Andrew's git - gitweb.git/blob

   1#include <ctype.h>
   2#include "tag.h"
   3#include "commit.h"
   4#include "cache.h"
   5
   6const char *commit_type = "commit";
   7
   8enum cmit_fmt get_commit_format(const char *arg)
   9{
  10        if (!*arg)
  11                return CMIT_FMT_DEFAULT;
  12        if (!strcmp(arg, "=raw"))
  13                return CMIT_FMT_RAW;
  14        if (!strcmp(arg, "=medium"))
  15                return CMIT_FMT_MEDIUM;
  16        if (!strcmp(arg, "=short"))
  17                return CMIT_FMT_SHORT;
  18        if (!strcmp(arg, "=full"))
  19                return CMIT_FMT_FULL;
  20        die("invalid --pretty format");
  21}
  22
  23static struct commit *check_commit(struct object *obj, const unsigned char *sha1)
  24{
  25        if (obj->type != commit_type) {
  26                error("Object %s is a %s, not a commit", 
  27                      sha1_to_hex(sha1), obj->type);
  28                return NULL;
  29        }
  30        return (struct commit *) obj;
  31}
  32
  33struct commit *lookup_commit_reference(const unsigned char *sha1)
  34{
  35        struct object *obj = parse_object(sha1);
  36
  37        if (!obj)
  38                return NULL;
  39        if (obj->type == tag_type)
  40                obj = ((struct tag *)obj)->tagged;
  41        return check_commit(obj, sha1);
  42}
  43
  44struct commit *lookup_commit(const unsigned char *sha1)
  45{
  46        struct object *obj = lookup_object(sha1);
  47        if (!obj) {
  48                struct commit *ret = xmalloc(sizeof(struct commit));
  49                memset(ret, 0, sizeof(struct commit));
  50                created_object(sha1, &ret->object);
  51                ret->object.type = commit_type;
  52                return ret;
  53        }
  54        if (!obj->type)
  55                obj->type = commit_type;
  56        return check_commit(obj, sha1);
  57}
  58
  59static unsigned long parse_commit_date(const char *buf)
  60{
  61        unsigned long date;
  62
  63        if (memcmp(buf, "author", 6))
  64                return 0;
  65        while (*buf++ != '\n')
  66                /* nada */;
  67        if (memcmp(buf, "committer", 9))
  68                return 0;
  69        while (*buf++ != '>')
  70                /* nada */;
  71        date = strtoul(buf, NULL, 10);
  72        if (date == ULONG_MAX)
  73                date = 0;
  74        return date;
  75}
  76
  77int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
  78{
  79        void *bufptr = buffer;
  80        unsigned char parent[20];
  81        struct commit_list **pptr;
  82
  83        if (item->object.parsed)
  84                return 0;
  85        item->object.parsed = 1;
  86        get_sha1_hex(bufptr + 5, parent);
  87        item->tree = lookup_tree(parent);
  88        if (item->tree)
  89                add_ref(&item->object, &item->tree->object);
  90        bufptr += 46; /* "tree " + "hex sha1" + "\n" */
  91        pptr = &item->parents;
  92        while (!memcmp(bufptr, "parent ", 7) &&
  93               !get_sha1_hex(bufptr + 7, parent)) {
  94                struct commit *new_parent = lookup_commit(parent);
  95                if (new_parent) {
  96                        pptr = &commit_list_insert(new_parent, pptr)->next;
  97                        add_ref(&item->object, &new_parent->object);
  98                }
  99                bufptr += 48;
 100        }
 101        item->date = parse_commit_date(bufptr);
 102        return 0;
 103}
 104
 105int parse_commit(struct commit *item)
 106{
 107        char type[20];
 108        void *buffer;
 109        unsigned long size;
 110        int ret;
 111
 112        if (item->object.parsed)
 113                return 0;
 114        buffer = read_sha1_file(item->object.sha1, type, &size);
 115        if (!buffer)
 116                return error("Could not read %s",
 117                             sha1_to_hex(item->object.sha1));
 118        if (strcmp(type, commit_type)) {
 119                free(buffer);
 120                return error("Object %s not a commit",
 121                             sha1_to_hex(item->object.sha1));
 122        }
 123        ret = parse_commit_buffer(item, buffer, size);
 124        if (!ret) {
 125                item->buffer = buffer;
 126                return 0;
 127        }
 128        free(buffer);
 129        return ret;
 130}
 131
 132struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
 133{
 134        struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
 135        new_list->item = item;
 136        new_list->next = *list_p;
 137        *list_p = new_list;
 138        return new_list;
 139}
 140
 141void free_commit_list(struct commit_list *list)
 142{
 143        while (list) {
 144                struct commit_list *temp = list;
 145                list = temp->next;
 146                free(temp);
 147        }
 148}
 149
 150void insert_by_date(struct commit_list **list, struct commit *item)
 151{
 152        struct commit_list **pp = list;
 153        struct commit_list *p;
 154        while ((p = *pp) != NULL) {
 155                if (p->item->date < item->date) {
 156                        break;
 157                }
 158                pp = &p->next;
 159        }
 160        commit_list_insert(item, pp);
 161}
 162
 163        
 164void sort_by_date(struct commit_list **list)
 165{
 166        struct commit_list *ret = NULL;
 167        while (*list) {
 168                insert_by_date(&ret, (*list)->item);
 169                *list = (*list)->next;
 170        }
 171        *list = ret;
 172}
 173
 174struct commit *pop_most_recent_commit(struct commit_list **list,
 175                                      unsigned int mark)
 176{
 177        struct commit *ret = (*list)->item;
 178        struct commit_list *parents = ret->parents;
 179        struct commit_list *old = *list;
 180
