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#include "tag.h"
#include "commit.h"
#include "cache.h"
const char *commit_type = "commit";
static struct commit *check_commit(struct object *obj, unsigned char *sha1)
{
if (obj->type != commit_type) {
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(unsigned char *sha1)
{
struct object *obj = parse_object(sha1);
if (!obj)
return NULL;
if (obj->type == tag_type)
obj = ((struct tag *)obj)->tagged;
return check_commit(obj, sha1);
}
struct commit *lookup_commit(unsigned char *sha1)
{
struct object *obj = lookup_object(sha1);
if (!obj) {
struct commit *ret = xmalloc(sizeof(struct commit));
memset(ret, 0, 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);
}
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;
}
int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
{
void *bufptr = buffer;
unsigned char parent[20];
if (item->object.parsed)
return 0;
item->object.parsed = 1;
get_sha1_hex(bufptr + 5, parent);
item->tree = lookup_tree(parent);
if (item->tree)
add_ref(&item->object, &item->tree->object);
bufptr += 46; /* "tree " + "hex sha1" + "\n" */
while (!memcmp(bufptr, "parent ", 7) &&
!get_sha1_hex(bufptr + 7, parent)) {
struct commit *new_parent = lookup_commit(parent);
if (new_parent) {
commit_list_insert(new_parent, &item->parents);
add_ref(&item->object, &new_parent->object);
}
bufptr += 48;
}
item->date = parse_commit_date(bufptr);
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 (!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);
}
}
static void insert_by_date(struct commit_list **list, struct commit *item)
{
struct commit_list **pp = list;
struct commit_list *p;
while ((p = *pp) != NULL) {
if (p->item->date < item->date) {
break;
}
pp = &p->next;
}
commit_list_insert(item, pp);
}
void sort_by_date(struct commit_list **list)
{
struct commit_list *ret = NULL;
while (*list) {
insert_by_date(&ret, (*list)->item);
*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(list, commit);
}
parents = parents->next;
}
return ret;
}
/*
* 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++;
ret++;
if (c == '\n')
break;
if (!c)
return 0;
}
return ret;
}
static int add_author_info(char *buf, const char *line, int len)
{
char *date;
unsigned int namelen;
unsigned long time;
int tz;
line += strlen("author ");
date = strchr(line, '>');
if (!date)
return 0;
namelen = ++date - line;
time = strtoul(date, &date, 10);
tz = strtol(date, NULL, 10);
return sprintf(buf, "Author: %.*s\nDate: %s\n",
namelen, line,
show_date(time, tz));
}
unsigned long pretty_print_commit(const char *msg, unsigned long len, char *buf, unsigned long space)
{
int hdr = 1;
unsigned long offset = 0;
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 (linelen == 1)
hdr = 0;
if (hdr) {
if (!memcmp(line, "author ", 7))
offset += add_author_info(buf + offset, line, linelen);
continue;
}
memset(buf + offset, ' ', 4);
memcpy(buf + offset + 4, line, linelen);
offset += linelen + 4;
}
/* Make sure there is an EOLN */
if (buf[offset - 1] != '\n')
buf[offset++] = '\n';
buf[offset] = '\0';
return offset;
}
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