Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "diff.h"
   3#include "commit.h"
   4#include "log-tree.h"
   5
   6static struct rev_info log_tree_opt;
   7
   8static int diff_tree_commit_sha1(const unsigned char *sha1)
   9{
  10        struct commit *commit = lookup_commit_reference(sha1);
  11        if (!commit)
  12                return -1;
  13        return log_tree_commit(&log_tree_opt, commit);
  14}
  15
  16static int diff_tree_stdin(char *line)
  17{
  18        int len = strlen(line);
  19        unsigned char sha1[20];
  20        struct commit *commit;
  21
  22        if (!len || line[len-1] != '\n')
  23                return -1;
  24        line[len-1] = 0;
  25        if (get_sha1_hex(line, sha1))
  26                return -1;
  27        commit = lookup_commit(sha1);
  28        if (!commit || parse_commit(commit))
  29                return -1;
  30        if (isspace(line[40]) && !get_sha1_hex(line+41, sha1)) {
  31                /* Graft the fake parents locally to the commit */
  32                int pos = 41;
  33                struct commit_list **pptr, *parents;
  34
  35                /* Free the real parent list */
  36                for (parents = commit->parents; parents; ) {
  37                        struct commit_list *tmp = parents->next;
  38                        free(parents);
  39                        parents = tmp;
  40                }
  41                commit->parents = NULL;
  42                pptr = &(commit->parents);
  43                while (line[pos] && !get_sha1_hex(line + pos, sha1)) {
  44                        struct commit *parent = lookup_commit(sha1);
  45                        if (parent) {
  46                                pptr = &commit_list_insert(parent, pptr)->next;
  47                        }
  48                        pos += 41;
  49                }
  50        }
  51        return log_tree_commit(&log_tree_opt, commit);
  52}
  53
  54static const char diff_tree_usage[] =
  55"git-diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
  56"[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
  57"  -r            diff recursively\n"
  58"  --root        include the initial commit as diff against /dev/null\n"
  59COMMON_DIFF_OPTIONS_HELP;
  60
  61int main(int argc, const char **argv)
  62{
  63        int nr_sha1;
  64        char line[1000];
  65        struct object *tree1, *tree2;
  66        static struct rev_info *opt = &log_tree_opt;
  67        struct object_list *list;
  68        int read_stdin = 0;
  69
  70        git_config(git_diff_config);
  71        nr_sha1 = 0;
  72        init_revisions(opt);
  73        opt->abbrev = 0;
  74        opt->diff = 1;
  75        argc = setup_revisions(argc, argv, opt, NULL);
  76
  77        while (--argc > 0) {
  78                const char *arg = *++argv;
  79
  80                if (!strcmp(arg, "--stdin")) {
  81                        read_stdin = 1;
  82                        continue;
  83                }
  84                usage(diff_tree_usage);
  85        }
  86
  87        /*
  88         * NOTE! "setup_revisions()" will have inserted the revisions
  89         * it parsed in reverse order. So if you do
  90         *
  91         *      git-diff-tree a b
  92         *
  93         * the commit list will be "b" -> "a" -> NULL, so we reverse
  94         * the order of the objects if the first one is not marked
  95         * UNINTERESTING.
  96         */
  97        nr_sha1 = 0;
  98        list = opt->pending_objects;
  99        if (list) {
 100                nr_sha1++;
 101                tree1 = list->item;
 102                list = list->next;
 103                if (list) {
 104                        nr_sha1++;
 105                        tree2 = tree1;
 106                        tree1 = list->item;
 107                        if (list->next)
 108                                usage(diff_tree_usage);
 109                        /* Switch them around if the second one was uninteresting.. */
 110                        if (tree2->flags & UNINTERESTING) {
 111                                struct object *tmp = tree2;
 112                                tree2 = tree1;
 113                                tree1 = tmp;
 114                        }
 115                }
 116        }
 117
 118        switch (nr_sha1) {
 119        case 0:
 120                if (!read_stdin)
 121                        usage(diff_tree_usage);
 122                break;
 123        case 1:
 124                diff_tree_commit_sha1(tree1->sha1);
 125                break;
 126        case 2:
 127                diff_tree_sha1(tree1->sha1,
 128                               tree2->sha1,
 129                               "", &opt->diffopt);
 130                log_tree_diff_flush(opt);
 131                break;
 132        }
 133
 134        if (!read_stdin)
 135                return 0;
 136
 137        if (opt->diffopt.detect_rename)
 138                opt->diffopt.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 139                                       DIFF_SETUP_USE_CACHE);
 140        while (fgets(line, sizeof(line), stdin))
 141                if (line[0] == '\n')
 142                        fflush(stdout);
 143                else
 144                        diff_tree_stdin(line);
 145
 146        return 0;
 147}