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 "buf.h"
   9
  10 #include "git2/message.h"
  11
  12 static size_t line_length_without_trailing_spaces(const char *line, size_t len)
  13 {
  14         while (len) {
  15                 unsigned char c = line[len - 1];
  16                 if (!git__isspace(c))
  17                         break;
  18                 len--;
  19         }
  20
  21         return len;
  22 }
  23
  24 /* Greatly inspired from git.git "stripspace" */
  25 /* see https://github.com/git/git/blob/497215d8811ac7b8955693ceaad0899ecd894ed2/builtin/stripspace.c#L4-67 */
  26 static int git_message__prettify(
  27         git_str *message_out,
  28         const char *message,
  29         int strip_comments,
  30         char comment_char)
  31 {
  32         const size_t message_len = strlen(message);
  33
  34         int consecutive_empty_lines = 0;
  35         size_t i, line_length, rtrimmed_line_length;
  36         char *next_newline;
  37
  38         for (i = 0; i < strlen(message); i += line_length) {
  39                 next_newline = memchr(message + i, '\n', message_len - i);
  40
  41                 if (next_newline != NULL) {
  42                         line_length = next_newline - (message + i) + 1;
  43                 } else {
  44                         line_length = message_len - i;
  45                 }
  46
  47                 if (strip_comments && line_length && message[i] == comment_char)
  48                         continue;
  49
  50                 rtrimmed_line_length = line_length_without_trailing_spaces(message + i, line_length);
  51
  52                 if (!rtrimmed_line_length) {
  53                         consecutive_empty_lines++;
  54                         continue;
  55                 }
  56
  57                 if (consecutive_empty_lines > 0 && message_out->size > 0)
  58                         git_str_putc(message_out, '\n');
  59
  60                 consecutive_empty_lines = 0;
  61                 git_str_put(message_out, message + i, rtrimmed_line_length);
  62                 git_str_putc(message_out, '\n');
  63         }
  64
  65         return git_str_oom(message_out) ? -1 : 0;
  66 }
  67
  68 int git_message_prettify(
  69         git_buf *message_out,
  70         const char *message,
  71         int strip_comments,
  72         char comment_char)
  73 {
  74         GIT_BUF_WRAP_PRIVATE(message_out, git_message__prettify, message, strip_comments, comment_char);
  75 }