log-tree.c

   1 #include "cache.h"
   2 #include "diff.h"
   3 #include "commit.h"
   4 #include "log-tree.h"
   5
   6 static void show_parents(struct commit *commit, int abbrev)
   7 {
   8         struct commit_list *p;
   9         for (p = commit->parents; p ; p = p->next) {
  10                 struct commit *parent = p->item;
  11                 printf(" %s", diff_unique_abbrev(parent->object.sha1, abbrev));
  12         }
  13 }
  14
  15 void show_log(struct rev_info *opt, struct log_info *log, const char *sep)
  16 {
  17         static char this_header[16384];
  18         struct commit *commit = log->commit, *parent = log->parent;
  19         int abbrev = opt->diffopt.abbrev;
  20         int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
  21         const char *extra;
  22         int len;
  23
  24         opt->loginfo = NULL;
  25         if (!opt->verbose_header) {
  26                 fputs(diff_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
  27                 if (opt->parents)
  28                         show_parents(commit, abbrev_commit);
  29                 putchar('\n');
  30                 return;
  31         }
  32
  33         /*
  34          * The "oneline" format has several special cases:
  35          *  - The pretty-printed commit lacks a newline at the end
  36          *    of the buffer, but we do want to make sure that we
  37          *    have a newline there. If the separator isn't already
  38          *    a newline, add an extra one.
  39          *  - unlike other log messages, the one-line format does
  40          *    not have an empty line between entries.
  41          */
  42         extra = "";
  43         if (*sep != '\n' && opt->commit_format == CMIT_FMT_ONELINE)
  44                 extra = "\n";
  45         if (opt->shown_one && opt->commit_format != CMIT_FMT_ONELINE)
  46                 putchar('\n');
  47         opt->shown_one = 1;
  48
  49         /*
  50          * Print header line of header..
  51          */
  52         printf("%s%s",
  53                 opt->commit_format == CMIT_FMT_ONELINE ? "" : "commit ",
  54                 diff_unique_abbrev(commit->object.sha1, abbrev_commit));
  55         if (opt->parents)
  56                 show_parents(commit, abbrev_commit);
  57         if (parent)
  58                 printf(" (from %s)", diff_unique_abbrev(parent->object.sha1, abbrev_commit));
  59         putchar(opt->commit_format == CMIT_FMT_ONELINE ? ' ' : '\n');
  60
  61         /*
  62          * And then the pretty-printed message itself
  63          */
  64         len = pretty_print_commit(opt->commit_format, commit, ~0u, this_header, sizeof(this_header), abbrev);
  65         printf("%s%s%s", this_header, extra, sep);
  66 }
  67
  68 int log_tree_diff_flush(struct rev_info *opt)
  69 {
  70         diffcore_std(&opt->diffopt);
  71
  72         if (diff_queue_is_empty()) {
  73                 int saved_fmt = opt->diffopt.output_format;
  74                 opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
  75                 diff_flush(&opt->diffopt);
  76                 opt->diffopt.output_format = saved_fmt;
  77                 return 0;
  78         }
  79
  80         if (opt->loginfo && !opt->no_commit_id)
  81                 show_log(opt, opt->loginfo, opt->diffopt.with_stat ? "---\n" : "\n");
  82         diff_flush(&opt->diffopt);
  83         return 1;
  84 }
  85
  86 static int diff_root_tree(struct rev_info *opt,
  87                           const unsigned char *new, const char *base)
  88 {
  89         int retval;
  90         void *tree;
  91         struct tree_desc empty, real;
  92
  93         tree = read_object_with_reference(new, tree_type, &real.size, NULL);
  94         if (!tree)
  95                 die("unable to read root tree (%s)", sha1_to_hex(new));
  96         real.buf = tree;
  97
  98         empty.buf = "";
  99         empty.size = 0;
 100         retval = diff_tree(&empty, &real, base, &opt->diffopt);
 101         free(tree);
 102         log_tree_diff_flush(opt);
 103         return retval;
 104 }
 105
 106 static int do_diff_combined(struct rev_info *opt, struct commit *commit)
 107 {
 108         unsigned const char *sha1 = commit->object.sha1;
 109
 110         diff_tree_combined_merge(sha1, opt->dense_combined_merges, opt);
 111         return !opt->loginfo;
 112 }
 113
 114 /*
 115  * Show the diff of a commit.
 116  *
 117  * Return true if we printed any log info messages
 118  */
 119 static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
 120 {
 121         int showed_log;
 122         struct commit_list *parents;
 123         unsigned const char *sha1 = commit->object.sha1;
 124
 125         if (!opt->diff)
 126                 return 0;
 127
 128         /* Root commit? */
 129         parents = commit->parents;
 130         if (!parents) {
 131                 if (opt->show_root_diff)
 132                         diff_root_tree(opt, sha1, "");
 133                 return !opt->loginfo;
 134         }
 135
 136         /* More than one parent? */
 137         if (parents && parents->next) {
 138                 if (opt->ignore_merges)
 139                         return 0;
 140                 else if (opt->combine_merges)
 141                         return do_diff_combined(opt, commit);
 142
 143                 /* If we show individual diffs, show the parent info */
 144                 log->parent = parents->item;
 145         }
 146
 147         showed_log = 0;
 148         for (;;) {
 149                 struct commit *parent = parents->item;
 150
 151                 diff_tree_sha1(parent->object.sha1, sha1, "", &opt->diffopt);
 152                 log_tree_diff_flush(opt);
 153
 154                 showed_log |= !opt->loginfo;
 155
 156                 /* Set up the log info for the next parent, if any.. */
 157                 parents = parents->next;
 158                 if (!parents)
 159                         break;
 160                 log->parent = parents->item;
 161                 opt->loginfo = log;
 162         }
 163         return showed_log;
 164 }
 165
 166 int log_tree_commit(struct rev_info *opt, struct commit *commit)
 167 {
 168         struct log_info log;
 169
 170         log.commit = commit;
 171         log.parent = NULL;
 172         opt->loginfo = &log;
 173
 174         if (!log_tree_diff(opt, commit, &log) && opt->loginfo && opt->always_show_header) {
 175                 log.parent = NULL;
 176                 show_log(opt, opt->loginfo, "");
 177         }
 178         opt->loginfo = NULL;
 179         return 0;
 180 }