thodg/libgit2/src/message.c

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• Hash : f0e693b1
  Author :
  Date : 2021-09-07T17:53:49
  

  str: introduce `git_str` for internal, `git_buf` is external libgit2 has two distinct requirements that were previously solved by `git_buf`. We require: 1. A general purpose string class that provides a number of utility APIs for manipulating data (eg, concatenating, truncating, etc). 2. A structure that we can use to return strings to callers that they can take ownership of. By using a single class (`git_buf`) for both of these purposes, we have confused the API to the point that refactorings are difficult and reasoning about correctness is also difficult. Move the utility class `git_buf` to be called `git_str`: this represents its general purpose, as an internal string buffer class. The name also is an homage to Junio Hamano ("gitstr"). The public API remains `git_buf`, and has a much smaller footprint. It is generally only used as an "out" param with strict requirements that follow the documentation. (Exceptions exist for some legacy APIs to avoid breaking callers unnecessarily.) Utility functions exist to convert a user-specified `git_buf` to a `git_str` so that we can call internal functions, then converting it back again.

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• src/message.c

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "buf.h"
  
  #include "git2/message.h"
  
  static size_t line_length_without_trailing_spaces(const char *line, size_t len)
  {
  	while (len) {
  		unsigned char c = line[len - 1];
  		if (!git__isspace(c))
  			break;
  		len--;
  	}
  
  	return len;
  }
  
  /* Greatly inspired from git.git "stripspace" */
  /* see https://github.com/git/git/blob/497215d8811ac7b8955693ceaad0899ecd894ed2/builtin/stripspace.c#L4-67 */
  static int git_message__prettify(
  	git_str *message_out,
  	const char *message,
  	int strip_comments,
  	char comment_char)
  {
  	const size_t message_len = strlen(message);
  
  	int consecutive_empty_lines = 0;
  	size_t i, line_length, rtrimmed_line_length;
  	char *next_newline;
  
  	for (i = 0; i < strlen(message); i += line_length) {
  		next_newline = memchr(message + i, '\n', message_len - i);
  
  		if (next_newline != NULL) {
  			line_length = next_newline - (message + i) + 1;
  		} else {
  			line_length = message_len - i;
  		}
  
  		if (strip_comments && line_length && message[i] == comment_char)
  			continue;
  
  		rtrimmed_line_length = line_length_without_trailing_spaces(message + i, line_length);
  
  		if (!rtrimmed_line_length) {
  			consecutive_empty_lines++;
  			continue;
  		}
  
  		if (consecutive_empty_lines > 0 && message_out->size > 0)
  			git_str_putc(message_out, '\n');
  
  		consecutive_empty_lines = 0;
  		git_str_put(message_out, message + i, rtrimmed_line_length);
  		git_str_putc(message_out, '\n');
  	}
  
  	return git_str_oom(message_out) ? -1 : 0;
  }
  
  int git_message_prettify(
  	git_buf *message_out,
  	const char *message,
  	int strip_comments,
  	char comment_char)
  {
  	GIT_BUF_WRAP_PRIVATE(message_out, git_message__prettify, message, strip_comments, comment_char);
  }
  

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