Andrew's git - gitweb.git/blob

   1#include "tag.h"
   2#include "commit.h"
   3#include "cache.h"
   4
   5const char *commit_type = "commit";
   6
   7static struct commit *check_commit(struct object *obj, unsigned char *sha1)
   8{
   9        if (obj->type != commit_type) {
  10                error("Object %s is a %s, not a commit", 
  11                      sha1_to_hex(sha1), obj->type);
  12                return NULL;
  13        }
  14        return (struct commit *) obj;
  15}
  16
  17struct commit *lookup_commit_reference(unsigned char *sha1)
  18{
  19        struct object *obj = parse_object(sha1);
  20
  21        if (!obj)
  22                return NULL;
  23        if (obj->type == tag_type)
  24                obj = ((struct tag *)obj)->tagged;
  25        return check_commit(obj, sha1);
  26}
  27
  28struct commit *lookup_commit(unsigned char *sha1)
  29{
  30        struct object *obj = lookup_object(sha1);
  31        if (!obj) {
  32                struct commit *ret = xmalloc(sizeof(struct commit));
  33                memset(ret, 0, sizeof(struct commit));
  34                created_object(sha1, &ret->object);
  35                ret->object.type = commit_type;
  36                return ret;
  37        }
  38        if (!obj->type)
  39                obj->type = commit_type;
  40        return check_commit(obj, sha1);
  41}
  42
  43static unsigned long parse_commit_date(const char *buf)
  44{
  45        unsigned long date;
  46
  47        if (memcmp(buf, "author", 6))
  48                return 0;
  49        while (*buf++ != '\n')
  50                /* nada */;
  51        if (memcmp(buf, "committer", 9))
  52                return 0;
  53        while (*buf++ != '>')
  54                /* nada */;
  55        date = strtoul(buf, NULL, 10);
  56        if (date == ULONG_MAX)
  57                date = 0;
  58        return date;
  59}
  60
  61int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
  62{
  63        void *bufptr = buffer;
  64        unsigned char parent[20];
  65
  66        if (item->object.parsed)
  67                return 0;
  68        item->object.parsed = 1;
  69        get_sha1_hex(bufptr + 5, parent);
  70        item->tree = lookup_tree(parent);
  71        if (item->tree)
  72                add_ref(&item->object, &item->tree->object);
  73        bufptr += 46; /* "tree " + "hex sha1" + "\n" */
  74        while (!memcmp(bufptr, "parent ", 7) &&
  75               !get_sha1_hex(bufptr + 7, parent)) {
  76                struct commit *new_parent = lookup_commit(parent);
  77                if (new_parent) {
  78                        commit_list_insert(new_parent, &item->parents);
  79                        add_ref(&item->object, &new_parent->object);
  80                }
  81                bufptr += 48;
  82        }
  83        item->date = parse_commit_date(bufptr);
  84        return 0;
  85}
  86
  87int parse_commit(struct commit *item)
  88{
  89        char type[20];
  90        void *buffer;
  91        unsigned long size;
  92        int ret;
  93
  94        if (item->object.parsed)
  95                return 0;
  96        buffer = read_sha1_file(item->object.sha1, type, &size);
  97        if (!buffer)
  98                return error("Could not read %s",
  99                             sha1_to_hex(item->object.sha1));
 100        if (strcmp(type, commit_type)) {
 101                free(buffer);
 102                return error("Object %s not a commit",
 103                             sha1_to_hex(item->object.sha1));
 104        }
 105        ret = parse_commit_buffer(item, buffer, size);
 106        if (!ret) {
 107                item->buffer = buffer;
 108                return 0;
 109        }
 110        free(buffer);
 111        return ret;
 112}
 113
 114void commit_list_insert(struct commit *item, struct commit_list **list_p)
 115{
 116        struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
 117        new_list->item = item;
 118        new_list->next = *list_p;
 119        *list_p = new_list;
 120}
 121
 122void free_commit_list(struct commit_list *list)
 123{
 124        while (list) {
 125                struct commit_list *temp = list;
 126                list = temp->next;
 127                free(temp);
 128        }
 129}
 130
 131static void insert_by_date(struct commit_list **list, struct commit *item)
 132{
 133        struct commit_list **pp = list;
 134        struct commit_list *p;
 135        while ((p = *pp) != NULL) {
 136                if (p->item->date < item->date) {
 137                        break;
 138                }
 139                pp = &p->next;
 140        }
 141        commit_list_insert(item, pp);
 142}
 143
 144        
 145void sort_by_date(struct commit_list **list)
 146{
 147        struct commit_list *ret = NULL;
 148        while (*list) {
 149                insert_by_date(&ret, (*list)->item);
 150                *list = (*list)->next;
 151        }
 152        *list = ret;
 153}
 154
 155struct commit *pop_most_recent_commit(struct commit_list **list,
 156                                      unsigned int mark)
 157{
 158        struct commit *ret = (*list)->item;
 159        struct commit_list *parents = ret->parents;
 160        struct commit_list *old = *list;
 161
 162        *list = (*list)->next;
 163        free(old);
 164
 165        while (parents) {
 166                struct commit *commit = parents->item;
 167                parse_commit(commit);
 168                if (!(commit->object.flags & mark)) {
 169                        commit->object.flags |= mark;
 170                        insert_by_date(list, commit);
 171                }
 172                parents = parents->next;
 173        }
 174        return ret;
 175}