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23 January 2022, 05:21:09 UTC
Revision 392809702016cde59d50a7b07e8c27f6d0ec3c3f authored by Junio C Hamano on 28 August 2008, 02:48:01 UTC, committed by Junio C Hamano on 31 August 2008, 03:34:45 UTC 
diff: Help "less" hide ^M from the output
 
When the tracked contents have CRLF line endings, colored diff output
shows "^M" at the end of output lines, which is distracting, even though
the pager we use by default ("less") knows to hide them.

The problem is that "less" hides a carriage-return only at the end of the
line, immediately before a line feed.  The colored diff output does not
take this into account, and emits four element sequence for each line:

   - force this color;
   - the line up to but not including the terminating line feed;
   - reset color
   - line feed.

By including the carriage return at the end of the line in the second
item, we are breaking the smart our pager has in order not to show "^M".
This can be fixed by changing the sequence to:

   - force this color;
   - the line up to but not including the terminating end-of-line;
   - reset color
   - end-of-line.

where end-of-line is either a single linefeed or a CRLF pair.  When the
output is not colored, "force this color" and "reset color" sequences are
both empty, so we won't have this problem with or without this patch.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
1 parent bbb896d
Raw File
Tip revision: 392809702016cde59d50a7b07e8c27f6d0ec3c3f authored by Junio C Hamano on 28 August 2008, 02:48:01 UTC
diff: Help "less" hide ^M from the output
Tip revision: 3928097
copy.c 
#include "cache.h"

int copy_fd(int ifd, int ofd)
{
	while (1) {
		char buffer[8192];
		char *buf = buffer;
		ssize_t len = xread(ifd, buffer, sizeof(buffer));
		if (!len)
			break;
		if (len < 0) {
			int read_error = errno;
			close(ifd);
			return error("copy-fd: read returned %s",
				     strerror(read_error));
		}
		while (len) {
			int written = xwrite(ofd, buf, len);
			if (written > 0) {
				buf += written;
				len -= written;
			}
			else if (!written) {
				close(ifd);
				return error("copy-fd: write returned 0");
			} else {
				int write_error = errno;
				close(ifd);
				return error("copy-fd: write returned %s",
					     strerror(write_error));
			}
		}
	}
	close(ifd);
	return 0;
}

int copy_file(const char *dst, const char *src, int mode)
{
	int fdi, fdo, status;

	mode = (mode & 0111) ? 0777 : 0666;
	if ((fdi = open(src, O_RDONLY)) < 0)
		return fdi;
	if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
		close(fdi);
		return fdo;
	}
	status = copy_fd(fdi, fdo);
	if (close(fdo) != 0)
		return error("%s: close error: %s", dst, strerror(errno));

	if (!status && adjust_shared_perm(dst))
		return -1;

	return status;
}
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