Andrew's git - gitweb.git/blob

   1#define _XOPEN_SOURCE /* glibc2 needs this */
   2#define _BSD_SOURCE /* for tm.tm_gmtoff */
   3#include <time.h>
   4#include <ctype.h>
   5
   6#include "cache.h"
   7#include "revision.h"
   8
   9/*
  10 * revision.h leaves the low 16 bits of the "flags" field of the
  11 * revision data structure unused. We use it for a "reachable from
  12 * this commit <N>" bitmask.
  13 */
  14#define MAX_COMMITS 16
  15
  16static int show_edges = 0;
  17static int basemask = 0;
  18
  19static void read_cache_file(const char *path)
  20{
  21        FILE *file = fopen(path, "r");
  22        char line[500];
  23
  24        if (!file)
  25                die("bad revtree cache file (%s)", path);
  26
  27        while (fgets(line, sizeof(line), file)) {
  28                unsigned long date;
  29                unsigned char sha1[20];
  30                struct revision *rev;
  31                const char *buf;
  32
  33                if (sscanf(line, "%lu", &date) != 1)
  34                        break;
  35                buf = strchr(line, ' ');
  36                if (!buf)
  37                        break;
  38                if (get_sha1_hex(buf+1, sha1))
  39                        break;
  40                rev = lookup_rev(sha1);
  41                rev->flags |= SEEN;
  42                rev->date = date;
  43
  44                /* parents? */
  45                while ((buf = strchr(buf+1, ' ')) != NULL) {
  46                        unsigned char parent[20];
  47                        if (get_sha1_hex(buf + 1, parent))
  48                                break;
  49                        add_relationship(rev, parent);
  50                }
  51        }
  52        fclose(file);
  53}
  54
  55static void mark_sha1_path(struct revision *rev, unsigned int mask)
  56{
  57        struct parent *p;
  58
  59        if (rev->flags & mask)
  60                return;
  61
  62        rev->flags |= mask;
  63        p = rev->parent;
  64        while (p) {
  65                mark_sha1_path(p->parent, mask);
  66                p = p->next;
  67        }
  68}
  69
  70/*
  71 * Some revisions are less interesting than others.
  72 *
  73 * For example, if we use a cache-file, that one may contain
  74 * revisions that were never used. They are never interesting.
  75 *
  76 * And sometimes we're only interested in "edge" commits, ie
  77 * places where the marking changes between parent and child.
  78 */
  79static int interesting(struct revision *rev)
  80{
  81        unsigned mask = marked(rev);
  82
  83        if (!mask)
  84                return 0;
  85        if (show_edges) {
  86                struct parent *p = rev->parent;
  87                while (p) {
  88                        if (mask != marked(p->parent))
  89                                return 1;
  90                        p = p->next;
  91                }
  92                return 0;
  93        }
  94        if (mask & basemask)
  95                return 0;
  96
  97        return 1;
  98}
  99
 100/*
 101 * Usage: rev-tree [--edges] [--cache <cache-file>] <commit-id> [<commit-id2>]
 102 *
 103 * The cache-file can be quite important for big trees. This is an
 104 * expensive operation if you have to walk the whole chain of
 105 * parents in a tree with a long revision history.
 106 */
 107int main(int argc, char **argv)
 108{
 109        int i;
 110        int nr = 0;
 111        unsigned char sha1[MAX_COMMITS][20];
 112
 113        /*
 114         * First - pick up all the revisions we can (both from
 115         * caches and from commit file chains).
 116         */
 117        for (i = 1; i < argc ; i++) {
 118                char *arg = argv[i];
 119
 120                if (!strcmp(arg, "--cache")) {
 121                        read_cache_file(argv[2]);
 122                        i++;
 123                        continue;
 124                }
 125
 126                if (!strcmp(arg, "--edges")) {
 127                        show_edges = 1;
 128                        continue;
 129                }
 130
 131                if (arg[0] == '^') {
 132                        arg++;
 133                        basemask |= 1<<nr;
 134                }
 135                if (nr >= MAX_COMMITS || get_sha1_hex(arg, sha1[nr]))
 136                        usage("rev-tree [--edges] [--cache <cache-file>] <commit-id> [<commit-id>]");
 137                parse_commit(sha1[nr]);
 138                nr++;
 139        }
 140
 141        /*
 142         * Now we have the maximal tree. Walk the different sha files back to the root.
 143         */
 144        for (i = 0; i < nr; i++)
 145                mark_sha1_path(lookup_rev(sha1[i]), 1 << i);
 146
 147        /*
 148         * Now print out the results..
 149         */
 150        for (i = 0; i < nr_revs; i++) {
 151                struct revision *rev = revs[i];
 152                struct parent *p;
 153
 154                if (!interesting(rev))
 155                        continue;
 156
 157                printf("%lu %s:%d", rev->date, sha1_to_hex(rev->sha1), marked(rev));
 158                p = rev->parent;
 159                while (p) {
 160                        printf(" %s:%d", sha1_to_hex(p->parent->sha1), marked(p->parent));
 161                        p = p->next;
 162                }
 163                printf("\n");
 164        }
 165        return 0;
 166}