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commit: use mergesort() in commit_list_sort_by_date() 

Replace the insertion sort in commit_list_sort_by_date() with a
call to the generic mergesort function.  This sets the stage for
using commit_list_sort_by_date() for larger lists, as shown in
the next patch.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
René Scharfe 2012-04-01 00:10:39 +02:00 committed by Junio C Hamano
parent 0db71e0fa9
commit 46905893b2
1 changed files with 23 additions and 6 deletions
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29
commit.c
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@ -7,6 +7,7 @@
#include "revision.h"
#include "notes.h"
#include "gpg-interface.h"
#include "mergesort.h"

int save_commit_buffer = 1;

@ -390,15 +391,31 @@ struct commit_list * commit_list_insert_by_date(struct commit *item, struct comm
return commit_list_insert(item, pp);
}

static int commit_list_compare_by_date(const void *a, const void *b)
{
unsigned long a_date = ((const struct commit_list *)a)->item->date;
unsigned long b_date = ((const struct commit_list *)b)->item->date;
if (a_date < b_date)
return 1;
if (a_date > b_date)
return -1;
return 0;
}

static void *commit_list_get_next(const void *a)
{
return ((const struct commit_list *)a)->next;
}

static void commit_list_set_next(void *a, void *next)
{
((struct commit_list *)a)->next = next;
}

void commit_list_sort_by_date(struct commit_list **list)
{
struct commit_list *ret = NULL;
while (*list) {
commit_list_insert_by_date((*list)->item, &ret);
*list = (*list)->next;
}
*list = ret;
*list = mergesort(*list, commit_list_get_next, commit_list_set_next,
commit_list_compare_by_date);
}

struct commit *pop_most_recent_commit(struct commit_list **list,