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versionsort: support reorder prerelease suffixes

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Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy
2015-02-26 17:44:01 +07:00
committed by Junio C Hamano
parent fdf96a20ac
commit d811c8e17c
3 changed files with 85 additions and 0 deletions
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50
versioncmp.c
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@@ -1,4 +1,5 @@
#include "cache.h"
#include "string-list.h"
/*
* versioncmp(): copied from string/strverscmp.c in glibc commit
@@ -20,6 +21,48 @@
#define CMP 2
#define LEN 3
static const struct string_list *prereleases;
static int initialized;
/*
* p1 and p2 point to the first different character in two strings. If
* either p1 or p2 starts with a prerelease suffix, it will be forced
* to be on top.
*
* If both p1 and p2 start with (different) suffix, the order is
* determined by config file.
*
* Note that we don't have to deal with the situation when both p1 and
* p2 start with the same suffix because the common part is already
* consumed by the caller.
*
* Return non-zero if *diff contains the return value for versioncmp()
*/
static int swap_prereleases(const void *p1_,
const void *p2_,
int *diff)
{
const char *p1 = p1_;
const char *p2 = p2_;
int i, i1 = -1, i2 = -1;
for (i = 0; i < prereleases->nr; i++) {
const char *suffix = prereleases->items[i].string;
if (i1 == -1 && starts_with(p1, suffix))
i1 = i;
if (i2 == -1 && starts_with(p2, suffix))
i2 = i;
}
if (i1 == -1 && i2 == -1)
return 0;
if (i1 >= 0 && i2 >= 0)
*diff = i1 - i2;
else if (i1 >= 0)
*diff = -1;
else /* if (i2 >= 0) */
*diff = 1;
return 1;
}
/*
* Compare S1 and S2 as strings holding indices/version numbers,
@@ -74,6 +117,13 @@ int versioncmp(const char *s1, const char *s2)
state += (c1 == '0') + (isdigit (c1) != 0);
}
if (!initialized) {
initialized = 1;
prereleases = git_config_get_value_multi("versionsort.prereleasesuffix");
}
if (prereleases && swap_prereleases(p1 - 1, p2 - 1, &diff))
return diff;
state = result_type[state * 3 + (((c2 == '0') + (isdigit (c2) != 0)))];
switch (state) {