Andrew's git - gitweb.git/blob

   1#include "tag.h"
   2#include "commit.h"
   3#include "cache.h"
   4#include <string.h>
   5#include <limits.h>
   6
   7const char *commit_type = "commit";
   8
   9static struct commit *check_commit(struct object *obj, unsigned char *sha1)
  10{
  11        if (obj->type != commit_type) {
  12                error("Object %s is a %s, not a commit", 
  13                      sha1_to_hex(sha1), obj->type);
  14                return NULL;
  15        }
  16        return (struct commit *) obj;
  17}
  18
  19struct commit *lookup_commit_reference(unsigned char *sha1)
  20{
  21        struct object *obj = parse_object(sha1);
  22
  23        if (!obj)
  24                return NULL;
  25        if (obj->type == tag_type)
  26                obj = ((struct tag *)obj)->tagged;
  27        return check_commit(obj, sha1);
  28}
  29
  30struct commit *lookup_commit(unsigned char *sha1)
  31{
  32        struct object *obj = lookup_object(sha1);
  33        if (!obj) {
  34                struct commit *ret = xmalloc(sizeof(struct commit));
  35                memset(ret, 0, sizeof(struct commit));
  36                created_object(sha1, &ret->object);
  37                ret->object.type = commit_type;
  38                return ret;
  39        }
  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        free(buffer);
 107        return ret;
 108}
 109
 110void commit_list_insert(struct commit *item, struct commit_list **list_p)
 111{
 112        struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
 113        new_list->item = item;
 114        new_list->next = *list_p;
 115        *list_p = new_list;
 116}
 117
 118void free_commit_list(struct commit_list *list)
 119{
 120        while (list) {
 121                struct commit_list *temp = list;
 122                list = temp->next;
 123                free(temp);
 124        }
 125}
 126
 127static void insert_by_date(struct commit_list **list, struct commit *item)
 128{
 129        struct commit_list **pp = list;
 130        struct commit_list *p;
 131        while ((p = *pp) != NULL) {
 132                if (p->item->date < item->date) {
 133                        break;
 134                }
 135                pp = &p->next;
 136        }
 137        commit_list_insert(item, pp);
 138}
 139
 140        
 141void sort_by_date(struct commit_list **list)
 142{
 143        struct commit_list *ret = NULL;
 144        while (*list) {
 145                insert_by_date(&ret, (*list)->item);
 146                *list = (*list)->next;
 147        }
 148        *list = ret;
 149}
 150
 151struct commit *pop_most_recent_commit(struct commit_list **list,
 152                                      unsigned int mark)
 153{
 154        struct commit *ret = (*list)->item;
 155        struct commit_list *parents = ret->parents;
 156        struct commit_list *old = *list;
 157
 158        *list = (*list)->next;
 159        free(old);
 160
 161        while (parents) {
 162                struct commit *commit = parents->item;
 163                parse_commit(commit);
 164                if (!(commit->object.flags & mark)) {
 165                        commit->object.flags |= mark;
 166                        insert_by_date(list, commit);
 167                }
 168                parents = parents->next;
 169        }
 170        return ret;
 171}