aboutsummaryrefslogtreecommitdiff
path: root/diffcore-order.c
blob: 69d41f7a5781a10e43cf0e74f20be85a0d1fc5be (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/*
 * Copyright (C) 2005 Junio C Hamano
 */
#include "cache.h"
#include "diff.h"
#include "diffcore.h"

static char **order;
static int order_cnt;

static void prepare_order(const char *orderfile)
{
	int cnt, pass;
	struct strbuf sb = STRBUF_INIT;
	void *map;
	char *cp, *endp;
	ssize_t sz;

	if (order)
		return;

	sz = strbuf_read_file(&sb, orderfile, 0);
	if (sz < 0)
		die_errno(_("failed to read orderfile '%s'"), orderfile);
	map = strbuf_detach(&sb, NULL);
	endp = (char *) map + sz;

	for (pass = 0; pass < 2; pass++) {
		cnt = 0;
		cp = map;
		while (cp < endp) {
			char *ep;
			for (ep = cp; ep < endp && *ep != '\n'; ep++)
				;
			/* cp to ep has one line */
			if (*cp == '\n' || *cp == '#')
				; /* comment */
			else if (pass == 0)
				cnt++;
			else {
				if (*ep == '\n') {
					*ep = 0;
					order[cnt] = cp;
				} else {
					order[cnt] = xmemdupz(cp, ep - cp);
				}
				cnt++;
			}
			if (ep < endp)
				ep++;
			cp = ep;
		}
		if (pass == 0) {
			order_cnt = cnt;
			ALLOC_ARRAY(order, cnt);
		}
	}
}

static int match_order(const char *path)
{
	int i;
	static struct strbuf p = STRBUF_INIT;

	for (i = 0; i < order_cnt; i++) {
		strbuf_reset(&p);
		strbuf_addstr(&p, path);
		while (p.buf[0]) {
			char *cp;
			if (!wildmatch(order[i], p.buf, 0, NULL))
				return i;
			cp = strrchr(p.buf, '/');
			if (!cp)
				break;
			*cp = 0;
		}
	}
	return order_cnt;
}

static int compare_objs_order(const void *a_, const void *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 obj_order *o;
	int i;

	if (!q->nr)
		return;

	ALLOC_ARRAY(o, q->nr);
	for (i = 0; i < q->nr; i++)
		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;
}