git/line-range.h
Eric Sunshine 815834e9aa line-range: teach -L/RE/ to search relative to anchor point
Range specification -L/RE/ for blame/log unconditionally begins
searching at line one. Mailing list discussion [1] suggests that, in the
presence of multiple -L options, -L/RE/ should search relative to the
endpoint of the previous -L range, if any.

Teach the parsing machinery underlying blame's and log's -L options to
accept a start point for -L/RE/ searches. Follow-up patches will upgrade
blame and log to take advantage of this ability.

[1]: http://thread.gmane.org/gmane.comp.version-control.git/229755/focus=229966

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-08-06 14:36:34 -07:00

40 lines
1.3 KiB
C

#ifndef LINE_RANGE_H
#define LINE_RANGE_H
/*
* Parse one item in an -L begin,end option w.r.t. the notional file
* object 'cb_data' consisting of 'lines' lines.
*
* The 'nth_line_cb' callback is used to determine the start of the
* line 'lno' inside the 'cb_data'. The caller is expected to already
* have a suitable map at hand to make this a constant-time lookup.
*
* 'anchor' is the 1-based line at which relative range specifications
* should be anchored. Absolute ranges are unaffected by this value.
*
* Returns 0 in case of success and -1 if there was an error. The
* actual range is stored in *begin and *end. The counting starts
* at 1! In case of error, the caller should show usage message.
*/
typedef const char *(*nth_line_fn_t)(void *data, long lno);
extern int parse_range_arg(const char *arg,
nth_line_fn_t nth_line_cb,
void *cb_data, long lines, long anchor,
long *begin, long *end,
const char *path);
/*
* Scan past a range argument that could be parsed by
* 'parse_range_arg', to help the caller determine the start of the
* filename in '-L n,m:file' syntax.
*
* Returns a pointer to the first character after the 'n,m' part, or
* NULL in case the argument is obviously malformed.
*/
extern const char *skip_range_arg(const char *arg);
#endif /* LINE_RANGE_H */