src/message.c

   1 /*
   2  * Copyright (C) the libgit2 contributors. All rights reserved.
   3  *
   4  * This file is part of libgit2, distributed under the GNU GPL v2 with
   5  * a Linking Exception. For full terms see the included COPYING file.
   6  */
   7
   8 #include "message.h"
   9
  10 static size_t line_length_without_trailing_spaces(const char *line, size_t len)
  11 {
  12         while (len) {
  13                 unsigned char c = line[len - 1];
  14                 if (!git__isspace(c))
  15                         break;
  16                 len--;
  17         }
  18
  19         return len;
  20 }
  21
  22 /* Greatly inspired from git.git "stripspace" */
  23 /* see https://github.com/git/git/blob/497215d8811ac7b8955693ceaad0899ecd894ed2/builtin/stripspace.c#L4-67 */
  24 int git_message_prettify(git_buf *message_out, const char *message, int strip_comments, char comment_char)
  25 {
  26         const size_t message_len = strlen(message);
  27
  28         int consecutive_empty_lines = 0;
  29         size_t i, line_length, rtrimmed_line_length;
  30         char *next_newline;
  31         int error;
  32
  33         if ((error = git_buf_sanitize(message_out)) < 0)
  34                 return error;
  35
  36         for (i = 0; i < strlen(message); i += line_length) {
  37                 next_newline = memchr(message + i, '\n', message_len - i);
  38
  39                 if (next_newline != NULL) {
  40                         line_length = next_newline - (message + i) + 1;
  41                 } else {
  42                         line_length = message_len - i;
  43                 }
  44
  45                 if (strip_comments && line_length && message[i] == comment_char)
  46                         continue;
  47
  48                 rtrimmed_line_length = line_length_without_trailing_spaces(message + i, line_length);
  49
  50                 if (!rtrimmed_line_length) {
  51                         consecutive_empty_lines++;
  52                         continue;
  53                 }
  54
  55                 if (consecutive_empty_lines > 0 && message_out->size > 0)
  56                         git_buf_putc(message_out, '\n');
  57
  58                 consecutive_empty_lines = 0;
  59                 git_buf_put(message_out, message + i, rtrimmed_line_length);
  60                 git_buf_putc(message_out, '\n');
  61         }
  62
  63         return git_buf_oom(message_out) ? -1 : 0;
  64 }