_ascii = 1;
+ }
+
+ 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);
+ if (!memcmp(line, "committer ", 10) &&
+ (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER))
+ offset += add_user_info("Commit", fmt,
+ buf + offset,
+ line + 10);
+ continue;
+ }
+
+ if (is_empty_line(line, &linelen)) {
+ if (!body)
+ continue;
+ if (subject)
+ continue;
+ if (fmt == CMIT_FMT_SHORT)
+ break;
+ } else {
+ body = 1;
+ }
+
+ if (subject) {
+ int slen = strlen(subject);
+ memcpy(buf + offset, subject, slen);
+ offset += slen;
+ offset += add_rfc2047(buf + offset, line, linelen);
+ }
+ 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) {
+ static const char header[] =
+ "Content-Type: text/plain; charset=UTF-8\n"
+ "Content-Transfer-Encoding: 8bit\n";
+ memcpy(buf + offset, header, sizeof(header)-1);
+ offset += sizeof(header)-1;
+ }
+ 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';
+ buf[offset] = '\0';
+ 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 = 0;
+ 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->object.util = data;
+}
+
+void *topo_sort_default_getter(struct commit *c)
+{
+ return c->object.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);
+}
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-05-17 21:11:24 +0000