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diffcore-order: export generic ordering interface

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diffcore_order() interface only accepts a queue of `struct
diff_filepair`.

In the next patches, we'll want to order `struct combine_diff_path`
by path, so let's first rework diffcore-order to also provide
generic low-level interface for ordering arbitrary objects, provided
they have path accessors.

The new interface is:

    - `struct obj_order`    for describing objects to ordering routine, and
    - order_objects()       for actually doing the ordering work.

Signed-off-by: Kirill Smelkov <kirr@mns.spb.ru>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Kirill Smelkov 2014-01-20 20:20:38 +04:00 committed by Junio C Hamano
parent 7146e66f08
commit 1df4320fa2
2 changed files with 46 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

51
diffcore-order.c
View File

@ -57,12 +57,6 @@ static void prepare_order(const char *orderfile)
}
}
struct pair_order {
struct diff_filepair *pair;
int orig_order;
int order;
};
static int match_order(const char *path)
{
int i;
@ -84,35 +78,54 @@ static int match_order(const char *path)
return order_cnt;
}
static int compare_pair_order(const void *a_, const void *b_)
static int compare_objs_order(const void *a_, const void *b_)
{
struct pair_order const *a, *b;
a = (struct pair_order const *)a_;
b = (struct pair_order const *)b_;
struct obj_order const *a, *b;
a = (struct obj_order const *)a_;
b = (struct obj_order const *)b_;
if (a->order != b->order)
return a->order - b->order;
return a->orig_order - b->orig_order;
}
void order_objects(const char *orderfile, obj_path_fn_t obj_path,
struct obj_order *objs, int nr)
{
int i;
if (!nr)
return;
prepare_order(orderfile);
for (i = 0; i < nr; i++) {
objs[i].orig_order = i;
objs[i].order = match_order(obj_path(objs[i].obj));
}
qsort(objs, nr, sizeof(*objs), compare_objs_order);
}
static const char *pair_pathtwo(void *obj)
{
struct diff_filepair *pair = (struct diff_filepair *)obj;
return pair->two->path;
}
void diffcore_order(const char *orderfile)
{
struct diff_queue_struct *q = &diff_queued_diff;
struct pair_order *o;
struct obj_order *o;
int i;
if (!q->nr)
return;
o = xmalloc(sizeof(*o) * q->nr);
prepare_order(orderfile);
for (i = 0; i < q->nr; i++) {
o[i].pair = q->queue[i];
o[i].orig_order = i;
o[i].order = match_order(o[i].pair->two->path);
}
qsort(o, q->nr, sizeof(*o), compare_pair_order);
for (i = 0; i < q->nr; i++)
q->queue[i] = o[i].pair;
o[i].obj = q->queue[i];
order_objects(orderfile, pair_pathtwo, o, q->nr);
for (i = 0; i < q->nr; i++)
q->queue[i] = o[i].obj;
free(o);
return;
}

14
diffcore.h
View File

@ -109,6 +109,20 @@ extern void diffcore_merge_broken(void);
extern void diffcore_pickaxe(struct diff_options *);
extern void diffcore_order(const char *orderfile);
/* low-level interface to diffcore_order */
struct obj_order {
void *obj; /* setup by caller */
/* setup/used by order_objects() */
int orig_order;
int order;
};
typedef const char *(*obj_path_fn_t)(void *obj);
void order_objects(const char *orderfile, obj_path_fn_t obj_path,
struct obj_order *objs, int nr);
#define DIFF_DEBUG 0
#if DIFF_DEBUG
void diff_debug_filespec(struct diff_filespec *, int, const char *);