log-tree.c

   1 #include "cache.h"
   2 #include "diff.h"
   3 #include "commit.h"
   4 #include "log-tree.h"
   5
   6 void show_log(struct rev_info *opt, struct log_info *log, const char *sep)
   7 {
   8         static char this_header[16384];
   9         struct commit *commit = log->commit, *parent = log->parent;
  10         int abbrev = opt->diffopt.abbrev;
  11         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
  12         const char *extra;
  13         int len;
  14
  15         opt->loginfo = NULL;
  16         if (!opt->verbose_header) {
  17                 puts(sha1_to_hex(commit->object.sha1));
  18                 return;
  19         }
  20
  21         /*
  22          * The "oneline" format has several special cases:
  23          *  - The pretty-printed commit lacks a newline at the end
  24          *    of the buffer, but we do want to make sure that we
  25          *    have a newline there. If the separator isn't already
  26          *    a newline, add an extra one.
  27          *  - unlike other log messages, the one-line format does
  28          *    not have an empty line between entries.
  29          */
  30         extra = "";
  31         if (*sep != '\n' && opt->commit_format == CMIT_FMT_ONELINE)
  32                 extra = "\n";
  33         if (opt->shown_one && opt->commit_format != CMIT_FMT_ONELINE)
  34                 putchar('\n');
  35         opt->shown_one = 1;
  36
  37         /*
  38          * Print header line of header..
  39          */
  40         printf("%s%s",
  41                 opt->commit_format == CMIT_FMT_ONELINE ? "" : "commit ",
  42                 diff_unique_abbrev(commit->object.sha1, abbrev_commit));
  43         if (parent)
  44                 printf(" (from %s)", diff_unique_abbrev(parent->object.sha1, abbrev_commit));
  45         putchar(opt->commit_format == CMIT_FMT_ONELINE ? ' ' : '\n');
  46
  47         /*
  48          * And then the pretty-printed message itself
  49          */
  50         len = pretty_print_commit(opt->commit_format, commit, ~0u, this_header, sizeof(this_header), abbrev);
  51         printf("%s%s%s", this_header, extra, sep);
  52 }
  53
  54 int log_tree_diff_flush(struct rev_info *opt)
  55 {
  56         diffcore_std(&opt->diffopt);
  57
  58         if (diff_queue_is_empty()) {
  59                 int saved_fmt = opt->diffopt.output_format;
  60                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
  61                 diff_flush(&opt->diffopt);
  62                 opt->diffopt.output_format = saved_fmt;
  63                 return 0;
  64         }
  65
  66         if (opt->loginfo && !opt->no_commit_id)
  67                 show_log(opt, opt->loginfo, opt->diffopt.with_stat ? "---\n" : "\n");
  68         diff_flush(&opt->diffopt);
  69         return 1;
  70 }
  71
  72 static int diff_root_tree(struct rev_info *opt,
  73                           const unsigned char *new, const char *base)
  74 {
  75         int retval;
  76         void *tree;
  77         struct tree_desc empty, real;
  78
  79         tree = read_object_with_reference(new, tree_type, &real.size, NULL);
  80         if (!tree)
  81                 die("unable to read root tree (%s)", sha1_to_hex(new));
  82         real.buf = tree;
  83
  84         empty.buf = "";
  85         empty.size = 0;
  86         retval = diff_tree(&empty, &real, base, &opt->diffopt);
  87         free(tree);
  88         log_tree_diff_flush(opt);
  89         return retval;
  90 }
  91
  92 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
  93 {
  94         unsigned const char *sha1 = commit->object.sha1;
  95
  96         diff_tree_combined_merge(sha1, opt->dense_combined_merges, opt);
  97         return !opt->loginfo;
  98 }
  99
 100 /*
 101  * Show the diff of a commit.
 102  *
 103  * Return true if we printed any log info messages
 104  */
 105 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 106 {
 107         int showed_log;
 108         struct commit_list *parents;
 109         unsigned const char *sha1 = commit->object.sha1;
 110
 111         if (!opt->diff)
 112                 return 0;
 113
 114         /* Root commit? */
 115         parents = commit->parents;
 116         if (!parents) {
 117                 if (opt->show_root_diff)
 118                         diff_root_tree(opt, sha1, "");
 119                 return !opt->loginfo;
 120         }
 121
 122         /* More than one parent? */
 123         if (parents && parents->next) {
 124                 if (opt->ignore_merges)
 125                         return 0;
 126                 else if (opt->combine_merges)
 127                         return do_diff_combined(opt, commit);
 128
 129                 /* If we show individual diffs, show the parent info */
 130                 log->parent = parents->item;
 131         }
 132
 133         showed_log = 0;
 134         for (;;) {
 135                 struct commit *parent = parents->item;
 136
 137                 diff_tree_sha1(parent->object.sha1, sha1, "", &opt->diffopt);
 138                 log_tree_diff_flush(opt);
 139
 140                 showed_log |= !opt->loginfo;
 141
 142                 /* Set up the log info for the next parent, if any.. */
 143                 parents = parents->next;
 144                 if (!parents)
 145                         break;
 146                 log->parent = parents->item;
 147                 opt->loginfo = log;
 148         }
 149         return showed_log;
 150 }
 151
 152 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 153 {
 154         struct log_info log;
 155
 156         log.commit = commit;
 157         log.parent = NULL;
 158         opt->loginfo = &log;
 159
 160         if (!log_tree_diff(opt, commit, &log) && opt->loginfo && opt->always_show_header) {
 161                 log.parent = NULL;
 162                 show_log(opt, opt->loginfo, "");
 163         }
 164         opt->loginfo = NULL;
 165         return 0;
 166 }