Add generic commit "pretty print" function.

[git.git] / commit.c

diff --git a/commit.c b/commit.c
index a466f7d..de5e94d 100644 (file)
--- a/commit.c
+++ b/commit.c
@@ -174,3 +174,83 @@ struct commit *pop_most_recent_commit(struct commit_list **list,
        }
        return ret;
 }
+
+/*
+ * Generic support for pretty-printing the header
+ */
+static int get_one_line(const char *msg, unsigned long len)
+{
+       int ret = 0;
+
+       while (len--) {
+               char c = *msg++;
+               ret++;
+               if (c == '\n')
+                       break;
+               if (!c)
+                       return 0;
+       }
+       return ret;
+}
+
+static int add_author_info(char *buf, const char *line, int len)
+{
+       char *date;
+       unsigned int namelen;
+       unsigned long time;
+       int tz;
+
+       line += strlen("author ");
+       date = strchr(line, '>');
+       if (!date)
+               return 0;
+       namelen = ++date - line;
+       time = strtoul(date, &date, 10);
+       tz = strtol(date, NULL, 10);
+
+       return sprintf(buf, "Author: %.*s\nDate:   %s\n",
+               namelen, line,
+               show_date(time, tz));
+}
+
+unsigned long pretty_print_commit(const char *msg, unsigned long len, char *buf, unsigned long space)
+{
+       int hdr = 1;
+       unsigned long offset = 0;
+
+       for (;;) {
+               const char *line = msg;
+               int linelen = get_one_line(msg, len);
+
+               if (!linelen)
+                       break;
+
+               /*
+                * We want some slop for indentation and a possible
+                * final "...". Thus the "+ 20".
+                */
+               if (offset + linelen + 20 > space) {
+                       memcpy(buf + offset, "    ...\n", 8);
+                       offset += 8;
+                       break;
+               }
+
+               msg += linelen;
+               len -= linelen;
+               if (linelen == 1)
+                       hdr = 0;
+               if (hdr) {
+                       if (!memcmp(line, "author ", 7))
+                               offset += add_author_info(buf + offset, line, linelen);
+                       continue;
+               }
+               memset(buf + offset, ' ', 4);
+               memcpy(buf + offset + 4, line, linelen);
+               offset += linelen + 4;
+       }
+       /* Make sure there is an EOLN */
+       if (buf[offset - 1] != '\n')
+               buf[offset++] = '\n';
+       buf[offset] = '\0';
+       return offset;
+}