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[git/git.git] / diffcore.h
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1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
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4#ifndef DIFFCORE_H
5#define DIFFCORE_H
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6
7/* This header file is internal between diff.c and its diff transformers
8 * (e.g. diffcore-rename, diffcore-pickaxe). Never include this header
9 * in anything else.
10 */
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11
12/* We internally use unsigned short as the score value,
13 * and rely on an int capable to hold 32-bits. -B can take
14 * -Bmerge_score/break_score format and the two scores are
15 * passed around in one int (high 16-bit for merge and low 16-bit
16 * for break).
17 */
ee3d299e 18#define MAX_SCORE 60000.0
f345b0a0 19#define DEFAULT_RENAME_SCORE 30000 /* rename/copy similarity minimum (50%) */
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20#define DEFAULT_BREAK_SCORE 30000 /* minimum for break to happen (50%) */
21#define DEFAULT_MERGE_SCORE 36000 /* maximum for break-merge to happen 60%) */
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22
23#define MINIMUM_BREAK_SIZE 400 /* do not break a file smaller than this */
427dcb4b 24
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25struct diff_filespec {
26 unsigned char sha1[20];
27 char *path;
28 void *data;
c06c7966 29 void *cnt_data;
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30 unsigned long size;
31 int xfrm_flags; /* for use by the xfrm */
32 unsigned short mode; /* file mode */
33 unsigned sha1_valid : 1; /* if true, use sha1 and trust mode;
34 * if false, use the name and read from
35 * the filesystem.
36 */
dc7090ef 37#define DIFF_FILE_VALID(spec) (((spec)->mode) != 0)
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38 unsigned should_free : 1; /* data should be free()'ed */
39 unsigned should_munmap : 1; /* data should be munmap()'ed */
706098af 40 unsigned is_binary : 1; /* data should be considered "binary" */
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41};
42
43extern struct diff_filespec *alloc_filespec(const char *);
44extern void fill_filespec(struct diff_filespec *, const unsigned char *,
45 unsigned short);
46
f0c6b2a2 47extern int diff_populate_filespec(struct diff_filespec *, int);
19397b45 48extern void diff_free_filespec_data(struct diff_filespec *);
427dcb4b 49
52e95789 50struct diff_filepair {
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51 struct diff_filespec *one;
52 struct diff_filespec *two;
01c4e70f 53 unsigned short int score;
15d061b4 54 char status; /* M C R N D U (see Documentation/diff-format.txt) */
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55 unsigned source_stays : 1; /* all of R/C are copies */
56 unsigned broken_pair : 1;
ef677686 57 unsigned renamed_pair : 1;
e9c84099 58 unsigned is_unmerged : 1;
427dcb4b 59};
e9c84099 60#define DIFF_PAIR_UNMERGED(p) ((p)->is_unmerged)
427dcb4b 61
ef677686 62#define DIFF_PAIR_RENAME(p) ((p)->renamed_pair)
01c4e70f 63
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64#define DIFF_PAIR_BROKEN(p) \
65 ( (!DIFF_FILE_VALID((p)->one) != !DIFF_FILE_VALID((p)->two)) && \
66 ((p)->broken_pair != 0) )
67
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68#define DIFF_PAIR_TYPE_CHANGED(p) \
69 ((S_IFMT & (p)->one->mode) != (S_IFMT & (p)->two->mode))
70
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71#define DIFF_PAIR_MODE_CHANGED(p) ((p)->one->mode != (p)->two->mode)
72
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73extern void diff_free_filepair(struct diff_filepair *);
74
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75extern int diff_unmodified_pair(struct diff_filepair *);
76
427dcb4b 77struct diff_queue_struct {
52e95789 78 struct diff_filepair **queue;
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79 int alloc;
80 int nr;
81};
82
38c6f780 83extern struct diff_queue_struct diff_queued_diff;
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84extern struct diff_filepair *diff_queue(struct diff_queue_struct *,
85 struct diff_filespec *,
86 struct diff_filespec *);
6b14d7fa 87extern void diff_q(struct diff_queue_struct *, struct diff_filepair *);
f7c1512a 88
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89extern void diffcore_pathspec(const char **pathspec);
90extern void diffcore_break(int);
8082d8d3 91extern void diffcore_rename(struct diff_options *);
eeaa4603 92extern void diffcore_merge_broken(void);
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93extern void diffcore_pickaxe(const char *needle, int opts);
94extern void diffcore_order(const char *orderfile);
95
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96#define DIFF_DEBUG 0
97#if DIFF_DEBUG
98void diff_debug_filespec(struct diff_filespec *, int, const char *);
99void diff_debug_filepair(const struct diff_filepair *, int);
100void diff_debug_queue(const char *, struct diff_queue_struct *);
101#else
102#define diff_debug_filespec(a,b,c) do {} while(0)
103#define diff_debug_filepair(a,b) do {} while(0)
104#define diff_debug_queue(a,b) do {} while(0)
105#endif
106
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107extern int diffcore_count_changes(struct diff_filespec *src,
108 struct diff_filespec *dst,
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109 void **src_count_p,
110 void **dst_count_p,
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111 unsigned long delta_limit,
112 unsigned long *src_copied,
113 unsigned long *literal_added);
114
427dcb4b 115#endif