[PATCH] Add --pickaxe-all to diff-* brothers.
[git/git.git] / diffcore-pickaxe.c
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1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4#include "cache.h"
5#include "diff.h"
6#include "diffcore.h"
7#include "delta.h"
8
9static int contains(struct diff_filespec *one,
10 const char *needle, unsigned long len)
11{
12 unsigned long offset, sz;
13 const char *data;
14 if (diff_populate_filespec(one))
15 return 0;
16 sz = one->size;
17 data = one->data;
18 for (offset = 0; offset + len <= sz; offset++)
19 if (!strncmp(needle, data + offset, len))
20 return 1;
21 return 0;
22}
23
367cec1c 24void diffcore_pickaxe(const char *needle, int opts)
52e95789 25{
38c6f780 26 struct diff_queue_struct *q = &diff_queued_diff;
52e95789 27 unsigned long len = strlen(needle);
367cec1c 28 int i, has_changes;
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29 struct diff_queue_struct outq;
30 outq.queue = NULL;
31 outq.nr = outq.alloc = 0;
32
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33 if (opts & DIFF_PICKAXE_ALL) {
34 /* Showing the whole changeset if needle exists */
35 for (i = has_changes = 0; !has_changes && i < q->nr; i++) {
36 struct diff_filepair *p = q->queue[i];
37 if (!DIFF_FILE_VALID(p->one)) {
38 if (!DIFF_FILE_VALID(p->two))
39 continue; /* ignore unmerged */
40 /* created */
41 if (contains(p->two, needle, len))
42 has_changes++;
43 }
44 else if (!DIFF_FILE_VALID(p->two)) {
45 if (contains(p->one, needle, len))
46 has_changes++;
47 }
48 else if (!diff_unmodified_pair(p) &&
49 contains(p->one, needle, len) !=
50 contains(p->two, needle, len))
51 has_changes++;
52e95789 52 }
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53 if (has_changes)
54 return; /* not munge the queue */
55
56 /* otherwise we will clear the whole queue
57 * by copying the empty outq at the end of this
58 * function, but first clear the current entries
59 * in the queue.
60 */
61 for (i = 0; i < q->nr; i++)
62 diff_free_filepair(q->queue[i]);
63 }
64 else
65 /* Showing only the filepairs that has the needle */
66 for (i = 0; i < q->nr; i++) {
67 struct diff_filepair *p = q->queue[i];
68 has_changes = 0;
69 if (!DIFF_FILE_VALID(p->one)) {
70 if (!DIFF_FILE_VALID(p->two))
71 ; /* ignore unmerged */
72 /* created */
73 else if (contains(p->two, needle, len))
74 has_changes = 1;
75 }
76 else if (!DIFF_FILE_VALID(p->two)) {
77 if (contains(p->one, needle, len))
78 has_changes = 1;
79 }
80 else if (!diff_unmodified_pair(p) &&
81 contains(p->one, needle, len) !=
82 contains(p->two, needle, len))
83 has_changes = 1;
84
85 if (has_changes)
6b14d7fa 86 diff_q(&outq, p);
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87 else
88 diff_free_filepair(p);
52e95789 89 }
367cec1c 90
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91 free(q->queue);
92 *q = outq;
93 return;
94}