Blame src/message.c

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