line-range: fix "blame -L X,-N" regression

"blame -L X,-N" is documented as blaming "N lines ending at X".  In
practice, the behavior is achieved by swapping the two range endpoints
if the second is less than the first.  25ed3412 (Refactor parse_loc;
2013-03-28) broke this interpretation by removing the swapping code from
blame.c and failing to add it to line-range.c along with other code
relocated from blame.c. Thus, such a range is effectively treated as
empty.  Fix this regression.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/line-range.c b/line-range.c
index 8faf94374517b605d2529de2f4bafc869b72df60..3942475c2fc8e48c7f0a2d7808f77a4f71a1cde6 100644 (file)
--- a/line-range.c
+++ b/line-range.c
@@ -211,6 +211,8 @@ int parse_range_arg(const char *arg, nth_line_fn_t nth_line_cb,
                    void *cb_data, long lines, long *begin, long *end,
                    const char *path)
 {
+       *begin = *end = 0;
+
        if (*arg == ':') {
                arg = parse_range_funcname(arg, nth_line_cb, cb_data, lines, begin, end, path);
                if (!arg || *arg)
@@ -226,6 +228,11 @@ int parse_range_arg(const char *arg, nth_line_fn_t nth_line_cb,
        if (*arg)
                return -1;
 
+       if (*begin && *end && *end < *begin) {
+               long tmp;
+               tmp = *end; *end = *begin; *begin = tmp;
+       }
+
        return 0;
 }