core.prefersymlinkrefs: use symlinks for .git/HEAD
[git/git.git] / diff.h
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #ifndef DIFF_H
5 #define DIFF_H
6
7 #include "tree-walk.h"
8
9 struct diff_options;
10
11 typedef void (*change_fn_t)(struct diff_options *options,
12 unsigned old_mode, unsigned new_mode,
13 const unsigned char *old_sha1,
14 const unsigned char *new_sha1,
15 const char *base, const char *path);
16
17 typedef void (*add_remove_fn_t)(struct diff_options *options,
18 int addremove, unsigned mode,
19 const unsigned char *sha1,
20 const char *base, const char *path);
21
22 struct diff_options {
23 const char *filter;
24 const char *orderfile;
25 const char *pickaxe;
26 unsigned recursive:1,
27 with_raw:1,
28 with_stat:1,
29 tree_in_recursive:1,
30 full_index:1;
31 int break_opt;
32 int detect_rename;
33 int find_copies_harder;
34 int line_termination;
35 int output_format;
36 int pickaxe_opts;
37 int rename_score;
38 int reverse_diff;
39 int rename_limit;
40 int setup;
41 int abbrev;
42
43 int nr_paths;
44 const char **paths;
45 int *pathlens;
46 change_fn_t change;
47 add_remove_fn_t add_remove;
48 };
49
50 extern void diff_tree_setup_paths(const char **paths, struct diff_options *);
51 extern void diff_tree_release_paths(struct diff_options *);
52 extern int diff_tree(struct tree_desc *t1, struct tree_desc *t2,
53 const char *base, struct diff_options *opt);
54 extern int diff_tree_sha1(const unsigned char *old, const unsigned char *new,
55 const char *base, struct diff_options *opt);
56
57 struct combine_diff_path {
58 struct combine_diff_path *next;
59 int len;
60 char *path;
61 unsigned int mode;
62 unsigned char sha1[20];
63 struct combine_diff_parent {
64 char status;
65 unsigned int mode;
66 unsigned char sha1[20];
67 } parent[FLEX_ARRAY];
68 };
69 #define combine_diff_path_size(n, l) \
70 (sizeof(struct combine_diff_path) + \
71 sizeof(struct combine_diff_parent) * (n) + (l) + 1)
72
73 extern int show_combined_diff(struct combine_diff_path *elem, int num_parent,
74 int dense, const char *header,
75 struct diff_options *);
76
77 extern const char *diff_tree_combined_merge(const unsigned char *sha1, const char *, int, struct diff_options *opt);
78
79 extern void diff_addremove(struct diff_options *,
80 int addremove,
81 unsigned mode,
82 const unsigned char *sha1,
83 const char *base,
84 const char *path);
85
86 extern void diff_change(struct diff_options *,
87 unsigned mode1, unsigned mode2,
88 const unsigned char *sha1,
89 const unsigned char *sha2,
90 const char *base, const char *path);
91
92 extern void diff_unmerge(struct diff_options *,
93 const char *path);
94
95 extern int diff_scoreopt_parse(const char *opt);
96
97 #define DIFF_SETUP_REVERSE 1
98 #define DIFF_SETUP_USE_CACHE 2
99 #define DIFF_SETUP_USE_SIZE_CACHE 4
100
101 extern int git_diff_config(const char *var, const char *value);
102 extern void diff_setup(struct diff_options *);
103 extern int diff_opt_parse(struct diff_options *, const char **, int);
104 extern int diff_setup_done(struct diff_options *);
105
106 #define DIFF_DETECT_RENAME 1
107 #define DIFF_DETECT_COPY 2
108
109 #define DIFF_PICKAXE_ALL 1
110 #define DIFF_PICKAXE_REGEX 2
111
112 extern void diffcore_std(struct diff_options *);
113
114 extern void diffcore_std_no_resolve(struct diff_options *);
115
116 #define COMMON_DIFF_OPTIONS_HELP \
117 "\ncommon diff options:\n" \
118 " -z output diff-raw with lines terminated with NUL.\n" \
119 " -p output patch format.\n" \
120 " -u synonym for -p.\n" \
121 " --patch-with-raw\n" \
122 " output both a patch and the diff-raw format.\n" \
123 " --stat show diffstat instead of patch.\n" \
124 " --patch-with-stat\n" \
125 " output a patch and prepend its diffstat.\n" \
126 " --name-only show only names of changed files.\n" \
127 " --name-status show names and status of changed files.\n" \
128 " --full-index show full object name on index lines.\n" \
129 " --abbrev=<n> abbreviate object names in diff-tree header and diff-raw.\n" \
130 " -R swap input file pairs.\n" \
131 " -B detect complete rewrites.\n" \
132 " -M detect renames.\n" \
133 " -C detect copies.\n" \
134 " --find-copies-harder\n" \
135 " try unchanged files as candidate for copy detection.\n" \
136 " -l<n> limit rename attempts up to <n> paths.\n" \
137 " -O<file> reorder diffs according to the <file>.\n" \
138 " -S<string> find filepair whose only one side contains the string.\n" \
139 " --pickaxe-all\n" \
140 " show all files diff when -S is used and hit is found.\n"
141
142 extern int diff_queue_is_empty(void);
143
144 #define DIFF_FORMAT_RAW 1
145 #define DIFF_FORMAT_PATCH 2
146 #define DIFF_FORMAT_NO_OUTPUT 3
147 #define DIFF_FORMAT_NAME 4
148 #define DIFF_FORMAT_NAME_STATUS 5
149 #define DIFF_FORMAT_DIFFSTAT 6
150
151 extern void diff_flush(struct diff_options*);
152
153 /* diff-raw status letters */
154 #define DIFF_STATUS_ADDED 'A'
155 #define DIFF_STATUS_COPIED 'C'
156 #define DIFF_STATUS_DELETED 'D'
157 #define DIFF_STATUS_MODIFIED 'M'
158 #define DIFF_STATUS_RENAMED 'R'
159 #define DIFF_STATUS_TYPE_CHANGED 'T'
160 #define DIFF_STATUS_UNKNOWN 'X'
161 #define DIFF_STATUS_UNMERGED 'U'
162
163 /* these are not diff-raw status letters proper, but used by
164 * diffcore-filter insn to specify additional restrictions.
165 */
166 #define DIFF_STATUS_FILTER_AON '*'
167 #define DIFF_STATUS_FILTER_BROKEN 'B'
168
169 extern const char *diff_unique_abbrev(const unsigned char *, int);
170
171 #endif /* DIFF_H */