Andrew's git - gitweb.git/blob

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