Moritz Neeb writes:
> In read_rebase_todolist() every line is, after reading, checked
> for a comment_line_char. After that it is trimmed via strbuf_trim().
> Assuming we do never expect a CR as comment_line_char,
> strbuf_getline_lf() can be safely replaced by its CRLF counterpart.
>
> Signed-off-by: Moritz Neeb
> ---
>
> Notes:
> Looking at the code in read_rebase_todolist(), the
> lines are read, checked for a comment_line_char and then trimmed. I
> wonder why the input is not trimmed before checking for this character?
> Is it safe to replace strbuf_getline_lf() by strbuf_getline() anyway?
> The only case I can imagine that could lead to unexpected behaviour
> then
> would be when someone sets the comment_line_char to CR. How likely is
> that?
> Why is the trim _after_ checking for the comment char anyway? Should
> something like " # foobar" not be considered as comment?
> I decided to roll out the patch because I considered it not as a risk
> to be
> taken seriously, that the comment line char will be '\r'.
> Meta-question: Should something of this discussion be put into the
> commit?
Yes to the meta question. Add something like this as the second
paragraph of the log message, but do *not* change the patch text.
The current code checks if the line begins with a comment
line char (typically '#') before trimming, which is
consistent with the way how commands like 'git commit'
prepares commented lines in that this does not treat a line
that begins with whitespaces and '#' as commented out. We
however made a mistake in the parser of "git rebase -i" long
time ago to allow such a line to be treated as a comment,
and made an exception with 1db168ee (rebase-i: loosen
over-eager check_bad_cmd check, 2015-10-01). It probably is
a good idea to match that exception by swapping the order of
comment check and trimming in this codepath as well.
>
> wt-status.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/wt-status.c b/wt-status.c
> index ab4f80d..f053b2f 100644
> --- a/wt-status.c
> +++ b/wt-status.c
> @@ -1076,7 +1076,7 @@ static void read_rebase_todolist(const char *fname,
> struct string_list *lines)
> if (!f)
> die_errno("Could not open file %s for reading",
> git_path("%s", fname));
> - while (!strbuf_getline_lf(&line, f)) {
> + while (!strbuf_getline(&line, f)) {
> if (line.len && line.buf[0] == comment_line_char)
> continue;
> strbuf_trim(&line);
--
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