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blame: accept multiple -L ranges 

git-blame accepts only a single -L option or none. Clients requiring
blame information for multiple disjoint ranges are therefore forced
either to invoke git-blame multiple times, once for each range, or only
once with no -L option to cover the entire file, both of which can be
costly.  Teach git-blame to accept multiple -L ranges.  Overlapping and
out-of-order ranges are accepted.

In this patch, the X in -LX,Y is absolute (for instance, /RE/ patterns
search from line 1), and Y is relative to X. Follow-up patches provide
more flexibility over how X is anchored.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eric Sunshine 2013-08-06 09:59:38 -04:00 committed by Junio C Hamano
parent 753935749f
commit 58dbfa2e59
1 changed files with 46 additions and 31 deletions
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77
builtin/blame.c
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@ -22,6 +22,7 @@
#include "utf8.h"
#include "userdiff.h"
#include "line-range.h"
#include "line-log.h"
static char blame_usage[] = N_("git blame [options] [rev-opts] [rev] [--] file");
@ -2233,29 +2234,18 @@ static int blame_move_callback(const struct option *option, const char *arg, int
return 0;
}
static int blame_bottomtop_callback(const struct option *option, const char *arg, int unset)
{
const char **bottomtop = option->value;
if (!arg)
return -1;
if (*bottomtop)
die("More than one '-L n,m' option given");
*bottomtop = arg;
return 0;
}
int cmd_blame(int argc, const char **argv, const char *prefix)
{
struct rev_info revs;
const char *path;
struct scoreboard sb;
struct origin *o;
struct blame_entry *ent;
long dashdash_pos, bottom, top, lno;
struct blame_entry *ent = NULL;
long dashdash_pos, lno;
const char *final_commit_name = NULL;
enum object_type type;
static const char *bottomtop = NULL;
static struct string_list range_list;
static int output_option = 0, opt = 0;
static int show_stats = 0;
static const char *revs_file = NULL;
@ -2281,13 +2271,15 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
OPT_STRING(0, "contents", &contents_from, N_("file"), N_("Use <file>'s contents as the final image")),
{ OPTION_CALLBACK, 'C', NULL, &opt, N_("score"), N_("Find line copies within and across files"), PARSE_OPT_OPTARG, blame_copy_callback },
{ OPTION_CALLBACK, 'M', NULL, &opt, N_("score"), N_("Find line movements within and across files"), PARSE_OPT_OPTARG, blame_move_callback },
OPT_CALLBACK('L', NULL, &bottomtop, N_("n,m"), N_("Process only line range n,m, counting from 1"), blame_bottomtop_callback),
OPT_STRING_LIST('L', NULL, &range_list, N_("n,m"), N_("Process only line range n,m, counting from 1")),
OPT__ABBREV(&abbrev),
OPT_END()
};
struct parse_opt_ctx_t ctx;
int cmd_is_annotate = !strcmp(argv[0], "annotate");
struct range_set ranges;
unsigned int range_i;
git_config(git_blame_config, NULL);
init_revisions(&revs, NULL);
@ -2480,23 +2472,46 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
num_read_blob++;
lno = prepare_lines(&sb);
bottom = top = 0;
if (bottomtop && parse_range_arg(bottomtop, nth_line_cb, &sb, lno,
&bottom, &top, sb.path))
usage(blame_usage);
if (lno < top || ((lno || bottom) && lno < bottom))
die("file %s has only %lu lines", path, lno);
if (bottom < 1)
bottom = 1;
if (top < 1)
top = lno;
bottom--;
if (lno && !range_list.nr)
string_list_append(&range_list, xstrdup("1"));
ent = xcalloc(1, sizeof(*ent));
ent->lno = bottom;
ent->num_lines = top - bottom;
ent->suspect = o;
ent->s_lno = bottom;
range_set_init(&ranges, range_list.nr);
for (range_i = 0; range_i < range_list.nr; ++range_i) {
long bottom, top;
if (parse_range_arg(range_list.items[range_i].string,
nth_line_cb, &sb, lno,
&bottom, &top, sb.path))
usage(blame_usage);
if (lno < top || ((lno || bottom) && lno < bottom))
die("file %s has only %lu lines", path, lno);
if (bottom < 1)
bottom = 1;
if (top < 1)
top = lno;
bottom--;
range_set_append_unsafe(&ranges, bottom, top);
}
sort_and_merge_range_set(&ranges);
for (range_i = ranges.nr; range_i > 0; --range_i) {
const struct range *r = &ranges.ranges[range_i - 1];
long bottom = r->start;
long top = r->end;
struct blame_entry *next = ent;
ent = xcalloc(1, sizeof(*ent));
ent->lno = bottom;
ent->num_lines = top - bottom;
ent->suspect = o;
ent->s_lno = bottom;
ent->next = next;
if (next)
next->prev = ent;
origin_incref(o);
}
origin_decref(o);
range_set_release(&ranges);
string_list_clear(&range_list, 0);
sb.ent = ent;
sb.path = path;