 181        *list = (*list)->next;
 182        free(old);
 183
 184        while (parents) {
 185                struct commit *commit = parents->item;
 186                parse_commit(commit);
 187                if (!(commit->object.flags & mark)) {
 188                        commit->object.flags |= mark;
 189                        insert_by_date(list, commit);
 190                }
 191                parents = parents->next;
 192        }
 193        return ret;
 194}
 195
 196/*
 197 * Generic support for pretty-printing the header
 198 */
 199static int get_one_line(const char *msg, unsigned long len)
 200{
 201        int ret = 0;
 202
 203        while (len--) {
 204                char c = *msg++;
 205                ret++;
 206                if (c == '\n')
 207                        break;
 208                if (!c)
 209                        return 0;
 210        }
 211        return ret;
 212}
 213
 214static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf, const char *line)
 215{
 216        char *date;
 217        unsigned int namelen;
 218        unsigned long time;
 219        int tz, ret;
 220
 221        date = strchr(line, '>');
 222        if (!date)
 223                return 0;
 224        namelen = ++date - line;
 225        time = strtoul(date, &date, 10);
 226        tz = strtol(date, NULL, 10);
 227
 228        ret = sprintf(buf, "%s: %.*s\n", what, namelen, line);
 229        if (fmt == CMIT_FMT_MEDIUM)
 230                ret += sprintf(buf + ret, "Date:   %s\n", show_date(time, tz));
 231        return ret;
 232}
 233
 234static int is_empty_line(const char *line, int len)
 235{
 236        while (len && isspace(line[len-1]))
 237                len--;
 238        return !len;
 239}
 240
 241static int add_parent_info(enum cmit_fmt fmt, char *buf, const char *line, int parents)
 242{
 243        int offset = 0;
 244        switch (parents) {
 245        case 1:
 246                break;
 247        case 2:
 248                /* Go back to the previous line: 40 characters of previous parent, and one '\n' */
 249                offset = sprintf(buf, "Merge: %.40s\n", line-41);
 250                /* Fallthrough */
 251        default:
 252                /* Replace the previous '\n' with a space */
 253                buf[offset-1] = ' ';
 254                offset += sprintf(buf + offset, "%.40s\n", line+7);
 255        }
 256        return offset;
 257}
 258
 259unsigned long pretty_print_commit(enum cmit_fmt fmt, const char *msg, unsigned long len, char *buf, unsigned long space)
 260{
 261        int hdr = 1, body = 0;
 262        unsigned long offset = 0;
 263        int parents = 0;
 264
 265        for (;;) {
 266                const char *line = msg;
 267                int linelen = get_one_line(msg, len);
 268
 269                if (!linelen)
 270                        break;
 271
 272                /*
 273                 * We want some slop for indentation and a possible
 274                 * final "...". Thus the "+ 20".
 275                 */
 276                if (offset + linelen + 20 > space) {
 277                        memcpy(buf + offset, "    ...\n", 8);
 278                        offset += 8;
 279                        break;
 280                }
 281
 282                msg += linelen;
 283                len -= linelen;
 284                if (hdr) {
 285                        if (linelen == 1) {
 286                                hdr = 0;
 287                                buf[offset++] = '\n';
 288                                continue;
 289                        }
 290                        if (fmt == CMIT_FMT_RAW) {
 291                                memcpy(buf + offset, line, linelen);
 292                                offset += linelen;
 293                                continue;
 294                        }
 295                        if (!memcmp(line, "parent ", 7)) {
 296                                if (linelen != 48)
 297                                        die("bad parent line in commit");
 298                                offset += add_parent_info(fmt, buf + offset, line, ++parents);
 299                        }
 300                        if (!memcmp(line, "author ", 7))
 301                                offset += add_user_info("Author", fmt, buf + offset, line + 7);
 302                        if (fmt == CMIT_FMT_FULL) {
 303                                if (!memcmp(line, "committer ", 10))
 304                                        offset += add_user_info("Commit", fmt, buf + offset, line + 10);
 305                        }
 306                        continue;
 307                }
 308
 309                if (is_empty_line(line, linelen)) {
 310                        if (!body)
 311                                continue;
 312                        if (fmt == CMIT_FMT_SHORT)
 313                                break;
 314                } else {
 315                        body = 1;
 316                }
 317                memset(buf + offset, ' ', 4);
 318                memcpy(buf + offset + 4, line, linelen);
 319                offset += linelen + 4;
 320        }
 321        /* Make sure there is an EOLN */
 322        if (buf[offset - 1] != '\n')
 323                buf[offset++] = '\n';
 324        buf[offset] = '\0';
 325        return offset;
 326}
 327
 328struct commit *pop_commit(struct commit_list **stack)
 329{
 330        struct commit_list *top = *stack;
 331        struct commit *item = top ? top->item : NULL;
 332
 333        if (top) {
 334                *stack = top->next;
 335                free(top);
 336        }
 337        return item;
 338}
 339
 340int count_parents(struct commit * commit)
 341{
 342        int count = 0;
 343        struct commit_list * parents = commit->parents;
 344        for (count=0;parents; parents=parents->next,count++)
 345          ;
 346        return count;
 347}
 348