Re: [PATCH v2] blame: prevent error if range ends past end of file

[Isabella Stephens <istephens@atlassian.com>]

On 27/10/17 2:31 am, SZEDER Gábor wrote:
>> If the -L option is used to specify a line range in git blame, and the
>> end of the range is past the end of the file, at present git will fail
>> with a fatal error. This commit prevents such behaviour - instead the
>> blame is display for any existing lines within the specified range.
> 
> s/is display/is displayed/ ?
Oops.

> 
> 'git log' has a very similar -L option, which errors out, too, if the
> end of the line range is past the end of the file.  IMHO the
> interpretation of the line range -L<start>,<end> should be kept
> consistent in the two commands, and 'git log' shouldn't error out,
> either.
Good suggestion. I'll submit a separate patch for git log.

> 
>> Signed-off-by: Isabella Stephens <istephens@atlassian.com>
>> ---
>>  builtin/blame.c               | 4 ++--
>>  t/t8003-blame-corner-cases.sh | 5 +++--
>>  2 files changed, 5 insertions(+), 4 deletions(-)
>>
>> diff --git a/builtin/blame.c b/builtin/blame.c
>> index 67adaef4d..b5b9db147 100644
>> --- a/builtin/blame.c
>> +++ b/builtin/blame.c
>> @@ -878,13 +878,13 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
>>  				    nth_line_cb, &sb, lno, anchor,
>>  				    &bottom, &top, sb.path))
>>  			usage(blame_usage);
>> -		if (lno < top || ((lno || bottom) && lno < bottom))
>> +		if ((lno || bottom) && lno < bottom)
>>  			die(Q_("file %s has only %lu line",
>>  			       "file %s has only %lu lines",
>>  			       lno), path, lno);
>>  		if (bottom < 1)
>>  			bottom = 1;
>> -		if (top < 1)
>> +		if (top < 1 || lno < top)
>>  			top = lno;
>>  		bottom--;
>>  		range_set_append_unsafe(&ranges, bottom, top);
>> diff --git a/t/t8003-blame-corner-cases.sh b/t/t8003-blame-corner-cases.sh
>> index 661f9d430..32b3788fe 100755
>> --- a/t/t8003-blame-corner-cases.sh
>> +++ b/t/t8003-blame-corner-cases.sh
>> @@ -216,8 +216,9 @@ test_expect_success 'blame -L with invalid start' '
>>  '
>>  
>>  test_expect_success 'blame -L with invalid end' '
>> -	test_must_fail git blame -L1,5 tres 2>errors &&
>> -	test_i18ngrep "has only 2 lines" errors
>> +	git blame -L1,5 tres >out &&
>> +	cat out &&
>> +	test $(wc -l < out) -eq 2
> 
> Please use the test_line_count helper instead, as it will output a
> helpful error message on failure, making the 'cat out' above
> unnecessary.
> Thanks for pointing that out.

>>  '
>>  
>>  test_expect_success 'blame parses <end> part of -L' '
>> -- 
>> 2.14.1
>>
>>