Andrew's git - gitweb.git/blob - builtin/diff-tree.c

   1#include "cache.h"
   2#include "diff.h"
   3#include "commit.h"
   4#include "log-tree.h"
   5#include "builtin.h"
   6#include "submodule.h"
   7
   8static struct rev_info log_tree_opt;
   9
  10static int diff_tree_commit_sha1(const unsigned char *sha1)
  11{
  12        struct commit *commit = lookup_commit_reference(sha1);
  13        if (!commit)
  14                return -1;
  15        return log_tree_commit(&log_tree_opt, commit);
  16}
  17
  18/* Diff one or more commits. */
  19static int stdin_diff_commit(struct commit *commit, char *line, int len)
  20{
  21        unsigned char sha1[20];
  22        if (isspace(line[40]) && !get_sha1_hex(line+41, sha1)) {
  23                /* Graft the fake parents locally to the commit */
  24                int pos = 41;
  25                struct commit_list **pptr, *parents;
  26
  27                /* Free the real parent list */
  28                for (parents = commit->parents; parents; ) {
  29                        struct commit_list *tmp = parents->next;
  30                        free(parents);
  31                        parents = tmp;
  32                }
  33                commit->parents = NULL;
  34                pptr = &(commit->parents);
  35                while (line[pos] && !get_sha1_hex(line + pos, sha1)) {
  36                        struct commit *parent = lookup_commit(sha1);
  37                        if (parent) {
  38                                pptr = &commit_list_insert(parent, pptr)->next;
  39                        }
  40                        pos += 41;
  41                }
  42        }
  43        return log_tree_commit(&log_tree_opt, commit);
  44}
  45
  46/* Diff two trees. */
  47static int stdin_diff_trees(struct tree *tree1, char *line, int len)
  48{
  49        unsigned char sha1[20];
  50        struct tree *tree2;
  51        if (len != 82 || !isspace(line[40]) || get_sha1_hex(line + 41, sha1))
  52                return error("Need exactly two trees, separated by a space");
  53        tree2 = lookup_tree(sha1);
  54        if (!tree2 || parse_tree(tree2))
  55                return -1;
  56        printf("%s %s\n", sha1_to_hex(tree1->object.sha1),
  57                          sha1_to_hex(tree2->object.sha1));
  58        diff_tree_sha1(tree1->object.sha1, tree2->object.sha1,
  59                       "", &log_tree_opt.diffopt);
  60        log_tree_diff_flush(&log_tree_opt);
  61        return 0;
  62}
  63
  64static int diff_tree_stdin(char *line)
  65{
  66        int len = strlen(line);
  67        unsigned char sha1[20];
  68        struct object *obj;
  69
  70        if (!len || line[len-1] != '\n')
  71                return -1;
  72        line[len-1] = 0;
  73        if (get_sha1_hex(line, sha1))
  74                return -1;
  75        obj = lookup_unknown_object(sha1);
  76        if (!obj || !obj->parsed)
  77                obj = parse_object(sha1);
  78        if (!obj)
  79                return -1;
  80        if (obj->type == OBJ_COMMIT)
  81                return stdin_diff_commit((struct commit *)obj, line, len);
  82        if (obj->type == OBJ_TREE)
  83                return stdin_diff_trees((struct tree *)obj, line, len);
  84        error("Object %s is a %s, not a commit or tree",
  85              sha1_to_hex(sha1), typename(obj->type));
  86        return -1;
  87}
  88
  89static const char diff_tree_usage[] =
  90"git diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
  91"[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
  92"  -r            diff recursively\n"
  93"  --root        include the initial commit as diff against /dev/null\n"
  94COMMON_DIFF_OPTIONS_HELP;
  95
  96static void diff_tree_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
  97{
  98        if (!rev->diffopt.output_format) {
  99                if (rev->dense_combined_merges)
 100                        rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 101                else
 102                        rev->diffopt.output_format = DIFF_FORMAT_RAW;
 103        }
 104}
 105
 106int cmd_diff_tree(int argc, const char **argv, const char *prefix)
 107{
 108        int nr_sha1;
 109        char line[1000];
 110        struct object *tree1, *tree2;
 111        static struct rev_info *opt = &log_tree_opt;
 112        struct setup_revision_opt s_r_opt;
 113        int read_stdin = 0;
 114
 115        init_revisions(opt, prefix);
 116        gitmodules_config();
 117        git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
 118        opt->abbrev = 0;
 119        opt->diff = 1;
 120        opt->disable_stdin = 1;
 121        memset(&s_r_opt, 0, sizeof(s_r_opt));
 122        s_r_opt.tweak = diff_tree_tweak_rev;
 123        argc = setup_revisions(argc, argv, opt, &s_r_opt);
 124
 125        while (--argc > 0) {
 126                const char *arg = *++argv;
 127
 128                if (!strcmp(arg, "--stdin")) {
 129                        read_stdin = 1;
 130                        continue;
 131                }
 132                usage(diff_tree_usage);
 133        }
 134
 135        /*
 136         * NOTE! We expect "a ^b" to be equal to "a..b", so we
 137         * reverse the order of the objects if the second one
 138         * is marked UNINTERESTING.
 139         */
 140        nr_sha1 = opt->pending.nr;
 141        switch (nr_sha1) {
 142        case 0:
 143                if (!read_stdin)
 144                        usage(diff_tree_usage);
 145                break;
 146        case 1:
 147                tree1 = opt->pending.objects[0].item;
 148                diff_tree_commit_sha1(tree1->sha1);
 149                break;
 150        case 2:
 151                tree1 = opt->pending.objects[0].item;
 152                tree2 = opt->pending.objects[1].item;
 153                if (tree2->flags & UNINTERESTING) {
 154                        struct object *tmp = tree2;
 155                        tree2 = tree1;
 156                        tree1 = tmp;
 157                }
 158                diff_tree_sha1(tree1->sha1,
 159                               tree2->sha1,
 160                               "", &opt->diffopt);
 161                log_tree_diff_flush(opt);
 162                break;
 163        }
 164
 165        if (read_stdin) {
 166                int saved_nrl = 0;
 167                int saved_dcctc = 0;
 168
 169                if (opt->diffopt.detect_rename)
 170                        opt->diffopt.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 171                                               DIFF_SETUP_USE_CACHE);
 172                while (fgets(line, sizeof(line), stdin)) {
 173                        unsigned char sha1[20];
 174
 175                        if (get_sha1_hex(line, sha1)) {
 176                                fputs(line, stdout);
 177                                fflush(stdout);
 178                        }
 179                        else {
 180                                diff_tree_stdin(line);
 181                                if (saved_nrl < opt->diffopt.needed_rename_limit)
 182                                        saved_nrl = opt->diffopt.needed_rename_limit;
 183                                if (opt->diffopt.degraded_cc_to_c)
 184                                        saved_dcctc = 1;
 185                        }
 186                }
 187                opt->diffopt.degraded_cc_to_c = saved_dcctc;
 188                opt->diffopt.needed_rename_limit = saved_nrl;
 189        }
 190
 191        return diff_result_code(&opt->diffopt, 0);
 192}