Split out "exact content match" phase of rename detection
[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;
e0e324a4 30 const char *funcname_pattern_ident;
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31 unsigned long size;
32 int xfrm_flags; /* for use by the xfrm */
33 unsigned short mode; /* file mode */
34 unsigned sha1_valid : 1; /* if true, use sha1 and trust mode;
35 * if false, use the name and read from
36 * the filesystem.
37 */
dc7090ef 38#define DIFF_FILE_VALID(spec) (((spec)->mode) != 0)
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39 unsigned should_free : 1; /* data should be free()'ed */
40 unsigned should_munmap : 1; /* data should be munmap()'ed */
29a3eefd 41 unsigned checked_attr : 1;
706098af 42 unsigned is_binary : 1; /* data should be considered "binary" */
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43};
44
45extern struct diff_filespec *alloc_filespec(const char *);
46extern void fill_filespec(struct diff_filespec *, const unsigned char *,
47 unsigned short);
48
f0c6b2a2 49extern int diff_populate_filespec(struct diff_filespec *, int);
19397b45 50extern void diff_free_filespec_data(struct diff_filespec *);
8ae92e63 51extern void diff_free_filespec_blob(struct diff_filespec *);
29a3eefd 52extern int diff_filespec_is_binary(struct diff_filespec *);
427dcb4b 53
52e95789 54struct diff_filepair {
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55 struct diff_filespec *one;
56 struct diff_filespec *two;
01c4e70f 57 unsigned short int score;
15d061b4 58 char status; /* M C R N D U (see Documentation/diff-format.txt) */
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59 unsigned source_stays : 1; /* all of R/C are copies */
60 unsigned broken_pair : 1;
ef677686 61 unsigned renamed_pair : 1;
e9c84099 62 unsigned is_unmerged : 1;
427dcb4b 63};
e9c84099 64#define DIFF_PAIR_UNMERGED(p) ((p)->is_unmerged)
427dcb4b 65
ef677686 66#define DIFF_PAIR_RENAME(p) ((p)->renamed_pair)
01c4e70f 67
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68#define DIFF_PAIR_BROKEN(p) \
69 ( (!DIFF_FILE_VALID((p)->one) != !DIFF_FILE_VALID((p)->two)) && \
70 ((p)->broken_pair != 0) )
71
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72#define DIFF_PAIR_TYPE_CHANGED(p) \
73 ((S_IFMT & (p)->one->mode) != (S_IFMT & (p)->two->mode))
74
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75#define DIFF_PAIR_MODE_CHANGED(p) ((p)->one->mode != (p)->two->mode)
76
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77extern void diff_free_filepair(struct diff_filepair *);
78
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79extern int diff_unmodified_pair(struct diff_filepair *);
80
427dcb4b 81struct diff_queue_struct {
52e95789 82 struct diff_filepair **queue;
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83 int alloc;
84 int nr;
85};
86
38c6f780 87extern struct diff_queue_struct diff_queued_diff;
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88extern struct diff_filepair *diff_queue(struct diff_queue_struct *,
89 struct diff_filespec *,
90 struct diff_filespec *);
6b14d7fa 91extern void diff_q(struct diff_queue_struct *, struct diff_filepair *);
f7c1512a 92
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93extern void diffcore_pathspec(const char **pathspec);
94extern void diffcore_break(int);
8082d8d3 95extern void diffcore_rename(struct diff_options *);
eeaa4603 96extern void diffcore_merge_broken(void);
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97extern void diffcore_pickaxe(const char *needle, int opts);
98extern void diffcore_order(const char *orderfile);
99
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100#define DIFF_DEBUG 0
101#if DIFF_DEBUG
102void diff_debug_filespec(struct diff_filespec *, int, const char *);
103void diff_debug_filepair(const struct diff_filepair *, int);
104void diff_debug_queue(const char *, struct diff_queue_struct *);
105#else
106#define diff_debug_filespec(a,b,c) do {} while(0)
107#define diff_debug_filepair(a,b) do {} while(0)
108#define diff_debug_queue(a,b) do {} while(0)
109#endif
110
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111extern int diffcore_count_changes(struct diff_filespec *src,
112 struct diff_filespec *dst,
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113 void **src_count_p,
114 void **dst_count_p,
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115 unsigned long delta_limit,
116 unsigned long *src_copied,
117 unsigned long *literal_added);
118
427dcb4b 119#endif