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log: prevent error if line range ends past end of file

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If the -L option is used to specify a line range in git log, and the end
of the range is past the end of the file, git will fail with a fatal
error. This commit prevents such behaviour - instead we perform the log
for existing lines within the specified range.

This commit also fixes a corner case where -L ,-n:file would be treated
as a log over the whole file. Now we treat this as -L 1,-n:file and
blame the first line of the file instead.

Signed-off-by: Isabella Stephens <istephens@atlassian.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Isabella Stephens
2018-06-15 16:29:28 +10:00
committed by Junio C Hamano
parent 96cfa94e68
commit 7f81c00f3b
2 changed files with 4 additions and 5 deletions
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4
line-log.c
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@ -599,11 +599,11 @@ parse_lines(struct commit *commit, const char *prefix, struct string_list *args)
lines, anchor, &begin, &end,
full_name))
die("malformed -L argument '%s'", range_part);
if (lines < end || ((lines || begin) && lines < begin))
if ((!lines && (begin || end)) || lines < begin)
die("file %s has only %lu lines", name_part, lines);
if (begin < 1)
begin = 1;
if (end < 1)
if (end < 1 || lines < end)
end = lines;
begin--;
line_log_data_insert(&ranges, full_name, begin, end);